School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China.
School of Science, Hunan University of Technology, Zhuzhou 412007, China.
J Nanosci Nanotechnol. 2020 Mar 1;20(3):1907-1916. doi: 10.1166/jnn.2020.17349.
In the present study, a novel microbial nanocomposite "-silica nanoparticlescalcium-alginate beads" (-SN-Cal-Alg) were synthesized and their high efficiency for removing Pb(II) ions was demonstrated in aqueous solution. -SN-Cal-Alg beads before and after the adsorption of Pb(II) were characterized by FT-IR, SEM-EDS, and XPS analyses. The adsorption capacity of Pb(II) by -SN-Cal-Alg beads was analyzed in aqueous solution. For comparison, the adsorption capacity of Pb(II) by another type of microbial composites, namely, -Cal-Alg beads, without addition of silica nanoparticles, was also studied in parallel. Lastly, the equilibrium data in adsorption process were examined by both Langmuir and Freundlich isotherm models to evaluate adsorption mechanism. The results showed that an excellent removal efficiency of Pb(II) in aqueous solution (85.54%) was obtained at initial concentration of 200 mg/L by using the -SN-Cal-Alg beads. Meanwhile, they exhibited the better adsorption capacity for Pb(II) than -Cal-Alg beads. The adsorption process by -SN-Cal-Alg beads was best described by the Langmuir model indicating that monolayer adsorption of Pb(II) ions takes place on the beads surfaces and showed that its maximum adsorption capacity was 282.49 mg/g.
在本研究中，合成了一种新型微生物纳米复合材料“-硅纳米颗粒-海藻酸钠珠”(-SN-Cal-Alg)，并证明其在水溶液中对 Pb(II)离子具有高效去除能力。通过 FT-IR、SEM-EDS 和 XPS 分析对吸附 Pb(II)前后的 -SN-Cal-Alg 珠进行了表征。在水溶液中分析了 -SN-Cal-Alg 珠对 Pb(II)的吸附容量。为了进行比较，还平行研究了另一种类型的微生物复合材料，即未添加硅纳米颗粒的 -Cal-Alg 珠对 Pb(II)的吸附容量。最后，通过 Langmuir 和 Freundlich 等温线模型检验了吸附过程中的平衡数据，以评估吸附机制。结果表明，使用 -SN-Cal-Alg 珠在初始浓度为 200mg/L 的条件下，可获得水溶液中 Pb(II)的优异去除效率(85.54%)。同时，它们表现出比 -Cal-Alg 珠更高的吸附 Pb(II)的能力。-SN-Cal-Alg 珠的吸附过程最符合 Langmuir 模型，表明 Pb(II)离子在珠表面发生单层吸附，最大吸附容量为 282.49mg/g。
