碳纳米管泡沫体的制备及其对腐植酸的吸附性能

以碳纳米管、聚氨酯发泡剂为主要原料制备出一种新型高效吸附剂,研究了其对天然水中腐植酸的吸附特性.试验中考察了腐植酸溶液pH值与初始浓度、吸附剂用量与吸附时间对吸附过程与效果的影响.试验发现,碳纳米管泡沫体对腐植酸吸附平衡时间约为5 h;在酸性（pH为3.5）及偏酸性条件下（pH为5.5）,1%CNT泡沫体对腐植酸吸附率高;在腐植酸初始浓度低于20 mg/L与在20~40 mg/L时,其吸附率分别为100%和大于80%.研究结果表明,碳纳米管泡沫体是一种新型高效的吸附剂,在酸性与偏酸性条件下对天然水中腐植酸有很好的吸附效果,碳纳米管泡沫体吸附腐植酸符合Langmuir模型.

Preparation of polyurethane foam/ carbon nanotube composites and adsorption properties for humic acid

A new type sorbent with multi wall carbon nanotube （MWCNT） and polyurethane vesicant was prepared, which can be used to adsorb humic acid（HA） in natural water. The pH value of HA solution, the initial concentration of HA, and the dosage of MWCNT--polyurethane foam how to affect the adsorbing process and efficiency for HA were investigated by a seris of experiments. The experimental result shows that adsorption equilibrium time was about 5 h for adsorbing HA, 1% CNT polyurethane foam had very high adsorbing efficiency at acidic condition（the pH value at 3.5 and 5.5）, the adsorbing ef- ficiency were 100% and great than 80% respectively when HA beginning concentration less than 20 mg/L and at range of 20-40 mg/L. The MWCNT-polyurethane foam was a new and high efficiency sorbent, it had very high adsorbing efficiency for HA in natural water at acidic condition. The pattern of MWCNT--polyurethane foam absorbing HA fits well with Langmuir formula.