Sulfhydryl MCM-41(SH-MCM-41) mesoporous materials were prepared via a hydrothermal method,and-SH was successfully imported by a post-grafting method.The structure and surface properties of the materials were character...Sulfhydryl MCM-41(SH-MCM-41) mesoporous materials were prepared via a hydrothermal method,and-SH was successfully imported by a post-grafting method.The structure and surface properties of the materials were characterized using Fourier Transform infrared spectroscopy,X-ray diffraction and Transmission Electron Microscopy analysis.The low concentrations of La^3+,Gd^3+ and Yb^3+ adsorption on the material were investigated.This paper discusses the effects of system factors,such as pH and the solid-liquid ratio,on the performance of the adsorption process.The adsorption thermodynamics and kinetics were also explored.Experimental results indicated that the materials were in good order and had high specific surface area(956 m^2/g) with an average pore diameter of 2.1 nm;the mercapto groups were successfully grafted onto a molecular sieve,and the best grafted amount was 1.46×10^-3 mol/g.The materials showed preferable adsorption of La^3+,Gd^3+ and Yb^3+ with maximum adsorption capacities of560.56 mg/g,467.60 mg/g and 540.68 mg/g,respectively.The adsorption process can be described by the Freundlich isotherm model,and the adsorption data fits pseudo-second-order kinetics.After repeating the elution-regeneration cycle four times,the adsorption capacity of rare earth ions was mostly maintained,indicating that the adsorbent can be regenerated well and recycled to save costs.It has potential in practical application.展开更多
In this article,ion-imprinting technology was used to prepare the lanthanum ion-imprinted polymer,LaIIP-MAA/Fe_(3)O_(4)-GO with magnetic graphene oxide as a carrier and methacrylic acid as a functional monomer.A serie...In this article,ion-imprinting technology was used to prepare the lanthanum ion-imprinted polymer,LaIIP-MAA/Fe_(3)O_(4)-GO with magnetic graphene oxide as a carrier and methacrylic acid as a functional monomer.A series of characterizations were performed on the imprinted materials,the adsorptive and selective properties of the imprinted materials for lanthanum ions were explored,and the adsorption process was analyzed with respect to kinetics and thermodynamics.Finally,the reusability of the imprinted materials was studied.The results show that La-IIP-MAA/Fe_(3)O_(4)-GO has good adsorption effects for lanthanum ions,and adsorption equilibrium can be attained in about 20 min.When pH is 6 and the temperature is 35℃,the adsorption capacity reaches 110.98 mg/g.The adsorption process of lanthanum ions is pretty much in line with the quasi-second-order kinetic model and Freundlich isotherm adsorption model.La-IIP-MAA/Fe_(3)O_(4)-GO has good selectivity to lanthanum ions and maintains good effects after repeated use five times.展开更多
文摘Sulfhydryl MCM-41(SH-MCM-41) mesoporous materials were prepared via a hydrothermal method,and-SH was successfully imported by a post-grafting method.The structure and surface properties of the materials were characterized using Fourier Transform infrared spectroscopy,X-ray diffraction and Transmission Electron Microscopy analysis.The low concentrations of La^3+,Gd^3+ and Yb^3+ adsorption on the material were investigated.This paper discusses the effects of system factors,such as pH and the solid-liquid ratio,on the performance of the adsorption process.The adsorption thermodynamics and kinetics were also explored.Experimental results indicated that the materials were in good order and had high specific surface area(956 m^2/g) with an average pore diameter of 2.1 nm;the mercapto groups were successfully grafted onto a molecular sieve,and the best grafted amount was 1.46×10^-3 mol/g.The materials showed preferable adsorption of La^3+,Gd^3+ and Yb^3+ with maximum adsorption capacities of560.56 mg/g,467.60 mg/g and 540.68 mg/g,respectively.The adsorption process can be described by the Freundlich isotherm model,and the adsorption data fits pseudo-second-order kinetics.After repeating the elution-regeneration cycle four times,the adsorption capacity of rare earth ions was mostly maintained,indicating that the adsorbent can be regenerated well and recycled to save costs.It has potential in practical application.
基金Project supported by the National Natural Science Foundation of China(51664042)。
文摘In this article,ion-imprinting technology was used to prepare the lanthanum ion-imprinted polymer,LaIIP-MAA/Fe_(3)O_(4)-GO with magnetic graphene oxide as a carrier and methacrylic acid as a functional monomer.A series of characterizations were performed on the imprinted materials,the adsorptive and selective properties of the imprinted materials for lanthanum ions were explored,and the adsorption process was analyzed with respect to kinetics and thermodynamics.Finally,the reusability of the imprinted materials was studied.The results show that La-IIP-MAA/Fe_(3)O_(4)-GO has good adsorption effects for lanthanum ions,and adsorption equilibrium can be attained in about 20 min.When pH is 6 and the temperature is 35℃,the adsorption capacity reaches 110.98 mg/g.The adsorption process of lanthanum ions is pretty much in line with the quasi-second-order kinetic model and Freundlich isotherm adsorption model.La-IIP-MAA/Fe_(3)O_(4)-GO has good selectivity to lanthanum ions and maintains good effects after repeated use five times.
