木薯茎生物炭（CSB）去除采出水中的铬：可持续吸附和环境影响

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-10-03 DOI:10.1002/jctb.7761

Vasu Gajendiran, Prabu Deivasigamani, Selvaraju Sivamani, Saikat Banerjee, B.S. Naveen Prasad

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引用次数: 0

摘要

采出水是石油和天然气开采的副产品，通常含有高浓度的重金属，包括铬，构成重大的环境和健康风险。以木薯茎为原料，热解制备了木薯茎生物炭（CSB），并研究了其去除采出水中铬（Cr）的潜力。通过批量吸附实验，考察了不同pH、接触时间、初始采出水浓度、吸附剂用量、搅拌速度、温度和粒径条件下CSB的吸附能力。结果从实验结果来看，CSB对采出水中的铬离子具有良好的吸附能力。发现吸附过程高度依赖于pH，在pH为4.0时观察到最大的去除效率。平衡数据拟合Freundlich等温线模型，表明在非均质表面上有多层吸附。动力学数据表明，吸附过程符合准一级和准二级动力学，表明吸附机制为物理吸附和化学吸附。热力学参数，包括焓（ΔH）和熵（ΔS）的变化进行了评估，以深入了解吸附过程的自发性和可行性。负ΔH值表明Cr在CSB上的吸附是非自发的，是放热的。负ΔS值表明吸附是可行的。结论：该综合研究表明，木薯茎生物炭作为一种有效的环境友好型吸附剂，具有去除采出水中铬的潜力。©2024化学工业学会（SCI）。

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Cassava stem biochar (CSB) for chromium removal from produced water: sustainable adsorption and environmental implications

BACKGROUND

Produced water, a byproduct of oil and gas extraction, often contains elevated levels of heavy metals, including chromium, posing significant environmental and health risks. Cassava stem biochar (CSB) was prepared by pyrolysis of cassava stem and its potential has been investigated for the removal of chromium (Cr) from produced water. Batch adsorption experiments were conducted to evaluate the adsorption capacity of CSB under various conditions of pH, contact time, initial produced water concentration, adsorbent dosage, agitation speed, temperature and particle size.

RESULTS

From the experiment results, it was found that CSB showed good adsorption capacity of chromium ions from produced water. The adsorption process was found to be highly pH-dependent, with maximum removal efficiency observed at a pH of 4.0. Equilibrium data were fitted to the Freundlich isotherm models, indicating multilayer adsorption on a heterogeneous surface. The kinetic data demonstrated that the adsorption process followed pseudo-first-order as well as pseudo-second-order kinetics, suggesting a physisorption and chemisorption mechanism. The thermodynamic parameters, including changes in enthalpy (ΔH), and entropy (ΔS), were evaluated to gain insights into the spontaneity and feasibility of the adsorption process. The negative ΔH values indicated that the adsorption of Cr onto CSB was non-spontaneous and exothermic in nature. The negative ΔS value suggested the adsorption is feasible.

CONCLUSION

This comprehensive study demonstrates the potential of cassava stem biochar as an effective and environmentally friendly adsorbent for the removal of chromium from produced water. © 2024 Society of Chemical Industry (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.