What is it about?

We report the selective engineering of hybrid organic mesoporous silica monolith adsorbents for the recovery of silver (Ag) ions from e-waste samples. The AgI multi-thiolated adsorbent scales were synthesized through dense and continuous surface modifications of hierarchically ordered mesoporous (HOM) monolith by active organic moieties. Captured subsets were created onto monolithic surfaces and into orderly pore caves for suitable AgI trapping. In addition, HOM monolithic carriers with unique surface dominants, micrometric-sized particles, high surface-area-to-pore volume ratios, and uniform groove space-like cage-cavity form neat rooms for target ions. Decoration and depression of the extraordinary micrometric-surface monoliths and orderly neat grooves enable large adsorption quantity and well-dispersed coverage of multi-thiolated layers. These layers include sulfur- and nitrogen-active sites that selectively improved AgI adsorption/trapping/capture among competitive matrices. Results indicated that the adsorption of AgI was powerfully submissive at pH 6.5 and appeared to follow the Langmuir adsorption model with a maximum capacity of 179.23 mg g-1. The hierarchical multi-thiolated adsorbent scales exhibited selectivity for Ag ions in the presence of coexisting cations. The retention of organic building and orientation along HOM enabled multiple-use recovery, collection, and management of AgI without altering its functionality and capacity. The results suggest that the hierarchical adsorbent scales are suitable for AgI recovery from aquatic samples

Featured Image

Why is it important?

Diverse mesoporous surface functionality can be designed to selectively recover and recycle target elements. The present study has demonstrated that three dense and continuous surface modifications of hierarchical ordered mesoporous HOM by active organic moieties are promising for building multi-thiolated adsorbent scales of AgI. The unique depressing of extra-ordinary micrometric-surface caves along the entirely monolithic particles and the orderly neat grooves (pore cages) enabled large adsorption quantity and well-dispersed coverage of building multi-thiolated including amino/mercapto active site groups that selectively improved the adsorption/trapping/capture of Ag ions among binary and multi-component ions. The hierarchical multi-thiolated adsorbent scales showed an excellent ability in removing and recovering AgI from aqueous solution at a maximum adsorption capacity of 179 mg g-1 at 25 °C. Moreover, the stability of inorganic-organic adsorbent scales, as well as the hierarchical structures, neat grooves, and adsorption functionalities create a suitable adsorbent for repeated use of AgI recovery from e-waste.

Perspectives

Diverse mesoporous surface functionality can be designed to selectively recover and recycle target elements. The present study has demonstrated that three dense and continuous surface modifications of hierarchical ordered mesoporous HOM by active organic moieties are promising for building multi-thiolated adsorbent scales of AgI. The unique depressing of extra-ordinary micrometric-surface caves along the entirely monolithic particles and the orderly neat grooves (pore cages) enabled large adsorption quantity and well-dispersed coverage of building multi-thiolated including amino/mercapto active site groups that selectively improved the adsorption/trapping/capture of Ag ions among binary and multi-component ions. The hierarchical multi-thiolated adsorbent scales showed an excellent ability in removing and recovering AgI from aqueous solution at a maximum adsorption capacity of 179 mg g-1 at 25 °C. Moreover, the stability of inorganic-organic adsorbent scales, as well as the hierarchical structures, neat grooves, and adsorption functionalities create a suitable adsorbent for repeated use of AgI recovery from e-waste.

Dr Mahmoud Osman Abd El-Magied
Nuclear Materials Authority

Read the Original

This page is a summary of: Selective Recovery of Silver(I) Ions from E-Waste using Cubically Multithiolated Cage Mesoporous Monoliths, European Journal of Inorganic Chemistry, November 2017, Wiley,
DOI: 10.1002/ejic.201700644.
You can read the full text:

Read

Contributors

The following have contributed to this page