Abstract
In this study, modified zeolites were prepared through the modification of raw zeolites, using hydrochloric acid (HCl) and cetyl trimethyl ammonium bromide (CTAB), whose properties were then characterized by a Zeta Potential Meter and an X-ray diffractometer. Also, the adsorption mechanisms were investigated in depth. The experimental results indicated that, in terms of the adsorption capacity of Rhodamine B in water, the modified zeolites were more favorable than the raw zeolites. As the dosage of adsorbent increased, the removal percentage of Rhodamine B in the water increased, while the unit adsorption capacity decreased. The pH value of the solution, and reaction temperature imposed little effects on the adsorption of the Rhodamine B. In accordance with the adsorption thermodynamic results, Langmuir and Freundlich isothermal adsorption models were able to accurately describe the adsorption of Rhodamine B in water by the modified zeolites. The fitting results had a higher correlation when using a Freundlich isothermal model. At 303 K, the static saturated adsorption capacity was 4.41 mg/g. The kinetic results demonstrated that the adsorption of Rhodamine B in water using modified zeolites fit well with the pseudo-second-order kinetic model.
Highlights
With the development of the dyeing industry, a great deal of dye wastewater is produced in China every year (Chen, Zhao, Wu, & Dai, 2011; Hu, Chen, Ji, & Yuan, 2010)
Rhodamine B is a type of artificially synthesized organic dye, which is currently widely used in many industries, such as papermaking, printing, textile dyeing, leather, paint, and so on(Das, Ghosh, Ghosh, & Guha, 2008)
The characteristics of the diffraction peaks in the raw zeolites were still preserved in the zeolites after modification, which suggested that the crystal structures of the zeolites after the modification using hydrochloric acid (HCl) and cetyl trimethyl ammonium bromide (CTAB) remain unchanged
Summary
With the development of the dyeing industry, a great deal of dye wastewater is produced in China every year (Chen, Zhao, Wu, & Dai, 2011; Hu, Chen, Ji, & Yuan, 2010). Dye wastewater generally has a complex composition, high chemical oxygen demand (COD), high chromaticity, biochemical-degradation-resistant organic matter, and significant variations in water quality with the amount of water. These factors have made it difficult to treat the dye industry’s wastewater. Rhodamine B is a type of artificially synthesized organic dye, which is currently widely used in many industries, such as papermaking, printing, textile dyeing, leather, paint, and so on(Das, Ghosh, Ghosh, & Guha, 2008). The present study can provide assistance for further development of high-efficiency, low-cost, environmentally friendly, and novel materials which can be used for dye wastewater treatments
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