摘要
针对纳米Fe0在空气中易被氧化的问题,应用海藻酸钠、β-环糊精对纳米Fe0进行协同固定化,考察了原料配比、交联剂浓度等对凝胶球性能的影响,并对固定化纳米Fe0材料的稳定性进行了考察。实验结果表明:以1.5%SA、0.5%β-CD为原料,4.0%Ca Cl2为交联剂制备的固定化纳米Fe0具有较高的反应活性;固定化Fe0对Pb2+的去除效率明显高于Cd2+,反应4 h,200 mg/L的Pb2+去除率可达99.3%,主要通过凝胶球与Fe0联合作用去除。该材料保存120 d后仍具有较高的反应活性。
To avoid the oxidation of nano-Fe0 in the air,nanoparticles were immobilized in sodium alginate / β-cyclodextrin gelbeads. The effects of the ratio of raw materials and cross-linker concentration et al. on gel-beads properties were investigated.Optimal reactivity was received with the nano-Fe0 immobilized by 1. 5% SA,0. 5% β-CD and with 4. 0% Ca Cl2 as the crosslinker. Much higher removal efficiency was obtained in Pb2 +removal compared with Cd2 +. Pb2 +( 200 mg/L) with 99. 3%removal ratio was obtained after 4 h. Pb2 +was removed by gel-beads combined with Fe0. High reactivity was still achieved after 120 days with the immobilized nano-Fe0.
出处
《环境工程》
CAS
CSCD
北大核心
2015年第6期144-147,共4页
Environmental Engineering
基金
河南省教育厅科学技术研究重点项目(13B610908)
关键词
海藻酸钠
Β-环糊精
纳米Fe0
交联固定化
重金属
sodium alginate
β-cyclodextrin
nanoscale Fe0
cross-linked immobilization
heavy metals
