| 泡沫浮选耦合膜过滤回收有机废水中纳米TiO2光催化剂的工艺 |
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| 引用本文： | 徐艳艳,刘伟,舒婷,李娜,吴兆亮.泡沫浮选耦合膜过滤回收有机废水中纳米TiO2光催化剂的工艺[J].化工进展,2019,38(10):4773-4779. |
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| 作者姓名： | 徐艳艳 刘伟 舒婷 李娜 吴兆亮 |
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| 作者单位： | 河北工业大学化工学院,天津,300131;河北工业大学化工学院,天津,300131;河北工业大学化工学院,天津,300131;河北工业大学化工学院,天津,300131;河北工业大学化工学院,天津,300131 |
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| 基金项目： | 河北省重点基础研究计划(16964002D) |
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| 摘 要： | 本研究的目的是开发一种新型的泡沫浮选耦合超滤技术的方法，以实现从有机废液体系中经济、高效地回收纳米TiO2光催化剂。首先，对超滤膜分离有机废液中纳米TiO2光催化剂的使用效率，包括透过通量和截留率进行评价。随后，为了减少超滤操作进料液中纳米TiO2光催化剂的浓度，在泡沫浮选阶段确定以阳离子表面活性剂——十六烷基三甲基溴化铵（CTAB）作为捕获剂，研究了CTAB浓度、气体体积流速、分布器孔径对泡沫浮选回收纳米TiO2光催化剂富集效率的影响。最后，确定泡沫浮选耦合超滤耦合回收纳米TiO2光催化剂的工艺条件。试验结果表明，采用耦合工艺，在pH 7.0、CTAB浓度0.20g/L、气体体积流速15mL/min以及分布器孔径180μm的条件下，纳米TiO2光催化剂富集比和回收率分别为22.52和99%，同时膜的使用寿命较非耦合操作提高了133％。
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| 关 键 词： | 泡沫 浮选 纳米粒子 表面活性剂 超滤 |
| 收稿时间： | 2019-01-09 |
Recovery of nano-sized TiO2 photocatalyst from its organic wastewater by using a technology of froth flotation coupled with ultrafiltration |
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| Yanyan XU,Wei LIU,Ting SHU,Na LI,Zhaoliang WU.Recovery of nano-sized TiO2 photocatalyst from its organic wastewater by using a technology of froth flotation coupled with ultrafiltration[J].Chemical Industry and Engineering Progress,2019,38(10):4773-4779. |
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| Authors: | Yanyan XU Wei LIU Ting SHU Na LI Zhaoliang WU |
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| Affiliation: | School of Chemical Engineering, Hebei University of Technology, Tianjin 300131, China |
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| Abstract: | A novel technology of froth flotation coupled ultrafiltration has been developed for recovering nano-sized TiO2 photocatalyst from its organic wastewater. First, the ultrafiltration efficiency for the recovery of nano-sized TiO2 photocatalyst was evaluated according to the permeate flux and the rejecting ratio. Second, in order to reduce the concentration of the feeding solution, froth flotation was performed with cetyltrimethylammonium bromide (CTAB) as the collector. The effects of CTAB concentration, volumetric air flow rate and pore diameter of gas distributor on the performance of froth flotation were investigated. Finally, the suitable operation conditions of the proposed technology were determined. The experimental result showed that under the suitable operation conditions of pH 7.0, CTAB concentration 0.20g/L, volumetric air flow rate 15mL/min, and pore diameter of gas distributor 180μm, the enrichment ratio and the recovery percentage of nano-sized TiO2 photocatalyst reached 22.52 and 99%, respectively. Meanwhile, the operating time of the membrane increased by 133% compared to that in ultrafiltration only operation. |
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| Keywords: | foam flotation nanoparticles surfactants ultrafiltration |
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