Abstract
In this study, the adsorption of methylene blue dye was examined by using pyrolusite ore as a low-cost alternative adsorbent source. Pyrolusite, which contains mainly MnO2, is a manganese ore. The effects of the initial concentration of dye, contact time, initial pH of solution, adsorbent dosage, stirring speed of solution, and average particle size of adsorbent on the adsorption of methylene blue were studied. It was found that the percentage of the adsorbed dye increased with increasing the amount of pyrolusite. While the initial dye concentration, initial pH, contact time, stirring speed, particle size, and adsorbent dosage were 25 ppm, 6, 90 min, 250 rpm, 63 µm, and 12 g/l, respectively, the efficiency of dye adsorption on pyrolusite ore was 99%. The isotherm and kinetic studies relating to this adsorption process were also made. It was found that the equilibrium data followed the Langmuir isotherm model while the kinetic of process could be described by the pseudo-second order kinetic model.
Highlights
The waste solutions containing organic and/or inorganic contaminants after various industrial processing come into existence
The aim of this study is to investigate the use of pyrolusite as an alternative adsorbent material for the removal of methylene blue dye from aqueous solutions
Determination of optimal adsorbent dosage: To determine the optimum adsorbent dosage for different concentrations of methylene blue, the experiments were performed at five different pyrolusite dosages in the range of 0.2-0.6 g while the initial concentrations of the solution containing methylene blue dye were changed from 10 to 150 ppm
Summary
The waste solutions containing organic and/or inorganic contaminants after various industrial processing come into existence These effluents are frequently discharged directly to environment. Discharged wastewaters can induce serious damages on the environment and human health due to their hazardous ingredients From both environmental and economical perspectives, organic and inorganic pollutions in industrial wastewater must be removed or reduced to the permissible levels before they are discharged to the environment by using appropriate separation methods [1,2,3]. The effluents containing dyes are mostly released directly to water source without applying any purification procedure These kinds of wastewaters can cause to the pollution of water and soil in the surrounding of the plant due to their toxic, nondegradable, and carcinogenic characters. The methods applied for removal of dyes from wastewater adsorption [3, 12,13,14,15], membrane filtration [16, 17], and microbial degradation [18, 19] have been applied for treating the effluents containing dyes
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