水合氧化镧吸附除磷的试验研究

以开发新型高效除磷吸附剂材料为目的,以金属水合氧化物MeH(metal hydrate)为试验对象,对所选材料进行了吸附除磷性能评价.通过对多种水合金属氧化物吸附除磷性能的比较研究,发现水合氧化镧LaH(lan-thanum hydrate)具有优异的除磷吸附容量,其吸附容量大约为参照物粉末活性氧化铝的十几倍.该吸附剂的吸附容量随pH值变化显著,在pH=3附近达最大值;吸附等温线较符合Langmuir方程;进行了抗无机阴离子干扰能力测试,给出了干扰离子的影响顺序;该吸附剂对正磷酸根的去除性能优越,但对聚磷酸根的去除效果不理想.试验结果表明,水合氧化镧在平衡吸附容量、pH适应范围等方面与参照物活性氧化铝相比较,具有优异的性能.

Removal of Phosphorus from Aqueous Solution by Lanthanum Hydrate

Aiming at the development of novel efficient adsorbents for phosphorus removal from wastewater, metal hydrates (MeH) were selected as adsorbent material. Several kinds of MeH were tested for phosphorus adsorption, and lanthanum hydrate (LaH) was found to possess a high adsorption capacity. Corresponding to solution pH change, LaH's adsorption capacity changed largely, and at about pH=3 reached the peak. Its adsorption isotherm accorded prefer Langmuir's to Fruendrich's equations. Influences of different anions on its adsorption capacity were tested. This adsorbent was effective to adsorb orthophosphate but limited to remove polyphosphoric anion. The experimental results demonstrated that the LaH adsorbent was superior to traditional activated alumina adsorbent in adsorption performance.