College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
College of Environment and Ecology, Chongqing University, Chongqing 400044, P. R. China.
Langmuir. 2024 Oct 15;40(41):21499-21513. doi: 10.1021/acs.langmuir.4c02376. Epub 2024 Oct 7.
Overuse of antibiotics can lead to increased bacterial resistance; therefore, there is a need to develop efficient nanomaterials for removing antibiotics from water. NiFe bimetallic hydroxide nanosheets doped with S-Cu were prepared on diatomite (S-CuNiFe LDH@diatomite) by using a two-step hydrothermal method. The surface of CuNiFe LDH@DE has a layered structure with an increased specific surface area and pore volume. The average pore size of S-CuNiFe LDH@De increases from 13.3 to 24.7 nm, and a more stereoscopic channel structure is obtained. Tetracycline removal experiments were performed on CuNiFe LDH@De and S-CuNiFe LDH@De. It was found that CuNiFe LDH@De had excellent photocatalytic performance and S-CuNiFe LDH@De had excellent adsorption performance. After CuNiFe LDH@De had been in contact with tetracycline (TC) for 2 h, the TC removal rate reached 95.6%. After S-CuNiFe LDH@De had been in contact with TC for 1 h, the adsorption capacity of TC was 145.5 mg/g. The pseudo-first-order kinetics and Sips isotherm model can be used to describe the adsorption process more accurately. The response surface method was used to optimize the adsorption conditions. According to the optimized conditions, a better adsorption performance of 166.9 mg/g was obtained. The two prepared materials showed good performance in the removal of tetracycline. This study provides a way to synthesize low-cost adsorbents and photocatalysts, which has value in the treatment of TC wastewater.
抗生素的过度使用会导致细菌耐药性增加；因此，需要开发高效的纳米材料来去除水中的抗生素。采用两步水热法在硅藻土上制备了掺杂 S-Cu 的 NiFe 双金属氢氧化物纳米片（S-CuNiFe LDH@硅藻土）。CuNiFe LDH@DE 的表面具有层状结构，比表面积和孔体积增加。S-CuNiFe LDH@De 的平均孔径从 13.3nm 增加到 24.7nm，得到了更立体的通道结构。在 CuNiFe LDH@De 和 S-CuNiFe LDH@De 上进行了四环素去除实验。结果表明，CuNiFe LDH@De 具有优异的光催化性能，S-CuNiFe LDH@De 具有优异的吸附性能。CuNiFe LDH@De 与四环素（TC）接触 2h 后，TC 去除率达到 95.6%。S-CuNiFe LDH@De 与 TC 接触 1h 后，TC 的吸附量为 145.5mg/g。准一级动力学和 Sips 等温线模型可以更准确地描述吸附过程。采用响应面法优化吸附条件。根据优化条件，得到了更好的吸附性能 166.9mg/g。两种制备的材料在去除四环素方面表现出良好的性能。本研究为合成低成本吸附剂和光催化剂提供了一种方法，在 TC 废水处理方面具有价值。
