蜂巢石对水中正磷酸盐的吸附性能

Adsorption Performance of Pumice to Orthophosphate in Water

该文研究了不同初始浓度、温度和振荡时间条件下蜂巢石矿物质对水中正磷酸盐的吸附行为。结果表明在蜂巢石投加量不变的情况下,蜂巢石对低浓度正磷酸盐有较强的吸附能力,平均吸附率达45%;蜂巢石对正磷酸盐的吸附在10 min时达到最大吸附量,体现了快速吸附的特点;该反应是吸热反应,蜂巢石对正磷酸盐的去除率随着温度的升高而增加;正磷酸盐在蜂巢石中易于脱附,2 h内的脱附量可达93%;蜂巢石对正磷酸盐的吸附行为符合Langmuir和Freundlich吸附等温式拟合,RL值和1/n值表现为优先吸附,且其吸附兼有物理吸附及化学吸附两种作用。

Adsorption behavior of pumice to orthophosphate in sewage treatment under the condition of various factors such as concentration of phosphate, temperature and contact time was studied. Experimental results indicate that the adsorption ability is high if concentration of orthophosphate is low with the same pumice dosage, and the average adsorption rate can reach 45 % ; the adsorption quantity to orthophosphate reaches its maximum at 10 minutes, which represents the characteristics of fast adsorption. The removal rate of orthophosphate increases with the increasing of temperature. The orthophosphate is easy to desorb in pumice, and desorption amount can reach 93 % in 2 hours. The adsorption pattern can be fitted well by Langmuir and Freundlich equations. RL and 1/n assume preferential adsorption; meanwhile, the process includes physical and chemical adsorption.