National Research Center for Disaster-Free and Safe Ocean City, Dong-A University, Busan, 49315, Republic of Korea.
Department of Environmental Engineering and Science, Chia-Nan University of Pharmacy and Science, 71710, Tainan, Taiwan.
Environ Sci Pollut Res Int. 2020 Jul;27(20):24659-24670. doi: 10.1007/s11356-019-06083-0. Epub 2019 Aug 13.
Fixed-bed studies were performed to evaluate the removal efficiency of copper (Cu(II)) from aqueous solution using chitosan-coated bentonite (CCB), chitosan-coated sand (CCS), and chitosan-coated kaolinite (CCK). The thermal and morphological properties of CCB, CCK, and CCS were characterized using thermogravimetric analysis, Fourier transform infrared spectroscopy, and the Brunauer-Emmett-Teller method. Dynamic experiments were carried out to investigate the effect of solution pH (3.0 to 5.0) and initial Cu(II) concentration (200 to 1000 mg/L) on the time to reach breakthrough (t), total volume of treated effluent (V), and adsorption capacity at breakthrough (q). Results show that increasing the initial Cu(II) concentration inhibits the column performance where lower V, t, and q were obtained. Decreasing the pH from 5.0 to 3.0 led to improved removal efficiency with higher values of V, t, and q. Under pH 3.0 and 200 mg/L, the maximum removal efficiency of 68.60%, 56.10%, and 58.90% for Cu(II) was attained using CCB, CCS, and CCK, respectively. The Thomas model was determined to adequately predict the breakthrough curves based on high values of coefficient of determination (R ≥ 0.8503). Regeneration studies were carried out using 0.1 M HCl and 0.1 M NaOH solution in the saturated column of CCB, CCK, and CCS.
采用壳聚糖包覆膨润土（CCB）、壳聚糖包覆砂（CCS）和壳聚糖包覆高岭土（CCK），通过固定床实验研究了从水溶液中去除铜（Cu(II)）的效率。通过热重分析、傅里叶变换红外光谱和 Brunauer-Emmett-Teller 法对 CCB、CCK 和 CCS 的热和形态特性进行了表征。进行了动态实验，以研究溶液 pH 值（3.0 至 5.0）和初始 Cu(II)浓度（200 至 1000 mg/L）对穿透时间（t）、处理流出液总体积（V）和穿透时吸附容量（q）的影响。结果表明，增加初始 Cu(II)浓度会抑制柱性能，导致获得的 V、t 和 q 较低。将 pH 值从 5.0 降低至 3.0 导致去除效率提高，V、t 和 q 值较高。在 pH 3.0 和 200 mg/L 下，CCB、CCS 和 CCK 对 Cu(II)的最大去除效率分别为 68.60%、56.10%和 58.90%。基于高决定系数（R≥0.8503），Thomas 模型被确定为能够充分预测穿透曲线。在饱和的 CCB、CCK 和 CCS 柱中，使用 0.1 M HCl 和 0.1 M NaOH 溶液进行了再生研究。
