Methylene blue adsorption in hydrocarbons textile waste

ABSTRACT

Textile products, increasingly present in our daily lives, generate a large amount of waste, whether solid or liquid. Giving the right destination or even transforming solid waste is the new challenge to be faced. Solid waste, usually tissue scraps, contains a large amount of organic compounds that can be carbonized. In this context, the main objective of the present study was the synthesis of hydrochars using textile waste. The hydrochars formed may be used as dye adsorbents such as methylene blue. Hydrochars synthesis used a residue/water ratio of 3/80 mass (g)/volume (mL) at a temperature of 220 °C. The time was investigated between 6 to 12 hours, and in the latter there was 71.2% carbon, obtained by EDS, and followed for characterization by ATR-FTIR, XDR, SEM and pH_zpc. The proposed material presented significant adsorption capacity in alkaline environment, around 72 mg.g^-1. The kinetic data obtained were better adjusted in the pseudo second-order model suggesting that the adsorption process was controlled by chemissorption, with electron sharing or exchange between adsorbent and adsorbate. Langmuir model presented better correlation with equilibrium data. Hydrochars synthesized with textile waste therefore have great potential in applications, aiming at the removal of organic pollutants from liquid solutions.

Keywords
hydrothermal carbonization; textile waste; methylene blue adsorption