Adsorption of uranium by low-cost adsorbent derived from agricultural wastes in multi-component system

Abstract

A B S T R A C TThe impact of common cations and anions on the adsorption of uranium on rice straw activated carbon has been examined. The presence of these ions in solution was found to inhibit the uptake of cadmium by chitin to different degrees. Presence of Fe ions depressed the uranium removal to 77 and 20% at 20 and 100 mg/l, respectively. Coexistence of some anions induced small positive effect on uranium adsorption percent like Cl -; 91.0%, CO 2À 3 ; 89.3%, HCO À 3 ; 88.8%, S 2 O 2À 3 ; 93.8%, and OH -; 91.6% compared to 84.2% uranium removal. Simultaneous presence of both uranium and thorium reduced uranium sorption from 100 to 35.9 mg/g. Data were good fitted by the Langmuir isotherm with correlation coefficient higher than 0.998. This means, the adsorption is monolayer chemical in nature on homogenous surface.

Adsorption of uranium in the presence of different ions, humic acid and effect of thorium on uranium adsorption by activated carbon

“…This is good for our carbon as it was reported that the carbon mesopores enhanced its adsorption capacity for metals [18]. The full details of single-component adsorption of uranium and thorium on activated carbons RSK and RSN were described in our previous work [11]. In this concern, RSK was determined to be superior in removal of uranium while RSN for thorium than nonoxidized carbon.…”

“…RSK has low value of acidic groups, such as carboxyl, hydroxyl, and carbonyl [11] to which alkali ions can attach so that alkali metal ion didnot adsorb and didnot affect the uranium adsorption. The minor effect of light metals on the adsorption of uranium onto RSK indicates the selectivity of the uptake of uranium onto this carbon.…”

“…These functional groups provide binding sites. The main physicochemical characteristics of oxidized and nonoxidized carbons were reported in detail in our earlier work [11]. The surface area of RSN and RSK was measured using N 2 -BET method and found to be 87.2 and 143.3 m 2 /g, respectively.…”

“…(2014) [1][2][3][4][5][6][7][8][9][10][11][12] www.deswater.com doi: 10.1080/19443994.2014.937757 chemistry, industry, medicine, and daily life [2]. Interest in the adsorption of metal ions for recovery purposes has increased manifold in recent years, because of its simplicity, selectivity, and efficiency [3].…”

Study on adsorption characteristics of uranyl ions from aqueous solutions using zirconium hydroxide

“…Like many other heavy metals such as chromium, lead, mercury and nickel, uranium and its compounds are highly poisonous substances. Uranium can enter the human body through respiration or through contact with an open wounds and its radioactivity also poses increased risks of lung cancer and bone cancer [1][2][3][4]. Thus, removal of uranyl ions from wastewater should be concerned because of the significance of potential environmental hazards.…”