In this work, a pre-wetting induced superhydrophilic/superlipophilic micro-patterned membrane with surface-loaded BiVO 4 nanoparticles (Bi/PDA@PT) was successfully prepared by electrospinning and polydopamine (PDA) surface modification technology for highly efficient emulsified oily wastewater separation. The results showed that the as-prepared membranes exhibited micro hole-patterned structures and the BiVO 4 nanoparticles were uniformly deposited on the surfaces of fibers to construct hierarchical porous structures by using PDA as an adhesive polymeric bridge. During the separation process of emulsified oily wastewater, the hierarchical porous structures in membranes significantly improved the separation flux, which was nearly 2–3 times than that of the non-patterned membranes. Based on the existence of PDA, the membranes exhibited prewetting-induced superoleophobicity under water and superhydrophobicity under oil, which made it possible for them to separate both water-in-oil and oil-in-water emulsified oily wastewater selectively and efficiently. Moreover, the BiVO 4 nanoparticles loaded on the membranes could degrade the oily contaminants adsorbed on the membranes (nearly 100%) under visible light. All these attractive features demonstrate that the Bi/PDA@PT membranes show a great potential for sustainable and efficient emulsified oily wastewater separation.
Huilin Hou,Huabing Liu,Fengmei Gao,Minghui Shang,Lin Wang,Linli Xu,Wai-Yeung Wong,Weiyou Yang
Constructing semiconductor heterojunction with optimal structure and composition is highly desired to maximize the solar light utilization for photoelectrochemical (PEC) water splitting. Here, we reported the fabrication of BiVO 4 @ZnO heterojunction with a novel nanostructure for PEC water splitting via foaming-assisted electrospinning and subsequent atomic layer deposition (ALD) techniques. In such BiVO 4 @ZnO heterojunction , the isolated BiVO 4 nanoparticles were packaged within the ZnO microbelt matrix. During PEC water splitting, the BiVO 4 acts as the primary light absorber for wider solar spectral harvesting, and the ZnO prompts the transfer of the photo-excited high-energy electrons, which would render them with prolonged lifetime and enhanced separation of the photogenerated charge carriers. In addition, the microbelts architecture with a hollow channel can also effectively improve the interfacial charge separation and transportation. Accordingly, the PEC performances of BiVO 4 @ZnO hybrid microbelts were significantly enhanced with a photocurrent density up to ∼0.46 mA cm −2 (at 1.23 V vs. reversible hydrogen electrode (RHE) under simulated sunlight illumination), which is 15.3 times to that of pure BiVO 4 counterpart (∼0.03 mA cm −2 ). The photocurrent density of the BiVO 4 @ZnO electrode can be further increased to 1.07 mA cm −2 at 1.2 V vs. RHE by adding hole scavenger (NaSO 3 ) in the electrolyte solution under AM 1.5 G irradiation.
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