چكيده به لاتين
Environmental pollution has been regarded as serious concern of today world which is occurring due to human ignorance toward environmental matters. Modernization, population growth, and industrialization development might be importance elements of pollutants, that could contaminate water resources. Considering the water shortages along with water pollution, it is highly essential to implement stringent rules over pollution control.
There are numerus techniques for the removal of pollutants from aquatic media that among them, adsorption by biomaterials are called as one the most common low – cost method of water and wastewater treatment. Zeolite, as a low – cost natural material, is extensively available in Iran that has been utilized in different applications, including pollutant adsorption. In the current study, natural zeolite clinoptilolite was modified with polypyrrole and magnetic nanoparticles for the removal of ibuprofen from aquatic media. The influence of important parameters, including adsorbent dosage, pollutant concentration, pH, etc was examined. The optimization of the process was conducted by two methods: (I) the first methods was one- factor – at – a time and (II) the second method was done by means of RSM model. In the first step, initial concertation of ibuprofen, adsorbent dosage contact time, agitation speed, temperature and pH was optimized and under optimum conditions the removal efficacy of 98% was achieved. Agitation speed imposed a direct influence of the performance of the system, since it enhanced the collision and interaction between the adsorbent and ibuprofen molecules, resulting in better removal efficiency, 15orpm was found as the best value for agitation speed. Increment in temperature resulted in greater adsorption which is indicative of an endothermic process. The optimum temperature and pH were 45 °C and 5, respectively. In the second step of experiments by design expert, the optimum values of pH, temperature, and agitation speed were set the values found from the former step, however, the other parameters were optimized by SRM. The optimum point was at contact time 18 min, adsorbent dosage 130 mg, and pollutant concertation 11 µg/mL with the maximum removal efficiency of 86%. Such difference is ascribing to the interaction between all parameters simultaneously.
