University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, Belgrade 11120, Serbia.
Military Technical Institute, Ratka Resanovica 1, Belgrade 11000, Serbia; Innovation Center of the Faculty of Technology and Metallurgy Ltd., University of Belgrade, Karnegijeva 4, Belgrade 11120, Serbia.
Int J Biol Macromol. 2020 Aug 1;156:1160-1173. doi: 10.1016/j.ijbiomac.2019.11.152. Epub 2019 Nov 20.
Novel highly effective amino-functionalized lignin-based biosorbent in the microsphere geometry (A-LMS) for removal of heavy metal ions, was synthesized via inverse suspension copolymerization of kraft lignin with poly(ethylene imine) grafting-agent and epoxy chloropropane cross-linker. Optimization of A-LMS synthesis, performed with respect to the quantity of sodium alginate emulsifier (1, 5 and 10 wt%), provides highly porous microspheres A-LMS_5, using 5 wt% emulsifier, with 800 ± 80 μm diameter, 7.68 m g surface area and 7.7 mmol g of terminal amino groups. Structural and surface characteristics were obtained from Brunauer-Emmett-Teller method, Fourier Transform-Infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy and porosity determination. In a batch test, the influence of pH, A-LMS_5 dose, temperature, contact time on adsorption efficiency of Ni, Cd, As(V) and Cr(VI) ions were studied. The adsorption is spontaneous and feasible with maximum adsorption capacity of 74.84, 54.20, 53.12 and 49.42 mg g for Cd, Cr(VI), As(V) and Ni ions, respectively, obtained by using Langmuir model. Modeling of kinetic data indicated fast adsorbate removal rate with pore diffusional transport as rate limiting step (pseudo-second order model and Weber-Morris equations), thus further confirming high performances of produced bio-adsorbent for heavy metal ions removal.
新型高效氨基功能化木质素基生物吸附剂（A-LMS），采用反相悬浮共聚法，由 kraft 木质素与接枝剂聚（乙二胺）和交联剂环氧氯丙烷合成，用于去除重金属离子。通过相对于海藻酸钠乳化剂的量（1、5 和 10wt%）优化 A-LMS 合成，使用 5wt%乳化剂提供具有 800±80μm 直径、7.68m2g 表面积和 7.7mmolgg 末端氨基的高多孔微球 A-LMS_5。结构和表面特性通过 Brunauer-Emmett-Teller 方法、傅里叶变换红外光谱、扫描电子显微镜、X 射线光电子能谱和孔隙率测定获得。在批量试验中，研究了 pH、A-LMS_5 剂量、温度、接触时间对 Ni、Cd、As(V)和 Cr(VI)离子吸附效率的影响。吸附是自发的，通过 Langmuir 模型获得的 Cd、Cr(VI)、As(V)和 Ni 离子的最大吸附容量分别为 74.84、54.20、53.12 和 49.42mg/g，是可行的。动力学数据的建模表明，具有孔扩散传输作为限速步骤的快速吸附剂去除率（准二级模型和 Weber-Morris 方程），从而进一步证实了所制备的生物吸附剂对重金属离子去除的高性能。
