Development and Characterization of Carbon-Based Adsorbents Derived from Agricultural Wastes and Their Effectiveness in Adsorption of Heavy Metals in Waste Water.

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2022-09-23 eCollection Date: 2022-01-01 DOI:10.1155/2022/1659855

L Natrayan, S Kaliappan, C Naga Dheeraj Kumar Reddy, M Karthick, N S Sivakumar, Pravin P Patil, S Sekar, Subash Thanappan

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引用次数: 16

Abstract

The current work focuses on peanut shells and agricultural wastes richly in many nations subjected to pyrolysis treatment at various temperatures in the range of 500-800°C to determine the feasible physiochemical characteristics of the biochar. The biochars with the high surface area were employed to adsorb Pb²⁺ (lead) ions, the heaviest pollutants in the water bodies. The raw material, biochar, and pyrolyzed biochar were characterized by SEM, FTIR, partial and elemental analysis, and BET tests. The adsorption characteristics of the biochar, pre- and postpyrolysis treatment, were studied with the assistance of batch adsorption tests under varying test conditions. Adsorbing conditions were determined by evaluating the effects of adsorbing parameters like initial concentration of the lead in water, pH of the adsorbent, contact time, and mixing speed on the effective adsorption of Pb²⁺ ions from water. Langmuir, Freundlich, and Themkin isotherm expressions were employed to study the experimental results. The adsorption kinetics study showed that the synthesized biochars were chemically stable enough to adsorb the Pb ions onto the surface.

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农业废弃物碳基吸附剂的研制、表征及其对废水中重金属的吸附效果

目前的工作重点是在500-800°C的不同温度范围内进行热解处理的花生壳和许多国家丰富的农业废弃物，以确定生物炭的可行物理化学特性。利用高表面积的生物炭吸附水体中最重的污染物Pb2+(铅)离子。采用扫描电镜(SEM)、红外光谱(FTIR)、部分分析和元素分析以及BET测试对原料、生物炭和热解生物炭进行了表征。通过间歇式吸附试验，研究了不同条件下生物炭热解前后的吸附特性。通过考察水中铅的初始浓度、吸附剂的pH、接触时间、混合速度等吸附参数对水中Pb2+的有效吸附效果的影响，确定了吸附条件。采用Langmuir、Freundlich和Themkin等温表达式对实验结果进行研究。吸附动力学研究表明，合成的生物炭具有足够的化学稳定性，可以将Pb离子吸附在表面。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.