3 years ago

Selective recovery of silver (I) ions from e-waste using cubically-multi-thiolated cage mesoporous monoliths

K. Halada, Dina Tolan, M. Abd El-Magied, Asem Atia, Emad Elshehy, Ahmed El-Nahas, Mohamed A. Shenashen, Sherif A. El-Safty
We report on selective engineering of hybrid organic-mesoporous silica monolith adsorbents for recovery silver (Ag) ions from e-waste samples. The Ag(I) ion multi-thiolated adsorbent scales were synthesized via three dense and continuous surface modifications of hierarchal ordered mesoporous (HOM) by actively organic moieties leading to create captured subsets onto monolithic surfaces and into orderly pore caves for suitable Ag(I) ion trapping. In addition, the HOM monolithic carriers with unique surface leads to form neat rooms for target ions. The decoration and depressing of these extra-ordinary micrometric-surface monoliths and orderly neat grooves enabled large adsorption quantity and well-dispersed coverage of multi-thiolated layers including sulfur- and nitrogen- active sites that selectively improved adsorption/trapping/capture of Ag ions. Results indicated that the adsorption of Ag ions were powerfully submissive on pH value at 6.5 and appeared to follow Langmuir adsorption model with maximum capacity 179.23 mg/g. The hierarchal multi-thiolated adsorbent scales manifested attractive selectivity for Ag ions in the presence of coexisting cations. The retention of organic building and orientation along HOM enabled the multiple-use recovery, collection and management of Ag(I) ions without alteration in its functionality and capacity. Based on our results, the hierarchal adsorbent scales may be a suitable candidate for the Ag(I) ion recovery from aquatic samples.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700644

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