果壳活性炭与壳聚糖复合吸附剂对铬（VI）的去除：动力学、热力学、平衡及吸附机理

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-10-10 DOI:10.1002/jctb.7767

My Linh Nguyen, Thanh Tung Nguyen, Thi Tuyet Trinh Nguyen, Nha Truc T. Chau, Hoang Long Ngo, Anh T.K. Tran, Ruey-Shin Juang

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引用次数: 0

摘要

铬具有很高的毒性，被广泛应用于许多工业中。本研究将石麻果壳活性炭与壳聚糖（tacc - cs）结合，以提高对废水中六价铬[Cr(VI)]的吸附能力。结果考察了不同的Cr（VI）吸附参数。采用两个等温线模型和两个动力学模型来了解吸附机理。计算了吸附Cr（VI）的热力学特性，即吉布斯自由能变化（ΔG）、焓变化（ΔH）和熵变化（ΔS）。在pH为3、吸附剂剂量为2.5 g L−1、温度为35℃、Cr（VI）初始浓度为50 mg L−1的条件下，吸附效果最佳。Langmuir等温线拟合的Cr（VI）吸附量达到184.45 mg g−1，优于大多数生物质基碳质吸附剂。负ΔG值表明TCAS-CS对Cr（VI）的吸附过程是自发的。此外，傅里叶红外表征证实，壳聚糖与活性炭的结合使其通过螯合作用对Cr（VI）进行化学吸附，而不是单纯通过氢键进行物理吸附，从而大大提高了材料的吸附能力。结论tacc - cs作为一种高效、低成本、环境友好的吸附剂，具有良好的脱除废水中Cr（VI）的潜力。©2024化学工业学会（SCI）。

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Composite adsorbent of Terminalia catappa fruit shell-derived activated carbon and chitosan for enhanced removal of chromium(VI): kinetics, thermodynamics, equilibrium and adsorption mechanism

BACKGROUND

Chromium, which is widely employed in many industries, has a high toxicity. In this research, activated carbon derived from Terminalia catappa fruit shells was combined with chitosan (TCAC-CS) to enhance adsorption capability of hexavalent chromium [Cr(VI)] in wastewater.

RESULTS

Different Cr(VI) adsorption parameters were investigated. Two isotherm and two kinetic models were employed to understand the adsorption mechanism. The thermodynamic characteristics of Cr(VI) adsorption, namely the Gibbs free energy change (ΔG), enthalpy change (ΔH) and entropy change (ΔS), also were computed. The best adsorption capability was achieved at pH 3, adsorbent dose 2.5 g L⁻¹, temperature 35 °C and initial Cr(VI) concentration 50 mg L⁻¹. The Cr(VI) adsorption capacity reached 184.45 mg g⁻¹, as fitted by the Langmuir isotherm, which is superior when compared to most biomass-based carbonaceous adsorbents. The negative ΔG value shows the spontaneous nature of the Cr(VI) adsorption process on the TCAS-CS. Additionally, Fourier transform infrared characterization confirmed that the incorporation of chitosan to activated carbon resulted in chemical adsorption of Cr(VI) via chelating instead of sole physical adsorption via hydrogen bonding, which greatly improved the adsorption ability of the materials.

CONCLUSION

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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.