Adsorption From Aqueous Solution Onto Natural and Acid Activated Bentonite

Abstract

Dyes have long been used in dyeing, paper and pulp, textiles, plastics, leather, paint, cosmetics and food industries. Nowadays, more than 100,000 commercial dyes are available with a total production of 700,000 tones manufactured all over the world annually. About 10-15% of dyes are being disposed off as a waste into the environment after dyeing process. This poses certain hazards and environmental problems. The objective of this study is to investigate the adsorption behavior of Methylene Blue (MB) from aqueous solution onto natural and acid activated Jordanian bentonite. Both bentonites are firstly characterized using XRD, FTIR and SEM techniques. Then batch adsorption experiments were conducted to investigate the effect of initial MB concentration, contact time, pH and temperature. It was found that the percentage of dye removal was improved from 75.8% for natural bentonite to reach 99.6% for acid treated bentonite. The rate of MB removal followed the pseudo second order model with a high correlation factor. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. The Langmuir isotherm model was found more representative. The results indicate that bentonite could be employed as a low cost adsorbent in wastewater treatment for the removal of colour and dyes.

Influence of Acid Activation on Natural Calcium Montmorillonite Clay

“…The type of clay is indicated by the ratio of SiO 2 / Al 2 O 3 . For our sample, SiO 2 / Al 2 O 3 ratio is 3.14 which indicate the montmorillonite nature of clay 12,13 . This is also confirmed by XRD patterns of this sample.…”

Removal of industrial pollutant (Reactive Orange 122 dye) using environment-friendly sorbent Trapa bispinosa’s peel and fruit

“…Palanisamy et al (2012) reported the wavelength of maximum absorption (k max ) for Reactive Red 195 at 543 nm by UV-Vis spectrophotometer in their study ''Polymer Composite-A Potential Biomaterial for the Removal of Reactive Dye.'' Khatib et al (2012) determined characteristic absorbance of methylene blue using a single-beam UV-Vis spectrophotometer (Model SPUV-19) at a wavelength of maximum absorbance at 660 nm in their study ''Adsorption from aqueous solution onto natural and acid activated bentonite.'' Effect of pH on the sorption of RO 122 by T. bispinosa's peel and fruit…”

Influence of the Structure and Experimental Surfaces Modifications of 2:1 Clay Minerals on the Adsorption Properties of Methylene Blue

“…The physicochemical properties of the clay minerals can be modified by several methods such as the insertion of polyoxocations and pillars [13,14] or by means of acid treatment [15][16][17][18][19], increasing the specific surface area and the pore volume of the clays minerals. Franco et al have shown that, except for Hg(II), the Fe(III)-homoionic smectites display higher metal adsorption properties than that of activated carbon used previously [20].…”