以偕胺肟纤维(AOCF)为载体,采用配位-沉淀法研制了一种新型的类Fenton催化剂CuO/AOCF.用SEM、EDS和XRD对CuO/AOCF的表面形貌、晶体结构和表面成分进行分析,结果显示:CuO纳米颗粒均匀分布在AOCF表面.以活性红染料为目标降解物及其去除率...以偕胺肟纤维(AOCF)为载体,采用配位-沉淀法研制了一种新型的类Fenton催化剂CuO/AOCF.用SEM、EDS和XRD对CuO/AOCF的表面形貌、晶体结构和表面成分进行分析,结果显示:CuO纳米颗粒均匀分布在AOCF表面.以活性红染料为目标降解物及其去除率为评价指标,考察CuO/AOCF与H_2O_2组成类Fenton催化剂的光催化性能.结果表明:在氙灯光照作用下,0.6 g·L^(-1)CuO/AOCF、2 m L·L^(-1)H_2O_2、反应时间为80 min,活性红溶液几乎完全被降解.对比同质量粉体CuO,CuO/AOCF对光催化性能有着更好的促进作用.CuO/AOCF重复使用5次后降解率仍能大于80%.动力学研究表明,该类Fenton催化降解反应遵循一级反应动力学规律.展开更多
The visible light photo-Fenton-like catalytic performance of BiFeO3 nanoparticles was investigated using Methyl Violet （MV）, Rhodamine B （RhB） and phenol as probes. Under optimum conditions, the pseudo first-order...The visible light photo-Fenton-like catalytic performance of BiFeO3 nanoparticles was investigated using Methyl Violet （MV）, Rhodamine B （RhB） and phenol as probes. Under optimum conditions, the pseudo first-order rate constant （k） was determined to be 2.21 × 10^-2, 5.56 × 10^-2 and 2.01 × 10^-2 min〈 for the degradation of MV （30 μmol/L）, RhB （10 μmol/L） and phenol （3 mmol/L）, respectively, in the BiFeO3-H202-visible light （Vis） system. The introduction of visible light irradiation increased the k values of MV, RhB and phenol degradation 3.47, 1.95 and 2.07 times in comparison with those in dark. Generally, the k values in the BiFeO3- H202-Vis system were accelerated by increasing BiFeO3 load and H202 concentration, but decreased with increasing initial pollutant concentration. To further enhance the degradation of pollutants at high concentrations, BiFeO3 was modified with the addition of surface modifiers. The addition of ethylenediamineteraacetic acid （EDTA, 0.4 mmol/L） increased the k value of MV degradation （60 μmol/L） from 1.01 × 10.2 min^-1 in the BiFeO3-H202-Vis system to 1.30 min^-1 in the EDTA-BiFeO3-H2O2-Vis system by a factor of 128. This suggests that in situ surface modification can enable BiFeO3 nano-particles to be a promising visible light photo-Fenton-like catalyst for the degradation of organic pollutants.展开更多
文摘以偕胺肟纤维(AOCF)为载体,采用配位-沉淀法研制了一种新型的类Fenton催化剂CuO/AOCF.用SEM、EDS和XRD对CuO/AOCF的表面形貌、晶体结构和表面成分进行分析,结果显示:CuO纳米颗粒均匀分布在AOCF表面.以活性红染料为目标降解物及其去除率为评价指标,考察CuO/AOCF与H_2O_2组成类Fenton催化剂的光催化性能.结果表明:在氙灯光照作用下,0.6 g·L^(-1)CuO/AOCF、2 m L·L^(-1)H_2O_2、反应时间为80 min,活性红溶液几乎完全被降解.对比同质量粉体CuO,CuO/AOCF对光催化性能有着更好的促进作用.CuO/AOCF重复使用5次后降解率仍能大于80%.动力学研究表明,该类Fenton催化降解反应遵循一级反应动力学规律.
基金supported by the National Science Foundation of China (No. 21077037,21177044,81030051)
文摘The visible light photo-Fenton-like catalytic performance of BiFeO3 nanoparticles was investigated using Methyl Violet （MV）, Rhodamine B （RhB） and phenol as probes. Under optimum conditions, the pseudo first-order rate constant （k） was determined to be 2.21 × 10^-2, 5.56 × 10^-2 and 2.01 × 10^-2 min〈 for the degradation of MV （30 μmol/L）, RhB （10 μmol/L） and phenol （3 mmol/L）, respectively, in the BiFeO3-H202-visible light （Vis） system. The introduction of visible light irradiation increased the k values of MV, RhB and phenol degradation 3.47, 1.95 and 2.07 times in comparison with those in dark. Generally, the k values in the BiFeO3- H202-Vis system were accelerated by increasing BiFeO3 load and H202 concentration, but decreased with increasing initial pollutant concentration. To further enhance the degradation of pollutants at high concentrations, BiFeO3 was modified with the addition of surface modifiers. The addition of ethylenediamineteraacetic acid （EDTA, 0.4 mmol/L） increased the k value of MV degradation （60 μmol/L） from 1.01 × 10.2 min^-1 in the BiFeO3-H202-Vis system to 1.30 min^-1 in the EDTA-BiFeO3-H2O2-Vis system by a factor of 128. This suggests that in situ surface modification can enable BiFeO3 nano-particles to be a promising visible light photo-Fenton-like catalyst for the degradation of organic pollutants.
