Green Synthesis of CdS Nanoparticles and their Potential Application towards Adsorption of Lead and Cadmium ions

Q4 Earth and Planetary Sciences

Research Journal of Chemistry and Environment Pub Date : 2023-10-15 DOI:10.25303/2711rjce072081

Elakkiya G. Tamil, R. Chandrasekhar, G. Sundararajan

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Abstract

Watermelon rind aqueous extract mediated synthesis of CdS nanoparticles was investigated for its efficiency towards removal of lead and cadmium ions from aqueous solutions. Batch adsorption investigations were performed to optimise the experimental conditions. The optimised conditions were found to be pH 6, 1 g L-1, 30 min and 303 K respectively for the removal of lead and cadmium ions. The equilibrium data obtained was analysed with isotherm models and it was found that Langmuir and Freundlich isothersm explain better and the loading capacities were found to be 332.2 and 318.7 mg L-1 respectively for Pb2+ ad Cd2+ ions. Kinetic investigations suggest that pseudo second order kinetic model fits well to the experimental data suggesting that chemical reactions govern the rate limiting step. The spontaneous and exothermic nature of the present process was successfully demonstrated by the thermodynamic investigations. Desorption and regeneration studies suggest that the CdS nanoparticles can be successfully regenerated 5 times and reused in the adsorption process.

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CdS纳米颗粒的绿色合成及其在吸附铅和镉离子方面的潜在应用

研究了西瓜皮水提物介导的CdS纳米颗粒对水溶液中铅和镉离子的去除效果。进行了间歇吸附实验，优化了实验条件。结果表明，在pH为6、1 g L-1、30 min和303 K的条件下，铅和镉离子的脱除效果最佳。用等温线模型分析得到的平衡数据，发现Langmuir等温线和Freundlich等温线能更好地解释Pb2+和Cd2+离子的负载能力分别为332.2和318.7 mg L-1。动力学研究表明，拟二级动力学模型与实验数据吻合较好，表明化学反应控制了限速步骤。热力学研究成功地证明了该过程的自发和放热性质。解吸和再生研究表明，CdS纳米颗粒可成功再生5次，并在吸附过程中重复使用。

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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