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Efficiency LaFeO3 and BiOI heterojunction for the enhanced photo-Fenton degradation of tetracycline hydrochloride
Applied Surface Science ( IF 6.7 ) Pub Date : 2022-03-19 , DOI: 10.1016/j.apsusc.2022.153081
Zhou Cao , Yunpu Zhao , Zhaohui Zhou , Qizhao Wang , Qiong Mei , Hongfei Cheng

Long-term exposure to antibiotic may have adverse effects on human health including carcinogenesis or teratogenicity and the emergence of antibiotic resistance. Developing effective catalysts to degrade antibiotic pollution is an urgent demand. Herein, a heterogeneous photo-Fenton catalyst with enhanced tetracycline hydrochloride (TCH) degradation activity was developed by hydrothermally synthesizing lanthanum ferrite (LaFeO3) and bismuth iodide oxide (BiOI). LaFeO3/BiOI showed excellent repeatability and stability, and still maintained an extremely high degradation efficiency of 80.6% after three cycles. The LaFeO3/BiOI with 35 wt% LaFeO3 showed significantly enhanced degradation rate (93.6%) of TCH within 40 mins in the photo-Fenton system, compared with single photocatalytic degradation (41.2%) and Fenton degradation (83.1%). The parameter characterization and quenching experiments were carried out on the heterojunction. The possible degradation mechanisms of TCH were proposed. The results indicated that the existence of the built-in electric field in the heterojunction effectively promote the separation of photogenerated electrons and hole pairs. The photoelectrons activate H2O2 to generate radical dotOH and accelerate FeIII/FeII conversion. This work has developed a promising heterogeneous photo-Fenton catalysts, and stipulated some new insights for the removal of antibiotic pollutants.



中文翻译:

高效 LaFeO3 和 BiOI 异质结增强盐酸四环素的光芬顿降解

长期接触抗生素可能对人类健康产生不利影响,包括致癌或致畸以及抗生素耐药性的出现。开发有效的催化剂来降解抗生素污染是当务之急。在此,通过水热合成铁酸镧(LaFeO 3)和碘化铋(BiOI),开发了一种具有增强的盐酸四环素(TCH)降解活性的非均相光芬顿催化剂。LaFeO 3 /BiOI表现出优异的重复性和稳定性,经过3次循环后仍保持80.6%的极高降解效率。LaFeO 3 /BiOI 与 35 wt% LaFeO 3与单次光催化降解(41.2%)和芬顿降解(83.1%)相比,在光-芬顿系统中,40分钟内TCH的降解率显着提高(93.6%)。对异质结进行了参数表征和淬火实验。提出了TCH可能的降解机制。结果表明,异质结中内建电场的存在有效地促进了光生电子和空穴对的分离。光电子激活 H 2 O 2生成激进点OH 并加速 Fe III /Fe II转换。这项工作开发了一种很有前景的非均相光芬顿催化剂,并为去除抗生素污染物提供了一些新的见解。

更新日期:2022-03-19
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