CQDs/TiO_(2)复合材料的制备及光催化降解抗生素  

Preparation of CQDs/TiO_(2) composites and photocatalytic degradation of antibiotic wastewater

作　　者：王旭 陈熙[1] 徐新阳[1] 朱晓轩 黄宇 范广建 林冠之 闫佳丽 易有为 李文骞 WANG Xu;CHEN Xi;XU Xinyang;ZHU Xiaoxuan;HUANG Yu;FAN Guangjian;LIN Guanzhi;YAN Jiali;YI Youwei;LI Wenqian(School of Resource and Civil Engineering,Northeastern University,Shenyang,110819,China)

机构地区：[1]东北大学资源与土木工程学院,沈阳110819

出　　处：《环境化学》2022年第12期3876-3885,共10页Environmental Chemistry

基　　金：国家重点研发计划课题(2019YFC1803804)资助.

摘　　要：以四异丙醇钛和葡萄糖为原料,制备全新的CQDs/TiO_(2)复合材料并用于降解四环素废水.使用XRD、XPS、TEM、HR-TEM、BET、FT-IR、UV-vis DRS等方法进行表征,探究了在不同掺杂量、溶液初始浓度、催化剂投加量、pH、光照强度等条件下的降解效果.实验结果表明,在pH=5.6、催化剂投加量1 g·L^(−1)、四环素溶液浓度10 mg·L^(−1),光照120 min后,CQDs/TiO_(2)对四环素的去除率可达93.1%,复合材料大幅度提升了降解效率.通过淬灭实验,发现降解过程主要起作用的活性物种为·OH、·O_(2)^(−),并分析了CQDs/TiO_(2)降解四环素的反应机制.进行5次循环利用实验,降解率仍能达到80%以上,表现出CQDs/TiO_(2)是一种稳定、可循环利用的复合材料.Novel CQDs/TiO_(2) composites were prepared from titanium tetraisopropoxide and glucose and used to degrade tetracycline wastewater.XRD,XPS,TEM,HR-TEM,BET,FT-IR,and UV-vis DRS were used for characterization.The degradation effects were also investigated under different doping amounts,initial concentration of the solution,catalyst dosing,pH,and light intensity.The experimental results showed that the removal rate of tetracycline by CQDs/TiO_(2) could reach 93.1%at pH=5.6,catalyst dosage of 1 g·L^(−1),tetracycline solution concentration of 10 mg·L^(−1),and 120 min of light exposure,and the composite material substantially improved the degradation efficiency.Through quenching experiments,it was found that the main active species acting in the degradation process were·OH and·O_(2)^(−),and the reaction mechanism of CQDs/TiO_(2) in degrading tetracycline was analyzed.Five recycling experiments were carried out and the degradation rate still reached over 80%,demonstrating that CQDs/TiO_(2) is a stable and recyclable composite material.

关 键 词：CQDs/TiO_(2) 光催化 四环素 废水处理 

分 类 号：X703[环境科学与工程—环境工程] TB332[一般工业技术—材料科学与工程] TQ426[化学工程]