WebRapid industrialization leads to increased wastewater discharge encompassing hexavalent chromium (Cr(VI)), which leads to serious environmental problems of toxicity and potential carcinogenicity. Removal of these species is normally carried out by ion-exchange, precipitation, membrane filtration, sorption, photocatalytic reduction, etc. WebThe conventional chemical reduction-precipitation technique in the removal of Cr(VI) from contaminated groundwater involves a two-step process whereby Cr(VI) is first reduced to Cr(III) at an acidic pH by a reducing agent and in a subsequent step, Cr(III) is precipitated as insoluble hydroxide at an alkaline pH.
Electrochemical Reduction of Hexavalent Chromium on Two- step ...
http://www.fzxb.org.cn/CN/10.13475/j.fzxb.20240904111 WebDec 30, 2024 · The review presents advances in the removal of Cr(III) from the industrial effluents published in the last ten years. Although Cr(III) has low solubility and is less dangerous for the aquatic environment than Cr(VI), it cannot be released into the aquatic environment without limitations and its content in water should be restricted. can i buy i bonds with ira money
Removal of Cr (VI) by electrochemical reduction - ScienceDirect
Webpollutants to less noxious chemical species by either oxidation or reduction, such as reduction of Cr(VI) to Cr(III) and dehalogenation of hydrocarbons. This book focuses on the methods of preparation of iron nanomaterials that can carry out contaminant removal processes and the use of these nanoparticles for cleaning waters and soils. It WebJan 4, 2024 · Reduction of Cr(VI) in a bioelectrochemical system (a): microorganisms consume organic matter and generate electrons at anode, then the electrons are transported to cathode, Cr(VI) receives electrons and is reduced to Cr(III) finally, and a photocatalytic microbial fuel cell (a + b): part of Cr(VI) is reduced by bio-generated electrons, the other … WebDec 1, 2005 · It was found that after treatment times ranging from 320 to 25 minutes this could reach values as low as 0.5 mg L− 1, depending on the operating conditions, and it became clear that the variable affected the solubility of the species generated in solution. This work aimed at studying the electrochemical reduction of the hexavalent chromium … can i buy ibuprofen with hsa