Utilización de óxido de grafeno reducido para la adsorción del azul de metileno de los efluentes procedentes de la industria textil.

Abstract

A new and environmentally friendly adsorbent known as non-toxic citric acid-reduced graphene oxide was prepared in the research project. The effects of pH, optimal contact time, and temperature variation were investigated. With pH values of 2-11, it was observed that 4-8 maximum adsorption of dye is achieved, so when performing the adsorption, the pH value must be taken into account first. Kinetic studies showed that the adsorption data followed a pseudo-second-order dynamic model. The adsorption data obtained was described by the Langmuir and Freundlich isotherms. This analysis showed that the Langmuir model could represent the adsorption data. The maximum adsorption capacity was 187,778 mg/g. For the contaminated waters 172,985 mg/g concerning the rGO and the GO, its maximum capacity was 135,785 mg/g and 128,754 mg/g for the contaminated water. At the laboratory level, an adsorption percentage of 94,255% was obtained. One applied to effluents from the textile industry got 92,722% at a temperature of 25 ° C, because at higher temperatures the adsorption level begins to decrease and with a pH of 6.5. Finally, it is obtained that the rGO concerning the GO has a more significant increase in the adsorption capacity of methylene blue both at the laboratory level and at the industrial level. It is recommended to use the rGO to allow further studies to be carried out without the need to resort to long periods with laboratory analysis; that is, it saves us: time, costs, and errors.