Adsorption Studies on Ag(I) Using Poly(N-phenylglycine) Membrane and Application in Practical Silver Recycling
Source abstract
Abstract
Adsorption methods offer advantages in the treatment of polluted water, particularly with the removal of heavy metal ions, because they are simple in process and no secondary pollutants are involved. Conductive polymers are good adsorbents because of their diverse functional groups and large, active surface areas. Poly(N-phenylglycine) (PNPG) is an emerging conductive polymer used in adsorption studies. In this study, a PNPG membrane was prepared by vacuum filtration, and characterization studies were performed to elucidate the reaction mechanism between the PNPG membrane and Ag(I). It was found that most benzenoid diamine structures undergo a redox reaction with Ag(I), while a minority undergo chelation. Through studies on the pH influence, adsorption kinetics, and adsorption isotherms, this adsorption process fits the pseudo-second-order and Langmuir models which indicate chemical adsorption and monolayer adsorption. The maximum Ag(I) adsorption capacity of the PNPG membrane, 366 mg g–1, was also close to the theoretically calculated value at pH 6. In addition, the PNPG membrane showed potential for the recovery of Ag from real solutions when leaching solutions of e-waste and municipal solid waste incineration fly ash were subjected to adsorption experiments.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Recycling and Waste Management Techniques · Adsorption and biosorption for pollutant removal · Extraction and Separation Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Faculty of Systems Science and Technology, Akita Prefectural University, 84-4 Aza Ebinokuchi, Tsuchiya, Yurihonjo, Akita 015-0055, Japan
Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
Funding
Japan Society for the Promotion of Science
References (48)
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