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Smart candle soot coated membranes for on-demand immiscible oil/water mixture and emulsion switchable separation
Nanoscale ( IF 6.7 ) Pub Date : 2017-08-21 00:00:00 , DOI: 10.1039/c7nr04448h
Jian Li 1, 2, 3, 4, 5 , Zhihong Zhao 1, 2, 3, 4 , Dianming Li 1, 2, 3, 4 , Haifeng Tian 1, 2, 3, 4 , Fei Zha 1, 2, 3, 4 , Hua Feng 1, 2, 3, 4 , Lin Guo 5, 6, 7, 8, 9
Affiliation  

Oil/water separation is of great importance for the treatment of oily wastewater, including immiscible light/heavy oil–water mixtures, oil-in-water or water-in-oil emulsions. Smart surfaces with responsive wettability have received extensive attention especially for controllable oil/water separation. However, traditional smart membranes with a switchable wettability between superhydrophobicity and superhydrophilicity are limited to certain responsive materials and continuous external stimuli, such as pH, electrical field or light irradiation. Herein, a candle soot coated mesh (CSM) with a larger pore size and a candle soot coated PVDF membrane (CSP) with a smaller pore size with underwater superoleophobicity and underoil superhydrophobicity were successfully fabricated, which can be used for on-demand immiscible oil/water mixtures and surfactants-stabilized oil/water emulsion separation, respectively. Without any continuous external stimulus, the wettability of our membranes could be reversibly switched between underwater superoleophobicity and underoil superhydrophobicity simply by drying and washing alternately, thus achieving effective and switchable oil/water separation with excellent separation efficiency. We believe that such smart materials will be promising candidates for use in the removal of oil pollutants in the future.

中文翻译:

智能蜡烛烟灰涂层膜,用于按需不混溶的油/水混合物和乳液可切换的分离

油/水分离对含油废水的处理非常重要,包括不混溶的轻质/重质油水混合物,水包油或油包水乳液。具有灵敏的可湿性的智能表面受到了广泛的关注,特别是对于可控的油/水分离。然而,在超疏水性和超亲水性之间具有可切换的润湿性的传统智能膜仅限于某些响应性材料和连续的外部刺激,例如pH值,电场或光照射。在此,成功制备了孔径较大的蜡烛油烟涂层筛网(CSM)和孔径较小的蜡烛油烟涂层PVDF膜(CSP),它们具有水下超疏油性和底油超疏水性,可以分别用于按需不混溶的油/水混合物和表面活性剂稳定的油/水乳液分离。无需任何持续的外部刺激,只需交替干燥和洗涤即可在水下超疏油性和底油超疏水性之间可逆地切换膜的润湿性,从而实现有效且可切换的油/水分离,并具有出色的分离效率。我们相信,此类智能材料将有望在将来用于去除油污。从而以优异的分离效率实现有效且可切换的油/水分离。我们相信,此类智能材料将有望在将来用于去除油污。从而以优异的分离效率实现有效且可切换的油/水分离。我们相信,此类智能材料将有望在将来用于去除油污。
更新日期:2017-09-21
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