生物炭负载ZnO光催化降解盐酸四环素性能

Photocatalytic Degradation of Tetracycline Hydrochloride by Biochar Supported ZnO

实验以不同生物质为原料在500℃下用马弗炉热解制备了一系列生物炭负载型ZnO光催化剂,研究了负载型催化剂通过生物炭吸附与ZnO光催化协同作用对水中盐酸四环素的去除效果。主要探究了不同生物质材料、掺杂比、盐酸四环素的初始浓度以及pH值对去除效果的影响。结果表明:与其他生物质相比,小麦秸秆负载ZnO对盐酸四环素去除效果最佳,去除率可达97.38%;生物质原材料与ZnO的掺杂比为1:1时对盐酸四环素的去除率最高;由于低pH值时H+会腐蚀ZnO且消耗OH?,而高pH值时OH?会与ZnO反应生成羟基配合物,因此pH值为7时去除盐酸四环素效率最高;盐酸四环素的初始浓度对去除率的影响明显,且浓度越高去除效率越低。

A series photocatalysts of biochar supported ZnO were prepared by pyrolysis with different biomass at 500°C in muff furnace. The removal properties of prepared photocatalysts toward tetracycline hydrochloride in water were studied. The effects of biomass type, doping ratio, initial concentration of tetracycline hydrochloride and pH value on the removal rate were investigated. The results showed that compared with other biomass, wheat straw based biochar supported ZnO had the maximum tetracycline hydrochloride removal rate of as high as 97.38%. When the doping ratio of biomass and ZnO was 1:1 in weight, the removal rate of tetracycline hydrochloride reached its maximum. The optimal pH value for the tetracycline hydrochloride removal was 7, which was because of the H+ would corrode ZnO and consume OH? at a low pH value, while the OH? would react with ZnO to form hydroxyl complex at a high pH value. The initial concentration of tetracycline hydrochloride has an obvious effect on the removal rate, and the higher the concentration, the lower the removal rate.