Recent advances in metal-organic framework membranes for water treatment: A review.

Biochar (BC) has exhibited a great potential to remove water contaminants due to its wide availability of raw materials, high surface area, developed pore structure, and low cost. However, the application of BC for water remediation has many limitations. Driven by the intense desire of overcoming unfavorable factors, a growing number of researchers have carried out to produce BC-based composite materials, which not only improved the physicochemical properties of BC, but also obtained a new composite material which combined the advantages of BC and other materials. This article reviewed previous researches on BC and BC-based composite materials, and discussed in terms of the preparation methods, the physicochemical properties, the performance of contaminant removal, and underlying adsorption mechanisms. Then the recent research progress in the removal of inorganic and organic contaminants by BC and BC-based materials was also systematically reviewed. Although BC-based composite materials have shown high performance in inorganic or organic pollutants removal, the potential risks (such as stability and biological toxicity) still need to be noticed and further study. At the end of this review, future prospects for the synthesis and application of BC and BC-based materials were proposed. This review will help the new researchers systematically understand the research progress of BC and BC-based composite materials in environmental remediation.

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Review of organic and inorganic pollutants removal by biochar and biochar-based composites

Applications of water-stable metal-organic frameworks in the removal of water pollutants: A review.

Removal of organic compounds by nanoscale zero-valent iron and its composites.

With the fast development of industrialization and urbanization, large amounts of organic pollutants are released into the natural environment. The efficient elimination of organic pollutants is thereby crucial for environmental pollution treatment and human health. In the last decades, photocatalytic degradation of persistent organic pollutants has attracted multidisciplinary interest because of its simple operation on a large scale. However, the whole processes for the photocatalytic degradation of organic pollutants are still unclear. In this perspective, the contribution of reactive species, the contribution of photocatalysts, the analysis of intermediate products, the charge transfer and fast carrier recombination are discussed on biochar-based photocatalysts.

Challenges of organic pollutant photocatalysis by biochar-based catalysts

Bismuth oxychloride-based materials for the removal of organic pollutants in wastewater.

Aqueous hexavalent chromium (Cr(VI)) treatment and chromium resource recovery toward Cr-containing wastes are of significant importance and necessity to both wastewater remediation and resource recovery. Herein, via mild photoreaction conditions with isopropanol (IPA) as an electron donor, a catalyst-free strategy for aqueous Cr(VI) extraction to form an insoluble polyhydroxy Cr(V) complex is developed for the first time. Aqueous Cr(VI) with concentration from 5 to 150 ppm can be efficiently extracted with high selectivity even in the presence of coexisting ions, and the total Cr concentration in residue solution can be as low as 0.5 ppm. The Cr resource could be efficiently recovered as pure Cr2O3 by calcinating the resulting Cr(V) precipitate. Outstanding extraction efficiency could be realized with various IPA concentrations (1.3-12.0 mol/L) by coordinately tuning the pH value to promote the formation of Cr(VI)-IPA ester. The formed ester undergoes intramolecular electron transition under visible light irradiation, resulting in a polyhydroxy solid-state Cr(V) intermediate complex. The controlled pH value blocks further reduction of Cr(V) to soluble Cr(III); thus the insoluble Cr(V) intermediate complex is stabilized thermodynamically under ambient conditions. Because of its electric neutrality property and the strong intermolecule interaction via hydrogen bonds, a dioxo-bridged di-nuclear Cr(V) complex {Cr2(μ-O)2(OH)4[OCH(CH3)2]2} is finally precipitated as the main product. Satisfactory extraction and recovery of Cr from chromium-plating wastewater and discarded stainless steel verify that this approach is ideal for both one-step purification of Cr(VI)-containing wastewater and selective resource recovery from Cr-containing solid wastes in practical application.

Selective and Efficient Photoextraction of Aqueous Cr(VI) as a Solid-State Polyhydroxy Cr(V) Complex for Environmental Remediation and Resource Recovery.

Ling Yao

Papers

Bismuth oxychloride-based materials for the removal of organic pollutants in wastewater.

Selective and Efficient Photoextraction of Aqueous Cr(VI) as a Solid-State Polyhydroxy Cr(V) Complex for Environmental Remediation and Resource Recovery.

Cr(VI) detoxification and simultaneous selective recovery of Cr resource from wastewater via photo-chemical extraction using biomass.

Photochemically Triggered Self-Extraction of Uranium from Aqueous Solution Under Ambient Conditions

A review on photo-, electro- and photoelectro- catalytic strategies for selective oxidation of alcohols