摘要
畜禽养殖业污染已成为农业水体污染中的主要来源,其中四环素是畜禽粪便排泄的主要抗生素。该研究在室温下采用超声原位法成功制备ZIF-8/g-C_(3)N_(4)复合光催化剂用于去除水体中盐酸四环素。实验结果表明,相较于纯ZIF-8的光吸收范围,ZIF-8/g-C_(3)N_(4)复合光催化剂的最大吸光范围为470 nm,显著提升,并且其禁带宽也明显减小至2.79 e V。ZIF-8/g-C_(3)N_(4)复合光催化剂在投加量为500 mg/L时,50 mg/L的盐酸四环素在光照条件下90 min后的去除率达到78.5%,其相较于纯g-C_(3)N_(4)光催化剂对盐酸四环素的去除率提高了29个百分点。结合自由基捕获和ESR表征结果可知,该研究中空穴对盐酸四环素的降解起主要作用。3次循环实验表明,复合光催化剂具有良好的稳定性。
ZIF-8/g-C_(3)N_(4)heterojunction composites were prepared using ultrasound in situ method at room temperature.The photodegradation efficiency of tetracycline hydrochloride(TC)under simulated visible light was evaluated as well.The results indicate that ZIF-8/g-C_(3)N_(4)exhibit improved photodegradation efficiency compared to the bare ZIF-8 and bare g-C_(3)N_(4).The experimental results showed that the maximum light absorption range of ZIF-8/g-C_(3)N_(4)composite photocatalyst was 470 nm,which was significantly improved compared with that of bare ZIF-8.The energy bandgap of the composite photocatalyst was significantly reduced to 2.79 eV.The ZG-2 composite was highly effective for the removal of TC at the concentration of 50 mg/L for 90 min under illumination.The removal rate of TC at a concentration of 50 mg/L and the ZG-2 dosage of 500 mg/L reached 78.5%,which was 29 percentage points higher than that of g-C_(3)N_(4),respectively.The combination of free radical capture and ESR experiments revealed that the main active radical that played a role in the removal of TC was h^(+).The 3-cycle experiments showed that the ZG-2 composite photocatalyst had good stability.
作者
帅政
万星雨
张艺臻
何貟
张顺喜
申文娟
李慧
SHUAI Zheng;WAN Xingyu;ZHANG Yizhen;HE Yun;ZHANG Shunxi;SHEN Wenjuan;LI Hui(Hubei International Science and Technology Coorperation Centre for the Utilization of Agricutural Waste Resources,School of Chemical and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China;College Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao 266000,China)
出处
《环境科学与技术》
CSCD
北大核心
2024年第S2期152-159,共8页
Environmental Science & Technology
基金
湖北省自然科学基金面上项目(2023AFB938)
