Abstract
A lab-scale study on the application of supported liquid membranes (SLM) has been conducted for recovery and selective removal of Malachite Green dye from wastewater. Naturally occurring non-toxic vegetable oils have been used as membrane liquids. Polyvinylidene fluoride (PVDF) films have been used as supports for the liquid membrane. Various parameters affecting the dye permeation such as initial dye concentration, pH, stripping acid concentration, oil viscosity and membrane stability have been investigated. The highest flux value (1.65 × 10−5 mg/cm2/sec) was obtained with a sunflower oil supported membrane at pH 11 in the feed and 0.25 M HCl in the stripping solution. The membrane showed good stability under optimum conditions and maximum transport was achieved in 8 h of permeation time.
Highlights
Textile and printing industries discharge huge amounts of effluent which, along with other contaminants, are mostly colored
The different vegetable oils that were selected to be used as membrane liquids for the transportation transportation of Malachite Green (MG) are presented in Table 2 along with the values for viscosity and flux
Olive oil showed lower flux owing to its higher viscosity, which is due to the presence viscosity, which is due to the presence of mixed triglyceride esters of oleic acid, palmitic acid and of mixed triglyceride esters of oleic acid, palmitic acid and other fatty acids
Summary
Textile and printing industries discharge huge amounts of effluent which, along with other contaminants, are mostly colored. Elimination of color from wastewaters is a challenging problem. The color comes from the diversity of dyes used in textile and many other industries. Dyes are chemical compounds which are designed to adsorb/absorb or deposit within a surface to impart color. These molecules have the ability to attach themselves onto the surface of cloth to impart color. According to a recent review [1], about 100,000 synthetic dyes exist, with annual production reaching more than 7 × 105 tons per year and they contribute significantly towards water pollution
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