Enhanced removal of Cr(VI) from water using alginate-modified algal biochar: a promising adsorbent

IF 4.1 4区工程技术 Q3 ENERGY & FUELS Biomass Conversion and Biorefinery Pub Date : 2024-06-08 DOI:10.1007/s13399-024-05792-y

A. Rekha, K. Vijayalakshmi, Abdullah Alswieleh, P. N. Sudha, J. Daisy Rani, A. Vidhya

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Abstract

Marine algae which bloom in abundance create a pollution problem in the sea and can be well managed by converting it into products like alginate or its biochar and used for water treatment. The current study focuses on utilizing alginate-modified algal biochar to eliminate the heavy metal Cr(VI) from water. Here, biochar (derived from brown algae Sargassum wightii) was combined with sodium alginate to form an innovative adsorbent for Cr(VI) in water. The characteristics of the alginate-modified algal biochar blended film were examined using characterization methods including FTIR, XRD, TGA, and SEM. This blended film had a large surface area of 336.82 m² g⁻¹ with a mean pore size of 22.20 cm³ g⁻¹ and a pore volume of 2.04 cc/g. We investigated the effect of pH, contact time, and adsorbent dosage on the adsorption behavior of Cr(VI) in batch experiments. The findings of the research confirm very high adsorption capacity up to the extent 92% which was observed. It was determined from batch adsorption analysis that Cr(VI) adsorption onto an alginate-modified algal biochar film was highly compliant with the Freundlich isotherm model and that Cr(VI) adsorption kinetics followed the pseudo-2nd-order (PSO) model (R² = 0.999). According to the study’s findings, the blended film containing alginate-modified algal biochar shows potential as a low-cost and ecologically safe adsorbent for eliminating Cr(VI) from aqueous solutions.

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利用海藻酸盐改性海藻生物炭增强对水中六价铬的去除：一种前景广阔的吸附剂

大量繁殖的海藻在海洋中造成了污染问题，可以通过将其转化为海藻酸盐或生物炭等产品并用于水处理来很好地管理。目前的研究重点是利用海藻酸盐修饰的藻类生物炭去除水中重金属Cr（VI）。在这里，生物炭（来源于褐藻马尾藻）与海藻酸钠结合，形成一种新型的水中Cr（VI）吸附剂。采用FTIR、XRD、TGA、SEM等表征方法对藻酸盐改性藻炭混合膜的性能进行了表征。该混合膜的表面积为336.82 m2 g−1，平均孔径为22.20 cm3 g−1，孔体积为2.04 cc/g。通过批量实验考察了pH、接触时间和吸附剂用量对Cr（VI）吸附行为的影响。研究结果证实了其具有很高的吸附量，达到了所观察到的92%。批吸附分析表明，藻酸盐修饰的藻类生物炭膜对Cr（VI）的吸附高度符合Freundlich等温模型，Cr（VI）的吸附动力学符合伪二阶（PSO）模型（R2 = 0.999）。根据研究结果，含有藻酸盐修饰的藻类生物炭的混合膜显示出作为一种低成本和生态安全的吸附剂从水溶液中去除Cr（VI）的潜力。图形抽象

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来源期刊

Biomass Conversion and Biorefinery Energy-Renewable Energy, Sustainability and the Environment

CiteScore

7.00

自引率

15.00%

发文量

1358

期刊介绍： Biomass Conversion and Biorefinery presents articles and information on research, development and applications in thermo-chemical conversion; physico-chemical conversion and bio-chemical conversion, including all necessary steps for the provision and preparation of the biomass as well as all possible downstream processing steps for the environmentally sound and economically viable provision of energy and chemical products.