Removal of hexavalent chromium from aqueous solution by crosslinked mangosteen peel biosorbent

Abstract

In present study the potential of a new biosorbent obtained from mangosteen peel was investigated for the removal of hexavalent chromium and trivalent chromium from the aqueous solutions. The biosorbent was modified by using concentrated sulphuric acid as the crosslinking reagent. Various batch experiments were carried out testing different values of several parameters such as pH, contact time, adsorbent dosages, and metal ion concentration to identify the optimum conditions. The effect of these parameters on the adsorption capacity and selectivity was studied. Results showed that optimum pH for hexavalent chromium adsorption was 3.0 and adsorption equilibrium was attained in 120 min. The adsorption data were found to fit Langmuir model and pseudo-secondorder equation. The adsorption mechanism for hexavalent chromium was found to be a complex process involving esterification, reduction and ion exchange, while cation exchange is the main route for trivalent chromium adsorption. From the above results, the crosslinked mangosteen peel gel appears to be a potential low-cost and effective adsorbent for hexavalent chromium and trivalent chromium removal from the waste water.

Chemical treatment of teff straw by sodium hydroxide, phosphoric acid and zinc chloride: adsorptive removal of chromium

“…Teff has very high amount of calcium content and is an excellent source of vitamin C. In the literature, a number of agricultural residues have been tested as adsorbent for chromium removal (Ali and Gupta 2006;Ali 2010Ali , 2012Ebrahimi et al 2015;Kunquan et al 2015;Shiow-Tien et al 2014;Venkatesan et al 2014;Doan et al 2008;Martinez et al 2015;Huang et al 2015;Santos et al 2016;Ali 2012;Elwakeel 2010). However, only few studies have been reported on use of teff straw as an adsorbent because of its less familiarity in scientific research world (Mulu 2013;Bezuayehu et al 2014).…”

Adsorptive remediation of hexavalent chromium from synthetic wastewater by a natural and ZnCl2 activated Sterculia guttata shell

“…In comparison with physical activation, chemical activation process is efficient at the lower temperature and the global yield likely to be greater since burn-off char is not essential [9]. The chemical activation method has been widely used for the preparation of activated carbons from different plant biomasses through various chemical reagents such as Ricinus communis leaves by zinc chloride [10], sunflower head, stem by sulfuric acid [11], bael fruit shell by ortho-phosphoric acid [12], palm shell by persulfate, formaldehyde [13], mangosteen peel by sulfuric acid [14], sugar cane husk, sawdust by ortho-phosphoric acid [15], coir pith by zinc chloride, hexadecyltrimethylammonium bromide [16,17], and Ficus carica fiber by phosphoric acid [18].…”

Untitled

“…While in biosorbents coming from agricultural waste, at high temperatures, it has been demonstrated that it increases the absorption capacity of metallic ions, which could be due to the activity on the surface of the biosorbent in the same way that the kinetic energy of metallic ions is increasing with higher temperature (Park et al, 2010;Morosanu et al, 2017). In other studies, it has been found that the adsorption capacity diminishes with the increase of temperature, in these cases it is said to be an exothermic process (Huang et al, 2015).…”

“…(Han et al, 2006;Pehlivan et al, 2008). In most cases they are left in contact until equilibrium is reached between the biosorbent et al, 2015; Djemmoe et al, 2016;Huang et al, 2015), velocidad de agitación (Daneshvar et al, 2017;Bulut & Tez, 2007), cantidad del adsorbente (Argun et al, 2007), temperatura (Moubarik & Grimi, 2015), concentración inicial (Das et al, 2014), fuerza iónica y coexistencia de otros contaminantes (Park et al, 2010;Larous et al, 2005).…”

“…Mientras que, en biosorbentes que provienen de residuos agrícolas, a altas temperaturas, se ha demostrado que aumenta la capacidad de adsorción de iones metálicos, lo cual se puede deber a que la actividad en la superficie del biosorbente así como la energía cinética de los iones metálicos está aumentando con el incremento de temperatura (Park et al, 2010;Morosanu et al, 2017). En otros estudios se ha encontrado que la capacidad de adsorción disminuye con el aumento de temperatura, en estos casos se dice que es un proceso exótermico (Huang et al, 2015).…”