Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
Chemosphere. 2022 Nov;307(Pt 2):135806. doi: 10.1016/j.chemosphere.2022.135806. Epub 2022 Aug 5.
The rise in pharmaceutical pollutants due to their unregulated discharge in pharmaceutical wastewater has landed them as emerging contaminants that would gradually affect the aquatic ecosystem and human life. The current study emphasizes the adsorptive elimination of one such emerging pharmaceutical pollutant, i.e., Diclofenac (DIF), using a synthesized adsorbent vis. Activated carbon-chitosan beads (ACCB). The morphological and physicochemical properties of the prepared adsorbent, ACCB and its interaction with the DIF species were investigated. Process parameters influencing the adsorptive interactions between ACCB and DIF were optimised. DIF was efficiently adsorbed at optimised initial DIF pH of 6.0 and ACCB dosage of 1.5 mg/mL at an incubation temperature of 40 °C. Freundlich isotherm model showed the best fit (R = 0.98) with the experimental data to conclude that the adsorbent surface is heterogenous, promoting multilayer adsorption. As depicted from the Langmuir isotherm model, the maximum theoretical adsorption capacity was 99.29 mg/g. The seed toxicity assay confirmed the efficacy of ACCB in the adsorptive removal of DIF species from aqueous setups, making the post-treated solution fit enough for seed germination.
由于未受管制的药物废水中的药物污染物的排放增加，它们已成为新兴污染物，这些污染物会逐渐影响水生生态系统和人类生活。本研究强调使用合成吸附剂，即活性炭-壳聚糖珠（ACCB），来吸附消除一种新兴药物污染物，即双氯芬酸（DIF）。研究了制备的吸附剂、ACCB 的形貌和物理化学性质及其与 DIF 物种的相互作用。优化了影响 ACCB 和 DIF 之间吸附相互作用的工艺参数。在优化的初始 DIF pH 值为 6.0 和 ACCB 剂量为 1.5 mg/mL 的条件下，在 40°C 的孵育温度下，DIF 被有效地吸附。Freundlich 等温模型与实验数据拟合最好（R = 0.98），表明吸附剂表面是不均匀的，有利于多层吸附。从 Langmuir 等温模型可以看出，最大理论吸附容量为 99.29 mg/g。种子毒性试验证实了 ACCB 在从水体系中吸附去除 DIF 物种方面的功效，使经后处理的溶液足以适合种子发芽。
