Chromium adsorption studies using brewer’s spent grain biochar: kinetics, isotherm and thermodynamics

IF 0.8 4区农林科学 Q3 AGRONOMY

Ciencia Rural Pub Date : 2023-03-13 DOI:10.1590/0103-8478cr20210914

Rodrigo Geremias, Catiane Pelissari, Nelson Libardi, D. Carpiné, R. H. Ribani

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引用次数: 0

Abstract

ABSTRACT: Brewer’s spent grain (BSG) is a residue from brewery production, that can be reused as adsorbent of heavy metals like Chromium (Cr). In this study, BSG was used as a biochar for Cr adsorption in batch adsorption experiments. The biochar pyrolysis temperature (500, 600 and 700ºC), pyrolysis time (30, 105 and 180 minutes) and zinc chloride concentration (5, 12.5 and 20%) were evaluated and optimized from a fractional factorial design. An equilibrium adsorption capacity of 78.13 mg.g-1 and a yield of 26.42% were achieved using 700ºC, 30 min, 12.5%. This biochar was applied to the adsorption of Cr in aqueous solution, under different stirring speeds (100, 150 and 200 rpm). The higher agitation speed reduced the adsorption capacity of the coal from 90 to 72 mg.L-1. In addition, the Cr adsorption equilibrium was reached before 100 min. The pseudo-first order model best described the Cr adsorption kinetics. The Redlich-Peterson isothermal model best fitted the experimental data, with the parameter g (close to 1) suggesting Langmuir’s assumptions as the most appropriate to describe the adsorption of Cr on the optimized activated carbon.

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啤酒废粮生物炭对铬的吸附研究:动力学、等温线和热力学

摘要:啤酒废粒(BSG)是啤酒生产过程中产生的残渣，可作为重金属铬(Cr)的吸附剂。在本研究中，BSG作为生物炭进行了Cr的间歇吸附实验。采用分数析因设计对生物炭热解温度(500、600和700℃)、热解时间(30、105和180 min)和氯化锌浓度(5、12.5和20%)进行了评价和优化。平衡吸附量为78.13 mg。在700℃，30 min, 12.5%的条件下，g-1的收率为26.42%。在不同搅拌转速(100、150和200 rpm)下，研究了生物炭对水溶液中铬的吸附。较高的搅拌速度使煤的吸附量从90 mg.L-1降低到72 mg.L-1。在100 min前达到Cr的吸附平衡，拟一级吸附模型最能描述Cr的吸附动力学。Redlich-Peterson等温模型最适合实验数据，参数g(接近1)表明Langmuir假设最适合描述优化后的活性炭对Cr的吸附。

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来源期刊

Ciencia Rural AGRONOMY-

CiteScore

1.70

自引率

0.00%

发文量

233

审稿时长

2-4 weeks

期刊介绍： The purpose of Ciência Rural is to publish the results of original research, note and reviews which contribute significantly to knowledge in Agricultural Sciences. Preference will be given to original articles that develop news concepts or experimental approaches and are not merely repositories of scientific data. The decison of acceptance for publication lies with the Editors and is based on the recommendations of Editorial Comission, Area Committee and/ or ad hoc reviewers. The editors and reviewers are external to the institution.