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Preparation and their separation performance of La/Y doped silica membranes for dye wastewater treatment

Authors： ZHANG Huayu, LUO Fangying, JIANG Tingting, LI Chenhui, ZHANG Xiaoliang*

Units： (Institute of Advanced Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China)

KeyWords： silica membrane; rare earth; doped; dye wastewater

ClassificationCode：O613.72;TQ028.8

year,volume(issue):pagination： 2018,38(4):113-119

Abstract：

La/Y doped silica membranes without defect were successfully prepared by sol-gel method with 1,2-bis(triethoxysilyl)ethane (BTESE) as precursors. The properties of silica sols and gels, and morphology and hydrothermal stability of silica membranes were characterized by TG, FTIR, XRD and SEM. The influence of La/Y ratios and calcination temperature on the separation performance through these silica membranes were investigated in positively charged crystal violet and negatively charged Congo red dye wastewater solutions. The results showed that their separation performance was improved for La/Y doped silica membranes, compared with pure BTESE-SiO2 membrane. And La50Y50-SiO2 silica membranes exhibited the best separation performance, which were prepared with La/Y ratio as 50/50% and calcinated at 300 oC. Moreover, the permeated flux over 5.0 L/(m2·h) and rejection for dye molecules of 100% were obtained when the test were conducted with initial concentration of crystal violet at 5 mg/L and that of Congo red at 20 mg/L. The separation performance through the silica membrane in negatively charged Congo red solutions were higher than those in positively charged crystal violet solutions. There were synergistic mechanism of molecular sieving and electrostatic adsorption effect during the separation process for dyes wastewater treatment. In addition, the La/Y doped silica membranes also exhibited excellent salt tolerance, indicating that these membranes would be used in the high-efficiency separation for high salinity dye wastewater treatment.

Funds：

国家自然科学基金（21566012）；江西省杰出青年人才资助计划（20162BCB23025）；江西省自然科学基金（20171BAB203020）；江西师范大学研究生创新基金（YJS2017024）

AuthorIntro：

第一作者简介：张华宇（1992-），女，吉林省吉林市人，硕士，从事无机膜材料研究. *通讯作者，E-mail：xlzhang@jxnu.edu.cn

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