首页|Enhancing interfacial interaction of PDMS matrix with ZIF-8 via embedding TiO2@ZIF-8 composites for phenol extraction in aqueous-aqueous membrane extractive process
Enhancing interfacial interaction of PDMS matrix with ZIF-8 via embedding TiO2@ZIF-8 composites for phenol extraction in aqueous-aqueous membrane extractive process
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The presence of phenol as an organic pollutant in industrial effluents is the biggest threat to the aquatic environment and human health.The aqueous-aqueous extraction process is an attractive method to treat saline phenolic wastewater(feed solution)via diffusion through a semi-permeable polydimethylsiloxane(PDMS)to the receiving solution.To improve the value of mass transfer coefficient,thinning the PDMS layer and embedding it with nanoparticles/metal-organic frameworks(MOFs)can lead to membrane defects or weakened mechanical strength,which is not promising for large-scale practical applications.Therefore,herein,an interfacial design strategy is demonstrated to disperse TiO2@ZIF-8 composites as hybrid particles into the top selective layer(PDMS)of TFC(thin-film composite)membrane to enhance polymer-filler compatibility and mass transfer coefficient.The TiO2@ZIF-8 composites enhanced the affinity to the polymer matrix,thereby increasing the mechanical stability and preventing interfacial voids and agglomeration.Moreover,the TiO2@ZIF-8 incorporated TFC membranes exhibited an enhanced mass transfer coefficient(kQ)of(25.28 ± _(0.5))x 1CT7 and a reduced reverse salt flux of 9.5 mg/m~2.h.The enhanced mechanical stability and mass transfer coefficient were attributed to the synergistic effect provided by TiO2@ZIF-8 composites,as ZIF-8 particles provided continuous pathways(pore-flow mode)and TiO2 nanoparticles provided compactivity with PDMS.The synergistic effects of hybrid particles could provide a new strategy to develop PDMS for the extraction of various organic compounds.
PolydimethylsiloxaneHybrid particlesExtractive membranePhenolExtraction process
Mahmood Zarak、Saleem Atif、Xiaoting Meng
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School of Ecology and Environment,Northwestern Poly'technical University,Xi'an 710072,China
Frontiers Science Center for Flexible Electronics(FSCFE),Shaanxi Institute of Flexible Electronics(SIFE)& Shaanxi Institute of Biomedical Materials and Engineering(SIBME),Northwestern Polytechnical University,Xi'an 710072,China
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