Estudo da adsorção de cromo usando biochar proveniente de bagaço de malte: cinética e termodinâmica

Ciencia Rural

article

Rodrigo Geremias¹  Catiane Pelissari¹  Nelson Libardi²  Danielle Carpiné³  Rosemary Hoffmann Ribani³ 

[1] Universidade do Oeste de Santa Catarina;Universidade Federal de Santa Catarina;Universidade Federal do Paraná

关键词: biosorption;    chromium removal;    activated carbon;    brewer’s waste;   

DOI  :  10.1590/0103-8478cr20210914

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

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.

【 授权许可】

Unknown