Singlet oxygen-dominated peroxydisulfate activation by sludge-derived biochar for sulfamethoxazole degradation through a nonradical oxidation pathway: Performance and mechanism

Yin, Renli; Guo, Wei; Wang, Huazhe; Du, Jing; Wu, Qinglian; Chang, Jo‐Shu; Ren, Nanqi

doi:10.1016/j.cej.2018.09.184

Cited by 424 publications

(63 citation statements)

References 48 publications

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“…In an attempt to evaluate indirectly the role of sulfate and hydroxyl radicals on SMX degradation, experiments were conducted in UPW, adding methanol or t-butanol in excess (i.e., 10 and 100 g/L). Both alcohols act as radical scavengers; methanol reacts with both sulfate and hydroxyl radicals at comparable rates, while t-butanol reacts preferentially with hydroxyl radicals [40,41]. As seen in Figure 13a, SMX degradation is only partly impeded in the presence of methanol, with the rate constant decreasing by about 25% and 40% at 10 and 100 g/L alcohol, respectively.…”

Section: The Role Of Radical Scavengersmentioning

confidence: 92%

Activation of Persulfate by Biochars from Valorized Olive Stones for the Degradation of Sulfamethoxazole

et al. 2019

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Biochars from spent olive stones were tested for the degradation of sulfamethoxazole (SMX) in water matrices. Batch degradation experiments were performed using sodium persulfate (SPS) as the source of radicals in the range 250–1500 mg/L, with biochar as the SPS activator in the range 100–300 mg/L and SMX as the model micro-pollutant in the range 250–2000 μg/L. Ultrapure water (UPW), bottled water (BW), and secondary treated wastewater (WW) were employed as the water matrix. Removal of SMX by adsorption only was moderate and favored at acidic conditions, while SPS alone did not practically oxidize SMX. At these conditions, biochar was capable of activating SPS and, consequently, of degrading SMX, with the pseudo-first order rate increasing with increasing biochar and oxidant concentration and decreasing SMX concentration. Experiments in BW or UPW spiked with various anions showed little or no effect on degradation. Similar experiments in WW resulted in a rate reduction of about 30%, and this was attributed to the competitive consumption of reactive radicals by non-target water constituents. Experiments with methanol and t-butanol at excessive concentrations resulted in partial but generally not complete inhibition of degradation; this indicates that, besides the liquid bulk, reactions may also occur close to or on the biochar surface.

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Section: The Role Of Radical Scavengersmentioning

confidence: 92%

Activation of Persulfate by Biochars from Valorized Olive Stones for the Degradation of Sulfamethoxazole

et al. 2019

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“…[97] The PDS system generated strong ROSs via efficient activation processes such as photolytic, sonolytic, thermal, and transition metal-assisted activation. [82,85] Among all the transition metals that assisted PDS activation, Fe 2+ -assisted activation is considered as the most reliable and efficient methods for homogeneous PDS activation. [98] Nevertheless, various limitations of the above-mentioned techniques have subsequently been reported, such as leaching of toxic metals ion resulting in secondary pollutants' generation, energy intensiveness, and poor steadiness of the materials.…”

Section: Wwwadvsustainsyscommentioning

confidence: 99%

“…Generation of some radicals or nonradical oxidant species by PDS activation may lead to degradation of pollutants by the radical and nonradical AOPs. [85] The general route of PDS activation is assisted by the SO 4…”

Section: Wwwadvsustainsyscommentioning

confidence: 99%

“…[103] Recently, SDBC has been applied by Yin et al for degradation of sulfamethoxazole (SMX) via the SDBC/PDS system. [85] According to them, SDBC alone can remove up to 16.5% SMX, while 10.1% was eliminated via direct oxidation by PDS alone. When the SDBC/PDS system was applied together, the drastic enhancement in degradation (94.6%) of SMX was observed, which would be due to activation of PDS by SDBC ( Table 1).…”

Section: Wwwadvsustainsyscommentioning

confidence: 99%

“…Yin et al also described that N-doping and Fe-loading into the carbon matrix might form the imperative active sites for degradation of SMX by the graphenelike SDBC material via the PDS system. [85] More importantly, in the SDBC/PDS system, in comparison to the frequently generated SO 4…”

Section: Wwwadvsustainsyscommentioning

confidence: 99%

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Critical Review on Biochar‐Supported Catalysts for Pollutant Degradation and Sustainable Biorefinery

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Hydrothermal and Pyrolytic Conversion of Biomasses into Catalysts for Advanced Oxidation Treatments

Zheng

et al. 2020

Adv Funct Materials

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Biomasses are very important natural products. Transferring biomass into catalysts for the advanced oxidation process (AOP) via heat treatment has attracted extensive attention. This review systematically introduces and summarizes two kinds of innovative biomass‐based catalysts according to the treating temperature. At low temperature (<300 °C), biomasses are converted into hydrothermal carbonation carbon (HTCC) with semiconductive properties for photocatalysis application. At high temperature (>300 °C), by contrast, the products lose their semiconductive nature and become a conductive carbon‐based conductor (biochar). They usually work as AOP catalysts by activating oxidant of O2, H2O2, and peroxysulfate for environmental treatment. This review summarizes and compares HTCC and biochar according to their formation process, structure, catalytic mechanism, and key points for the activity enhancement. The active units in HTCC are the sp2‐hybridized polyfuran unit while those in biochar are the persistent free radicals, nitrogen‐containing unit, or defects. HTCC converts water into OH radicals by using the photoexcited electron/hole pairs induced by solar illumination, while biochar activates oxidants via the active unit on its surface. More importantly, this review summarizes and demonstrates the key points to obtain high‐efficiency HTCC and biochar catalysts. Finally, conclusions are drawn and the future aspects for biomass‐based catalysis are given.

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Singlet oxygen-dominated peroxydisulfate activation by sludge-derived biochar for sulfamethoxazole degradation through a nonradical oxidation pathway: Performance and mechanism

Cited by 424 publications

References 48 publications

Activation of Persulfate by Biochars from Valorized Olive Stones for the Degradation of Sulfamethoxazole

Activation of Persulfate by Biochars from Valorized Olive Stones for the Degradation of Sulfamethoxazole

Critical Review on Biochar‐Supported Catalysts for Pollutant Degradation and Sustainable Biorefinery

Hydrothermal and Pyrolytic Conversion of Biomasses into Catalysts for Advanced Oxidation Treatments

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