Abstract

Among all emerging contaminants, pharmaceutical compounds as tetracycline (TC) can cause potential environmental impact in water quality. In this work, the removal of TC drug on activated carbon from aqueous solution was studied and the best operating parameters were obtained. In addition, a real aqueous matrix was enriched with TC and the optimized conditions were applied to study the adsorption process efficiency. For this, the influence of pH, contact time between phases and dosage of adsorbent solid was evaluated. The investigation of kinetics, equilibrium and thermodynamic was also performed. The adsorbent material was characterized by SEM analysis and N₂ adsorption/desorption isotherms to confirm its properties. Batch experiments showed that the most suitable experimental conditions for adsorption in aqueous solution were: pH 4.0, contact time 90 min and dosage of adsorbent solid 30 g.L⁻¹. Under these conditions, it was possible to obtain 92.7% of TC removal with predominance of a spontaneous, favorable and endothermic chemisorption process. Adsorption experiments with real aqueous matrix provided 99.4% TC removal. These results show the potential of adsorption as a wastewater treatment applied to remove emerging pollutants as TC from real aqueous contaminated water.

摘要

在所有新兴污染物中，作为四环素（TC）的药物化合物可能会对水质造成潜在的环境影响。在这项工作中，研究了从水溶液中去除活性炭上TC药物的方法，并获得了最佳操作参数。此外，真实的水性基质中富含TC，并采用优化条件研究了吸附过程的效率。为此，评估了pH，相之间的接触时间和吸附固体的用量的影响。还进行了动力学，平衡和热力学的研究。通过SEM分析和N ₂表征吸附材料吸附/解吸等温线以确认其性质。批量实验表明，最适合在水溶液中吸附的实验条件为：pH 4.0，接触时间90分钟和固体吸附剂剂量30 gL ^-1。在这些条件下，以自发，有利和吸热的化学吸附过程为主，可以获得92.7％的TC去除率。用实际的含水基质进行的吸附实验可去除99.4％的TC。这些结果表明，吸附作为废水处理的潜力具有潜力，可从真实的水污染水中去除新兴污染物，如TC。