Adsorption of Cr(VI) onto Hybrid Membrane of Carboxymethyl Chitosan and Silicon Dioxide

Abstract

In this study, a new adsorbent material was synthesized by using carboxymethyl chitosan and silicon dioxide. The hybrid membrane was used as an adsorbent for the removal of Cr(VI) from aqueous solutions. The adsorption potential of Cr(VI) by the hybrid materials was investigated by varying experimental conditions such as pH, contact time, and the dosage of the hybrid membrane. Adsorption isotherms of Cr(VI) onto the hybrid membrane were studied with varying initial concentrations under optimum experiment conditions. The surface property of the hybrid membrane was characterized by SEM (scanning electron microscope) and Fourier transform infrared spectrometer (FTIR). The concentrations of Cr(VI) in solution are determined by ICP-AES (inductively coupled plasma atomic emission spectrometry). The present study investigates the adsorption mechanisms of Cr(VI) onto the hybrid membrane. The results provide new insight, demonstrating that the modified hybrid membrane can be an efficient adsorbent for Cr(VI) from the aqueous solution.

Removal of Chromium(VI) by Chitosan Beads Modified with Sodium Dodecyl Sulfate (SDS)

“…In the case of silicon dioxide, modified silicon dioxide produced through the graft between silanol groups and ligands has been developed [27][28][29]. We have synthesized a hybrid membrane of carboxymethyl chitosan and silicon dioxide as adsorbents for the removal of Cr(VI) in our previous work [30]. Furthermore, we have carried out an adsorption experiment of chromate ions onto cross-linked chitosan using epichlorohydrin (EP) and glutaraldehyde (GA) as cross-linked agents [31].…”

Ag2O@UiO-66 new thin film as p–n heterojunction: permanent photoreduction of hexavalent Cr

“…So far, different approaches have been applied to the reduction and toxic depletion of chromium(VI), including chemical precipitation, photocatalytic remediation, bacterial regeneration, absorbing on activated carbon, membrane process and bioremediation. [9][10][11][12][13][14][15] However, some of these methods have disadvantages such as being expensive, short usage period, needing advanced techniques and tools, as well as the probability of secondary pollution. 8,16 Photocatalytic reduction of chromium(VI) as a reliable and inexpensive method and is known as a cleaner and more practical approach than chemical reduction.…”

“…So far, different approaches have been applied to the reduction and toxic depletion of chromium( vi ), including chemical precipitation, photocatalytic remediation, bacterial regeneration, absorbing on activated carbon, membrane process and bioremediation. 9–15…”

Removal of Cr(VI) from Wastewater Using Graphene Oxide Chitosan Microspheres Modified with α–FeO(OH)

“…On the one hand, CS is a naturally degradable polymer material widely obtained from animal carapaces [ 23 ]. In addition, there are abundant amino and hydroxyl groups on the CS molecular chain that coordinate and chelate with heavy metal ions independently and assemble and modify with GO as well [ 20 , 24 , 25 ].…”