He Yayuan, Xiao Wen, Li Guiyin, Yang Fei, Wu Pian, Yang Tao, Chen Cuimei, Ding Ping
a Xiang Ya School of Public Health , Central South University , Changsha , Hunan , People's Republic of China.
b Hunan Institute of Food Quality Supervision Inspection and Research, Changsha, Hunan, People's Republic of China.
Environ Technol. 2019 Jan;40(4):499-507. doi: 10.1080/09593330.2017.1397762. Epub 2017 Nov 9.
A novel biological material with high adsorption capacity and good selectivity for Pb was synthesized. Response surface methodology was utilized for the optimization of the variables during the synthesis. The synthesized biosorbent was characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The optimized preparation condition for lead-ion-imprinted magnetic biosorbent (Pb(II)-IMB) was obtained (0.19 g chitosan (CTS), 0.43 g magnetic FeO and 2.11 mL/gCTS of epichlorohydrin). The highest value for the removal of lead ion was estimated to be 86.85%, with an absorption capacity of 69.48 mg/g. The characterization results indicated that Pb(II)-IMB was rich in adsorbable groups to adsorb metal ions. Because of the magnetic property of the synthesized products, it can be separated from the water easily. The relative selectivity coefficients of Pb(II)-IMB for Pb(II)/Cu(II), Pb(II)/Cd(II) and Pb(II)/Ni(II) were 2.32, 2.20 and 2.05 times higher than the non-imprinted magnetic biosorbent, respectively. Pb(II)-IMB could be reused at least five times with only ∼13% loss. These results suggested that Pb(II)-IMB was a new, efficient and low-cost material for removing Pb(II) from wastewater.
合成了一种对铅具有高吸附容量和良好选择性的新型生物材料。采用响应面法对合成过程中的变量进行优化。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）和X射线衍射（XRD）对合成的生物吸附剂进行了表征。获得了铅离子印迹磁性生物吸附剂（Pb(II)-IMB）的优化制备条件（0.19 g壳聚糖（CTS）、0.43 g磁性FeO和2.11 mL/g CTS环氧氯丙烷）。铅离子去除率的最高值估计为86.85%，吸附容量为69.48 mg/g。表征结果表明，Pb(II)-IMB富含可吸附金属离子的基团。由于合成产物具有磁性，它可以很容易地从水中分离出来。Pb(II)-IMB对Pb(II)/Cu(II)、Pb(II)/Cd(II)和Pb(II)/Ni(II)的相对选择性系数分别比非印迹磁性生物吸附剂高2.32倍、2.20倍和2.05倍。Pb(II)-IMB可以重复使用至少五次，损失仅约13%。这些结果表明，Pb(II)-IMB是一种从废水中去除Pb(II)的新型、高效且低成本的材料。
