竹炭对苯胺的吸附特性

研究竹炭对水溶液中苯胺的吸附特性,包括接触时间、pH值、吸附剂质量、吸附温度及溶液中苯胺的初始浓度对吸附的影响.结果表明;吸附平衡时间为360 min;在pH值4.0～6.4的Hae-NaAc缓冲体系中,竹炭对苯胺有较高的吸附能力,其中最佳吸附酸度为pH=5.90;当苯胺的初始浓度为0.060 mg·mL-1时,平衡吸附量为44.5mg·g-1,竹炭能有效地除去水相中的苯胺;随着温度的升高,吸附量增大,说明吸附过程是一个放热过程;竹炭对苯胺的吸附行为服从Freundlich吸附等温方程式;在0.8 mol·L-1H2SO4中,对使用过的竹炭采用微波加热处理法进行再生,竹炭的吸附能力恢复到原来的97%.竹炭有望成为除废水中苯胺的吸附材料.

Adsorption Property of Aniline on Bamboo-Charcoal

The adsorption property of aniline on hambeo-charcoal was studied in aqueous solution. Parameters such as contact time, pH, mass of absorbent, adsorption temperature, and initial concentration of aniline in solution were also studied. The result shows that adsorption equilibrium time is 360 min. The hamboo-charcoal showed high adsorption ability for aniline at a wide pH range(pH 4.0 ～ 6.4), the optimized adsorption acidity of bamboo-charcoal for aniline is pH 5.90 in HAc-NaAc medium. As initial concentration of aniline is 0.060 mg·mL-1, the equilibrium adsorption amounts is 44.5 mg·g- 1. The aniline can be removed from aqueous solution effectively with hambeo-charcoal. As the adsorption temperature increases, the adsorption decrease. And it has been proved that the adsorption process is an exothermic process. The adsorption behavior of bambeocarbon for aniline obeys the Freundlich isotherm model. The used bamboo-charcoal is treated with microwave by heating in 0.8 mol·L-1 H2SO4, the adsorption ability can be regenerated to 97% . As absorptive material, the bamboo-charcoal can be applied to remove aniline from wastewater.