Department of Environmental Engineering, Faculty of Engineering, Kocaeli University, 41380, Kocaeli, Turkey E-mail:
Water Sci Technol. 2021 Jan;83(2):396-408. doi: 10.2166/wst.2020.577.
Diclofenac sodium (DCF) is a non-steroidal anti-inflammatory drug. It has been classified as ecotoxic even at low concentrations. In this study, adsorption of DCF on coconut shell-based granular activated carbon (GAC) and regeneration of spent GAC with hydrochloric acid (HCl) were investigated. The results showed that GAC with heterogeneous surface structure adsorbs DCF endothermically with both chemical and physical forces. Adsorption and regeneration processes were optimized with Taguchi Experimental Design. The effects of all parameters affecting the adsorption and regeneration processes were determined by analysis of variance and Pareto analyses. DCF removal of 79.80% was obtained at optimum conditions and the most effective parameter was evaluated as GAC size. At optimum regeneration conditions, 6.85 mg DCF/g GAC adsorption capacity was found with an operating cost of €0.05 g GAC. The amount of HCl was the most effective parameter. It was determined that the regenerated GAC had an adsorptive capacity higher than the adsorptive capacity of the raw GAC during at least three regeneration cycles. Raw, spent and regenerated GACs were characterized by Fourier transform infrared spectrometry and scanning electron microscopy analysis.
双氯芬酸钠（DCF）是一种非甾体抗炎药。即使在低浓度下，它也被归类为具有生态毒性。在这项研究中，研究了椰壳基颗粒活性炭（GAC）对 DCF 的吸附以及用盐酸（HCl）再生用过的 GAC。结果表明，具有非均相表面结构的 GAC 以化学和物理力的方式吸附 DCF，是一种吸热过程。使用田口实验设计优化了吸附和再生过程。通过方差分析和 Pareto 分析确定了所有影响吸附和再生过程的参数的影响。在最佳条件下，可获得 79.80%的 DCF 去除率，最有效的参数被评估为 GAC 粒径。在最佳的再生条件下，发现 6.85 mg DCF/g GAC 的吸附容量，每克 GAC 的运行成本为 0.05 欧元。HCl 的用量是最有效的参数。确定在至少三个再生循环中，再生后的 GAC 的吸附能力高于原始 GAC 的吸附能力。通过傅里叶变换红外光谱和扫描电子显微镜分析对原始、用过的和再生的 GAC 进行了表征。
