乙醇处理对树脂基纳米水合氧化铁结构及其除砷性能的影响

通过考察乙醇处理对树脂基纳米水合氧化铁(D201-HFO)结构及其除砷性能的影响,评价乙醇处理在复合材料制备中的必要性.结果表明,乙醇处理后负载水合氧化铁(HFO)在D201树脂内的分散性增加,材料对砷的饱和吸附量提高约20%,且复合材料的比表面积、孔容、孔径分别增加了52%、65%、28%;但乙醇处理对复合材料的机械强度和负载HFO的晶型无影响,在pH值、离子竞争对该材料除砷性能的影响趋势方面也无明显作用,对复合材料固定床除砷性能及再生方面也无明显作用.总体而言,乙醇处理对D201-HFO复合材料实际除砷性能影响不大,从技术经济性考虑可以省略.

Ethanol-Induced Influence on the Structure and Arsenate Adsorption of Resin-based Nano-hydrated Ferric Oxide

Here the role of ethanol in the synthesis of a new nanocomposite (D201-HFO) was evaluated in terms of its structure variation and arsenate adsorption. Results indicated that the ethanol-induced procedure improved the dispersion of HFO inside the polymer host D201 and increased the HFO sorption capacities towards arsenate by 20%. Also, the ethanol-induced procedure resulted in the increase of pore size, pore volume, and specific surface area of D201-HFO by 52%, 65% and 28%, respectively. Nevertheless, ethanol rinsing did not affect the mechanical strength of D201-HFO and the crystal type of the immobilized HFO. Little effects of the ethanol process was observed on the pH and co-anion dependent adsorption of arsenate. Furthermore, the ethanol step posed insignificant influence on the fix-bed adsorption and the repeated use of the adsorbent. The results showed that the ethanol procedure exerted little influence on the sorption properties of D201-HFO from the viewpoint of practical application and thus, it could not be included.