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Scallop shell coated Fe2O3 nanocomposite as an eco-friendly adsorbent for tetracycline removal
Environmental Technology ( IF 2.2 ) Pub Date : 2021-08-29 , DOI: 10.1080/09593330.2021.1966105
Dariush Naghipour 1 , Kamran Taghavi 1 , Jalil Jaafari 1 , Işık Kabdaşlı 2 , Mahmoud Makkiabadi 3 , Mehri Javan Mahjoub Doust 1 , Fatemeh Javan Mahjoub Doust 1
Affiliation  

ABSTRACT

The present study focused on the usability of scallop shell coated Fe2O3 nanoparticles as an eco-friendly new absorbent in the treatment of tetracycline (TC). The process performance in terms of TC removal was investigated at different operating conditions, i.e. at solution pH of 3–11, Fe2O3-scallop dosage of 0.4–2.4 g L−1, initial TC content of 20–120 mg L−1 and temperature of 25–55°C. Solution pH of 7 yielded the highest TC removal efficiency (99%). At this pH value, almost complete TC removal was achieved at a Fe2O3-scallop shell nanocomposite dose of 1.6 g L−1 and 25°C. The responsible TC removal mechanism is suggested as the non-electrical ππ dispersion interaction between the bulk π system on the absorbent surface and TC molecules bearing both benzene rings and double bonds at this solution pH. TC removal efficiency appreciably enhanced up to the Fe2O3-scallop dosage of 1.6 g L−1 being an optimum. Adsorption rate was found to be fast at lower initial TC concentrations than 40 mg L−1. The effect of temperature on TC removal efficiency was insignificant. Adsorption followed the pseudo-second-order kinetic model. Experimental data perfectly fitted by the Langmuir equation. The maximum adsorption capacity was calculated as 49.26 mg g−1. Thermodynamic analysis demonstrated that adsorption process was spontaneous process and endothermic. The results obtained from the present study proved the excellent performance of scallop shell coated Fe2O3 nanoparticles as an eco-friendly adsorbent in TC treatment.



中文翻译:

扇贝壳包覆 Fe2O3 纳米复合材料作为去除四环素的环保吸附剂

摘要

本研究的重点是扇贝壳包覆的 Fe 2 O 3纳米粒子作为一种环保型新型吸收剂在四环素 (TC) 处理中的可用性。在不同操作条件下研究了 TC 去除的工艺性能,即溶液 pH 值为 3-11,Fe 2 O 3 -扇贝剂量为 0.4-2.4 g L -1,初始 TC 含量为 20-120 mg L - 1和 25–55°C 的温度。溶液 pH 值为 7 的 TC 去除效率最高 (99%)。在此 pH 值下,在 1.6 g L −1的 Fe 2 O 3 -扇贝壳纳米复合材料剂量下实现了几乎完全的 TC 去除和 25°C。负责任的 TC 去除机制被认为是吸收表面上的本体π系统与在此溶液 pH 下同时带有苯环和双键的 TC 分子之间的非电π - π分散相互作用。TC 去除效率明显提高,直至1.6 g L -1的 Fe 2 O 3 -扇贝剂量为最佳。在低于 40 mg L -1的初始 TC 浓度下发现吸附速率很快. 温度对 TC 去除效率的影响不显着。吸附遵循伪二级动力学模型。实验数据完全符合朗缪尔方程。最大吸附容量计算为49.26 mg g -1。热力学分析表明吸附过程是自发的吸热过程。从本研究中获得的结果证明了扇贝壳包覆的 Fe 2 O 3纳米粒子作为生态友好型吸附剂在 TC 处理中的优异性能。

更新日期:2021-08-29
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