用硫酸亚铁制纳米氧化铁黄

以硫酸亚铁为原料，以氨水为沉淀剂，以空气氧化制纳米氧化铁黄。用XRD和TEM对产物粒子进行了表征。所得α-FeOOH粒子为针状，粒度均匀，长轴150-200nm左右，短轴20nm左右。

Preparation of polymer-supported hydrated ferric oxide based on Donnan membrane effect and its application for arsenic removal

In the present study a novel technique was proposed to prepare a polymer-supported hydrated ferric oxide (D201-HFO) based on Donnan membrane effect by using a strongly basic anion exchanger D201 as the host material and FeCl3-HCl-NaCl solution as the reaction environment. D201-HFO was found to exhibit higher capacity for arsenic removal than a commercial sorbent Purolite ArsenX. Furthermore, it presents favorable adsorption selectivity for arsenic removal from aqueous solution, as well as satis- factory kinetics. Fixed-bed column experiments showed that arsenic sorption on D201-HFO could re- sult in concentration of this toxic metalloid element below 10 μg/L, which was the new maximum con- centration limit set recently by the European Commission and imposed by the US EPA and China. Also, the spent D201-HFO is amenable to efficient regeneration by NaOH-NaCl solution.

HCl浓度对水合氧化铁复合吸附剂P吸附效能的影响

为避免传统水合氧化铁(HFO)负载树脂复合吸附剂制备过程中大量使用HCl对设备防腐、安全及环保带来的问题,优化HFO复合吸附剂的制备工艺方法,改变负载液中HCl浓度制备得到多种HFO复合吸附剂,考察制备得到的HFO复合吸附剂对P的吸附动力学、吸附等温线、初始pH、共存离子影响、解吸再生方法等,评价负载液中HCl浓度对吸附剂吸附效能的影响。结果表明,负载液中HCl浓度由2 mol·L^(-1)降低至0.5 mol·L^(-1),并不会显著降低HFO复合吸附剂的P吸附容量。HCl浓度为0.5 mol·L^(-1)时制备得到的HFO复合吸附剂对P的最大吸附容量为29.67 mg·g^(-1),显著高于D201树脂载体(16.39 mg·g^(-1)),其吸附动力学曲线更符合准一级吸附动力学模型,最佳的P吸附pH为6~8,在共存离子Cl^(-)、NO3^(-)、SO4^(2-)、CO3^(2-)浓度为1.0 g·L^(-1)的条件下,吸附剂对P的吸附容量降低31.1%~53.0%。采用5wt%的NaOH溶液能有效实现吸附剂中P的解吸再生。