AI Article Synopsis
- The study synthesized N-methylene phosphonic acid chitosan (NPCS-PEI) from chitosan and other chemicals, which showed a high surface area and effective removal of copper (Cu) and lead (Pb) from water.
- Factors like pH, concentration, and temperature were tested, revealing that Cu and Pb adsorption follows a pseudo-second-order kinetic model and fits the Langmuir isotherm model, indicating efficient uptake.
- The NPCS-PEI maintained over 85% efficiency after repeated use and was particularly selective for copper, with chemical analyses showing that functional groups facilitated metal ion binding.
Article Abstract
In this paper, N-methylene phosphonic acid chitosan (NPCS-PEI) was synthesized from chitosan, phosphorous acid, formaldehyde and hyperbranched polyethyleneimine (PEI), and Cu and Pb removal performance was examined in aqueous solution. NPCS-PEI exhibited three-dimensional porous architectures, with a specific surface area of 490.61 m/g. The effects of pH, initial concentration, adsorption time, temperature and ionic strength on the adsorption capacity were investigated. The adsorption kinetics indicated that Cu and Pb adsorption onto NPCS-PEI follows a pseudo-second-order model. The adsorption isotherms agree well with the Langmuir isotherm model, and the maximum adsorption capacities of Cu and Pb on the NPCS-PEI are approximately 276.12 and 645.16 mg/g, respectively. The adsorption efficiency of NPCS-PEI remained above 85% after 5 adsorption-desorption successive cycles. Moreover, the NPCS-PEI aerogels had selective adsorption toward Cu. The FTIR and XPS analysis proved that amino, hydroxyl, and phosphonic acid groups were involved in the chelation with metal ions.
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| http://dx.doi.org/10.1016/j.carbpol.2021.118355 | DOI Listing |
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