Abstract
In this study, the effect of NaOH on the synthesis of mesoporous silica (MS) by using municipal solid-waste incinerator (MSWI) ash slag was investigated. Moreover, the prepared MS was used as a support to evaluate its potential for the recovery of gold ions (Au(III)) from aqueous solution. The extraction process for the MSWI ash slag activated through mechanical grinding entailed alkali treatment, using varying concentrations of NaOH. The content of Si extracted from MSWI ash slag increased with the increasing grinding time and NaOH concentration. As the NaOH concentration increased, the pore structure (e.g., Brunauer–Emmett–Teller (BET) surface area and pore volume) of the synthesized MS improved. In addition, the amount of adsorbed Au(III) increased with increasing sulfur content immobilized on the support, and the sulfur content was in turn governed by the silanol content of the MS support. The adsorbent prepared by using the MS-3M support exhibited the highest Au(III) adsorption capacity (110.3 mg/g), and its adsorption–desorption efficiency was not significantly affected even after five adsorption–desorption cycles.
Highlights
Mesoporous silica (MS) is a typical porous material with regularly arranged pores, several to tens of nanometers in size
We investigated the effect of NaOH concentration on the pore-related properties of the synthesized mesoporous silica (MS), the BET surface area, pore size distribution and pore volume
Of the adsorption, regardless of the number of cycles, compared to the adsorption capacity. These results demonstrate that the adsorbent synthesized from the MS-3M support enables effective and stable recovery of Au(III) from aqueous media
Summary
Mesoporous silica (MS) is a typical porous material with regularly arranged pores, several to tens of nanometers in size. Among the stabilization and recycling methods developed far, the melting method is the most stable and economical, because, the operating cost is somewhat high, the volume of the final product is reduced by approximately 30–50%, which makes it the most effective method [20] This method increases the temperature of the incineration ash to 1300–1400 ◦ C to completely decompose harmful substances, and the heavy-metal component is significantly stabilized through the formation of a solid solution in the internal structure of the slag [18,20]. The possibility of using MSWI ash slag as a functional material for accessing mesoporous materials was evaluated
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
