Potentials of NaOH modified agricultural waste of sorghum bagasse for lead (II) removal from aqueous solution: kinetics, isotherm and thermodynamic studies

IF 1.3 4区环境科学与生态学 Q3 ECOLOGY

Chemistry and Ecology Pub Date : 2023-05-03 DOI:10.1080/02757540.2023.2206395

A. Y. Afandi, Y. Kurniawan, Bernadeta Ayu Widyaningrum, Tamara Matilda, D. W. Indriani, Devi Indrasari Mustopa Putri, H. Darmokoesoemo, H. Kusuma

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Abstract

ABSTRACT The removal of lead from water and wastewater is a serious term for protecting the public and the environmental. Herein, an agriculture waste of sorghum bagasse modified with NaOH was used to adsorb Pb(II) from an aqueous solution. The modified sorghum bagasse (MSB) was characterised by field emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller (BET) method and Fourier transform infrared spectroscopy (FTIR). MSB with NaOH shows smoother, increasing porosity and pore size (mesopore). In a batch system, the parameter adsorption was investigated. The adsorption of Pb(II) by the adsorbents was optimum at pH 5.0, contact time: 15 min, adsorbent dosage: 6 g L−1 and initial concentration: 80 mg L−1. The pseudo second-order model was suitable to describe the kinetic of the process with the diffusion model of the Elovich model. Meanwhile, the adsorption isotherm model was suitable with the Langmuir model and gives a maximum adsorption capacity (qmax) 12.29 mg g−1. The Gibbs free energy was negative, and the enthalpy was negative, indicating the adsorption was a spontaneous and exothermic process. These results indicated that the MSB had potentially become an efficient, sustainable and low-cost adsorbent for Pb(II) uptake from an aqueous solution.

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NaOH改性高粱蔗渣农业废弃物从水溶液中去除铅（II）的潜力：动力学、等温线和热力学研究

从水和废水中去除铅是保护公众和环境的一个重要术语。本研究以农业废弃物高粱甘蔗渣为原料，经氢氧化钠改性后，用于吸附水溶液中的铅(II)。采用场发射扫描电镜(FESEM)、布鲁诺尔-埃米特-泰勒(BET)法和傅里叶变换红外光谱(FTIR)对改性高粱甘蔗渣(MSB)进行了表征。添加NaOH的MSB更光滑，孔隙率和孔径(中孔)增大。在间歇式系统中，研究了吸附参数。在pH为5.0、接触时间为15 min、吸附剂投加量为6 g L−1、初始浓度为80 mg L−1时，吸附剂对Pb(II)的吸附效果最佳。拟二阶模型适合于用Elovich模型的扩散模型来描述过程的动力学。吸附等温线模型与Langmuir模型吻合，最大吸附量(qmax)为12.29 mg g−1。吉布斯自由能为负，焓为负，说明吸附过程为自发放热过程。这些结果表明，MSB有潜力成为一种高效、可持续和低成本的水溶液中铅(II)吸附剂。

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来源期刊

Chemistry and Ecology 环境科学-环境科学

CiteScore

4.20

自引率

16.00%

发文量

审稿时长

3.7 months

期刊介绍： Chemistry and Ecology publishes original articles, short notes and occasional reviews on the relationship between chemistry and ecological processes. This journal reflects how chemical form and state, as well as other basic properties, are critical in their influence on biological systems and that understanding of the routes and dynamics of the transfer of materials through atmospheric, terrestrial and aquatic systems, and the associated effects, calls for an integrated treatment. Chemistry and Ecology will help promote the ecological assessment of a changing chemical environment and in the development of a better understanding of ecological functions.