Activation of persulfate by biochar-based catalysts for elimination of refractory organic pollutants: a review

Yongyang Wang

doi:10.54097/mape4r54

Authors

Yongyang Wang

DOI:

https://doi.org/10.54097/mape4r54

Keywords:

Advanced oxidation processes; persulfate; biochar; activation.

Abstract

With the advancement of industrialization and urbanization, refractory organic pollutants (ROPs) have been detected in various types of water environments, leading to increasingly serious environmental problems. Currently, persulfate (PS)-based advanced oxidation processes (PS-AOPs) have received great attention due to their advantages such as short treatment time and high degradation efficiency. Biochar (BC), which comes from a wide range of sources and has significant catalytic activity, has been widely reported in PS activation studies in recent years. In this review, the main reaction pathways and the corresponding reaction mechanisms of ROPs degradation by PS-AOPs were firstly introduced. Then, the influencing factors and regulating means of BC performance in PS activation systems are systematically described, and different modification methods and principles are detailed. Finally, the author analyzes the current difficulties faced and puts forward an outlook on the future research direction. This paper aims to provide a reference for the development of controllable PS activation technology.

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References

Manna, M., & Sen, S. (2023). Advanced oxidation process: a sustainable technology for treating refractory organic compounds present in industrial wastewater. Environ Sci Pollut Res Int, 30(10), 25477-25505. https://doi.org/10.1007/s11356-022-19435-0

Wacławek, S., Lutze, H. V., Grübel, K., Padil, V. V. T., Černík, M., & Dionysiou, D. D. (2017). Chemistry of persulfates in water and wastewater treatment: a review. Chemical Engineering Journal, 330, 44-62. https://doi.org/10.1016/j. cej.2017.07.132

Yuan, X., Guan, R., Wu, Z., Jiang, L., Li, Y., Chen, X., & Zeng, G. (2018). Effective treatment of oily scum via catalytic wet persulfate oxidation process activated by Fe(2). J Environ Manage, 217, 411-415. https://doi.org/10.1016/j.jenvman.2018.03.129

Wang, J., & Wang, S. (2018). Activation of persulfate (PS) and peroxymonosulfate (PMS) and application for the degradation of emerging contaminants. chemical engineering Journal, 334, 1502-1517. https://doi.org/10.1016/j.cej.2017.11.059

Zhao, Y., Yuan, X., Li, X., Jiang, L., & Wang, H. (2021). Burgeoning prospects of biochar and its composite in persulfate-advanced oxidation process. J Hazard Mater, 409, 124893. https://doi.org/10.1016/j .jhazmat.2020.124893

Xie, Y., Wang, L., Li, H., Westholm, L. J., Carvalho, L., Thorin, E., Yu, Z., Yu, X., & Skreiberg, Ø. (2022). A critical review on production, modification and utilization of biochar. Journal of Analytical and Applied Pyrolysis, 161. https://doi.org/10.1016 /j.jaap.2021.105405

M. Ahmad, A.U. Rajapaksha, J.E. Lim, M. Zhang, N. Bolan, D. Mohan, M. Vithanage, S.S. Lee, Y.S. Ok, Biochar as a sorbent for contaminant management in soil and water: a review, Chemosphere 99 (2014) 19-33, https:// doi.org/10.1016/j.chemosphere.2013.10.071.

Wang, B., Li, Y. N., & Wang, L. (2019). Metal-free activation of persulfates by corn stalk biochar for the degradation of antibiotic norfloxacin: Activation factors and degradation mechanism. Chemosphere, 237, 124454. https://doi.org/10.1016/j.chemosphere.2019.124454

Devi, P., Das, U., & Dalai, A. K. (2016). In-situ chemical oxidation: principle and applications of peroxide and persulfate treatments in wastewater systems. sci Total Environ, 571, 643-657. https://doi.org/10.1016/j.scitotenv.2016.07.032

Luo, R., Li, M., Wang, C., Zhang, M., Nasir Khan, M. A., Sun, X., Shen, J., Han, W., Wang, L., & Li, J. (2019). Singlet oxygen-dominated non-radical oxidation process for efficient degradation of bisphenol A under high salinity condition. Water Res, 148, 416- 424. https://doi.org/10.1016/j.watres.2018.10.087

Wang, Y., Gao, C.-Y., Zhang, Y.-Z., Leung, M. K. H., Liu, J.-W., Huang, S.-Z., Liu, G.-L., Li, J.-F., & Zhao, H.-Z. (2021). Bimetal-organic framework derived CoFe/NC porous hybrid nanorods as high-performance persulfate activators for bisphenol a degradation. Chemical Engineering Journal, 421. https://doi.org/10.1016/j.cej.2020.127800

Fanaei, F., Moussavi, G., Srivastava, V., & Sillanpää, M. (2019). The enhanced catalytic potential of sulfur-doped MgO (S-MgO) nanoparticles in activation of peroxysulfates for advanced oxidation of acetaminophen. Chemical Engineering Journal, 371, 404-413. https://doi.org/10.1016/j.cej.2019.04.007

Dong, F.-X., Yan, L., Huang, S.-T., Liang, J.-Y., Zhang, W.-X., Yao, X.-W., Chen, X., Qian, W., Guo, P.-R., Kong, L.-J., Chu, W., & Diao, Z.-H. (2022). Removal of antibiotics sulfadiazine by a biochar based material activated persulfate oxidation system: performance, products and mechanism. process Safety and Environmental Protection, 157, 411-419. https://doi.org/10.1016/j.psep.2021.11.045

Yao, B., Luo, Z., Du, S., Yang, J., Zhi, D., & Zhou, Y. (2022). Magnetic MgFe(2)O(4)/biochar derived from pomelo peel as a persulfate activator for levofloxacin degradation: effects and mechanistic consideration. Bioresour Technol, 346, 126547. https://doi.org/10.1016/j.biortech.2021.126547

Zhang, Y., Sun, X., Bian, W., Peng, J., Wan, H., & Zhao, J. (2020). The key role of persistent free radicals on the surface of hydrochar and pyrocarbon in the removal of heavy metal-organic combined pollutants. Bioresource Technology, 318, 124046. https://doi.org/10.1016/j.biortech.2020.124046

Fang, G., Liu, C., Gao, J., Dionysiou, D. D., & Zhou, D. (2015). Manipulation of Persistent Free Radicals in Biochar To Activate Persulfate for Contaminant Degradation. environmental Science & Technology, 49( 9), 5645-5653. https://doi.org/10.1021/es5061512

Zhang, Y., Xu, M., Liang, S., Feng, Z., & Zhao, J. (2021). Mechanism of persulfate activation by biochar for the catalytic degradation of antibiotics: Synergistic effects of environmentally persistent free radicals and the defective structure of biochar. Sci Total Environ, 794, 148707. https://doi.org/10.1016/j.scitotenv.2021.148707

Ghauch, A., Tuqan, A. M., & Kibbi, N. (2015). Naproxen abatement by thermally activated persulfate in aqueous systems. Chemical Engineering Journal, 279, 861-873. https://doi.org/10.1016/j. cej.2015.05.067

Wang, Y., Song, Y., Li, N., Liu, W., Yan, B., Yu, Y., Liang, L., Chen, G., Hou, L., & Wang, S. (2022). Tunable active sites on biogas digestate derived biochar for sulfanilamide degradation by peroxymonosulfate activation. J Hazard Mater, 421, 126794. https://doi.org/10.1016/j.jhazmat.2021.126794

Zhu, K., Wang, X., Chen, D., Ren, W., Lin, H., & Zhang, H. (2019). Wood-based biochar as an excellent activator of peroxydisulfate for Acid Orange 7 decolorization. chemosphere, 231, 32-40. https://doi.org/10.1016 /j.chemosphere.2019.05.087

Feng, M., Qu, R., Zhang, X., Sun, P., Sui, Y., Wang, L., & Wang, Z. (2015). Degradation of flumequine in aqueous solution by persulfate activated with common methods and polyhydroquinone-coated magnetite/multi-walled carbon nanotubes catalysts. Water Res, 85, 1-10. https://doi.org/10.1016/j.watres.2015.08.011

Lee, J., von Gunten, U., & Kim, J. H. (2020). Persulfate-Based Advanced Oxidation: Critical Assessment of Opportunities and Roadblocks. Environ Sci Technol, 54(6), 3064-3081. https://doi.org Environ Sci Technol. 54(6), 3064-3081. /10.1021/acs.est.9b07082

Guo, Y., Yan, L., Li, X., Yan, T., Song, W., Hou, T., Tong, C., Mu, J., & Xu, M. (2021). Goethite/biochar-activated peroxymonosulfate enhances tetracycline degradation: Inherent roles of radical and non-radical processes. Sci Total Environ, 783, 147102. https://doi.org/10.1016/j.scitotenv.2021.147102

Liu, B., Guo, W., Wang, H., Si, Q., Zhao, Q., Luo, H., & Ren, N. (2020). Activation of peroxymonosulfate by cobalt-impregnated biochar for atrazine degradation: the pivotal roles of persistent free radicals and ecotoxicity assessment. J Hazard Mater, 398, 122768. https://doi.org/10.1016/j.jhazmat.2020.122768

Wang, J., Wang, C., Guo, H., Ye, T., Liu, Y., Cheng, X., Li, W., Yang, B., & Du, E. (2020). Crucial roles of oxygen and superoxide radical in bisulfite-activated persulfate oxidation of bisphenol AF: Mechanisms, kinetics and DFT studies. j Hazard Mater, 391, 122228. https://doi.org/10.1016/j.jhazmat.2020.122228

Kohantorabi, M., Moussavi, G., & Giannakis, S. (2021). A review of the innovations in metal- and carbon-based catalysts explored for heterogeneous peroxymonosulfate (PMS) activation, with focus on radical vs. non-radical degradation pathways of organic contaminants. Chemical Engineering Journal, 411. https://doi.org/10.1016/j.cej.2020.127957

Liu, C., Chen, L., Ding, D., & Cai, T. (2019). From rice straw to magnetically recoverable nitrogen doped biochar: Efficient activation of peroxymonosulfate for the degradation of metolachlor. Applied Catalysis B: Environmental, 254, 312-320. https://doi.org/10.1016/j.apcatb.2019.05.014

Xie, Y., Hu, W., Wang, X., Tong, W., Li, P., Zhou, H., Wang, Y., & Zhang, Y. (2020). Molten salt induced nitrogen-doped biochar nanosheets as highly efficient peroxymonosulfate catalyst for organic pollutant degradation. Environ Pollut, 260, 114053. https://doi.org/10.1016/j.envpol.2020.114053

Li, D., Duan, X., Sun, H., Kang, J., Zhang, H., Tade, M. O., & Wang, S. (2017). Facile synthesis of nitrogen-doped graphene via low-temperature pyrolysis: the effects of precursors and annealing ambience on metal-free catalytic oxidation. carbon, 115, 649-658. https://doi.org/10.1016/j.carbon.2017.01.058

Wang, B., Li, Y. N., & Wang, L. (2019). Metal-free activation of persulfates by corn stalk biochar for the degradation of antibiotic norfloxacin: Activation factors and degradation mechanism. Chemosphere, 237, 124454. https://doi.org/10.1016/j.chemosphere.2019.124454

Zhang, Y., Xu, M., He, R., Zhao, J., Kang, W., & Lv, J. (2022). Effect of pyrolysis temperature on the activated permonosulfate degradation of antibiotics in nitrogen and sulfur-doping biochar: Key role of environmentally persistent free radicals. Chemosphere, 294, 133737. https://doi.org/10.1016/j.chemosphere.2022.133737

Wang, J., Shen, M., Wang, H., Du, Y., Zhou, X., Liao, Z., Wang, H., & Chen, Z. (2020). Red mud modified sludge biochar for the activation of peroxymonosulfate: Singlet oxygen dominated mechanism and toxicity prediction. Sci Total Environ, 740, 140388. https://doi.org/10.1016/j.scitotenv.2020.140388

Zhang, X., Yang, Z., Cui, X., Liu, W., Zou, B., & Liao, W. (2022). Cobalt/calcium bimetallic oxides based on bio-waste eggshells for the efficient degradation of norfloxacin by peroxymonosulfate activation. J Colloid Interface Sci, 621, 1-11. https://doi.org/10.1016/j.jcis.2022.03.121

Jiang, Z.-R., Li, Y., Zhou, Y.-X., Liu, X., Wang, C., Lan, Y., & Li, Y. (2022). Co3O4-MnO2 nanoparticles moored on biochar as a catalyst for activation of peroxymonosulfate to efficiently degrade sulfonamide antibiotics. Separation and Purification Technology, 281. https://doi.org/10.1016/j.seppur.2021.119935

Hu, Y., Chen, D., Zhang, R., Ding, Y., Ren, Z., Fu, M., Cao, X., & Zeng, G. (2021). Singlet oxygen-dominated activation of peroxymonosulfate by passion fruit shell derived biochar for catalytic degradation of tetracycline through a non-radical oxidation pathway. J Hazard Mater, 419, 126495. https://doi.org/10.1016/j.jhazmat.2021.126495

Dong, F.-X., Yan, L., Huang, S.-T., Liang, J.-Y., Zhang, W.-X., Yao, X.-W., Chen, X., Qian, W., Guo, P.-R., Kong, L.-J., Chu, W., & Diao, Z.-H. (2022). Removal of antibiotics sulfadiazine by a biochar based material activated persulfate oxidation system: performance, products and mechanism. process Safety and Environmental Protection, 157, 411-419. https://doi.org/10.1016/j.psep.2021.11.045

Sun, F., Chen, T., Liu, H., Zou, X., Zhai, P., Chu, Z., Shu, D., Wang, H., & Chen, D. (2021). The pH-dependent degradation of sulfadiazine using natural siderite activating PDS: The role of singlet oxygen. Sci Total Environ, 784, 147117. https. //doi.org/10.1016/j.scitotenv.2021.147117

Ioannidi, A., Oulego, P., Collado, S., Petala, A., Arniella, V., Frontistis, Z., Angelopoulos, G. N., Diaz, M., & Mantzavinos, D. (2020). Persulfate activation by modified red mud for the oxidation of antibiotic sulfamethoxazole in water. J Environ Manage, 270, 110820. https://doi.org/ 10.1016/j.jenvman.2020.110820

Wang, S., & Wang, J. (2021). Nitrogen doping sludge-derived biochar to activate peroxymonosulfate for degradation of sulfamethoxazole: Modulation of degradation mechanism by calcination temperature. J Hazard Mater, 418, 126309. https://doi.org/10.1016/j.jhazmat.2021.126309

Fu, H., Zhao, P., Xu, S., Cheng, G., Li, Z., Li, Y., Li, K., & Ma, S. (2019). Fabrication of Fe3O4 and graphitized porous biochar composites for activating peroxymonosulfate to degrade p-hydroxybenzoic acid: Insights on the mechanism. Chemical Engineering Journal, 375. https://doi.org/10.1016/j.cej.2019.121980

Yu, J., Tang, L., Pang, Y., Zeng, G., Wang, J., Deng, Y., Liu, Y., Feng, H., Chen, S., & Ren, X. (2019). Magnetic nitrogen-doped sludge-derived biochar catalysts for persulfate activation: internal electron transfer mechanism. chemical Engineering Journal, 364, 146-159. https://doi.org/10.1016/j.cej.2019.01.163

Qi, Y., Ge, B., Zhang, Y., Jiang, B., Wang, C., Akram, M., & Xu, X. (2020). Three-dimensional porous graphene-like biochar derived from Enteromorpha as a persulfate activator for sulfamethoxazole degradation: role of graphitic N and radicals transformation. Journal of Hazardous Materials, 399. https://doi.org/10.1016/j.jhazmat.2020.123039

Duan, P., Liu, W., Lei, J., Sun, Z., & Hu, X. (2020). Electrochemical mineralization of antibiotic ceftazidime with SnO2-Al2O3/CNT anode: Enhanced performance by peroxydisulfate/Fenton activation and degradation pathway. Journal of Environmental Chemical Engineering, 8(4). https://doi.org/10.1016/j.jece.2020.103812

Song, G., Qin, F., Yu, J., Tang, L., Pang, Y., Zhang, C., Wang, J., & Deng, L. (2022). Tailoring biochar for persulfate-based environmental catalysis: Impact of biomass feedstocks. Journal of Hazardous Materials, 424(Pt D), 127663. https://doi.org/10.1016/j.jhazmat.2021.127663

Han, L., Ro, K. S., Wang, Y., Sun, K., Sun, H., Libra, J. A., & Xing, B. (2018). Oxidation resistance of biochars as a function of feedstock and pyrolysis condition. Sci Total Environ, 616-617, 335-344. https://doi.org/10.1016/j .scitotenv.2017.11.014

Hung, C. M., Chen, C. W., Huang, C. P., Shiung Lam, S., & Dong, C. D. (2022). Peroxymonosulfate activation by a metal-free biochar for sulfonamide antibiotic removal in water and associated bacterial community composition. Bioresour Technol, 343, 126082. https://doi.org/10.1016/j.biortech.2021.126082

Zeng, S., Li, K., Xu, X., Zhang, J., & Xue, Y. (2023). Efficiently catalytic degradation of tetracycline via persulfate activation with plant-based biochars: Insight into endogenous mineral self- template effect and pyrolysis catalysis. Chemosphere, 337, 139309. https://doi.org/10.1016/j.chemosphere.2023.139309

Zhang, K., Min, X., Zhang, T., Xie, M., Si, M., Chai, L., & Shi, Y. (2021). Selenium and nitrogen co-doped biochar as a new metal-free catalyst for adsorption of phenol and activation of peroxymonosulfate: Elucidating the enhanced catalytic performance and stability. Journal of Hazardous Materials, 413, 125294. https://doi.org/10.1016/j.jhazmat.2021.125294

Wan, Z., Sun, Y., Tsang, D. C. W., Khan, E., Yip, A. C. K., Ng, Y. H., Rinklebe, J., & Ok, Y. S. (2020). Customized fabrication of nitrogen-doped biochar for environmental and energy applications. Chemical Engineering Journal, 401. https://doi.org/ 10.1016/j.cej.2020.12

Wang, M., Xu, H., Li, Q., Zhou, G., Ye, Q., Wang, Q., & Zhang, J. (2021). Panda manure biochar-based green catalyst to remove organic pollutants by activating peroxymonosulfate: Important role of non-free radical pathways. . Journal of Environmental Chemical Engineering, 9(6). https://doi.org/10.1016/j.jece.2021.106485

Chen, Y. D., Wang, R., Duan, X., Wang, S., Ren, N. Q., & Ho, S. H. (2020). Production, properties, and catalytic applications of sludge derived biochar for environmental remediation. Water Res, 187, 116390. https://doi. Water Res, 187, 116390. . org/10.1016/j.watres.2020.116390

Li, L., Ai, J., Zhang, W., Peng, S., Dong, T., Deng, Y., Cui, Y., & Wang, D. (2020). Relationship between the physicochemical properties of sludge-based carbons and the adsorption capacity of dissolved organic matter in advanced wastewater treatment: effects of chemical conditioning. Chemosphere, 243, 125333. https://doi.org/10.1016/j.chemosphere.2019.125333

Wu, W., Zhu, S., Huang, X., Wei, W., & Ni, B. J. (2021). Mechanisms of persulfate activation on biochar derived from two different sludges: dominance of their intrinsic compositions. j Hazard Mater, 408, 124454. https://doi.org/10.1016/j.jhazmat.2020.124454

Zhao, B., & Zhang, J. (2022). Tetracycline Degradation by Peroxydisulfate Activated by Waste Pulp/Paper Mill Sludge Biochars Derived at Different Pyrolysis Temperature. water,. 14(10). https://doi.org/10.3390/w14101583

Zhao, Y., Dai, H., Ji, J., Yuan, X., Li, X., Jiang, L., & Wang, H. (2022). Resource utilization of luffa sponge to produce biochar for effective degradation of organic contaminants through persulfate activation. Separation and Purification Technology, 288. https://doi.org/10.1016/j.seppur.2022.120650

[56] He, J., Xiao, Y., Tang, J., Chen, H., & Sun, H. (2019). Persulfate activation with sawdust biochar in aqueous solution by enhanced electron donor-transfer effect. Sci Total Environ, 690, 768-777. https:// doi.org/10.1016/j.scitotenv.2019.07.043

Huang, R., Feng, T., Wu, S., Zhang, X., Fan, Z., Yu, Q., Chen, Y., & Chen, T. (2023). In-situ synthesis of magnetic iron-chitosan-derived biochar as an efficient persulfate activator for phenol degradation. Environ Res, 234, 116604. https://doi.org/10.1016/j.envres.2023.116604

Nguyen, T.-H. A., & Oh, S.-Y. (2021). Oxidation of phenol by persulfate activated by zero-valent iron-biochar composites. Chemical Engineering Communications, 209(11), 1542-1552. https://doi.org/10.1080/00986445.2021.1983546

Al-Shamsi, M. A., & Thomson, N. R. (2013). Treatment of Organic Compounds by Activated Persulfate Using Nanoscale Zerovalent Iron. Industrial & Engineering Chemistry Research, 52(38),. 13564-13571. https://doi.org/10.1021/ie400387p

Shan, A., Idrees, A., Zaman, W. Q., Abbas, Z., Ali, M., Rehman, M. S. U., Hussain, S., Danish, M., Gu, X., & Lyu, S. (2021). Synthesis of nZVI-Ni@BC composite as a stable catalyst to activate persulfate: Trichloroethylene degradation and insight mechanism. Journal of Environmental Chemical Engineering, 9(1). https://doi.org/10.1016/j.jece.2020.104808

Zhan, J., Zheng, T., Piringer, G., Day, C., McPherson, G. L., Lu, Y., Papadopoulos, K., & John, V. T. (2008). Transport Characteristics of Nanoscale Functional Zerovalent Iron/Silica Composites for in Situ Remediation of Trichloroethylene. Environmental Science & Technology, 42(23), 8871-8876. https://doi.org/10.1021/es800387p

Jiang, Z., Li, J., Jiang, D., Gao, Y., Chen, Y., Wang, W., Cao, B., Tao, Y., Wang, L., & Zhang, Y. (2020). Removal of atrazine by biochar-supported zero-valent iron catalyzed persulfate oxidation: Reactivity, radical production and transformation pathway. Environ Res, 184, 109260. https://doi.org/10.1016/j.envres.2020.109260

Hussain, I., Li, M., Zhang, Y., Li, Y., Huang, S., Du, X., Liu, G., Hayat, W., & Anwar, N. (2017). Insights into the mechanism of persulfate activation with nZVI/BC nanocomposite for the degradation of nonylphenol. Chemical Engineering Journal,. 311, 163-172. https://doi.org/10.1016/j.cej.2016.11.085

Guo, J., Jiang, J., Chen, Y., Wen, X., Chen, W., Wang, Y., Su, L., & Cao, J. (2022). Synthesis of nZVI-BC composite for persulfate activation to degrade pyrene: Performance, correlative mechanisms and degradation pathways. process Safety and Environmental Protection, 162, 733-745. https://doi.org/10.1016/j.psep.2022.04.051

Li, S., Wu, Y., Zheng, Y., Jing, T., Tian, J., Zheng, H., Wang, N., Nan, J., & Ma, J. (2021). Free-radical and surface electron transfer dominated bisphenol A degradation in system of ozone and peroxydisulfate co-activated by CoFe2O4-biochar . Applied Surface Science, 541. https://doi.org/10.1016/j.apsusc.2020.147887

Zhang, W., Feng, S., Ma, J., Zhu, F., & Komarneni, S. (2022). Degradation of tetracycline by activating persulfate using biochar-based CuFe(2)O(4) composite. Environ Sci Pollut Res Int, 29(44), 67003-67013. https://doi.org/10.1007/s11356-022-20500-x

Singh, S., Kumar, V., Dhanjal, D. S., Datta, S., Bhatia, D., Dhiman, J., Samuel, J., Prasad, R., & Singh, J. (2020). A sustainable paradigm of sewage sludge biochar: Valorization, opportunities, challenges and future prospects. Journal of Cleaner Production, 269. https://doi.org/10.1016/j.jclepro.2020.122259

Wang, L., Ok, Y. S., Tsang, D. C. W., Alessi, D. S., Rinklebe, J., Wang, H., Mašek, O., Hou, R., O'Connor, D., Hou, D., & Nicholson, F. (2020). New trends in biochar pyrolysis and modification strategies: feedstock, pyrolysis conditions, sustainability concerns and implications for soil amendment. Soil Use and Management, 36(3), 358-386. https://doi.org/10.1111/sum.12592

Melia, P. M., Busquets, R., Hooda, P. S., Cundy, A. B., & Sohi, S. P. (2019). Driving forces and barriers in the removal of phosphorus from water using crop residue, wood and sewage sludge derived biochars. sci Total Environ, 675,. 623-631. https://doi.org/10.1016/j.scitotenv.2019.04.232

Fan, X., Zhang, W., Liu, Y., Shi, S., Cui, Y., Zhao, Z., & Hou, J. (2023). Hydrothermal synthesis of sewage sludge biochar for activation of persulfate for antibiotic removal: Efficiency, stability and mechanism. Environ. Res, 218, 114937. https://doi.org/10.1016/j.envres.2022.114937

Kim, D.-G., & Ko, S.-O. (2020). Effects of thermal modification of a biochar on persulfate activation and mechanisms of catalytic degradation of a pharmaceutical. chemical Engineering Journal, 399. https://doi.org/10.1016/j.cej.2020.125377

Mendonca, F. G., Cunha, I. T. D., Soares, R. R., Tristao, J. C., & Lago, R. M. (2017). Tuning the surface properties of biochar by thermal treatment. Bioresour Technol, 246, 28-33. https://doi.org/10.1016/j.biortech.2017.07.099

Miao, X., Chen, X., Wu, W., Lin, D., & Yang, K. (2022). Intrinsic defects enhanced biochar/peroxydisulfate oxidation capacity through electron-transfer regime. Chemical Engineering Journal, 438. https://doi.org/10.1016/j.cej.2022.135606

Peng, P., Lang, Y.-H., & Wang, X.-M. (2016). Adsorption behavior and mechanism of pentachlorophenol on reed biochars: pH effect, pyrolysis temperature, hydrochloric acid treatment and isotherms. Ecological Engineering, 90, 225-233. https://doi.org/10.1016/j.ecoleng.2016.01.039

Li, L. Y., Gong, X., & Abida, O. (2019). Waste-to-resources: exploratory surface modification of sludge-based activated carbon by nitric acid for heavy metal adsorption. waste Manag, 87,. 375-386. https://doi.org/10.1016/j.wasman.2019.02.019

Chen, M., Wang, F., Zhang, D.-l., Yi, W.-m., & Liu, Y. (2021). Effects of acid modification on the structure and adsorption NH4+-N properties of biochar. Renewable Energy, 169, 1343-1350. https://doi.org/ 10.1016/j.renene.2021.01.098

Yu, J., Tang, L., Pang, Y., Zeng, G., Wang, J., Deng, Y., Liu, Y., Feng, H., Chen, S., & Ren, X. (2019). Magnetic nitrogen-doped sludge-derived biochar catalysts for persulfate activation: internal electron transfer mechanism. chemical Engineering Journal, 364, 146-159. https://doi.org/10.1016/j.cej.2019.01.163

Ma, Z., Cheng, Z., Yang, Y., Nie, C., Wu, D., Yang, T., Wang, S., & Li, D. (2023). Acid-modified anaerobic biogas residue biochar activates persulfate for phenol degradation: enhancement of the efficiency and non-radical pathway. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 663. https://doi.org/10.1016/j.colsurfa.2023.131121

Wang, H., Guo, W., Yin, R., Du, J., Wu, Q., Luo, H., Liu, B., Sseguya, F., & Ren, N. (2019). Biochar-induced Fe(III) reduction for persulfate activation in sulfamethoxazole degradation: insight into the electron transfer, radical oxidation and degradation pathways. Chemical Engineering Journal, 362, 561-569. https://doi.org/10.1016/j.cej.2019.01.053

Zhang, J., Shao, J., Jin, Q., Li, Z., Zhang, X., Chen, Y., Zhang, S., & Chen, H. (2019). Sludge-based biochar activation to enhance Pb(II) adsorption. fuel, 252, 101-108. https://doi.org/10.1016/j.fuel.2019.04.096

Wang, C., Wang, H., & Cao, Y. (2018). Pb(II) sorption by biochar derived from Cinnamomum camphora and its improvement with ultrasound-assisted alkali activation. colloids and Surfaces A. Physicochemical and Engineering Aspects, 556, 177-184. https://doi.org/10.1016/j.colsurfa.2018.08.036

Wan, Z., Sun, Y., Tsang, D. C. W., Khan, E., Yip, A. C. K., Ng, Y. H., Rinklebe, J., & Ok, Y. S. (2020). Customized fabrication of nitrogen-doped biochar for environmental and energy applications. Chemical Engineering Journal, 401. https://doi.org/ 10.1016/j.cej.2020.126136

Yao, D., Vlessidis, A. G., Gou, Y., Zhou, X., Zhou, Y., & Evmiridis, N. P. (2004). Chemiluminescence detection of superoxide anion release and superoxide dismutase activity: modulation effect of Pulsatilla chinensis. Anal Bioanal Chem, 379(1), 171-177. https://doi.org/10.1007/s00216-004-2527-z

Mian, M. M., & Liu, G. (2020). Activation of peroxymonosulfate by chemically modified sludge biochar for the removal of organic pollutants: understanding the role of active sites Chemical Engineering Journal, 392. https://doi.org/10.1016/j.cej.2019.123681

Luo, H., Fu, H., Yin, H., & Lin, Q. (2022). Carbon materials in persulfate-based advanced oxidation processes: the roles and construction of active sites. J Hazard Mater, 426, 128044. https:// doi.org/10.1016/j.jhazmat.2021.128044

Annamalai, S., & Shin, W. S. (2022). Efficient degradation of trimethoprim with ball-milled nitrogen-doped biochar catalyst via persulfate activation. Chemical Engineering Journal,. 440. https://doi.org/10.1016/j.cej.2022.135815

Wang, H., Guo, W., Liu, B., Wu, Q., Luo, H., Zhao, Q., Si, Q., Sseguya, F., & Ren, N. (2019). Edge-nitrogenated biochar for efficient peroxydisulfate activation: an electron transfer mechanism. Water Research, 160, 405-414. https://doi. org/10.1016/j.watres.2019.05.059

Li, C., Xu, B., Jin, M., Chen, L., Yi, G., Chen, L., Wu, Y., Zhang, Y., & Xing, B. (2023). Sulfur and nitrogen co-doped biochar activated persulfate to degrade phenolic wastewater: Changes in impedance. Journal of Molecular Structure, 1294 . https://doi.org/10.1016/j.molstruc.2023.136344

Guo, D., Shibuya, R., Akiba, C., Saji, S., Kondo, T., & Nakamura, J. (2016). Active sites of nitrogen-doped carbon materials for oxygen reduction reaction clarified using model catalysts. science, 351(6271), 361-365. https:/ /doi.org/doi:10.1126/science.aad0832