Optimization and kinetic study of nitrate removal from aqueous solution using tea waste

IF 2.4 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Journal of chemical technology and biotechnology Pub Date : 2024-12-22 DOI:10.1002/jctb.7798

Lih Xuan Liew, Yin Fong Yeong

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Abstract

BACKGROUND

Nitrate contamination in groundwater poses significant risks to public health and the environment worldwide. This study explores the optimized use of tea waste, a byproduct of tea extraction and consumption, as an adsorbent for the removal of nitrate from aqueous solutions.

RESULTS

Scanning electron microscopy and Brunauer–Emmett–Teller (BET) analysis revealed that tea waste has irregular cluster cavities and visible pore formations, indicating numerous active sites for nitrate adsorption. The specific surface area, total pore volume, and pore diameter were found to be 2.4914 m² g⁻¹, 0.0036 cm³ g⁻¹, and 9.8077 nm, respectively. A total of 20 adsorption experiments were conducted based on conditions recommended by a statistical tool using Design-Expert 13.0 software. The data showed a strong fit to a quadratic model, with a significant P-value of 0.0109 and a high determination coefficient (R² = 0.9327). Using response surface methodology, the study achieved a maximum nitrate removal efficiency of 84.49% under optimal conditions, which included an initial nitrate concentration of 50 mg L⁻¹, an adsorbent weight of 0.706 g, and a contact time of 15 min. Further analysis of adsorption isotherms and kinetics revealed that the Freundlich isotherm (R² = 0.9556) and the pseudo-second-order kinetic model (R² = 0.9454) best described the experimental data.

CONCLUSION

These findings indicate that tea waste is an effective and sustainable adsorbent for mitigating nitrate contamination in aqueous solutions, offering a promising approach to address water quality challenges globally. © 2024 Society of Chemical Industry (SCI).

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茶叶废渣去除水中硝酸盐的优化及动力学研究

背景：地下水中的硝酸盐污染对全世界的公众健康和环境构成重大风险。本研究探索了茶叶提取和消费的副产物——茶叶废弃物作为吸附剂的优化利用，以去除水溶液中的硝酸盐。结果扫描电镜和BET分析显示，茶渣具有不规则的簇状空腔和可见的孔隙结构，表明茶渣具有大量的硝酸盐吸附活性位点。比表面积为2.4914 m2 g−1，总孔容为0.0036 cm3 g−1，孔径为9.8077 nm。采用Design-Expert 13.0软件，根据统计工具推荐的条件，共进行了20次吸附实验。数据与二次型模型拟合良好，p值为0.0109，决定系数较高（R2 = 0.9327）。采用响应面法，在初始硝酸盐浓度为50 mg L−1、吸附剂质量为0.706 g、接触时间为15 min的最佳条件下，硝酸盐的最大去除率为84.49%。进一步的吸附等温线和动力学分析表明，Freundlich等温线（R2 = 0.9556）和拟二级动力学模型（R2 = 0.9454）最能描述实验数据。结论茶渣是一种有效的、可持续的硝酸盐吸附剂，为解决全球水质挑战提供了一种有前景的方法。©2024化学工业学会（SCI）。

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.