GO-PPy/TiO_(2)复合物的制备及降解废水中的孔雀石绿  

Preparation of GO-PPy/TiO_(2) Compositeand Degradation of Malachite Green in Wastewater

作　　者：李大军[1] 杜倩 贺惠[1] 杨梅先 戈心怡 LI Dajun;DU Qian;HE Hui;YANG Meixian;GE Xinyi(School of Chemistry and Environment Engineering,Hunan Institute of Technology,Hengyang 421002,China)

机构地区：[1]湖南工学院化学与环境工程学院,湖南衡阳421002

出　　处：《水处理技术》2022年第11期88-93,共6页Technology of Water Treatment

基　　金：湖南省教育厅科学研究项目(18C0916);湖南工学院大学生创新创业训练计划项目(CX2022179)。

摘　　要：以多层氧化石墨烯(GO)和吡咯(Py)为前驱物,采用原位聚合法制备了PPy/TiO_(2)复合物,再用水热法制备了不同质量比的GO-PPy/TiO_(2)三元复合物,探究三元复合物对模拟废水中孔雀石绿的吸附-紫外光催化性能,考察了复合物的投加量、废水初始浓度、光照条件、离子形态、溶液初始pH和反应温度等因素对去除率的影响。结果表明:三元复合物比二元复合物具有更强大的吸附和紫外光催化性能,制备GO-PPy/TiO_(2)复合物的最佳质量比为0.6:1:100,对于10 mg/L的孔雀石绿废水,其复合物最佳投加量为0.2 g/500 mL,溶液初始pH最佳为7.0,室温条件下经30 min暗吸附和60 min紫外光催化降解,溶液中孔雀石绿可完全降解;反应温度对复合物吸附量的影响极小,但反应温度的提高有助于提升复合物的紫外光催化性能;复合物的吸附具有一定的离子选择性,但不同离子形态对其紫外光催化性能影响较小;对复合物进行20次循环,孔雀石绿去除率仍可达83.7%;光催化降解机理实验表明三元复合物的紫外光催化降解孔雀石绿过程中主要的活性物种是超氧自由基。PPy/TiO_(2) composites were prepared by in-situ polymerization using multilayer graphene oxide(GO)and pyrrole(Py)as precursors,and then GO-PPy/TiO_(2) ternary composites with different mass ratios were prepared by hydrothermal method.The adsorption UV photocatalytic performance of the ternary composites for malachite green in simulated wastewater was investigated.The effects of the dosage of complex,initial concentration of wastewater,illumination conditions,ionic form,initial pH value of solution and reaction temperature on the removal rate were investigated.The results showed that the ternary complex had more powerful adsorption and UV photocatalysis properties than the binary complex.The optimal mass ratio for preparing GO-PPy/TiO_(2) complex was 0.6:1:100.For 10 mg/L malachite green wastewater,the optimal dosage of the complex was 0.2 g/500 mL,the optimal initial pH of the solution was 7.0,and malachite green in the solution can be completely degraded after 30 min dark adsorption and 60 min UV photocatalysis at room temperature;The effect of reaction temperature on the adsorption capacity of the composite was very small,but the increase of reaction temperature was helpful to improve the UV photocatalytic performance of the composite;The adsorption of the complex had a certain ion selectivity,but different ion forms have little effect on its UV photocatalytic performance;After 20 cycles,the malachite green removal rate was still 83.7%;The photocatalytic degradation mechanism experiment shows that the main active species in the UV photocatalytic degradation of malachite green by ternary complex was superoxide radical.

关 键 词：复合物 孔雀石绿 吸附性能 紫外光催化 

分 类 号：O643.3[理学—物理化学]