Ca-Fe基磁性纳米复合材料对水体中磷的结晶回收  

Crystallization recovery of phosphorus from water by Ca-Fe based magnetic nanocomposites

作　　者：于生慧 王艳 张元诏 冯馨怡 郭军康 张蕾 YU Shenghui;WANG Yan;ZHANG Yuanzhao;FENG Xinyi;GUO Junkang;ZHANG Lei(School of Environmental Science and Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)

机构地区：[1]陕西科技大学环境科学与工程学院,西安710021

出　　处：《环境工程学报》2023年第9期2937-2948,共12页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金青年资助项目(41702038);陕西省自然科学基金(2019JM-375);陕西省科技创新团队项目(2022TD-09);陕西省重点产业链项目(2022ZDLNY02-02)。

摘　　要：人类活动导致大量的不可再生的磷资源流失到水环境中造成水体富营养化,磷的结晶回收对废水治理、地表水管理和可持续发展具有重要意义。采用微波-冷却-回流和超声的方法制备Ca-Fe基磁性纳米复合材料(CaCO_(3)-Fe_(3)O_(4)),通过批量吸附实验法系统探究了体系pH、接触时间、磷的初始浓度、共存离子等因素对复合材料去除水体中磷的影响规律。结果表明,CaCO_(3)-Fe_(3)O_(4)纳米磁性复合材料在pH=3.0~6.0内对磷表现出良好的去除效果,对磷的最大去除容量为189.21 mg·g^(−1)。复合材料对水体中的磷主要通过吸附-结晶耦合机制去除,在高浓度含磷废水中,磷以CaHPO_(4)·2H_(2)O的形式被回收。综合考虑磁分离的简易性、磷的去除容量和环境友好性,所制备的Ca-Fe基磁性复合材料在磷资源回收领域具有潜在的应用价值。Human activities induced the loss of non-renewable phosphorus resources into aquatic environment,leading to eutrophication of waterbody.Crystallization recovery of phosphorus is crucial for wastewater treatment,surface water management and sustainable development.In this study,Ca-Fe based magnetic nanocomposites(CaCO_(3)-Fe_(3)O_(4))were synthesized by microwave-assisted reflux and ultrasound method.The effects of solution pH,contact time,initial phosphorus concentration,coexisting ions on phosphorus removal by magnetic nanocomposite were systematically examined by the batch adsorption method.The results demonstrated that the phosphate could be effectively recovered from water by CaCO_(3)-Fe_(3)O_(4)nanocomposites in the pH range of 3.0~6.0,and the maximum removal capacity of 189.21 mg·g^(−1)(P).The phosphate was removed via sorption-crystallization coupling mechanism,and in high phosphate concentration effluent,P was harvested in a CaHPO_(4)·2H_(2)O form.Considering the easy magnetic separation,high phosphorus removal capacity and environmental friendliness,the prepared Ca-Fe based magnetic composites have potential applications in phosphorus resource recovery.

关 键 词：方解石 磁性纳米复合材料 磷 吸附 结晶回收 

分 类 号：X703[环境科学与工程—环境工程]