通过两步热解从椰枣废料中提取生物炭:从水溶液中去除铜 (II) 的改良方法

Processes Pub Date : 2024-06-09 DOI:10.3390/pr12061189
E. R. Mahmoud, Hesham M. Aly, Noura A. Hassan, A. Aljabri, Asim Laeeq Khan, H. El-Labban
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引用次数: 0

摘要

工业生产和农业活动中经常排放铜等重金属,由于其毒性,尤其是可溶形式的铜(II),对环境和健康构成了重大风险。本研究调查了用椰枣叶中肋废料经两步热解工艺制成的生物炭作为一种可持续且经济的吸附剂从水溶液中去除铜(II)的有效性,并使用扫描电子显微镜(SEM)、能量色散 X 射线光谱(EDX)、傅立叶变换红外光谱(FTIR)和布鲁诺-埃美特-泰勒(BET)表面积分析对生物炭进行了表征。吸附实验评估了 pH 值、吸附剂用量、接触时间和初始铜(II)浓度的影响。在 pH 值为 6 时,吸附容量最大,达到 70 毫克/克。伪二阶动力学模型对吸附数据进行了最佳描述,表明化学吸附是主要机制。热力学研究表明,吸附过程是自发和放热的,25 °C 时的吉布斯自由能变化(ΔG)为 -1.245 kJ/mol,焓变化(ΔH)为 -15.71 kJ/mol,熵变化(ΔS)为 48.36 J/mol-K。可重复使用性测试表明,生物炭在五个循环后保留了超过 85% 的初始吸附容量,第一个循环的容量为 60 毫克/克,到第五个循环时降至 52 毫克/克。这项研究强调了从枣椰树废料中提取的生物炭作为一种高效、可持续的吸附剂去除废水中铜(II)的潜力,有助于环境管理和废物价值化。未来的研究应侧重于优化生物炭的生产过程,并探索其在去除其他污染物方面的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Biochar from Date Palm Waste via Two-Step Pyrolysis: A Modified Approach for Cu (II) Removal from Aqueous Solutions
Heavy metals such as copper, often discharged from industrial processes and agricultural activities, pose significant environmental and health risks due to their toxicity, particularly in the soluble form of Cu (II). This study investigates the effectiveness of biochar produced from date palm leaf midrib waste via a two-step pyrolysis process, as a sustainable and economical adsorbent for removing Cu (II) from aqueous solutions The biochar was characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) surface area analysis. Adsorption experiments were conducted to evaluate the effects of pH, adsorbent dosage, contact time, and initial Cu (II) concentration. The maximum adsorption capacity was observed at pH 6, with a capacity of 70 mg/g. The adsorption data were best described by the pseudo-second-order kinetic model, indicating chemisorption as the primary mechanism. Thermodynamic studies indicated that the adsorption process was spontaneous and exothermic, with a Gibbs free energy change (ΔG) of −1.245 kJ/mol at 25 °C, enthalpy change (ΔH) of −15.71 kJ/mol, and entropy change (ΔS) of 48.36 J/mol·K. Reusability tests demonstrated that the biochar retained over 85% of its initial adsorption capacity after five cycles, with capacities of 60 mg/g in the first cycle, decreasing to 52 mg/g by the fifth cycle. This study highlights the potential of biochar derived from date palm waste as an efficient, sustainable adsorbent for the removal of Cu (II) from wastewater, contributing to both environmental management and waste valorization. Future research should focus on optimizing the biochar production process and exploring its application for the removal of other contaminants.
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