利用农业废弃物制备的介孔活性炭快速去除水溶液中的锌（II）
Rapid Removal of Zinc(II) from Aqueous Solutions Using a Mesoporous Activated Carbon Prepared from Agricultural Waste.
作者信息
Zhang Xiaotao, Hao Yinan, Wang Ximing, Chen Zhangjing
机构信息
College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China.
College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China.
出版信息
Materials (Basel). 2017 Aug 28;10(9):1002. doi: 10.3390/ma10091002.
A low-cost activated carbon (XSBLAC) prepared from via chemical activation was investigated to determine its adsorption and desorption properties for zinc(II) ions from aqueous solutions. XSBLAC was characterized based on its N₂-adsorption/desorption isotherm, EDX, XRD, SEM and FTIR results. An adsorption study was conducted in a series of experiments to optimize the process variables for zinc(II) removal using XSBLAC. Modeling the adsorption kinetics indicated good agreement between the experimental data and the pseudo-second-order kinetic model. The Langmuir equilibrium isotherm fit the experimental data reasonably well. The calculated enthalpy (Δ⁰), entropy (Δ⁰) and Gibbs free energy (Δ⁰) values revealed the endothermic and spontaneous nature of the adsorption process. HNO₃ displayed the best desorption performance. The adsorption mechanism was investigated in detail through FTIR and SEM/EDX spectroscopic analyses. The results suggested that XSBLAC is a potential biosorbent for removing zinc(II) from aqueous solutions.
研究了一种通过化学活化法由[具体原料]制备的低成本活性炭（XSBLAC），以确定其对水溶液中锌（II）离子的吸附和解吸性能。基于其N₂吸附/解吸等温线、能谱仪（EDX）、X射线衍射仪（XRD）、扫描电子显微镜（SEM）和傅里叶变换红外光谱仪（FTIR）的结果对XSBLAC进行了表征。在一系列实验中进行了吸附研究，以优化使用XSBLAC去除锌（II）的工艺变量。对吸附动力学进行建模表明实验数据与伪二级动力学模型之间具有良好的一致性。朗缪尔平衡等温线与实验数据拟合得相当好。计算得到的焓（Δ⁰）、熵（Δ⁰）和吉布斯自由能（Δ⁰）值揭示了吸附过程的吸热和自发性质。硝酸表现出最佳的解吸性能。通过傅里叶变换红外光谱仪和扫描电子显微镜/能谱仪光谱分析详细研究了吸附机理。结果表明，XSBLAC是一种从水溶液中去除锌（II）的潜在生物吸附剂。
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