Semiconductor assisted photocatalysis has attracted a pronounced attention owing to its vital role in environmental remediation. Effective light absorption, particularly in the visible region, and charge separation are the two most important factors affecting a photocatalytic system which is generally hard to be achieved by the bare photocatalysts. The blending of various semiconductor materials for the fabrication of heterojunction enhances the photocatalytic activity and stability by decreasing the rate of combination of electron-hole pairs. This review succinctly outlines the recent progress in the synthesis methods and the photocatalytic performances of semiconductor-semiconductor heterojunctions and semiconductor-carbon heterojunctions for degradation of pollutants like dyes, antibiotics, insecticides, herbicides, pesticides, and water splitting. The review ends with a summary and some future perspectives on this fast-emerging area of research.

Photodegradation of organic pollutants using heterojunctions: A review

A novel carbon nanotubes modified Bi12O17Cl2 composite (CNTs/Bi12O17Cl2) was prepared via hydrothermal method. The chemical structures, morphologies, optical properties of the synthesized samples were revealed by XRD, XPS, SEM, TEM, BET and UV-vis DRS measurements. The photocatalytic activity of the CNTs/Bi12O17Cl2 composite was evaluated with degradation reaction of rhodamine B (RhB) under visible light. CNTs/Bi12O17Cl2 exhibited improved photocatalytic activity in comparison with pure Bi12O17Cl2, and kept favorable stability and recyclability in the reaction. The relatively high photocatalytic activity of CNTs/Bi12O17Cl2 resulted from the enhanced separation efficiency of photo-induced charges, which were revealed by the photoluminescence spectra and transient photocurrent measurements. CNTs loaded at the surface of Bi12O17Cl2 sheets acted as electron carriers to efficiently transfer the photoinduced electrons, namely to promote the separation of photoinduced electrons and holes, thus improving the photocatalytic activity of the composite materials. At last, a possible photocatalytic reaction mechanism over the CNTs/Bi12O17Cl2 composite was proposed based on the results of trapping experiment, ESR measurements and the band energy analysis.

Enhanced photocatalytic activity of Bi12O17Cl2 nano-sheets via surface modification of carbon nanotubes as electron carriers.

Accelerated photocatalytic degradation of organic pollutants over carbonate-rich lanthanum-substituted zinc spinel ferrite assembled reduced graphene oxide by ultraviolet (UV)-activated persulfate

One-pot preparation of AgBr/α-Ag2WO4 composite with superior photocatalytic activity under visible-light irradiation

Photocatalytic degradation of Congo red dye using magnetic silica-coated Ag2WO4/Ag2S as Type I heterojunction photocatalyst: Stability and mechanisms studies

A novel BiOI/Ag2CO3 composite was synthesized through the co-precipitation method and well characterized by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, UV-vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. Its photocatalytic activity was evaluated for degrading various pollutants (rhodamine B, methylene blue, methyl orange) and phenol aqueous solution. Experimental results indicated that Ag2CO3 nanoparticles anchored on the BiOI sheet surface promoted the enhanced photocatalytic activity. Moreover, when the mass ratio of BiOI in BiOI/Ag2CO3 composites was 20%, the as-prepared BiOI/Ag2CO3 (20 wt%) composite exhibited the optimal photocatalytic activity for degrading rhodamine B; its rate constant was approximately 6.75 and 4.3 times higher than the separate BiOI and Ag2CO3. The enhanced photocatalytic performance could be attributed to the heterojunctions between BiOI and Ag2CO3. Furthermore, the possible mechanism for photodegradation over the BiOI/Ag2CO3 composite is proposed.

/pdf/highly-improved-visible-light-induced-photocatalytic-4dcdnthagw.pdf

Highly improved visible-light-induced photocatalytic performance over BiOI/Ag2CO3 heterojunctions

/pdf/synthesis-and-characterization-of-magnetic-organic-3g1irjde.pdf

Synthesis and characterization of magnetic organic montmorillonite: efficient adsorption of hexavalent chromium.

Failure to excrete ingested carriers could lead to the accumulation of substances, resulting in toxic reactions and disease. Herein, a novel ferrocenyl covalent organic framework (COF), denoted as Fc-COF, was designed as the platform for synergetic chemotherapy and enzymatic therapy. Specifically, the ferrocene unit endowed intrinsic enzymatic activity to the as-synthesized COF, which could convert the overexpressed H2O2 in the tumor microenvironment into toxic hydroxyl radicals (•OH). Meanwhile, Fc-COF with dynamic boroxine-linkage and hierarchical pore structure, simultaneously, could serve as an acid-responsive and biodegradable drug-delivery carriers for the loading of doxorubicin (DOX), which could minimize the drug leakage to the normal issues, thereby, realizing the tumor-selective targeted drug delivery. Noteworthily, both the in vitro and in vivo studies revealed the DOX loaded Fc-COF, i.e., Fc–COF–DOX, is a self-gated carrier for highly controlled drug delivery with excellent stability, good biodegradability, and high DOX loading capacity. It could not only effectively prolong the drug circulation time, but also selectively release DOX to the tumor sites, which could finely improve the drug accumulation in the tumor sites, avoiding the unwanted side effects caused via the undifferentiated drug release to the normal tissues, achieving selective chemotherapy. Together with the peroxide-like enzymatic therapy, an ideal synergistic tumor therapy for A549 non-small cell lung cancer (NSCLC), via the chemical therapy is achieved, whose therapeutic efficacy was improved remarkably in terms of joint antitumor efficiency in the tumor microenvironment (TME). This work provides an efficacious targeting treatment strategy for the combinational tumor therapeutic. 

A biodegradable ferrocene-based covalent organic framework as self-gated carrier for controlled drug delivery towards synergetic cancer enzymatic and chemical therapies

Abstract Hydrophobic TiO2/SiO2 (TiO2/HSiO2) membrane was fabricated by sol-gel method using methyltriethoxysilane as a precursor instead of partial tetraethylorthosilicate. The thermal stability of the composites was characterized by Fourier transform infrared spectra, X-ray diffraction, thermogravimetric-differential thermogravimetric analysis and N2 adsorption-desorption measurements. The H2 permeation and H2 permselectivity of TiO2/HSiO2 membrane were investigated by single gas permeance test. Calcination at about 350 ∼ 400 °C is suitable for preserving the hydrophobicity of the TiO2/HSiO2 membrane. The H2 permeance and H2 permselectivity in TiO2/HSiO2 membranes increased significantly with growing temperatures. At 200 °C and 0.4 MPa, the H2 permeance of TiO2/HSiO2 membrane is 7.27 × 10−6 mol·m−2·Pa−1·s−1 and the H2/CO2 and H2/N2 permselectivities are 7.68 and 10.09, respectively. In comparison to the HSiO2 membrane, the H2 permeances of TiO2/HSiO2 membrane increased by 71.56%, and the H2/CO2 and H2/N2 permselectivities increased by 23.07% and 24.11%, respectively. After steam treatment, the water absorption rate of TiO2/HSiO2 materials decreased by 33.17% relative to that of HSiO2 materials. TiO2/HSiO2 membrane has better hydrothermal stability and reproducibility than HSiO2 membrane.

Preparation, Characterization and Hydrothermal Stability of Hydrophobic TiO2/SiO2 Membrane

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Highly improved visible-light-induced photocatalytic performance over BiOI/Ag2CO3 heterojunctions

Synthesis and characterization of magnetic organic montmorillonite: efficient adsorption of hexavalent chromium.

A biodegradable ferrocene-based covalent organic framework as self-gated carrier for controlled drug delivery towards synergetic cancer enzymatic and chemical therapies

Preparation, Characterization and Hydrothermal Stability of Hydrophobic TiO2/SiO2 Membrane