Comparative Kinetic Study of the Adsorption Capacity of Walnut Shell and Its Biochar for Chromium Removal from Wastewater

Muhammad Rizwan, Momina, Rimsha Afzal, A. Noor, Iram Shahzadi, Sana Shireen, Rafia Aleem, Mehboob Khan
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Abstract

Chromium is a toxic heavy metal that can pollute water from industrial and agricultural activities. Adsorption is a promising method for removing chromium from wastewater, and walnut shell is a sustainable and abundant biomass that can be used to produce biochar for adsorption. This study compares the effectiveness of walnut shell and walnut shell biochar for chromium removal from wastewater using adsorption. The effects of various parameters on chromium adsorption, such as pH, biochar dosage, and contact time, are investigated. The results show that both walnut shell and walnut shell biochar are effective adsorbents for chromium removal. However, walnut shell biochar exhibits a higher adsorption capacity and faster adsorption kinetics than walnut shell. The findings of this study suggest that walnut shell biochar is a promising adsorbent for chromium removal from wastewater. It is a sustainable and low-cost material that can be used to develop effective and efficient wastewater treatment systems. The kinetics of Cr adsorption will examine using pseudo-first-order, pseudo-second-order, and adsorption isotherms. The results demonstrated that the adsorption of Cr onto WS and BC followed pseudo-second-order kinetics, suggesting chemisorption as the rate-limiting step.
核桃壳及其生物炭去除废水中铬的吸附能力的动力学比较研究
铬是一种有毒的重金属,会污染工业和农业活动产生的水。吸附是一种很有前景的去除废水中铬的方法,而核桃壳是一种可持续的、丰富的生物质,可用来生产用于吸附的生物炭。本研究比较了核桃壳和核桃壳生物炭利用吸附法去除废水中铬的效果。研究了 pH 值、生物炭用量和接触时间等各种参数对铬吸附的影响。结果表明,核桃壳和核桃壳生物炭都是有效的除铬吸附剂。然而,核桃壳生物炭比核桃壳具有更高的吸附容量和更快的吸附动力学。本研究的结果表明,核桃壳生物炭是一种很有前景的吸附剂,可用于去除废水中的铬。它是一种可持续的低成本材料,可用于开发有效和高效的废水处理系统。利用伪一阶、伪二阶和吸附等温线研究了铬的吸附动力学。结果表明,铬在 WS 和 BC 上的吸附遵循伪二阶动力学,表明化学吸附是限速步骤。
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