改性纤维素负载零价铁去除三氯甲烷的研究

以接枝改性后的纤维素SCB为载体,采用液相还原法制备改性纤维素负载零价铁吸附剂ZVI-SCB,利用XRD、ESEM进行表征,并研究其对三氯甲烷(TCM)的去除性能.系统探讨了不同材料、ZVI-SCB投加量、TCM的初始质量浓度、pH值和氯离子质量浓度对TCM去除性能的影响.在ZVI-SCB投加量为5g/L,TCM的初始质量浓度为36.7mg/L,pH值为3.1时,TCM的去除率高达84.4%.采用准一级方程和准二级方程对ZVI-SCB去除TCM的过程进行拟合,准二级动力学方程相关系数R的范围为0.996~0.999,证明ZVI-SCB对TCM的去除过程符合二级动力学模型.

Investigation on the removal of trichloromethane using modified cellulose supported zero-valent iron adsorbents

Grafted cellulose was used as carrier for preparing cellulose supported zero-valent iron adsorbents (ZVI-SCB) by aqueous reducing technique. The ZVI-SCB was characterized by XRD and ESEM. The removal of trichloromethane (TCM) by ZVI-SCB was investigated under different conditions, i.e., catalyst kinds, ZVI-SCB dosage, initial concentration of trichlormethane (TCM), pH value and concentration of chloridion. When dosage of ZVI-SCB was 5g/L, the initial concentration of TCM was 36.7mg/L and the solution pH was 3.1, the removal percentage of TCM reached 84.4%. In addition, the obtained data were modeled using pseudo-first-order equation and second-order equation. The correlation coefficient R of pseudo-second-order equation was 0.996~0.999, indicating that the better fit of experimental data was obtained by means of the pseudo-second-order model.