Nanotechnology and Catalysis Research Center, University of Malaya, Kuala Lumpur 50603, Malaysia.
Center of Environment and Water, King Fahd University of Petroleum and Minerals, Dhahran 34464, Saudi Arabia.
Int J Mol Sci. 2021 Feb 19;22(4):2090. doi: 10.3390/ijms22042090.
This study deals with the preparation of activated carbon (CDSP) from date seed powder (DSP) by chemical activation to eliminate polyaromatic hydrocarbon-PAHs (naphthalene-CH) from synthetic wastewater. The chemical activation process was carried out using a weak Lewis acid of zinc acetate dihydrate salt (Zn(CHCO)·2HO). The equilibrium isotherm and kinetics analysis was carried out using DSP and CDSP samples, and their performances were compared for the removal of a volatile organic compound-naphthalene (CH)-from synthetic aqueous effluents or wastewater. The equilibrium isotherm data was analyzed using the linear regression model of the Langmuir, Freundlich and Temkin equations. The R values for the Langmuir isotherm were 0.93 and 0.99 for naphthalene (CH) adsorption using DSP and CDSP, respectively. CDSP showed a higher equilibrium sorption capacity () of 379.64 µg/g. DSP had an equilibrium sorption capacity of 369.06 µg/g for CH. The rate of reaction was estimated for CH adsorption using a pseudo-first order, pseudo-second order and Elovich kinetic equation. The reaction mechanism for both the sorbents (CDSP and DSP) was studied using the intraparticle diffusion model. The equilibrium data was well-fitted with the pseudo-second order kinetics model showing the chemisorption nature of the equilibrium system. CDSP showed a higher sorption performance than DSP due to its higher BET surface area and carbon content. Physiochemical characterizations of the DSP and CDSP samples were carried out using the BET surface area analysis, Fourier-scanning microscopic analysis (FSEM), energy-dispersive X-ray (EDX) analysis and Fourier-transform spectroscopic analysis (FTIR). A thermogravimetric and ultimate analysis was also carried out to determine the carbon content in both the sorbents (DSP and CDSP) here. This study confirms the potential of DSP and CDSP to remove CH from lab-scale synthetic wastewater.
本研究通过化学活化法从枣核粉（DSP）中制备活性炭（CDSP），以去除合成废水中的多环芳烃（萘-CH）。化学活化过程使用弱路易斯酸醋酸锌二水合物盐（Zn（CHCO）·2HO）进行。使用 DSP 和 CDSP 样品进行平衡等温线和动力学分析，并比较它们在去除挥发性有机化合物-萘（CH）方面的性能-从合成水流出物或废水中。使用 Langmuir、Freundlich 和 Temkin 方程的线性回归模型分析平衡等温线数据。对于使用 DSP 和 CDSP 吸附萘（CH）的平衡等温线，R 值分别为 0.93 和 0.99。CDSP 显示出更高的平衡吸附容量（），为 379.64 µg/g。DSP 对 CH 的平衡吸附容量为 369.06 µg/g。使用拟一级、拟二级和 Elovich 动力学方程估计 CH 吸附的反应速率。使用内扩散模型研究了两种吸附剂（CDSP 和 DSP）的反应机制。平衡数据很好地符合拟二级动力学模型，表明平衡体系的化学吸附性质。CDSP 表现出比 DSP 更高的吸附性能，这是由于其更高的 BET 表面积和碳含量。使用 BET 表面积分析、傅里叶扫描显微镜分析（FSEM）、能量色散 X 射线（EDX）分析和傅里叶变换光谱分析（FTIR）对 DSP 和 CDSP 样品进行了物理化学特性分析。还进行了热重和极限分析，以确定两种吸附剂（DSP 和 CDSP）中的碳含量。这项研究证实了 DSP 和 CDSP 从实验室规模合成废水中去除 CH 的潜力。
