A review on persulfates activation by functional biochar for organic contaminants removal: Synthesis, characterizations, radical determination, and mechanism. Issue 5 (October 2021)

• Record Type: Journal Article
• Authors: Wang, Chongqing; Huang, Rong; Sun, Ruirui; Yang, Jiapeng; Sillanpää, Mika
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 5(2021)
• Publication Date: 2021-10
• Subjects: ROPs refractory organic pollutants -- AOPs advanced oxidation processes -- PS-AOPs persulfates-based advanced oxidation processes -- PSs persulfates (peroxymonosulfate and peroxydisulfate) -- PMS peroxymonosulfate -- PDS peroxydisulfate -- OCGs oxygen-containing groups -- PFRs persistent free radicals -- BBMs biochar-based materials -- ZVI zero valent iron -- FTIR Fourier transform infrared spectroscopy -- XRD X-ray diffractometer -- TEM transmission electron microscope -- SEM scanning electron microscope -- XPS X-ray photoelectron spectroscopy -- EDS energy dispersive spectrum -- EIS electrochemical impedance spectroscopy -- CV cyclic voltammetry -- BET Brunauer–Emmett–Teller -- SPM scanning probe microscopy -- STM scanning tunneling microscopy -- AFM atomic force microscopy -- NMR nuclear magnetic resonance -- SRT synchrotron radiation techniques -- EPR electron paramagnetic resonance -- ESR electron spin resonance -- MeOH methanol -- EtOH ethanol -- TBA tert-butanol alcohol -- FFA furfuryl alcohol -- BQ benzoquinone -- CF chloroform -- DMPO 5, 5-dimethyl-1-pyrroline N-oxide -- TEMP 2, 2, 6, 6-tetramethylpiperidine -- TEMP 2, 2, 6, 6-tetramethylpiperidin -- DPBF 1, 3-diphenylisobenzofuran -- BMPO 5-tert-butoxycarbonyl-5-methyl-1-pyrroline-N-oxide -- ROS reactive oxygen species; Biochar -- Persulfates -- Refractory organic pollutants -- Radical determination -- Non-radical pathway; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.106267
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: In recent years, refractory organic pollutants (ROPs) have been progressively detected in wastewater. Persulfates (peroxymonosulfate and peroxydisulfate)-based advanced oxidation processes (PS-AOPs) are efficient for ROPs degradation. Biochar and its composites, which have the dual advantages of adsorption and catalysis, have been widely used in PS-AOPs. Research advances on PS activation by biochar-based materials are systematically summarized, including biochar modifications, characterizations, radical determinations, and catalytic mechanism. Biochar modifications applied to PS-AOPs are introduced involving morphology regulation, heteroatomic doping, and metals loading. Characterization techniques are described to reveal the physicochemical properties of biochar-based catalysts. Various methods for radical determinations are discussed. The catalytic mechanism in the PS-AOPs is depicted from the point of radical pathway and non-radical pathway. Based on current knowledge, the perspectives and challenges that may be encountered in basic research and practical applications are put forward. This review offers novel insights into catalyst design and better understanding of PS-AOPs. Graphical Abstract: ga1 Highlights: Persulfates-based advanced oxidation processes were reviewed to for ROPs removal. Heteroatomic doping and metals loading are promising to improve catalytic ability of biochar. Catalytic mechanism was discussed from radical pathway and non-radical pathway. The perspectives and challenges for biochar catalyzed PS-AOPs are proposed based on current knowledge.