HDTMAB改性粉煤灰对水体中磷的吸附特性

Characteristics of Adsorption of Phosphorus from Wastewater onto HDTMAB Modified Fly Ash

制备了十六烷基三甲基溴化铵(HDTMAB)改性粉煤灰,研究了该改性粉煤灰对水体中磷的吸附特性,结果表明:①当HDTMAB负载量为10%时,改性粉煤灰吸附磷酸盐的效果最佳;②改性粉煤灰对磷酸盐的吸附速度很快,20min可达吸附平衡;③改性粉煤灰对磷酸盐的吸附行为能较好地符合Langmuir等温吸附模型和Freundlich等温吸附模型,但在Freundlich模式下表现为两个线性区;④pH对改性粉煤灰吸附磷酸盐的性能有显著影响,随着pH的升高对磷酸盐的吸附能力逐渐增加。

Hexadecyl-trimethyl- ammonium bromide （HDTMAB） modified fly ash was prepared in this paper. An investigation was carried out on the efficiency and mechanism for the adsorption of phosphate onto the modified fly ash. The results showed that when HDTMAB loading was 10%, the effect of phosphate sorption onto the modified fly ash was the best. The rate of phosphate sorption onto the modified fly ash was very fast, and it took only 20 min to get adsorption equilibrium. The adsorption behaviors accorded with the Langmuir sorption isotherm and Freundlich sorption isotherm. However, the adsorption isotherm data appeared as two distinct linear regions in Freundlich model. The effect of phosphate sorption was also affected by pH value of the solution, with the increase of pH value, the capacity of phosphate sorption was gradually increasing.