Application of low-cost adsorbents for dye removal – A review

https://chemical.eng.usm.my/bassim/PDF/photocatalytic%20degradation.pdf

Parameters affecting the photocatalytic degradation of dyes using TiO2-based photocatalysts: a review.

Photoreduction of CO2 into sustainable and green solar fuels is generally believed to be an appealing solution to simultaneously overcome both environmental problems and energy crisis. The low selectivity of challenging multi-electron CO2 photoreduction reactions makes it one of the holy grails in heterogeneous photocatalysis. This Review highlights the important roles of cocatalysts in selective photocatalytic CO2 reduction into solar fuels using semiconductor catalysts. A special emphasis in this review is placed on the key role, design considerations and modification strategies of cocatalysts for CO2 photoreduction. Various cocatalysts, such as the biomimetic, metal-based, metal-free, and multifunctional ones, and their selectivity for CO2 photoreduction are summarized and discussed, along with the recent advances in this area. This Review provides useful information for the design of highly selective cocatalysts for photo(electro)reduction and electroreduction of CO2 and complements the existing reviews on various semiconductor photocatalysts.

Cocatalysts for Selective Photoreduction of CO2 into Solar Fuels.

Composite Photocatalysts Nan Zhang,†,‡ Min-Quan Yang,†,‡ Siqi Liu,†,‡ Yugang Sun,* and Yi-Jun Xu*,†,‡ †State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, P.R. China ‡College of Chemistry, New Campus, Fuzhou University, Fuzhou 350108, P.R. China Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States

Waltzing with the Versatile Platform of Graphene to Synthesize Composite Photocatalysts.

Replacement of part of the fossil fuel consumption by renewable energy, in particular in the chemical industry, is a central strategy for resource and energy efficiency. This perspective will show that CO2 is the key molecule to proceed effectively in this direction. The routes, opportunities and barriers in increasing the share of renewable energy by using CO2 reaction and their impact on the chemical and energy value chains are discussed after introducing the general aspects of this topic evidencing the tight integration between the CO2 use and renewable energy insertion in the value chain of the process industry. The focus of this perspective article is on the catalytic aspects of the chemistries involved, with an analysis of the state-of-the-art, perspectives and targets to be developed. The reactions discussed are the production of short-chain olefins (ethylene, propylene) from CO2, and the conversion of carbon dioxide to syngas, formic acid, methanol and dimethyl ether, hydrocarbons via Fischer–Tropsch synthesis and methane. The relevance of availability, cost and environmental footprints of H2 production routes using renewable energies is addressed. The final part discusses the possible scenario for CO2 as an intermediary for the incorporation of renewable energy in the process industry, with a concise roadmap for catalysis needs and barriers to reach this goal.

Catalysis for CO2 conversion: a key technology for rapid introduction of renewable energy in the value chain of chemical industries

The photocatalyst–enzyme coupled system for artificial photosynthesis process is one of the most promising methods of solar energy conversion for the synthesis of organic chemicals or fuel. Here we report the synthesis of a novel graphene-based visible light active photocatalyst which covalently bonded the chromophore, such as multianthraquinone substituted porphyrin with the chemically converted graphene as a photocatalyst of the artificial photosynthesis system for an efficient photosynthetic production of formic acid from CO2. The results not only show a benchmark example of the graphene-based material used as a photocatalyst in general artificial photosynthesis but also the benchmark example of the selective production system of solar chemicals/solar fuel directly from CO2.

A Photocatalyst–Enzyme Coupled Artificial Photosynthesis System for Solar Energy in Production of Formic Acid from CO2

In many developing countries, phosphate contamination from public and private wastewater disposal causes eutrophication of water bodies. The development and implementation of efficient, consistent and cost-effective techniques to remove phosphorus from wastewater is essential to restore and maintain ecological balance. In the present article, a new nanosized core/shell structure containing a magnetite (Fe3O4) core and mesoporous ZrO2 shell (Fe3O4@mZrO2) with a BET surface area of 107 m2 g−1 synthesized using an inexpensive synthesis protocol has been demonstrated as an efficient sorbent system for removal of phosphate. The mesoporous ZrO2 shell in the Fe3O4@mZrO2 imparts excellent adsorption capability for phosphate ions while the Fe3O4 core cooperates in easy and rapid magnetic separation. The developed system exhibits a phosphate adsorption capacity of up to ∼90% along with the dependency on the initial pH and initial P concentration of the experimental solution. Regeneration through the treatment with a KOH–KCl mixture allows Fe3O4@mZrO2 reuse.

/pdf/design-of-a-new-nanostructure-comprising-mesoporous-zro2-14mwtuu29m.pdf

Design of a new nanostructure comprising mesoporous ZrO2 shell and magnetite core (Fe3O4@mZrO2) and study of its phosphate ion separation efficiency

Enhanced photoactivity of visible light responsive W incorporated FeVO4 photoanode for solar water splitting

Depot de couches minces de sulfure de bismuth sur substrat en verre a 25°C a l'aide d'une solution de sel de Bi 3+ , de triethanolamine, NH 3 et thioacetamide

A Chemical Method for the Deposition of Bismuth Sulfide Thin Films

Different metal molybdates incorporated titanium dioxide were prepared by the chemical solution decomposition (CSD) method. Among many transition-metal molybdates, nickel molybdate incorporated titanium dioxide (NMTI) was found to be more photoactive than P25 TiO 2 and other metal molybdate doped TiO 2 (M x Mo x Ti 1− x O 6 ) (M = Ni, Cu, Zn; x  = 0.05), for photocatalytic oxidation of various dyes solution to harmless decolorized solution at room temperature with the help of Hg lamp. The prepared nano powders were characterized by XRD, UV–vis spectra, specific surface area (BET), UV–vis diffuse reflectance spectrum, EPR spectrum and TEM analyses. The average particle size of NMT1 was found to be 15 nm measured from TEM and calculated band gap from adsorption edge is found to be 2.66 eV.

Soumya Kanti Biswas

Papers

A Photocatalyst–Enzyme Coupled Artificial Photosynthesis System for Solar Energy in Production of Formic Acid from CO2

Design of a new nanostructure comprising mesoporous ZrO2 shell and magnetite core (Fe3O4@mZrO2) and study of its phosphate ion separation efficiency

Enhanced photoactivity of visible light responsive W incorporated FeVO4 photoanode for solar water splitting

A Chemical Method for the Deposition of Bismuth Sulfide Thin Films

Photocatalytic oxidation of organic dyes by nano-sized metal molybdate incorporated titanium dioxide (MxMoxTi1- xO6) (M = Ni, Cu, Zn) photocatalysts