The degradation of organic pollutants in water is a critical environmental challenge.The iron-doped MoS_(2) catalysts have demonstrated potential in activating peroxymonosulfate(PMS)for environmental remediation,but t...The degradation of organic pollutants in water is a critical environmental challenge.The iron-doped MoS_(2) catalysts have demonstrated potential in activating peroxymonosulfate(PMS)for environmental remediation,but they face challenges such as poor conductivity,limited electron transfer efficiency,and a scarcity of active sites.To address these issues,we successfully synthesized a nano-flowers FeS/MoS_(2) composite derived from polyoxometalates(NH_(4))_(3)[Fe(III)Mo_(6)O_(24)H_(6)]⋅6H_(2)O(denoted as FeMo6)as the bimetallic precursors.This synthesis strategy enhances the interaction between FeS and MoS_(2),thereby facilitating electron transfer.Notably,the introduction of sulfur vacancies in FeS/MoS_(2) exposes additional Mo4t active sites,promoting the redox cycle of Fe^(2+)/Fe^(3+) and accelerating the regeneration of Fe^(2+),which in turn enhances PMS activation.Therefore,a catalytic oxidation system of FeS/MoS_(2)/PMS is presented that primarily relies on SO_(4)^(⋅-)and⋅OH,with ^(1)O_(2) as a supplementary oxidant.This system exhibits exceptional degradation efficiency for p-chlorophenol(4-CP),achieving 100% degradation within 10 min over a wide pH range of 2.4–8.4.The robust performance and wide applicability of FeS/MoS_(2) catalyst make it a promising candidate in advanced oxidation processes(AOPs)for environmental remediation.展开更多
This paper provides evidence for the degradation of organic pollutant by the photo-Fenton complex mechanism. Both the complex oxidation and HO. oxidation mechanisms were verified by p-chlorophenol degradation, UV/Vis ...This paper provides evidence for the degradation of organic pollutant by the photo-Fenton complex mechanism. Both the complex oxidation and HO. oxidation mechanisms were verified by p-chlorophenol degradation, UV/Vis spectra anaylsis, and quantum yield. The hydroxyl radical involved in the photo-Fenton process can also be generated from the decomposition of H2O2, photolysis of Fe^3＋ and degradation of hydrated Fe（Ⅵ）-complex, excepting the traditional Fenton reaction.展开更多
A phenol-degrading microorganism, Rhodococcus sp.RSP8, was used to study the substrate interactions during cell growth on phenol and p-chlorophenol dual substrates. Both phenol and p-chlorophenol could be utilized by ...A phenol-degrading microorganism, Rhodococcus sp.RSP8, was used to study the substrate interactions during cell growth on phenol and p-chlorophenol dual substrates. Both phenol and p-chlorophenol could be utilized by the bacteria as the sole carbon and energy sources. When cells grew on the mixture of phenol and p-chlorophenol, strong substrate interactions were observed. The p-chlorophenol inhibited the degradation of phenol, on the other hand, phenol also inhibited the utilization of p-chlorophenol. The overall cell growth rate depends on the co-actions of phenol and p-chlorophenol. In addition, the cell growth and substrate degradation kinetics of phenol, p-chlorophenol as single and mixed substrates for Rhodococcus sp.RSP8 in batch cultures were also investigated over a wide range of initial phenol concentrations (5-1600 mg.L–1) and initial p-chlorophenol concentrations (5 – 250 mg.L–1). The single-substrate kinetics was described well using the Haldane-type kinetic models, with model constants of μm1 = 0.15 h–1, KS1 = 2.22 mg.L–1 and Ki1 = 245.37 mg.L–1 for cell growth on phenol and of μm2 = 0.0782 h–1, KS2 = 1.30 mg.L–1 and Ki2 = 71.77 mg.L–1, K′i2 = 5480 (mg.L–1)2 for cell growth on p-chlorophenol. Proposed cell growth kinetic model was used to characterize the substrates interactions in the dual substrates system.展开更多
Study on the effects of sonolysis, ozonolysis and US/O3 system on the decomposition of p-chlorophenol in aqueous solutions indicated that in the cases of US/O3 system, individual ozonolysis and sonolysis, the decompos...Study on the effects of sonolysis, ozonolysis and US/O3 system on the decomposition of p-chlorophenol in aqueous solutions indicated that in the cases of US/O3 system, individual ozonolysis and sonolysis, the decomposition rate of p-chlorophenol reached 78.78%, 56.20%, 2.79% after a 16-min reaction while its CODcr (chemical oxygen demand) removal rate was 97.02%, 62.17%, 3.67% after a 120-min reaction. The decomposition reaction of p-chlorophenol follows pseudo-first-order kinetics. The enhancement factors of p-chlorophenol and its CODcr under US/O3 system reached 63% and 237% respectively. The main intermediates during the decomposition include catechol, hydroquinone, p-benzoquinone, phenol, fumaric acid, maleic acid, oxalic acid and formic acid. The decomposition mechanism of p-chlorophenol was also discussed.展开更多
基金financially supported by the National Natural Science Foundation of China(52063024 and 51868052)the Natural Science Foundation of Jiangxi Province(20192ACBL21046)the National Science Foundation of State Key Laboratory of Structural Chemistry(20160013).
文摘The degradation of organic pollutants in water is a critical environmental challenge.The iron-doped MoS_(2) catalysts have demonstrated potential in activating peroxymonosulfate(PMS)for environmental remediation,but they face challenges such as poor conductivity,limited electron transfer efficiency,and a scarcity of active sites.To address these issues,we successfully synthesized a nano-flowers FeS/MoS_(2) composite derived from polyoxometalates(NH_(4))_(3)[Fe(III)Mo_(6)O_(24)H_(6)]⋅6H_(2)O(denoted as FeMo6)as the bimetallic precursors.This synthesis strategy enhances the interaction between FeS and MoS_(2),thereby facilitating electron transfer.Notably,the introduction of sulfur vacancies in FeS/MoS_(2) exposes additional Mo4t active sites,promoting the redox cycle of Fe^(2+)/Fe^(3+) and accelerating the regeneration of Fe^(2+),which in turn enhances PMS activation.Therefore,a catalytic oxidation system of FeS/MoS_(2)/PMS is presented that primarily relies on SO_(4)^(⋅-)and⋅OH,with ^(1)O_(2) as a supplementary oxidant.This system exhibits exceptional degradation efficiency for p-chlorophenol(4-CP),achieving 100% degradation within 10 min over a wide pH range of 2.4–8.4.The robust performance and wide applicability of FeS/MoS_(2) catalyst make it a promising candidate in advanced oxidation processes(AOPs)for environmental remediation.
文摘This paper provides evidence for the degradation of organic pollutant by the photo-Fenton complex mechanism. Both the complex oxidation and HO. oxidation mechanisms were verified by p-chlorophenol degradation, UV/Vis spectra anaylsis, and quantum yield. The hydroxyl radical involved in the photo-Fenton process can also be generated from the decomposition of H2O2, photolysis of Fe^3＋ and degradation of hydrated Fe（Ⅵ）-complex, excepting the traditional Fenton reaction.
文摘A phenol-degrading microorganism, Rhodococcus sp.RSP8, was used to study the substrate interactions during cell growth on phenol and p-chlorophenol dual substrates. Both phenol and p-chlorophenol could be utilized by the bacteria as the sole carbon and energy sources. When cells grew on the mixture of phenol and p-chlorophenol, strong substrate interactions were observed. The p-chlorophenol inhibited the degradation of phenol, on the other hand, phenol also inhibited the utilization of p-chlorophenol. The overall cell growth rate depends on the co-actions of phenol and p-chlorophenol. In addition, the cell growth and substrate degradation kinetics of phenol, p-chlorophenol as single and mixed substrates for Rhodococcus sp.RSP8 in batch cultures were also investigated over a wide range of initial phenol concentrations (5-1600 mg.L–1) and initial p-chlorophenol concentrations (5 – 250 mg.L–1). The single-substrate kinetics was described well using the Haldane-type kinetic models, with model constants of μm1 = 0.15 h–1, KS1 = 2.22 mg.L–1 and Ki1 = 245.37 mg.L–1 for cell growth on phenol and of μm2 = 0.0782 h–1, KS2 = 1.30 mg.L–1 and Ki2 = 71.77 mg.L–1, K′i2 = 5480 (mg.L–1)2 for cell growth on p-chlorophenol. Proposed cell growth kinetic model was used to characterize the substrates interactions in the dual substrates system.
文摘Study on the effects of sonolysis, ozonolysis and US/O3 system on the decomposition of p-chlorophenol in aqueous solutions indicated that in the cases of US/O3 system, individual ozonolysis and sonolysis, the decomposition rate of p-chlorophenol reached 78.78%, 56.20%, 2.79% after a 16-min reaction while its CODcr (chemical oxygen demand) removal rate was 97.02%, 62.17%, 3.67% after a 120-min reaction. The decomposition reaction of p-chlorophenol follows pseudo-first-order kinetics. The enhancement factors of p-chlorophenol and its CODcr under US/O3 system reached 63% and 237% respectively. The main intermediates during the decomposition include catechol, hydroquinone, p-benzoquinone, phenol, fumaric acid, maleic acid, oxalic acid and formic acid. The decomposition mechanism of p-chlorophenol was also discussed.
