Abstract
In order to effectively clean oily seawater with anionic polyacrylamide (APAM), UiO-66 coated γ-Al2O3 (UA) composites were firstly synthesized using γ-Al2O3 as a template to induce the growth of high hydrophilic UiO-66 on its surface to form a uniform UA self-assembled membrane. The UA composites and self-assembled membrane were characterized and analyzed. Also, the membrane performance was investigated. The results show that the hydrophilicity of particles is enhanced with the water contact angle decreasing from 39.8° (γ-Al2O3 particles) to 26.2° (UA composites) by introducing the UiO-66 coating. Moreover, the UA self-assembled membrane performs attractive water yield and separation performance. The oil concentration in the permeate treated by the first class of UA self-assembled membrane declines apparently from 91.22 to 18.90 mg L−1, while the water yield is as high as 657.89 L m−2 h−1. The reclaimed separation experiments show that the membrane materials could be recycled by calcination at 200 °C and hydraulic cleaning, which gives the material potential application in cleaning oily seawater.
Highlights
Ultra ltration (UF) membranes suffer from inherent hydrophobicity, membrane fouling and limited ux.[1,2] In particular, when treating oily seawater from oil elds, linear APAM molecules along with their carried oil droplets readily pass through a membrane channel.[3]
UiO-66 was coated on the surface of g-Al2O3 to obtain UiO-66 coated g-Al2O3 (UA) composites under optimal conditions
When the treatment classes reach 2, the oil concentration and SS are 7.70 and 2.69 mg LÀ1, respectively, which satisfy the standard of discharge and recycle in China (SY/T5329-94, concentration of oil # 8 mg LÀ1, SS # 3 mg LÀ1) and the oily seawater can be discharged directly into the environment
Summary
Ultra ltration (UF) membranes suffer from inherent hydrophobicity, membrane fouling and limited ux.[1,2] In particular, when treating oily seawater from oil elds, linear APAM molecules along with their carried oil droplets readily pass through a membrane channel.[3] water quality of a membrane permeate would deteriorate. UF membranes would be severely fouled and damaged. Dynamic membranes (DM) are an emerging membrane that dynamically come into being in situ by ltering solutions containing either inorganic or organic materials through a porous substrate.[4,5] In contrast to conventional membranes, DM distinguishes itself by having high ux, satisfactory retention efficiency and convenient operation.[6] Once the membrane is severely fouled, the membrane layer can be removed, and a new membrane layer can be formed again. Application of DM is restricted due to the lack of functional groups, abundant material category, uniform spherical shape, appropriate particle size, uniform membrane and the state-of-art membrane technologies.[7]
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