Adsorption Study of Activated Carbon from Coffee Grounds with H3PO4 Activator as Silver (Ag) Adsorbent

Engineering Headway Pub Date : 2024-04-16 DOI:10.4028/p-ijw10t

Mohammad Ahsani Taqwim, S. Y. Prabawati

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Abstract

Silver (Ag) is one of the heavy metal wastes in the silver industry. Silver metal (Ag) contamination has an impact on human health and the environment so that a metal waste treatment method is needed to minimize the impact. This study used coffee grounds as an adsorbent for silver metal (Ag). The purpose of this study was to determine the characteristics of the adsorbent functional groups, adsorption time stability, optimum adsorbent mass, type of adsorption isotherm, and adsorption free energy (ΔGoAds). Activated carbon was prepared through three processes, namely baking at 110 oC for 2 hours, carbonization at 400 oC for 3 hours, and activation with 1 M H3PO4 for 24 hours. The characterization of the adsorbent was carried out using Fourier Transform Infrared Spectroscopy (FTIR). The results of the adsorbent characterization indicated the presence of functional groups, namely, C-H(Csp3), aromatic C=C, -CH3, and P=O from the remaining H3PO4 activator which experienced a shift in absorption as the adsorbent was treated. The results of this study showed that the stability of Ag adsorption time was 60 minutes and the optimum adsorbent mass was 1 gram. Adsorption isotherm type of metal Ag is Freudlich isotherm with linear equation y = 0.9084x + 0.6272 and R2 value of 0.9219. Isotherm Freudlich provides information on the n value of 1.1008 and KF of 4.238 L/mg. Calculation of adsorption free energy (ΔGoAds) obtained a value of-12.395 kJ/mol so that the adsorption process occurs physically.

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咖啡渣活性炭与 H3PO4 活性剂作为银 (Ag) 吸附剂的吸附研究

银（Ag）是白银工业中的重金属废物之一。银金属（Ag）污染会对人类健康和环境造成影响，因此需要一种金属废物处理方法来尽量减少这种影响。本研究使用咖啡渣作为银金属（Ag）的吸附剂。本研究的目的是确定吸附剂官能团的特性、吸附时间稳定性、最佳吸附剂质量、吸附等温线类型和吸附自由能（ΔGoAds）。活性炭的制备经过三个过程，即在 110 oC 下烘烤 2 小时、在 400 oC 下碳化 3 小时以及用 1 M H3PO4 活化 24 小时。吸附剂的表征采用傅立叶变换红外光谱法（FTIR）进行。吸附剂的表征结果表明，在处理吸附剂时，剩余的 H3PO4 活化剂中存在官能团，即 C-H（Csp3）、芳香族 C=C、-CH3 和 P=O，这些官能团的吸收发生了变化。研究结果表明，Ag 的稳定吸附时间为 60 分钟，最佳吸附剂质量为 1 克。金属 Ag 的吸附等温线类型为 Freudlich 等温线，线性方程为 y = 0.9084x + 0.6272，R2 值为 0.9219。Freudlich 等温线的 n 值为 1.1008，KF 为 4.238 L/mg。吸附自由能（ΔGoAds）的计算值为 12.395 kJ/mol，因此吸附过程是物理过程。

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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Engineering Headway

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