Clay/polymer nanocomposite material: a sustainable approach of leather industries wastewater treatment

Abstract

The removal of direct yellow 12 dye using clay/polymer nanocomposite in batch system and fixed-bed column experiments was investigated on the basis of numerous parameters. The results showed that the amount of dye adsorbed increased as the contact time of the process increases and the optimal pH value was 4.0. Kinetic model of pseudo-second-order and Langmuir isotherm appropriately described the experimental results obtained from the batch mode. Parameters like bed height, flow rate and initial concentration significantly influenced the direct elimination of direct yellow 12 in the process. The Yoon–Nelson, Bohart–Adams and Thomas models have been favorably fitted with revolutionary curves derived from various experimental conditions. The relevancy of clay/polymer nanocomposite has been assessed by the wastewater from tannery and the results show that clay/polymer nanocomposite is an efficient adsorbent. The values of thermodynamic parameters demonstrated that the adsorption process of direct yellow 12 dye was viable, endothermic and spontaneous. The monolayer attended its maximum and the adsorption capacity values of clay/polymer nanocomposite for direct yellow 12 dye were 70.422 mg/g, 78.362 mg/g and 103.918 mg/g at 30 °C, 40 °C and 50 °C, respectively. Clay/polymer nanocomposite seems to be a sustainable and economical material for the uptake of dyes from wastewater. Graphic abstract: [Figure not available: see fulltext.]