Abstract
In the present work, we have developed a mesoporous silicalite-1 using CMC as a template for the removal of MB from aqueous solution. The synthesized silicalite-1 were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Energy-dispersive X-ray spectroscopy (EDAX) and N2 adsorption–desorption isotherm (BET). XRD and FT-IR analysis confirmed the formation of crystallinity and development of MFI structure in the mesoporous silicalite-1. The adsorption of MB dye on mesoporous silicalite-1 was conducted by batch adsorption method. The effect of various parameters such as adsorbent dosage, initial dye concentration, contact time and temperature on the dye uptake ability of silicalite-1 was investigated. The operating parameters for the maximum adsorption are silicalite-1 dosage (0.1 wt%), contact time (240 min), initial dye concentration (10 ppm) and temperature (30 ℃). The MB dye removal onto mesoporous silicalite-1 followed pseudo-second-order kinetic and Freundlich isotherm. The silicalite-1 exhibits 86% removal efficiency even after six adsorption–desorption cycle. Therefore, the developed mesoporous silicalite-1 is an effective eco-friendly adsorbent for MB dye removal from aqueous environment.
Highlights
In the last few decades, the quality of water is declining in an alarming rate
Jing et al (2016) fabricated TiO2-loaded silicalite-1 for degradation of rhodamine B. They reported that adsorbent dosage plays a key role in dye removal efficiency as they observed a significant increment in dye removal efficiency with adsorbent dosage
The effect of the environmental parameters on dye removal was studied by varying adsorbent loading (0.02–0.10 wt%), dye concentration (10–50 ppm), contact time (20–330 min) and temperature (30–60 °C)
Summary
In the last few decades, the quality of water is declining in an alarming rate. Dyes are one of the major pollutants which deteriorate our water resources such as river, lake, etc. (Wang and Ariyanto 2007; Wang et al 2008; Radoor et al 2020a) Synthetic dyes constitute about 90% of the total dye used in various industries such as paints, textiles, paper, printing, plastics and cosmetics (Gupta 2009; Sabarish and Unnikrishnan 2018a, b). Jing et al (2016) fabricated TiO2-loaded silicalite-1 for degradation of rhodamine B. They reported that adsorbent dosage plays a key role in dye removal efficiency as they observed a significant increment in dye removal efficiency with adsorbent dosage. Our team fabricated sodium alginatemodified silicalite-1 for rhodamine B removal. The result proved that sodium alginate-modified silicalite-1 exhibits good regeneration capacity (Sabarish and Unnikrishnan 2018c). In this work, we made an attempt to evaluate the dye (MB) adsorption capacity of carboxymethyl cellulose (CMC)modified silicalite-1. The effect of different parameters such as initial dye concentration, contact time, temperature, dosage on the adsorption process was discussed in details. The adsorption kinetics and isotherm on adsorption process is presented
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