The Study of Amidoxime-Functionalized Cellulose Separate Th(IV) from Aqueous Solution

Abstract

Selective extraction of low-concentration thorium (Th(IV)) from wastewater is a very important research topic. In this paper, amidoxime cellulose was synthesized, and its composition and structure were characterized by FT-IR, SEM, XPS, and elemental analysis. The adsorption experiment results showed that the adsorption reaction was a spontaneous exothermic process. When the solid–liquid ratio was 0.12 g/L and the pH value was 3.5, the adsorption percentage of the Th(IV) in water onto amidoxime-functionalized cellulose (AO-CELL) could reach over 80%. The maximum adsorption capacity can reach to 450 mg/g. At the same time, the adsorption selectivity, desorption process and reusability of the material were also studied. The results showed that the AO-CELL had a good selectivity for Th(IV) in the system with Sr2+, Cu2+, Mg2+, Zn2+, Pb2+, Ni2+, and Co2+ as co-ions. In the nitric acid concentration of 0.06 mol/L system, the AO-CELL desorption rate of Th(IV) can reach 95%, and the adsorption rate of Th(IV) in aqueous solution of AO-CELL is still above 60% when the AO-CELL is reused four times. The above results show that the amidoxime cellulose adsorption material synthesized by our research group has good selective adsorption performance for Th(IV) of a low concentration in an aqueous solution and has a good practical application value.

Modification of Clinoptilolite as a Robust Adsorbent for Highly-Efficient Removal of Thorium (IV) from Aqueous Solutions

“…The Dubinin–Radushkevitch (D–R) isotherm model is more general than the Langmuir isotherm model since it does not postulate a constant adsorption potential or a homogeneous surface. The D–R isotherm model can be utilized to explain adsorption on both heterogeneous and homogenous surfaces [ 32 , 74 ]. The linearized form of the D–R isotherm model equation can be expressed by the following Equation (6) [ 74 ]: where qe is the adsorption capacity of adsorbent (mg/g), q max is the maximum adsorption capacity (mg/g), K is a constant related to the energy of adsorption (mol 2 /kJ 2 ), and ε is Polanyi potential (kJ/mol), which can be described as in the following Equation (7): where R is the gas law constant and is equal to 8.314 (kJ/mol·K), T is the absolute temperature (K), and Ce is the equilibrium concentration of adsorbate molecules in the solution (mg/L).…”

Preparation of Quaternary Ammonium Separation Material based on Coupling Agent Chloromethyl Trimethoxysilane (KH-150) and Its Adsorption and Separation Properties in Studies of Th(IV)

“…Tianxiang Jin modified graphene oxide to obtain materials that can capture thorium ions efficiently. Faur et al synthesized carbamoyl-methylphosphonated hydrosoluble polymers and investigated their selectivity for Gd(III)/Th(IV)/U(VI) separation [14][15][16]. These studies have made progress and breakthroughs in the separation process of thorium to a certain extent but still cannot overcome the shortcomings of the current separation materials in some aspects.…”