Preparation of hydrogels based on poplar cellulose and their removal efficiency of Cd(II) from aqueous solutions.
Fengrong ZhangCuilan ZhangJia TengDandan HanLishun WuWanguo HouPublished in: Journal of water and health (2023)
Industrial heavy metal-contaminated wastewater is one of the main water pollution problems. Adsorbents are a promising method for the removal of heavy metal contaminants. Herein, polyaspartic acid/carboxymethyl poplar sawdust hydrogels (PASP/CMPP) and ascorbic acid/carboxymethyl poplar sawdust hydrogels (VC/CMPP) were prepared by aqueous polymerization using alkalized poplar sawdust (CMPP) as the substrate and PASP and vitamin C (VC) as modifiers. The effective results, provided by the characterization analysis of SEM and BET, indicate that the surface of the PASP/CMPP hydrogel has a larger number of loose pores and a larger pore volume than the VC/CMPP hydrogel. The treatment effects of the two hydrogels on simulated wastewater containing Cd(II) were investigated by a batch of experiments. The results showed that PASP/CMPP had a better adsorption effect than VC/CMPP under the same adsorption conditions. Interestingly, the solid concentration effect was found in the process of sorption kinetics and sorption isotherms. The sorption kinetic curves of Cd(II) on PASP/CMPP were well-fitted by the quasi-second-order kinetics under different adsorbent concentrations. The adsorption conforms to Langmuir and Freundlich adsorption isotherm models. More importantly, PASP/CMPP composites are expected to be used as a new kind of environmental adsorbent for wastewater treatment.
Keyphrases
- heavy metals
- aqueous solution
- sewage sludge
- wastewater treatment
- hyaluronic acid
- drug delivery
- tissue engineering
- risk assessment
- wound healing
- health risk assessment
- drug release
- health risk
- anaerobic digestion
- antibiotic resistance genes
- extracellular matrix
- mental health
- nk cells
- human health
- ionic liquid
- climate change
- particulate matter
- mass spectrometry
- microbial community
- reduced graphene oxide
- gold nanoparticles
- amino acid