连续进水模式下电容去离子技术除氟研究  

Study on fluorides-removal by capacitive deionization with single-pass mode

作　　者：杨帆 张峰[1] 王东升 李红艳[1] 崔佳丽[1] 王朝旭[1] 崔建国[1] YANG Fan;ZHANG Feng;WANG Dong-sheng;LI Hong-yan;CUI Jia-li;WANG Chao-xu;CUI Jian-guo(College of Environmental Science and Engineering,Taiyuan University of Technology,Jinzhong 030600,China)

机构地区：[1]太原理工大学环境科学与工程学院,山西晋中030600

出　　处：《现代化工》2022年第1期105-110,共6页Modern Chemical Industry

基　　金：山西省自然科学基金资助项目(201801D121275);山西省社会发展科技攻关项目(201803D31046,201803D31050)。

摘　　要：采用连续进水模式电容去离子技术(CDI)进行除氟研究,探讨了原水质量浓度、电压、流速、pH、共存离子、离子交换膜对除氟的影响,通过动力学分析探讨了其去除机理,并考察了电极的再生性能。结果表明,在原水质量浓度为50 mg/L、电压为1.5 V、流速为7 mL/min的条件下,电极吸附量可以达到3.17 mg/g。原水质量浓度越高、电压越大,电极的吸附量就越高。撤去电压电极即可高效再生,5次循环后,电极吸附能力可保持86%。离子交换膜可有效减弱pH波动,提高电极再生性能,但吸附量降低。连续进水模式下CDI除氟过程遵循准一级动力学模型,吸附速率与剩余电容成正比。Single pass mode capacitive deionization(CDI) is employed to remove fluorides.The effects of feed water concentration, voltage, flow rates, pH, coexisting ions and ion exchange membrane on removal of fluorides are discussed.The removal mechanism is discussed through kinetic analysis, and the regeneration performance of the electrode is investigated.The results show that the adsorption capacity can reach 3.17 mg·g^(-1) when the fluorides concentration in feed water is 50 mg·L^(-1),voltage is 1.5 V and the flow rate of feed water is 7 mL·min^(-1).The higher the fluoride concentration in feed water and the voltage, the higher the specific adsorption capacity of the electrode.After 5 cycles, the adsorption capacity of the electrode can remain 86%.The ion exchange membrane can effectively reduce pH fluctuation and improve the regeneration performance of electrode, but the adsorption capacity is therefore reduced.CDI fluoride removal process in single pass mode follows a pseudo-first-order kinetic model, and the adsorption rate is proportional to the residual capacitance.

关 键 词：电容去离子(CDI) 连续进水模式 除氟 膜电容去离子(MCDI) 电极再生 

分 类 号：X523[环境科学与工程—环境工程]