羟基磷灰石-聚乙烯醇复合剂处理含氟废水的研究

The Treatment of Fluoride-contianing Waste Water by Hydroxyapatite-polyvinyl-alcohol Composite

目的研究羟基磷灰石-聚乙烯醇复合剂降氟容量及影响因素.方法采用熔融共混法制备复合剂;用氟离子选择电极法测试降氟容量.结果 9%的羟基磷灰石-聚乙烯醇复合剂降氟容量为5.35 mg/g;pH=2～8时复合剂的降氟容量在4.5～5.4 mg/g间;浸泡60 min降氟容量达5.4 mg/g后趋于平衡.结论复合剂的降氟容量较高,且具有降氟成本低、高氟水在pH=2～8范围内不需调节pH值即可使用、耗时短的特点.

Objective To study the defluoridation capacity and influencing factors of the complex synthesized by hydroxyapatite and polyvinyl alcohol.Methods The complex of hydroxyapatite and polyvinyl alcohol was synthesized by melt-blending process as a defluoridator.Then the defluoridation capacity were determined by using ion-selective electrode under the national standards.Results The defluoridation capacity of the complex of 9% hydroxyapatite and 91% polyvinyl alcohol was 5.35 mg/g.The capacity in pH from 2 to 8 was 4.5-5.4 mg/g,and the capacity increased to 5.4 mg/g after 60 min soaking of the complex,then to retain the balance.Conclusion The complex has greater defluoridation capacity,lower costs,convenient operations,and is time-saving.