Enhancement of Remazol Brilliant Blue R Adsorption Capacity by using Modified Clinoptilolite

Authors

1 Faculty of Chemical Engineering, UniversitiTeknologi MARA Pulau Pinang, 13500 PermatangPauh, Penang, Malaysia

2 School of Civil Engineering, UniversitiSains Malaysia, 14300 NibongTebal, Penang, Malaysia

Abstract

In this study, the adsorption behavior of Remazol Brilliant Blue R (RBBR) from aqueous solution by using raw and modified clinoptilolites were investigated. In the experimental work, raw clinoptilolite (R-CL) was treated with Zn(NO3)2  in ethanol and produced zinc-grafted clinoptilolite (Zn-CL).The adsorption experiments were carried out under different conditions of initial concentration (25-250 
mg/L),  adsorption  time (0-2h),  solution  pH  (2-12),  and  temperature  (300-353  K)  to  determine optimum conditions for the highest RBBR  removal.  The influence of  these parameters on  the adsorption capacity was studied using the batch process. The results indicated that the solution pH was observed to be a key factor of the RBBR adsorption process. The maximum dye adsorption was achieved with Zn-CL adsorbent at pH~6 and the corresponding adsorption capacity was found to be 42.2 mg/g, which was higher than R-CL (12.5 mg/g). Lower adsorption capacity of RBBR was found by Zn-CL between pH 8 and 12 opposite to R-CL which showed a marginal increase in adsorption capacity within the same pH range. The results proved that Zn-CL which is a modified clinoptilolite is an effective adsorbent for the removal of RBBR from aqueous solution.

Keywords


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