Abstract

The present study investigated the application of functinalized adsorbents in the removal of tetracycline in water by adsorption. Activated carbon was impregnated with iron chloride, copper sulfate and hydrogen peroxide, in order to improve its adsorption properties. The solids were characterized by adsorption/desorption isotherms N₂, XRD, FTIR and SEM. The influence of pH, adsorbent concentration and contact time parameters was evaluated. The results using activated carbon as adsorbent and initial TC concentration of 20 mg.L⁻¹ showed that 93% TC removal was achieved at pH 4.0, contact time of 120 minutes and 30 g.L⁻¹ adsorbent concentration. Experiments applying the functionalized solids showed a faster initial adsorption kinetics. Also, no pH adjustment was required (pH 6.0). In addiction, a minimum of 50% reduction in adsorbent mass (15, 10 and 5 g.L⁻¹ for CA–H₂O₂, CA–Fe and CA–Cu, respectively) was observed, compared to the untreated solid. The pseudo-second-order kinetic model was chosen as the optimal model for the study. The application of FeCl₃, CuSO₄ and H₂O₂ composites as adsorbent solids are technically feasible for the removal of tetracycline in wastewater treatment.

摘要

本研究研究了功能化吸附剂在通过吸附去除水中四环素中的应用。活性炭用氯化铁，硫酸铜和过氧化氢浸渍，以提高其吸附性能。通过吸附/解吸等温线N ₂，XRD，FTIR和SEM表征固体。评估了pH，吸附剂浓度和接触时间参数的影响。使用活性炭作为吸附剂和TC初始浓度为20 mg.L ^-1的结果表明，在pH 4.0，接触时间为120分钟和30 gL ^{-1的条件下}，TC的去除率为93％吸附剂浓度。应用官能化固体的实验显示出更快的初始吸附动力学。另外，不需要调节pH（pH 6.0）。与未处理的固体相比，在成瘾过程中，观察到吸附剂质量至少降低了50％（CA–H ₂ O ₂，CA–Fe和CA–Cu分别为15、10和5 gL ^-1）。选择伪二级动力学模型作为研究的最佳模型。FeCl ₃，CuSO ₄和H ₂ O ₂复合材料作为吸附固体的应用在废水处理中去除四环素在技术上是可行的。