Contributions of Various Cd(II) Adsorption Mechanisms by Phragmites australis-Activated Carbon Modified with Mannitol
Open Access
- 16 March 2022
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Omega
- Vol. 7 (12), 10502-10515
- https://doi.org/10.1021/acsomega.2c00014
Abstract
Due to its high toxicity, persistence, and bioaccumulation in the food chain, controlling cadmium (Cd) pollution in wastewater is urgent. Activated carbon is a popular material for removing Cd. To improve the Cd(II) adsorption efficiency by increasing the number of oxygen-containing functional groups, Phragmites australis-activated carbon (PAAC) was modified with mannitol at a low temperature (150 °C). The textural and chemical characteristics of PAAC and modified PAAC (M-PAAC) were analyzed by surface area analysis, elemental analysis, Boehm’s titration, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Batch adsorption experiments were conducted to investigate the influence of Cd(II) concentration, contact time, ionic strength, and pH on Cd(II) adsorption. The main adsorption mechanisms of Cd(II) on activated carbon were quantitatively calculated. The results showed that mannitol modification slightly decreased the SBET (5.30% of PAAC) and increased the content of carboxyl, lactone, and phenolic groups (total increase of 43.96% with PAAC), which enhanced the adsorption capacity of PAAC by 58.59%. The adsorption isotherms of PAAC and M-PAAC were described well using the Temkin model, while the intraparticle diffusion model fitted the Cd(II) adsorption kinetics best. Precipitation with minerals was a crucial factor for Cd(II) adsorption on activated carbon (50.40% for PAAC and 40.41% for M-PAAC). Meanwhile, the Cd(II) adsorption by M-PAAC was also dominated by complexation with oxygen-containing functional groups (33.60%). This research provides a method for recovering wetland plant biomass to prepare activated carbon and efficiently treat Cd-containing wastewater.Funding Information
- Natural Science Foundation of Ningbo (202003N4131)
- Ningbo University (XYL20022)
- National Natural Science Foundation of China (42007367)
- Department of Education of Zhejiang Province (Y202043946)
This publication has 60 references indexed in Scilit:
- Activated carbons with well-developed microporosity and high surface acidity prepared from lotus stalks by organophosphorus compounds activationsCarbon, 2013
- Influence of pH, ionic strength and humic acid on competitive adsorption of Pb(II), Cd(II) and Cr(III) onto titanate nanotubesChemical Engineering Journal, 2012
- Hydrogen peroxide modification enhances the ability of biochar (hydrochar) produced from hydrothermal carbonization of peanut hull to remove aqueous heavy metals: Batch and column testsChemical Engineering Journal, 2012
- Removal of Cu, Zn, and Cd from aqueous solutions by the dairy manure-derived biocharEnvironmental Science and Pollution Research, 2012
- Relative distribution of Pb2+ sorption mechanisms by sludge-derived biocharWater Research, 2012
- Removal of Pb(II) from aqueous solution using modified and unmodified kaolinite clayJournal of Hazardous Materials, 2009
- Removal of phenol from aqueous solutions by adsorption onto activated carbon prepared from biomass materialJournal of Hazardous Materials, 2008
- Removal behavior of sericite for Cu(II) and Pb(II) from aqueous solutions: Batch and column studiesSeparation and Purification Technology, 2007
- Surface oxides on carbon and their analysis: a critical assessmentCarbon, 2002
- Classification of Gibbs adsorption isothermsAdvances in Colloid and Interface Science, 1998