Removal of Pb(II) Ions from Aqueous Solutions by Spherical Nanocomposites Synthesized Through Immobilization of Paecilomyces lilacinus in Silica Nanoparticles Coated with Ca-Alginate
Removal of Pb(II) Ions from Aqueous Solutions by Spherical Nanocomposites Synthesized Through Immobilization of Paecilomyces lilacinus in Silica Nanoparticles Coated with Ca-Alginate
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通过将淡紫拟青霉固定在海藻酸钙涂覆的二氧化硅纳米颗粒中合成的球形纳米复合材料去除水溶液中的 Pb(II) 离子
DOI：
10.1166/jnn.2020.17349
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发表时间：
2020
影响因子：
--
通讯作者：
Ding Li
中科院分区：
文献类型：
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作者：
Xiaofang Ruan;Ruyi Li;Zhexu Ding;Jun Luo;Qilin Liu;Chao Deng;Ding Li
本研究合成了一种新型微生物纳米复合材料“丁香拟青霉-二氧化硅纳米颗粒-海藻酸钙微球”（P. lilacinus-SN-Cal-Alg），并证明了其对水溶液中Pb（II）离子的高效去除效果。采用FT-IR、SEM-EDS和XPS对P. lilacinus-SN-Cal-Alg珠吸附Pb（II）前后的形貌进行了表征。研究了紫丁香- sn - cal - alg微球在水溶液中对铅（II）的吸附能力。为了比较，我们还平行研究了另一种微生物复合材料，即P. lilacinus-Cal-Alg微球，在不添加纳米二氧化硅的情况下，对Pb（II）的吸附能力。最后，采用Langmuir和Freundlich等温模型对吸附过程中的平衡数据进行了检验，以评价吸附机理。结果表明，在初始浓度为200 mg/L时，丁香丁香- sn - cal - alg微球对Pb（II）的去除率为85.54%。同时，它们对Pb（II）的吸附能力优于紫丁香-钙alg珠。P. lilacinus-SN-Cal-Alg微球对Pb（II）离子的吸附过程用Langmuir模型进行了最好的描述，表明微球对Pb（II）离子的吸附发生在微球表面，其最大吸附量为282.49 mg/g。
In the present study, a novel microbial nanocomposite “Paecilomyces lilacinus-silica nanoparticlescalcium-alginate beads” (P. lilacinus-SN-Cal-Alg) were synthesized and their high efficiency for removing Pb(II) ions was demonstrated in aqueous solution. P. lilacinus-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 P. lilacinus-SN-Cal-Alg beads was analyzed in aqueous solution. For comparison, the adsorption capacity of Pb(II) by another type of microbial composites, namely, P. lilacinus-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 P. lilacinus-SN-Cal-Alg beads. Meanwhile, they exhibited the better adsorption capacity for Pb(II) than P. lilacinus-Cal-Alg beads. The adsorption process by P. lilacinus-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.