ZnFe2O4 nanoparticles （ZFNPs） were developed as catalyst for the degradation of benzotriazole （BTA） by heterogeneous photoelectro- Fenton （PE-Fenton） like process. ZFNPs were prepared by a co-precipitation proce...ZnFe2O4 nanoparticles （ZFNPs） were developed as catalyst for the degradation of benzotriazole （BTA） by heterogeneous photoelectro- Fenton （PE-Fenton） like process. ZFNPs were prepared by a co-precipitation process and then characterized with transmission electron microscopy （TEM）, X-ray fluorescence （XRF）, X-ray diffraction （XRD） and BET surface area. Using such ZFNPs as catalyst, the degradation of BTA was investigated. Due to the high catalytic activity of ZFNPs, PE-Fenton like process showed efficient degradation of BTA. The influencing factors such as pH, dosage of ZFNPs, applied potential and initial concentration of BTA were systematically investigated. Under the optimum conditions, 91.2% of BTA was removed after 180 rain treatment.展开更多
This study has demonstrated an interesting amplification effect of magnetic field (MF) on the hydroxylamine (HA)-promoted zero valent iron (ZVI)/H_(2)O_(2) Fenton-like system. Sulfamethoxazole (SMX) could be efficient...This study has demonstrated an interesting amplification effect of magnetic field (MF) on the hydroxylamine (HA)-promoted zero valent iron (ZVI)/H_(2)O_(2) Fenton-like system. Sulfamethoxazole (SMX) could be efficiently degraded at near neutral pH. Conditional parameters affecting the SMX degradation in the ZVI/H_(2)O_(2)/HA/MF system, e.g., pH and the dosages of ZVI, HA and H_(2)O_(2), were investigated. Unlike the acid-favorable ZVI/H_(2)O_(2) and ZVI/H_(2)O_(2)/HA systems, the MF-assisted system exhibited good performances even at pH up to 6.0 and highest degradation rate at pH of 5.0. ^(·)OH was still identified as the responsible oxidant. A mechanism involving the MF-enhanced heterogeneous-homogeneous iron cycle was proposed in the near-neutral ZVI/H_(2)O_(2)/HA system. Without MF, HA-induced reductive dissolution of the surface iron oxides occurred and thus leaded to homogeneous Fenton reactions. After the introduction of MF, the gradient magnetic field formed on the ZVI particles would induce the generation of concentration cells of Fe(II) and local corrosion of iron. Large amounts of aqueous and bounded Fe(II) catalyzed H_(2)O_(2) to efficiently produce ^(·)OH, while HA maintained the surface and bulk cycles of Fe(II)/Fe(III). The result of study is expected to provide a green, energy-free method in improving the effectiveness of ZVI-based Fenton-like technologies at weak-acidic circumstances.展开更多
In this study,efficient sulfamethoxazole(SMX) degradation was demonstrated in a novel neutral FeredFenton like/oxalate(electro-Fe^2+/PDS/Ox,Fered-FL/Ox) system adopting pre-anodized Ti@Ti02 cathode.Optimization of ope...In this study,efficient sulfamethoxazole(SMX) degradation was demonstrated in a novel neutral FeredFenton like/oxalate(electro-Fe^2+/PDS/Ox,Fered-FL/Ox) system adopting pre-anodized Ti@Ti02 cathode.Optimization of operational parameters was conducted and the whole reaction mechanism based on the critical solid-liquid interfacial reactions was explored.An efficient neutral heterogeneous-homogenous iron cyclewould exist in the Fered-FL/Ox system,depending on the formation of specific C-O-Ti bonds through the inner sphere surface complex(ISSC) of Fe(C2 O4)3^3-.It would induce ultrafast electron transfer from the cathode to the FeⅢ core,effectively accelerating the neutral Fenton-like reactions and complete mineralization of SMX with relative low dosage of ferrous catalyst and applied voltage.The result of this study is expected to supply a good alternative in treating complex neutral industrial wastewaters.展开更多
To develop more efficient chemical methods for the demineralization of organic pollutants from water bodies, which one was also mimic to the nature, a degradation of methylene blue by Fe(Ⅲ) and H 2O 2 in the absenc...To develop more efficient chemical methods for the demineralization of organic pollutants from water bodies, which one was also mimic to the nature, a degradation of methylene blue by Fe(Ⅲ) and H 2O 2 in the absence of light instead of Fe(Ⅱ) and H 2O 2 was studied. Results showed that use of Fe (Ⅲ) is more promising than Fe(Ⅱ). The present study reflects that Fenton reaction is more efficient, in the presence of a small amount of salicylic acid is added which is a one of the priority pollutant.展开更多
A novel iron-glutamate-silicotungstate ternary complex（FeШGluS iW） was synthesized from ferric chloride（FeI II）,glutamic acid（Glu）,and silicotungstic acid（SiW）,and used as a heterogeneous Fenton-like catalyst...A novel iron-glutamate-silicotungstate ternary complex（FeШGluS iW） was synthesized from ferric chloride（FeI II）,glutamic acid（Glu）,and silicotungstic acid（SiW）,and used as a heterogeneous Fenton-like catalyst for 4-chlorophenol（4-CP） degradation at neutral pH value. The prepared FeШGluS iW was characterized using inductively coupled plasma atomic emission spectroscopy,thermogravimetry,Fourier-transform infrared spectroscopy,ultraviolet-visible diffuse reflectance spectroscopy,X-ray diffraction,and field-emission scanning electron microscopy. The results showed that FeШGluS iW has the formula [Fe（C5H8NO4）（H2O）]2SiW 12O40？13H2O,with glutamate moiety and Keggin-structured SiW 12O404- heteropolyanion. The catalyst showed high catalytic activity in 4-CP degradation in the dark and under irradiation. Under the conditions of 4-CP 100 mg/L,FeШGluS iW 1.0 g/L,H2O2 20 mmol/L,and pH = 6.5,4-CP was completely decomposed in 40 min in the dark and in 15 min under irradiation. When the reaction time was prolonged to 2 h,the corresponding total organic carbon removals under dark and irradiated conditions were ca. 27% and 72%,respectively. The high catalytic activity of FeI IIGluS iW is resulted from hydrogen bonding of H2O2 on the FeI IIGluS iW surface. The enhanced degradation of 4-CP under irradiation arises from simultaneous oxidation of 4-CP through Fenton-like and photocatalytic processes respectively catalyzed by ferric iron and the SiW 12O404- hetropolyanion in FeШGluS iW.展开更多
本文以辽河油田沈阳采油厂某采油作业区石油污染土壤为研究对象,探究H2O2浓度、FeSO4浓度、反应体系pH、水土比、反应时间等因素对石油污染土壤中石油烃降解效果的影响。研究结果表明,H2O2投加浓度对石油烃的降解效果影响显著,氧化剂和...本文以辽河油田沈阳采油厂某采油作业区石油污染土壤为研究对象,探究H2O2浓度、FeSO4浓度、反应体系pH、水土比、反应时间等因素对石油污染土壤中石油烃降解效果的影响。研究结果表明,H2O2投加浓度对石油烃的降解效果影响显著,氧化剂和催化剂浓度对Fenton反应过程中石油烃的氧化效果有较大影响,反应体系pH值为6.0时石油烃的去除效果最佳,合理的水土比能够提高氧化效率。不同程度污染土壤的修复效果表明,反应24 h后,Fenton反应基本完成,石油烃去除率分别为49.22%,55.31%和61.98%,该研究结果可为污染土壤环境修复提供科学依据。In this paper, the effects of H2O2 concentration, FeSO4 concentration, reaction system pH, water and soil ratio, and reaction time on the degradation of petroleum hydrocarbons in oil-polluted soil were studied in an oil production area of Shenyang oil production plant of Liaohe Oilfield. The research results show that the concentration of H2O2 has a significant impact on the degradation effect of petroleum hydrocarbons, and the concentration of oxidant and catalyst has a great impact on the oxidation effect of petroleum hydrocarbons in the Fenton reaction process. When the pH value of the reaction system is 6.0, the removal effect of petroleum hydrocarbons is the best, and reasonable water and soil ratio can improve the oxidation efficiency. The remediation effects of contaminated soil of different degrees show that after 24 h of reaction, Fenton reaction is basically completed, and the removal rates of petroleum hydrocarbons are 49.22%, 55.31% and 61.98%, respectively. The research results can provide scientific basis for the remediation of contaminated soil environment.展开更多
基金supported by the National Natural Science Foundation of China (No. 20977037)the Fundamental Research Funds for the Central Universities (No.2011TS062)
文摘ZnFe2O4 nanoparticles （ZFNPs） were developed as catalyst for the degradation of benzotriazole （BTA） by heterogeneous photoelectro- Fenton （PE-Fenton） like process. ZFNPs were prepared by a co-precipitation process and then characterized with transmission electron microscopy （TEM）, X-ray fluorescence （XRF）, X-ray diffraction （XRD） and BET surface area. Using such ZFNPs as catalyst, the degradation of BTA was investigated. Due to the high catalytic activity of ZFNPs, PE-Fenton like process showed efficient degradation of BTA. The influencing factors such as pH, dosage of ZFNPs, applied potential and initial concentration of BTA were systematically investigated. Under the optimum conditions, 91.2% of BTA was removed after 180 rain treatment.
基金supported by the National Natural Science Foundation of China (Nos. 21677055 and 22006045)the China Postdoctory Science Foundation (No. 2020M672361)the Project of Three Gorges Corporation (No. JD-ZC-FW-20-001)。
文摘This study has demonstrated an interesting amplification effect of magnetic field (MF) on the hydroxylamine (HA)-promoted zero valent iron (ZVI)/H_(2)O_(2) Fenton-like system. Sulfamethoxazole (SMX) could be efficiently degraded at near neutral pH. Conditional parameters affecting the SMX degradation in the ZVI/H_(2)O_(2)/HA/MF system, e.g., pH and the dosages of ZVI, HA and H_(2)O_(2), were investigated. Unlike the acid-favorable ZVI/H_(2)O_(2) and ZVI/H_(2)O_(2)/HA systems, the MF-assisted system exhibited good performances even at pH up to 6.0 and highest degradation rate at pH of 5.0. ^(·)OH was still identified as the responsible oxidant. A mechanism involving the MF-enhanced heterogeneous-homogeneous iron cycle was proposed in the near-neutral ZVI/H_(2)O_(2)/HA system. Without MF, HA-induced reductive dissolution of the surface iron oxides occurred and thus leaded to homogeneous Fenton reactions. After the introduction of MF, the gradient magnetic field formed on the ZVI particles would induce the generation of concentration cells of Fe(II) and local corrosion of iron. Large amounts of aqueous and bounded Fe(II) catalyzed H_(2)O_(2) to efficiently produce ^(·)OH, while HA maintained the surface and bulk cycles of Fe(II)/Fe(III). The result of study is expected to provide a green, energy-free method in improving the effectiveness of ZVI-based Fenton-like technologies at weak-acidic circumstances.
基金financially supported by the National Natural Science Foundation of China (Nos.21677055 and 21407052)the Fundamental Research Funds for the Central Universities,HUST (Nos.2017KFXKJC004 and 2016YXMS287)
文摘In this study,efficient sulfamethoxazole(SMX) degradation was demonstrated in a novel neutral FeredFenton like/oxalate(electro-Fe^2+/PDS/Ox,Fered-FL/Ox) system adopting pre-anodized Ti@Ti02 cathode.Optimization of operational parameters was conducted and the whole reaction mechanism based on the critical solid-liquid interfacial reactions was explored.An efficient neutral heterogeneous-homogenous iron cyclewould exist in the Fered-FL/Ox system,depending on the formation of specific C-O-Ti bonds through the inner sphere surface complex(ISSC) of Fe(C2 O4)3^3-.It would induce ultrafast electron transfer from the cathode to the FeⅢ core,effectively accelerating the neutral Fenton-like reactions and complete mineralization of SMX with relative low dosage of ferrous catalyst and applied voltage.The result of this study is expected to supply a good alternative in treating complex neutral industrial wastewaters.
文摘To develop more efficient chemical methods for the demineralization of organic pollutants from water bodies, which one was also mimic to the nature, a degradation of methylene blue by Fe(Ⅲ) and H 2O 2 in the absence of light instead of Fe(Ⅱ) and H 2O 2 was studied. Results showed that use of Fe (Ⅲ) is more promising than Fe(Ⅱ). The present study reflects that Fenton reaction is more efficient, in the presence of a small amount of salicylic acid is added which is a one of the priority pollutant.
基金supported by the National Natural Science Foundation of China(51268001)~~
文摘A novel iron-glutamate-silicotungstate ternary complex（FeШGluS iW） was synthesized from ferric chloride（FeI II）,glutamic acid（Glu）,and silicotungstic acid（SiW）,and used as a heterogeneous Fenton-like catalyst for 4-chlorophenol（4-CP） degradation at neutral pH value. The prepared FeШGluS iW was characterized using inductively coupled plasma atomic emission spectroscopy,thermogravimetry,Fourier-transform infrared spectroscopy,ultraviolet-visible diffuse reflectance spectroscopy,X-ray diffraction,and field-emission scanning electron microscopy. The results showed that FeШGluS iW has the formula [Fe（C5H8NO4）（H2O）]2SiW 12O40？13H2O,with glutamate moiety and Keggin-structured SiW 12O404- heteropolyanion. The catalyst showed high catalytic activity in 4-CP degradation in the dark and under irradiation. Under the conditions of 4-CP 100 mg/L,FeШGluS iW 1.0 g/L,H2O2 20 mmol/L,and pH = 6.5,4-CP was completely decomposed in 40 min in the dark and in 15 min under irradiation. When the reaction time was prolonged to 2 h,the corresponding total organic carbon removals under dark and irradiated conditions were ca. 27% and 72%,respectively. The high catalytic activity of FeI IIGluS iW is resulted from hydrogen bonding of H2O2 on the FeI IIGluS iW surface. The enhanced degradation of 4-CP under irradiation arises from simultaneous oxidation of 4-CP through Fenton-like and photocatalytic processes respectively catalyzed by ferric iron and the SiW 12O404- hetropolyanion in FeШGluS iW.
文摘本文以辽河油田沈阳采油厂某采油作业区石油污染土壤为研究对象,探究H2O2浓度、FeSO4浓度、反应体系pH、水土比、反应时间等因素对石油污染土壤中石油烃降解效果的影响。研究结果表明,H2O2投加浓度对石油烃的降解效果影响显著,氧化剂和催化剂浓度对Fenton反应过程中石油烃的氧化效果有较大影响,反应体系pH值为6.0时石油烃的去除效果最佳,合理的水土比能够提高氧化效率。不同程度污染土壤的修复效果表明,反应24 h后,Fenton反应基本完成,石油烃去除率分别为49.22%,55.31%和61.98%,该研究结果可为污染土壤环境修复提供科学依据。In this paper, the effects of H2O2 concentration, FeSO4 concentration, reaction system pH, water and soil ratio, and reaction time on the degradation of petroleum hydrocarbons in oil-polluted soil were studied in an oil production area of Shenyang oil production plant of Liaohe Oilfield. The research results show that the concentration of H2O2 has a significant impact on the degradation effect of petroleum hydrocarbons, and the concentration of oxidant and catalyst has a great impact on the oxidation effect of petroleum hydrocarbons in the Fenton reaction process. When the pH value of the reaction system is 6.0, the removal effect of petroleum hydrocarbons is the best, and reasonable water and soil ratio can improve the oxidation efficiency. The remediation effects of contaminated soil of different degrees show that after 24 h of reaction, Fenton reaction is basically completed, and the removal rates of petroleum hydrocarbons are 49.22%, 55.31% and 61.98%, respectively. The research results can provide scientific basis for the remediation of contaminated soil environment.
