Removal of hexavalent chromium from wastewater using supported liquid membrane: synthesis of chromium‐iron complex through electrochemical reaction

Abstract

Treatment of wastewater containing hexavalent chromium is the issue in this research. Supported liquid membrane with in situ electrochemical reaction in stripping section helps to reduce hexavalent chromium to trivalent chromium by forming chromium-iron complex. Iron plate acts as anode in stripping section. The chromium-iron complex is an useful value added product that can be used for various purposes such as catalyst in water-gas shift reaction. Aliquat 336 has been used as carrier for transport of hexavalent chromium. Various physicochemical parameters have been optimised to detect the condition of maximum transport and precipitation of chromium-iron complex in stripping phase. The important physico-chemical parameters such as strip phase concentration, strip phase pH and concentration of carrier (% v/v) in Liquid Membrane have been selected through response surface methodology to obtain optimum performance for %precipitation of chromium.

Hybrid Technique for Removal of Arsenic from Drinking Water

“…Related research works have also been carried out where more than one heavy metal was removed through precipitation [27], electrochemical reactions [28], and electrodeposition [19,29]. Based on the literature review, it has been found that the transport efficiency of As(III) is low in comparison to As(V) by the flat-sheet (FS)-SLM technique.…”

Efficient soluble anionic dye removal and antimicrobial properties of ZnO embedded‐ Polyphenylsulfone membrane

“…Water scarcity has been intensified by the fast growth in the industrialization of rural areas, leading to them being exposed to hazardous industrial effluents. In industry, the discharge of huge amounts of coloured wastewater containing synthetic dyes has become a global concern, as a large number of dyes are toxic and nondegradable in nature and cause serious damage to human health and aquatic ecosystems because of their complicated and stable chemical structures (Hua et al ., 2012; Ahmad et al ., 2015; Chen et al ., 2015; Lin et al ., 2015; Bouazizi et al ., 2017; Esfahani et al ., 2019; Mao et al ., 2020; Mondal and Saha, 2020). In this context, to decrease the risk of environmental pollution, dyes need to be removed from wastewater before it is discharged into the environment.…”