Adsorption of lead(II) ions using KOH-activated carbon derived from water hyacinth

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-09-19 DOI:10.4314/bcse.v37i6.6

Asmamaw Taye, Solomon Mehretie Mehretie, Shimelis Admassie

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引用次数: 0

Abstract

ABSTRACT. In this study, the adsorption of Pb(II) ions onto potassium hydroxide activated carbon derived from water hyacinth leaf (KOH-AC-WHL) is described. KOH-AC-WHL was characterized using FT-IR spectrometry. The adsorption kinetics and equilibrium were investigated using square wave anodic striping voltammetry (SWASV) for monitoring Pb(II) ions. The adsorption kinetics showed a better fit with the pseudo-second-order kinetics model with good linear correlation coefficients (R2) value of 0.999 compared to R2 value of 0.760 for a pseudo-first-order kinetics. The Langmuir and Freundlich models were used to fit the adsorption experimental data. A better correlation with the Langmuir model was observed with R2 value of 0.994 compared to the R2 value of 0.986 for the Freundlich model. Hence, the maximum adsorption capacity of the adsorbent for Pb(II) ions was calculated from the Langmuir isotherm and found to be 206 mg/g. Thermodynamic parameters were determined and their values showed that the adsorption of Pb(II) ions on KOH-AC-WHL was spontaneous and endothermic. The adsorbent material effectively removed Pb(II) ions from 100 μg/L of Pb(II) simulated wastewater to the World Health Organization (WHO) permissible level of 10.0 μg/L within 30 min. The reusable efficiency of KOH-AC-WHL was found to be 73% after four consecutive cycles. KEY WORDS: Lead(II) ions, Activated carbon, Water hyacinth, Adsorption Bull. Chem. Soc. Ethiop. 2023, 37(6), 1369-1382.DOI: https://dx.doi.org/10.4314/bcse.v37i6.6

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水葫芦koh活性炭吸附铅(II)离子研究

摘要本文研究了水葫芦叶氢氧化钾活性炭(KOH-AC-WHL)对Pb(II)离子的吸附。KOH-AC-WHL采用FT-IR光谱法进行表征。采用方波阳极溶出伏安法(SWASV)对铅离子的吸附动力学和平衡进行了研究。吸附动力学与拟二级动力学模型拟合较好，线性相关系数(R2)为0.999，而拟一级动力学的R2为0.760。采用Langmuir和Freundlich模型拟合吸附实验数据。与Langmuir模型的相关性较好，R2值为0.994,Freundlich模型的R2值为0.986。因此，根据Langmuir等温线计算出吸附剂对Pb(II)离子的最大吸附量为206mg /g。热力学参数的测定表明，KOH-AC-WHL对Pb(II)离子的吸附是自发的、吸热的。吸附材料在30 min内有效去除100 μg/L Pb(II)模拟废水中的Pb(II)离子，达到世界卫生组织(WHO)允许的10.0 μg/L。连续循环4次后，KOH-AC-WHL的重复利用效率为73%。关键词:铅(II)离子，活性炭，水葫芦，吸附;公牛。化学。Soc。中国生物医学工程学报，2017,37(6)，1369-1382。DOI: https://dx.doi.org/10.4314/bcse.v37i6.6

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.