【摘要】 采用水热法结合高温热处理制备Ag-Zn₃（VO₄）₂光催化剂,研究催化剂在可见光下降解甲基橙溶液的性能,并考察催化剂用量、甲基橙溶液初始浓度、pH值、盐效应和H₂O₂用量对光催化性能的影响,评价Ag-Zn₃（VO₄）₂光催化剂的重复使用性能。结果表明,在催化剂用量2.0 g·L^-1、甲基橙溶液初始浓度20 mg·L^-1和溶液pH=6.2条件下光照反应5 h,甲基橙溶液脱色率可达99.18%,Na₂SO₄对光催化降解甲基橙起抑制作用,且随着溶液中盐浓度增加,抑制作用更明显。H₂O₂在一定浓度范围可促进光催化降解甲基橙,100 mL甲基橙溶液中30%H₂O₂加入量为1.0 mL时,甲基橙溶液脱色率可提高21.68个百分点。催化剂重复使用5次后,光照5 h的甲基橙溶液脱色率仍可达到75.99%。更多还原

【Abstract】 Ag-doped Zn₃（VO₄）₂ photocatalyst was prepared by hydrothermal method combined with subsequent heat treatment process. The properties of as-prepared photocatalyst for degradation of methyl orange under visible light were studied,and then the influence of catalyst dosage,initial concentrations and p H value of methyl orange solution,Na₂SO₄ concentrations and H₂O₂ amounts was investigated. The repeated use performance of Ag-Zn₃（VO₄）₂photocatalyst was evaluated. The results showed that the degradation rate of methyl orange reached 99. 18% under the optimal condition of catalyst dosage 2. 0 g·L^-1,initial concentrations of methyl orange solution 20 mg·L^-1,pH = 6. 2 and irradiation time 5 h. Addition of Na₂SO₄ inhibited photocatalytic degradation of methyl orange,and the inhibition action strengthened as the salt concentration increased. H₂O₂ accelerated photocatalysis in a certain concentration range,and the degradation rate of methyl orange could be improved by 21. 68 percentage points under the condition of methyl orange solution 100 mL and 30% H₂O₂ amount 1. 0 mL. After five recycling runs,Ag-Zn₃（VO₄）₂photocatalyst still kept 75. 99% removal rate of methyl orange under the irradiation for 5 h.更多还原