Separation of Cd(II) from its aqueous solution using environmentally benign vegetable oil as liquid membrane

Abstract

This work is intended for extraction and recovery of toxic heavy metal components, viz. Cadmium (Cd), from the industrial wastewater using liquid membrane (LM)-based separation technique. Exploring environmental benignity in the solvent (LM) is the main aim of this work. Vegetable oils are potential candidates toward that. Presence of carrier component in solvent often augments the solute transport mechanism. Although N,N-dimethyloctylamine (DMOA) is a very good carrier to show excellent extraction, the recovery is poor possibly because of high stability of complex between Cd(II) and DMOA in the membrane phase. The performance of LM-based separation process is affected by various physical and chemical parameters viz. pH, concentration, stirring rate, temperature, carrier concentration. An optimum operating condition has been identified that would yield the most efficient transport of solute.

Separation of toxic heavy metals from its aqueous solution using environmentally benign vegetable oil as liquid membrane

“…From our previous studies of BLM 1 and SLM 2 configurations, we reported that Na 2 -EDTA is an efficient stripping agent for the stripping of M from the membrane phase due to its metal chelating capacity. From our previous studies of BLM 1 and SLM 2 configurations, we reported that Na 2 -EDTA is an efficient stripping agent for the stripping of M from the membrane phase due to its metal chelating capacity.…”

“…1 Industries such as pulp and paper, battery, fertilizer, chlor-alkali, alloy and steel, paints and pigments, petrochemicals and mining activities include the major source of these toxics. cadmium and lead which cause serious damage to the environment and the human health in particular.…”

“…cadmium and lead which cause serious damage to the environment and the human health in particular. [1][2][3][4] The allowable limits of lead and cadmium in drinking water, as guided by World Health Organization (WHO), are 3 ppb and 10 ppb respectively. 2,3 These heavy metals tend to bio-accumulate and bio-magnify in the food chain causing severe health problems.…”

Supported liquid membrane based removal of lead(II) and cadmium(II) from mixed feed: Conversion to solid waste by precipitation

“…The contamination of aqueous environment by hazardous heavy metals such as lead(II) and cadmium(II), through industrial effluents, is a major problem and an universal concern to the research community owing to their carcinogenic, highly toxic and non-biodegradable nature [1,2]. Attention has been paid to reduce the concentrations of lead (II) and cadmium (II) in the effluents to their permissible limits (0.10 ppm for lead(II) and 0.03 ppm for cadmium(II)) set by the World Health Organization (WHO) [3].…”

“…The main benefits of selecting coconut oil are its low cost, easy availability and bio degradability. Moreover, it has high viscosity, high boiling point and high chemical stability in membrane pores [1,2,[16][17][18][19]. Various parameters such as concentration of feed phase, pH, concentration of carrier in membrane phase, concentration of stripping agent have also been studied.…”