Nanostructured g-CN/BiVO composite films with an enhanced photoelectrochemical (PEC) performance have been fabricated via the facile electrospinning technique. The g-CN nanosheets can not only form heterojunctions with BiVO but also prevent the agglomeration of BiVO, helping the formation of nanostructures. The as-prepared g-CN/BiVO films exhibit good coverage and stability. The PEC performance of the g-CN/BiVO films is much more enhanced compared with that for individual BiVO films because of the enhanced electron-hole separation. The photocurrent density is 0.44 mA/cm for g-CN/BiVO films at 0.56 V in the linear sweep current-voltage test, over 10 times higher than that of individual BiVO films (0.18 mA/cm). The effects of the preparation conditions including the g-CN content, collector temperature, calcination temperature, and electrospinning time on the PEC performance were investigated, and the reasons for the effects were proposed. The optimal preparation condition was with 3.9 wt % g-CN content in the electrospinning precursor, 185 °C collector temperature, 450 °C calcination temperature, and 40 min electrospinning time. The excellent PEC performance and the facile preparation method suggest that the g-CN/BiVO films are good candidates in energy and environmental remediation area.

Flexible Cu–Al2O3 membranes with high Fenton catalytic performance have been fabricated via electrospinning technique.

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A simple, effective and environmental-friendly method was adopted for enhancing the photocatalytic activity of g-C3N4 in the reduction of aqueous Cr(Ⅵ) under visible-light irradiation. The enhancement was achieved via treatment of g-C3N4 in organic solvent with addition of NaOH particles by ultrasonic process for two hours.The results demonstrated that the treated g-C3N4 exhibited much higher photocatalytic activity than pristine g-C3N4 in the reduction of Cr(VI) . Under visible light irradiation for 120 min, the reduced ratios of Cr(VI) with the initial concentration of 50 mg/L in the presence of the treated g-C3N4and pristine g-C3N4 were 100% and 37.1%, respectively. With the addition of fulvic acid, Cr(VI) was efficiently removed at 40 min. Based on the characterization results of the structures and other physiochemical properties of the treated g-C3N4 and pristine g-C3N4 by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and UV Vis diffuse reflectance, the possible reasons responsible for the enhanced photocatalytic activity of the treated g-C3N4 were proposed. The yield and mechanism of different exfoliation methods were compared by semi-quantitative method.