A novel integrated multiphase crystal system of Kavlite for the effective and instantaneous removal of cationic and anionic dyes

Abstract

Textile dye effluent pollution is one of the major threats to the environment in this generation. Various techniques have emerged to remove the textile dye effluent, but adsorption is the best process for effective removal. Aluminosilicate is one of the universal adsorbents to remove textile effluents from wastewater because of its large surface area and large availability of active/acid sites. But it shows a higher affinity for the cationic dyes alone. This limits the usage for the removal of both cationic and anionic dyes. Moreover, it takes a longer time to attain equilibrium. Herein, we invented an integrated multiphase crystal system of Kavlite (NiO@AS) is nothing but multiphase nickel aluminosilicate. This is prepared by one-pot sol-gel method at room temperature and atmospheric pressure for the effective removal of Victoria Blue (VB) and Metanil Yellow (MY) within a short span of time. It is characterized by XRD, FTIR and HRTEM. Integration of nickel oxide into the aluminosilicate framework creates more active/acid sites in the framework, as evidenced by XRD analysis. Furthermore, XRD results revealed the formation of 6 different phases with 3 different crystal systems in the framework. This could also additionally induce the adsorption performance. This resulted in a faster adsorption rate of VB and MY within 10 and 35 min respectively, with 83% removal. The adsorption capacity of VB is higher than that of MY (Experimental Qe = 113.32 mg/g for VB and 20.92 mg/g for MY). This is because of the large availability of possible interaction sites in VB. This work provides a deep insight into understanding the interaction possibilities between the adsorbent and adsorbate interface based on the XRD, adsorption kinetics, isotherms and thermodynamic study.