水铁矿吸附磷酸根的影响因素

为了修复水体富营养化，选取了人工合成的水铁矿作为除磷吸附剂。通过批量实验研究了震荡速度、吸附时间、吸附剂投加量、溶液初始pH、含磷初始浓度、反应温度和共存离子等因素对吸附作用的影响。结果表明：水铁矿的吸附具有快速吸附，缓慢平衡的特点；随着投加量的增加，溶液中磷酸根的去除率逐渐增加；溶液初始pH在酸性条件下，溶液中磷酸根的去除率最好；在室温25 ℃下，水铁矿对不同浓度的磷酸根溶液均具有很好的吸附效果；溶液共存离子的存在对磷酸根去除率有一定影响，HCO3-的影响最大。

Influence factors of ferrihydrite adsorbing phosphate radical

Synthetic ferrihydrite was selected as phosphorus absorbent to optimize eutrophication. Batch experiments were carried out to study the effects of shock velocity, adsorption time, sorbent dosage, initial solution pH, initial phosphorus concentration, reaction temperature, and coexisting ions on the adsorption process. We found that ferrihydrite adsorption was rapid and that equilibrium was slow. Upon increasing the dosage, phosphate removal increased gradually. In addition, use of an acidic initial pH was optimal for removal of the phosphate radical from solution. Furthermore, at 25 ℃, the ferrihydrite exhibited good phosphate adsorption at a range of concentrations. Finally, the presence of foreign ions had a significant impact on the removal rate of phosphate, as with an increase in HCO3- concentration, the maximum phosphate radical removal rate was reached.