title: Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores.
abstract: Developing low-cost, efficient processes for recovering and recycling palladium, gold and cobalt metals from urban mine remains a significant challenge in industrialized countries. Here, the development of optical mesosensors/adsorbents (MSAs) for efficient recognition and selective recovery of Pd(II), Au(III), and Co(II) from urban mine was achieved. A simple, general method for preparing MSAs based on using high-order mesoporous monolithic scaffolds was described. Hierarchical cubic Ia3d wagon-wheel-shaped MSAs were fabricated by anchoring chelating agents (colorants) into three-dimensional pores and micrometric particle surfaces of the mesoporous monolithic scaffolds. Findings show, for the first time, evidence of controlled optical recognition of Pd(II), Au(III), and Co(II) ions and a highly selective system for recovery of Pd(II) ions (up to ~95%) in ores and industrial wastes. Furthermore, the controlled assessment processes described herein involve evaluation of intrinsic properties (e.g., visual signal change, long-term stability, adsorption efficiency, extraordinary sensitivity, selectivity, and reusability); thus, expensive, sophisticated instruments are not required. Results show evidence that MSAs will attract worldwide attention as a promising technological means of recovering and recycling palladium, gold and cobalt metals.
authors.affiliation: National Institute for Materials Science, Japan; Graduate School for Advanced Science and Engineering, Waseda University; sherif.elsafty@nims.go.jp; sherif@aoni.waseda.jp.
authors.forename: Sherif A
authors.initials: SA
authors.lastname: El-Safty
authors.affiliation: National Institute for Materials Science, Japan.
authors.forename: Mohamed A
authors.initials: MA
authors.lastname: Shenashen
authors.affiliation: Center for Research in Isotopes and Environmental Dynamics, Tsukuba University.
authors.forename: Masaru
authors.initials: M
authors.lastname: Sakai
authors.affiliation: National Institute for Materials Science, Japan.
authors.forename: Emad
authors.initials: E
authors.lastname: Elshehy
authors.affiliation: National Institute for Materials Science, Japan.
authors.forename: Kohmei
authors.initials: K
authors.lastname: Halada
mesh_terms: D000327:Adsorption; D003035:Cobalt / Q000737:chemistry* / Q000302:isolation & purification; D006046:Gold / Q000737:chemistry* / Q000302:isolation & purification; D008906:Mining / Q000379:methods*; D036103:Nanotechnology / Q000379:methods*; D010165:Palladium / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D003035:Cobalt; D010165:Palladium; D006046:Gold