Adsorptive removal of dyes from wastewater using a metal-organic framework: A review

\n\nThe huge quantity of wastewater, containing poisonous and hazardous dyes,\nis released by various industries which pollute water in direct and indirect ways. Most of the dyes are\na dangerous class of water contaminants which have affected the environment drastically. Some dyes\nsuch as congo red, rhodamine B, methylene blue, methyl violet, and crystal violet are a serious threat\nto human beings.\n\n\n\nNumerous methods are available for the removal of dyes from water.\nAdsorption, being a superior and eco-friendly technique, has advantage of eliminating organic dyes\nbecause of the availability of materials as adsorbents. The inexpensive nanomaterials are a more attractive\nchoice for remediation of various dyes due to their unique properties and offer an adequate\npathway to adsorb any organic dye from water to overcome its hazardous effects on human health.\n\n\n\nIn this review, we have discussed the latest literature related to various types of synthesis,\ncharacterization and uses as adsorbent for highly adsorptive removal capacity of nanoparticles for organic\ndyes.\n\n\n\nAdsorption technology provides an attractive pathway for further research and improvement\nin more efficient nanoparticles, with higher adsorption capacity, for numerous dyes to\neliminate the dyes discharged from various industries and thus reduce the contamination of water.\nTherefore, nanocomposites may contribute to future prospective water treatment process.\n

Nano-engineered Adsorbent for the Removal of Dyes from Water: A Review

Photocatalytic degradation of organic dyes in the presence of nanostructured titanium dioxide

Pollution of environmental waters and ecosystems is increasing. Adsorption is an effective technique for water decontamination, but is limited by the cost of commercial adsorbents such as activated carbon. Research has thus focused on the recycling and transformation of biowaste as low-cost, biodegradable adsorbents. In particular, banana peel is promising for commercial use due to its wide availability and efficiency. Here, we review the use of natural banana peel for the biosorption of pollutants from water. We discuss the factors controlling pollutants removal, and the regeneration and reuse of the biosorbent. pH of 5.0 to 7.0 is favorable for the removal of cationic pollutants, while pH of 2.0 to 4.0 is suitable for anionic pollutants. Generally, higher pollutant concentration induces lower removal, whereas higher banana peel dosage induces higher removal. Banana peel exhibits efficient removal of pollutants at various temperatures, with adsorption capacities mostly within 1–100 mg/g. Nitric acid is the most efficient eluent for heavy metal desorption from banana peel. Most studies showed efficient biosorbent reuse up to five cycles and above. We also discuss the thermodynamics, kinetics and isotherms of the adsorption process.

Banana peel as a biosorbent for the decontamination of water pollutants. A review

Z-scheme heterojunction nanocomposite fabricated by decorating magnetic MnFe2O4 nanoparticles on BiOBr nanosheets for enhanced visible light photocatalytic degradation of 2,4-dichlorophenoxyacetic acid and Rhodamine B

Correspondence Ashraf A. El-Bindary, Chemistry Department, Faculty of Science, Damietta University, Damietta 34517, Egypt. Email: abindary@yahoo.com Zinc oxide photocatalyst was synthesized through a low-temperature coprecipitation process using zinc sulfate as precursor for the degradation of Acid Red 57 (AR57) under UV irradiation. The activities of the prepared photocatalyst at different calcination temperatures (400, 500, and 600 C) were investigated. The synthesized zinc oxides were characterized by different techniques such as X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, N2 adsorption–desorption, and pH titration for the determination of the zero-point charge (pHZPC). The efficiency of photocatalytic degradation of ZnO prepared at the calcination temperatures of 400, 500, and 600 C was 90.03, 77.67, and 72.71%, respectively, after 190 min. The kinetics and scavengers of the reactive species during the degradation were also investigated. It was found that the degradation of AR57 fitted first-order kinetics and the OH• radicals were the main species. During irradiation, the formation of OH• free radicals was ascertained by photoluminescence studies using terephthalic acid as the probe molecule.

Hala A. Kiwaan

Papers

Photocatalytic degradation of organic dyes in the presence of nanostructured titanium dioxide

Efficient photocatalytic degradation of Acid Red 57 using synthesized ZnO nanowires

Experimental and electrical studies of Na-X zeolite for the adsorption of different dyes

Synthesis, identification and application of metal organic framework for removal of industrial cationic dyes

Synthesis, spectral characterization, DNA binding, catalytic and in vitro cytotoxicity of some metal complexes