Preparation and characterization of novel organic chelating resin and its application in recovery of Zn(II) from aqueous solutions

Abstract

An organic polymeric resin was synthesized by anchoring p-aminobenzoic acid onto macroporous chloromethylated polystyrene beads, and was used for Zn(II) removal from aqueous solutions. The resin exhibited an initially rapid adsorption property for Zn(II) with equilibrium time of 10 h and the maximum adsorption capability approached 184.5 mg g À1 . Optimum pH was 4.5. The mechanism of adsorption was investigated using kinetic, isotherm and thermodynamic models. The adsorption kinetic data were described well by a pseudo second-order model with R 2 of 0.997. There was a negative ΔG (À17.98 kJ mol À1 ) and positive ΔH (13.58 kJ mol À1 ). HCl solution (1.0 mol l À1 ) could achieve an elution rate of 100%. The experimental data were well fitted by the Thomas model with R 2 of 0.9826.

Study on the Adsorption Properties of D113 Cation Exchange Resin for Zn2+

“…It shows that the adsorption efficiency remained basically between 74 and 76 % with the increase of ZnSO4 concentration, whereas qe increased gradually. It was noteworthy that when the concentration was greater than 1.0 mol/L, the corresponding qe was unchanged, and 405 mg/g was the maximum adsorption capacity, which was bigger than 184.5 mg/g of some novel organic chelating resin [19]. The total exchange capacity of D113 resin was more than 10.8 mmol/g (dry) in Table 1.…”

Orderly Porous Covalent Organic Frameworks-based Materials: Superior Adsorbents for Pollutants Removal from Aqueous Solutions

“…Over the past few decades, enormous research about natural and man-made adsorbents, such as clays, 121 , 122 ACs, 123 organic resins, 124 , 125 CNTs, 126 , 127 , 128 order mesoporous carbon (OMC), 129 carbonaceous materials, 130 , 131 , 132 graphene oxide (GO), 133 , 134 , 135 , 136 , 137 , 138 , 139 metal oxides, 140 , 141 layered double hydroxides (LDHs), 142 , 143 , 144 , 145 and layered metal sulfides (LMS), 146 have been applied in pollution cleanup. However, these materials suffered from some insufficiencies: (1) LDHs and clays exhibit slow sorption kinetics and limited selectivity; (2) ACs and carbonaceous materials possess disadvantages of small pore volumes or pore sizes; (3) GO and CNTs are complicated to synthesize and produce; (4) the poor regeneration and reusability of organic resins; and (5) relatively low chemical and thermal stability of LMS.…”