Dye is an important chemical and, recently, its application in the world has boosted; however the skin irritation and cancer are of the detrimental effects of this chemical. Therefore, prior to discharge, the dye-contain effluents, in order to meet the standard values, should be treated. The present work are seeking to appraise the kinetics and isotherms of the Methylene Blue (MB) adsorption onto the surfactant (cetyltrimethylammonium bromide)-modified bentonite (CTAB-MB) in a batch study in a laboratory. The study of the MB adsorption efficiency was accomplished in batch system under different amount of effective parameters including contact time, adsorbent dosages and MB dye concentration. Optimum CTAB-MB dosage and contact time was achieved to be 2.5 g/L and 75 min, respectively. The results of isotherm studies showed the better ability of Langmuir mono-layer isotherm in explanation of the equilibrium data and the highest adsorption capacity, based on this model, was obtained to be 36.19 mg/g. According our obtained results, the CTAB-MB was obtained to be potent and efficient adsorbent to remove the MB from the studied synthetic solutions.

Objectives: Today, due to increasing usage of antibiotics and their destructive effects on health and environment, it is necessary to remove them from receiving waters. Although there are few studies on the use of magnetic nanocomposites for removal of different antibiotics, but the effect of this adsorbent on the removal of Ciprofloxacin (CIP) has not been evaluated yet. Therefore, this study was conducted to investigate the removal of CIP by magnetic Bentonite nanocomposites (Fe 3 O 4-BNP) as an adsorbent. Methods: Batch studies were performed to evaluate and optimize the effects of various parameters such as contact time, temperature of the solution, CIP concentrations and Fe 3 O 4-BNP dosage. The adsorbent characteristics were determined using SEM and FT-IR spectroscopy. Also, the adsorbent surface area was measured by BET technique. Results: the optimal values for the factors affecting CIP removal were calculated. It was revealed that the maximum CIP removal was obtained at pH = 7, temperature = 55°C, CIP concentration = 10 mg/L, Fe 3 O 4-BNP dosage = 1.25 g/L and contact time= 90 min. The maximum removal percentage was 99.25%. It was also revealed that Langmuir isotherm is the best fitted isotherm model. The thermodynamic parameters like ΔG 0 , ΔH 0 and ΔS 0 changes for the adsorption of CIP have also been computed and discussed. The heat of adsorption implied that the adsorption was exothermic in nature. Conclusion: The Fe 3 O 4-BNP was successfully applied for the uptake of CIP from industrial wastewater and separated easily by means of magnetic separation.