Efficient removal of tizanidine and tetracycline from water: A single and competitive sorption approach using carboxymethyl cellulose granulated iron-pillared clay

IF 7.5 Q1 CHEMISTRY, PHYSICAL
Hanieh Khoshsima Bazkiaee , Seyedmehdi Sharifian , Neda Asasian-Kolur , Hanieh Najafi , Azadeh Ebrahimian Pirbazari , Michael Harasek
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Abstract

This study deals with the development of a granulated Fe-pillared clay (Fe-PC) using carboxymethylcellulose (CMC) as a binder to present it as an innovative adsorbent for the individual and competitive adsorption of tetracycline (Tc) and tizanidine (Tz) from water. An optimum pH value of 7 was determined for both individual and multi-component adsorption. The optimal dosage of granulated Fe-PC was determined to be 1.5 g/L for Tz and 3 g/L for Tc, resulting in constant removal rates of 80 % for Tc and 90 % for Tz. Tizanidine showed a higher affinity for powdered or granulated Fe-PC compared to tetracycline, due to its smaller molecular size and increased amine functional groups. Consequently, Tz showed improved kinetic rates (initial pseudo-second order sorption rates of 170.79 and 25.62 mg/g.h for Tz and Tc, respectively) and equilibrium capacities (maximum monolayer adsorption capacity of granulated Fe-PC at room temperature over Tc and Tz, 54.89 mg/g and 66.40 mg/g). Granulation affected the kinetic rate for both adsorbates, albeit with a more pronounced effect for Tc. The adsorption of Tz was less sensitive to temperature changes, indicating a lower enthalpy change of adsorption (14.24 and 77.91 kJ/mol for Tz and Tc, respectively). HCl for Tc and NaCl for Tz were identified as optimal desorption eluents, confirming the involvement of cation exchange in Tz adsorption. Surface functional group analysis confirmed the proposed complexation mechanisms. Tz consistently showed a higher affinity for granular Fe-PC than Tc, especially at lower adsorbent dosages. This article provides a comprehensive insight into the characterization of the prepared adsorbents and their cyclic adsorption-desorption performance for Tc and Tz.

高效去除水中的替扎尼定和四环素:使用羧甲基纤维素颗粒铁柱粘土的单一竞争吸附法
本研究以羧甲基纤维素(CMC)为粘合剂,开发了一种粒状铁质柱状粘土(Fe-PC),将其作为一种创新吸附剂,用于单独和竞争性吸附水中的四环素(Tc)和替扎尼丁(Tz)。确定了单独吸附和多组分吸附的最佳 pH 值为 7。粒状 Fe-PC 的最佳用量对 Tz 来说是 1.5 克/升,对 Tc 来说是 3 克/升,因此对 Tc 和 Tz 的去除率分别为 80% 和 90%。与四环素相比,替扎尼定对粉末状或颗粒状 Fe-PC 的亲和力更高,这是因为其分子尺寸更小,胺官能团更多。因此,Tz 的动力学速率(Tz 和 Tc 的初始假二阶吸附速率分别为 170.79 和 25.62 mg/g.h)和平衡容量(室温下粒状 Fe-PC 的最大单层吸附容量分别为 54.89 mg/g 和 66.40 mg/g)均有所提高。造粒会影响两种吸附剂的动力学速率,但对 Tc 的影响更为明显。Tz 的吸附对温度变化的敏感性较低,这表明其吸附焓变化较小(Tz 和 Tc 分别为 14.24 和 77.91 kJ/mol)。Tc 的最佳解吸洗脱剂是盐酸,Tz 的最佳解吸洗脱剂是氯化钠,这证实了阳离子交换参与了 Tz 的吸附。表面官能团分析证实了所提出的络合机制。Tz 对颗粒状 Fe-PC 的亲和力始终高于 Tc,尤其是在吸附剂用量较低的情况下。本文全面介绍了所制备吸附剂的特性及其对 Tc 和 Tz 的循环吸附-解吸性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
8.10
自引率
1.60%
发文量
128
审稿时长
66 days
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