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通过颗粒溶胶路线合成三元SiO2-TiO2-ZrO2溶胶,在中空平板陶瓷载体上采用溶胶-凝胶法制备了纳滤膜,用于双氯芬酸钠(DCF)水溶液的分离。考察了盐酸用量和溶胶浓度对溶胶粒径的影响,发现增大盐酸用量,降低溶胶浓度均可有效降低溶胶粒径。本实验还探究了煅烧温度对溶胶凝胶化后的影响,发现SiO2-TiO2-ZrO2凝胶经过550℃煅烧后仍保持无定型态,表明其优异的热稳定性。在DCF的分离实验中,分别经过300℃和550℃两种不同煅烧温度制备的M-300和M-550纳滤膜通量均随着操作压力的增加而增大,而水渗透率基本保持不变,并且截留率分别达到99.7%和97.8%以上;当料液温度从25℃升至70℃(0.6MPa)时,M-300和M-550纳滤膜通量分别提高了5倍和3.33倍,且对DCF的截留率保持在99.1%和96.4%以上,这说明所制备的SiO2-TiO2-ZrO2纳滤膜对DCF水溶液具有优异的分离性能和水热稳定性。
Abstract：Ternary sols of SiO2-TiO2-ZrO2 were synthesized by a colloidal sol route, then nanofiltration membranes were prepared via a sol-gel method by coating the sols on hollow flat ceramic supports and applied for the separation of diclofenac sodium(DCF) aqueous solution.The effects of hydrochloric acid content and concentration of sols on particle size of sols were investigated. As a result, larger hydrochloric acid content and smaller sol concentration could reduce sol particle size effectively. Through the calcination temperature research on sol gelating effect, the synthesized SiO2-TiO2-ZrO2 gel which remained amorphous after calcination at 550℃, which showed an excellent thermal stability. In the DCF separation experiment, the flux of M-300 and M-550 calcined at 300℃ and 550℃ increased with the increase of operating pressure, while the water permeability was almost constant, and rejection reached to above 99.7% and 97.8%, respectively. When feed temperature increased from 25℃ to 70℃(0.6MPa),the flux of M-300 and M-550 nanofiltration membranes increased by 5 times and 3.33 times with the rejection of DCF remains above 99.1% and 96.4%, indicating the excellent separation performance and hydrothermal stability of the SiO2-TiO2-ZrO2 nanofiltration membranes for DCF aqueous solution separation.
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基本信息:
DOI：10.16026/j.cnki.iea.2022030242
中图分类号:X703;TQ051.893
引用信息:
[1]夏凌云,任秀秀,徐荣,等.SiO_2-TiO_2-ZrO_2陶瓷纳滤膜的制备及性能研究[J].离子交换与吸附,2022,38(03):242-252.DOI:10.16026/j.cnki.iea.2022030242.
基金信息:
江苏省自然科学基金资助项目基金(No.BK20200982); 常州市科技计划(CE20225057); 常州市应用基础(CJ20220140); “江苏省教育厅国际合作联合实验室”资助项目