Study on the cyclic adsorption performance of biomass composite membrane for Hg(II)

ABSTRACT

Salix psammophila wood flour /polyvinyl alcohol hydrogel composite membrane (SPPM) with high adsorption capacity and good cycle adsorption performance was prepared by wet spinning technology. The SPPM was characterised by the scanning electron microscope (SEM), specific surface area test (BET), energy dispersive spectrum (EDS) thermal gravimetric analysis (TGA), fourier transform infrared spectroscopy (FT-IR), and x-ray photoelectron spectroscopy (XPS). The results showed that the surface of SPPM is rough and porous, with good pore structure and thermal stability, and mercury ions (Hg(II)) have been successfully adsorbed on SPPM. At the same time, the effects of adsorption conditions (Hg(II) initial concentration, pH, adsorption time, and temperature) on the adsorption performance of SPPM were studied. Results from the adsorption experiment showed that the adsorption capacity of SPPM for Hg(II) can reach 426 mg/g. After four adsorption and desorption experiments, the adsorption capacity can reach 375 mg/g, which indicates that SPPM has good cycle adsorption performance. The adsorption kinetics was better described by the Pseudo-second-order kinetic, and their adsorption isotherms were fitted for the Langmuir model. The obtained results showed that SPPM is an available, economical adsorbent and was found suitable for removing Hg(II) from an aqueous solution.

GRAPHICAL ABSTRACT

KEYWORDS:

• Adsorption
• composite membrane
• Hg(II)
• Salix psammophila wood powder (SPP)
• wet spinning

Acknowledgements

Conceptualisation and Methodology: X. L. Y, L. W; Writing-original draft: B. Y. Z, X.L. Y; Material preparation and analysis: B. Y. Z, X. K. L, Q. S, Y. R. L; Simulation: X. L. Y; Funding acquisition: L. W.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The data and code that support the study are available from the corresponding author upon reasonable request.

Additional information

Funding

This work was financially supported by the Inner Mongolia Autonomous Region Science and Technology Department Project (2019GG018), the Inner Mongolia Autonomous Region Natural Science Foundation Project (2021MS02024), and the Inner Mongolia Autonomous Region Science and Technology Department Project (2021GG0213).