In this study, both CuO nanoparticles and ZnO nanorods were anchored on thermally-exfoliated g-C3N4 nanosheets (denoted as CZ@T-GCN) via isoelectric point-mediated annealing process as a novel nano-photocatalyst towards degradation of amoxicillin (AMOX). The features of prepared materials were characterized using BET, UV–vis DRS, XRD, FT-IR, XPS, FE-SEM, TEM, EIS and transient photocurrent techniques. These analyses demonstrated the successful formation of heterojunctions between components of CZ@T-GCN nanocomposite, which reflected in significantly increased electron-hole separation and enhanced degradation of AMOX as compared with pure substances. The investigation of influential operative parameters confirmed that the complete removal of AMOX could be attained under catalytic dosage of 0.9 g L−1 and pH of 7.0 within 120 min simulated sunlight illumination. Generation of OH upon illumination of catalysts was verified by terephthalic acid photoluminescence (TPA-PL) spectroscopy. Also, trapping tests proved that OH and O2 − were the major reactive radicals in AMOX decontamination. A novel double Z-scheme mechanism as well as a tentative pathway for fractionation of AMOX by CZ@T-GCN photocatalytic system were proposed in details. Only a marginal decrease in photocatalytic activity occurred after 5 consecutive tests. In an attempt to study the industrial applicability of catalyst, more than 79 % COD and 63 % TOC were eliminated under optimum conditions during 120 min illumination and the biodegradability of treated wastewater was also improved.

CuO and ZnO co-anchored on g-C3N4 nanosheets as an affordable double Z-scheme nanocomposite for photocatalytic decontamination of amoxicillin

Inadequate separation of carriers is still major obstacles to the practical application of photocatalysis. The reasonable design of semiconductor photocatalysts is expected to break through this bottleneck. Herein, MoSe2@Bi2S3/CdS is designed by solvothermal-hydrothermal strategy. Thanks to the dual Z-Scheme heterojunction conforms to the characteristics of multi-channel charge transfer which favor the spatial separation of carriers. MoSe2@Bi2S3/CdS hollow structure increases the utilization rate of light source, the core-shell structure increases the interface area and the active sites. Moreover, full spectrum absorption endues MoSe2@Bi2S3/CdS with unpredictable photothermal effect, which can touch off near-field temperature rise to facilitate photocatalytic process. Profiting from the synergistic facilitation effect, MoSe2@Bi2S3/CdS exhibits excellent photocatalytic activity in the hydrogen evolution and pollutants removal of Cr (VI) and 2,4,6-trichlorophenol (TCP), which are up to 11.84 mmol/g/h, 98.7% and 99.2%, respectively. This dual functional MoSe2@Bi2S3/CdS photocatalyst may paves new opportunities for solving the energy crisis and environmental pollution.

Hollow MoSe2@Bi2S3/CdS Core-Shell Nanostructure as Dual Z-Scheme Heterojunctions with Enhanced Full Spectrum Photocatalytic-Photothermal Performance

A symmetric double Z-scheme BiFeO3/CuBi2O4/BaTiO3 with enhanced solar photocatalytic performance was fabricated, and employed in the photodegradation of norfloxacin. The photocatalytic performances of BiFeO3/CuBi2O4/BaTiO3, BiFeO3, CuBi2O4 and BaTiO3 were compared. Also, the mechanism on the symmetric double Z-scheme BiFeO3/CuBi2O4/BaTiO3 photocatalytic system was proposed. The results display that BiFeO3/CuBi2O4/BaTiO3 has more superior photocatalytic performance, which results from the construction of the symmetric double Z-scheme photocatalyst. Its light absorption range is extended to UV-vis and near-infrared (NIR) light, which effectively utilizes the whole solar light spectrum. Especially, the large VB oxidation surface of this composite photocatalyst promotes e--h+ separation and improves the oxidation-reduction ability. Also, BiFeO3/CuBi2O4/BaTiO3 can be recycled with superior stability for 5 cycles. Furthermore, in the photodegradation, the h+ and •OH play major roles, while the •O2− plays little role. Hence, the BiFeO3/CuBi2O4/BaTiO3/solar light technology has great application prospects in the treatment of contaminated wastewater with antibiotics.

Construction of novel symmetric double Z-scheme BiFeO3/CuBi2O4/BaTiO3 photocatalyst with enhanced solar-light-driven photocatalytic performance for degradation of norfloxacin

Recent advances of melamine self-assembled graphitic carbon nitride-based materials: Design, synthesis and application in energy and environment

Bi spheres SPR-coupled Cu2O/Bi2MoO6 with hollow spheres forming Z-scheme Cu2O/Bi/Bi2MoO6 heterostructure for simultaneous photocatalytic decontamination of sulfadiazine and Ni(II)

Construction of novel Z-scheme Ag/ZnFe2O4/Ag/BiTa1-xVxO4 system with enhanced electron transfer capacity for visible light photocatalytic degradation of sulfanilamide.

The invention relates to a composite double-Z-shaped photocatalyst BiFeO3/CuBi2O4/BaTiO3, and a preparation method and application thereof, the BiFeO3/CuBi2O4/BaTiO3 preparation method includes the following steps of dissolving BiFeO3 powder, CuBi2O4 powder and BaTiO3 powder in deionized water according to the molar ratio of 1:2:1, fully stirring the deionized water, boiling the deionized water for 30 minutes, and performing complete drying and grinding at the temperature of 80 DEG C; performing calcination in a muffle furnace at the temperature of 280 DEG C for 3 hours, and performing grinding to obtain the BiFeO3/CuBi2O4/BaTiO3 composite catalyst, the composite catalyst can be used for efficient photocatalytic degradation of antibiotics under the action of sunlight

Composite double-Z-shaped photocatalyst BiFeO3/CuBi2O4/BaTiO3, and preparation method and application thereof

The invention relates to a symmetrical reverse-Z-type photo-catalyst, a preparation method and an application thereof. The method includes: 1) synthesizing ZnIn2S4 and CaIn2S4 through hydrothermal method and synthesizing ZnTiO3 and Er3+: Y3Al5O12 through a sol-gel process; 2) according to certain mass ratio, adding the Er3+: Y3Al5O12 to ZnTiO3 sol to finally obtain an Er3+: Y3Al5O12 @ ZnTiO3 composite; 3) because the materials have different isoelectric points, regulating pH value to a certain range, and calcining the materials to prepare the ZnIn2S4/Er3+: Y3Al5O12 @ ZnTiO3/CaIn2S4 photo-catalyst. The symmetrical reverse-Z-type photo-catalyst, ZnIn2S4/Er3+: Y3Al5O12 @ ZnTiO3/CaIn2S4, can degrade organic pollutants under simulative sunlight irradiation and prepare hydrogen at the same time.The photo-catalyst, by using the pollutants as a recyclable energy resource, achieves double objects of environment treatment and clean energy production.

Zhang Xingyuan

Papers

Construction of novel symmetric double Z-scheme BiFeO3/CuBi2O4/BaTiO3 photocatalyst with enhanced solar-light-driven photocatalytic performance for degradation of norfloxacin

Construction of novel Z-scheme Ag/ZnFe2O4/Ag/BiTa1-xVxO4 system with enhanced electron transfer capacity for visible light photocatalytic degradation of sulfanilamide.

Composite double-Z-shaped photocatalyst BiFeO3/CuBi2O4/BaTiO3, and preparation method and application thereof

Symmetrical reverse-Z-type photo-catalyst, preparation method and application thereof