Abstract
Current study was carried out to determine the adsorption ability of the Multiwall carbon nanotubes (MWCNTs) by adsorption Malachite Green dye from an aqueous solution. Crystal structure of the materials was measured using powder X-rays diffraction (PXRD), UV–Vis diffuse reflectance and specific surface area (BET). Many parameters that affecting the adsorption process such as contact time, pH, adsorbent dosage, initial dye concentration and temperature were studied. The outcome showed that an increasing occurred in the adsorbent dosage and the rate of dye removal, and the best efficiency for Malachite Green dye removal was amounted 99. 11 %. The results were obtained at optimal reaction conditions were pH = 5.5, catalyst weight 0.15 g, T = 298 K and reaction time = 1 h. In addition, the equilibrium adsorption isotherms and kinetics studies were investigated using Freundlich and Langmuir isotherms. The Freundlich isotherm (R2=0.9506) was found to be the best fitted for experimental data of this study .A higher correlation value of kinetic model was observed close to pseudo-second-order (R2=0.999) compared to other kinetic models.
Highlights
Water constitutes 70 to 90 percent of the earth’s surface
The effect of MWCNTs mass on the efficiency of Malachite Green dye removal was investigated via performing a series of experiments using different doses of MWCNTs with the initial dye concentration of 50 ppm
It can be noticed from these results that the sum of malachite green color adsorbed MWCNTs at pH 5, 15 mg of MWCNTs and 298.15 K increased with an improvement in adsorption time for all doses of MWCNTs used
Summary
Water constitutes 70 to 90 percent of the earth’s surface. Life ceases to exist without it. Azo dyes are the most powerful types of dyes used in water treatment [2].These dyes are widely used in the clothing, food and color printing industries. It is possible to efficiently extract dyes from contaminated aqueous solutions by adsorption processes. The aim of current research is extracting Malachite Green dye out of simulated industrial textile wastewaters via adsorption over multi-walled carbon nanotubes. Various factors, such as contact time effects, dosage of MWCNTs, pH, and temperature, that could influence the capacity of MWCNTs for adsorption will be investigated. Experimental data will be undertaken to suit with kinetic and equilibrium model
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