Research Laboratory 'Desalination and Water Treatment LR19ES01', Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis 2092, Tunisia.
Department of Chemical Engineering, School of Mining, Metallurgy and Chemical Engineering, University of Johannesburg, P. O. Box 17011, Doornfontein 2028, South Africa; School of Chemical and Metallurgical Engineering, University of the Witwatersrand, 2050 Johannesburg, South Africa; Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia; School of Resources and Environment, University of Electronic Science and Technology of China (UESTC), NO. 2006, Xiyuan Ave., West High-Tech Zone, Chengdu, Sichuan 611731, P.R. China; Faculty of Science and Technology, School of Applied Physics, University Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia; School of Chemistry, Shoolini University, Solan, Himachal Pradesh, 173229, India.
Water Sci Technol. 2021 Aug;84(3):552-575. doi: 10.2166/wst.2021.233.
In this study, a response surface methodology (RSM) approach using central composite design (CCD) was investigated to develop a mathematical model and to optimize the effects of pH, adsorbent amount and temperature related to the hexavalent chromium removal by biosorption on peanut shells (PSh). The highest removal percentage of 30.28% was found by the predicted model under the optimum conditions (pH of 2.11, 0.73 g of PSh and 37.2 °C) for a 100 mg/L initial Cr(VI) concentration, which was very near to the experimental value (29.92%). The PSh was characterized by SEM, EDX, FTIR, BET, XRD analyses. Moreover, a Langmuir isotherm fitted well (R = 0.992) with the experimental data, and the maximum adsorption capacity was discovered to be 2.48 and 3.49 mg/g respectively at 25 and 45 °C. Kinetic data were well foreseen by pseudo second order. Thermodynamic study depicted that biosorption of Cr(VI) onto PSh was spontaneous and endothermic. Regeneration of the PSh using NaOH showed a loss <5% in the Cr(VI) removal efficiency up to three recycle runs. In summary, the Cr(VI) removal onto economic, sensitive and selective biosorbent (PSh) was optimized using CCD to study biosorption behaviors.
在这项研究中，采用中心复合设计（CCD）的响应面法（RSM）来开发数学模型，并优化与花生壳（PSh）生物吸附去除六价铬相关的 pH、吸附剂用量和温度的影响。在初始 Cr(VI)浓度为 100mg/L 的最佳条件（pH 为 2.11、PSh 用量为 0.73g 和温度为 37.2°C）下，预测模型得出的去除率最高为 30.28%，非常接近实验值（29.92%）。通过 SEM、EDX、FTIR、BET、XRD 分析对 PSh 进行了表征。此外，Langmuir 等温线很好地拟合（R = 0.992）了实验数据，在 25 和 45°C 时，最大吸附容量分别为 2.48 和 3.49mg/g。准二级动力学很好地预测了动力学数据。热力学研究表明，Cr(VI)在 PSh 上的吸附是自发和吸热的。使用 NaOH 对 PSh 进行再生，在三个循环运行中，Cr(VI)去除效率的损失<5%。总之，使用 CCD 优化了经济、敏感和选择性生物吸附剂（PSh）对 Cr(VI)的去除，以研究生物吸附行为。
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