Preparation Of Iron - Bearing Activated Carbon And Study On Adsorption Of Dye Wastewater

Dyeing wastewater has been turned into a hot environmental issue because of characteristics of dyeing waste water such as high color, high toxicity, big water volume and so on. It needs to find an effective method to solve this problem. Activated carbon has been widely used in water treatment because it has big surface area, abundent pore structure, strongly adsorption capacity and easily regenerated. In this paper, ultrasound-microwave method has been utilized to prepare Fe-activated carbon which is used in dyeing wastewater treatment. What’s more, the effect of methylene blue adsorption capacity on Fe-activated carbon has been investigated.The experiment carries out study of preparation of Fe-activated carbon using impregnate method which is introduced some method to treat Fe-activated carbon such as microwave, ultrasound. The effect of ultrasound phase, microwave heating temperature, microwave heating time and power on activated carbon adsorption capacity have been studied. The experimental parameters have been optimazed using response surface methodology and it is explored the effeat of lanthanum and cerium on activated carbon adsorption capacity. Moreover, activated carbon has been characterized By Raman, SEM, XRD, FTIR and so on. At the same time, adsorption kinetics and adsorption isotherm experiments have been conducted. The optimal methylene blue adsorption capacity of Fe-activated carbon using ultrosound-microwave method is257mg/g under optimal conditions such as700W of microwave power,700℃of microwave heating temperature and25min microwave heating time. Comparing with raw activated carbon, it increases more than130mg/g. Moreover, the methylene blue adsorption capacity of activated carbon can be increased to be265mg/g and270mg/g using lanthanum and cerium. Experimental results indicate that Fe-activated carbon has an excellent adsorption capacity on methylene blue. The results of adsorption experiment show that it can be explained the process of activated carbon adsorption easily using Langmuir adsorption isotherm formula and pseudo-first-order kinetic formula.