In this study, a Methyl Green (MG) dye pollutant was separated by Mobil Composition Matter No. 41 (MCM-41) in a fixed-bed continuous column with investigated three parameters, namely a bed height (2-6 cm), initial MG concentration (10-30 mgL -1 ) and a process flow rate (0.8-1.6 mL min À1 ). Results indicated that the highest bed capacity of 20.97 mg/g was obtained with respective to optimal values such as; 6 cm for a column height, 0.8 mL min À1 for flow rate, and an initial MG concentration 20 mgL -1 . Furthermore, a quantity of the adsorbed pollutant decreased as the flow rate increased, while increasing the initial MG concentration yielded the opposite effect. The column apparatus was performed properly at the low flow rate, whereas both the breakthrough and exhaustion time increased with the bed depth. Thomas and Yoon-Nelson models were applied for predicting the breakthrough curves and calculating the characteristic factors of the laboratory fixed-bed adsorption column, which were beneficial for process design. Based on regression coefficient analyses, results of employing the Yoon-Nelson model was found to be superior to the Thomas one. Breakthrough performance indicated that MCM-41 was suitable for applications in continuous adsorption regimes for MG dye. The mesoporous MCM-41 was recovered effectively by calcinations and employed again for four times in the continuous system successfully.

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In this study, the behavior of a Polyvinyl chloride (18 wt % PVC) hollowfiber ultrafiltration (UF) membrane for methyl green (MG) dye removalfrom aqueous solution was estimated by studying the influence of varyingthe operation conditions (the concentration of the dye and volumetric flowrate) to determine their impact on the separation processes (permeate fluxand rejection coefficient) at constant pressure and temperature. The PVCmembrane was characterized by scanning electron microscopy.Furthermore, tests of the UF were carried out with pure water and MGaqueous solutions as feed. Outcomes explained a notable influence of feedconcentration and flow rate on the rejection and permeate flux, with thehighest rejection coefficient value close to 75.2% of the membrane system,at neutral pH.

Ultrafiltration has been favorably employed for recycling insoluble dyes and high molecular weight, some type of chemicals and water. Despite, ultrafiltration does not remove low molecular weight and soluble dyes (acid, direct, reactive, basic, etc.). The main advantages of the hollow fiber module are very high packing density and low-energy consumption. In this investigation, the performance of a Polyvinyl chloride (18 wt % PVC) hollow fiber ultrafiltration (UF) membrane for methyl green (MG) dye removal from aqueous solution was evaluated by examining the impact of varying the operation conditions (the concentration of dye and volumetric flow rate) to determine their impact on the separation processes (permeate flux and rejection coefficient) at constant pressure, temperature and at neutral pH. two configurations used: Semi-batch filtration and continuous filtration. UF was characterized by scanning electron microscopy. Besides, tests of the UF were carried out with pure water and MG aqueous solutions as feed. Results exhibited a notable influence of flow rate and feed concentration on the permeate flux and rejection, where the highest flux obtained equal to 32.7 l/hr.m2 with the highest rejection coefficient value close to 59.46% of the membrane system.