Adsorptive recovery of precious metals from aqueous solution using nanomaterials – A critical review

ZIF-8 metal organic framework materials as a superb platform for the removal and photocatalytic degradation of organic pollutants: a review

“…63–67 Compared with the traditional and commercially available adsorbent materials, including coconut shells, layered double hydroxides (LDH), and activated carbon, ZIF-8-based materials possess high porosity and a large specific surface area, endowing this type of material the ability to adsorb several molecules with various sizes. 68–70 The specific surface area determined for pure ZIF-8 nanoparticles varies between 1500 and 2500 m 2 g −1 , which is superior to that of other adsorbents. 59,71 Alternatively, in comparison with pristine ZIF-8, ZIF-8 hybrids have shown satisfactory results for the adsorption of organic pollutants owing to their high adsorption capacity and better stability and recyclability.…”

Recyclable poly-m-phenylenediamine selectively recovers gold from acidic solutions

“…Compared to macroscopic adsorbent materials, nanosorbents have advantages due to their small size, fast adsorption rate and high capacity. 3 For example, Ma's team used the Fenton reagent as an oxidant to form pyrrole–thiophene copolymer (cPPyTh) on Fe 3 O 4 /SiO 2 composites using a chemical oxidation polymerization reaction in an aqueous medium. 4 The Fe 3 O 4 /SiO 2 /cPPyTh nanocomposites prepared by this experimental team have excellent adsorption properties on Au( iii ).…”

Rapid and Selective Gold Stripping from Electronic Waste with Yolk–Shell-Structured Ion-Imprinted Magnetic Mesoporous Nanorobots for Efficient Water Decontamination

“…The toxic additives or hazardous substances in electronic components such as heavy metals and halogenated organic pollutants can damage the human brain and/or the coordination system, causing environmental and human health risks. , Therefore, the effective disposal of e-waste has become an urgent issue for the human society. Noteworthily, most of the electronic devices are enriched in high-value metals, especially precious metals. , It has been reported that the gold abundance of e-waste is significantly richer than that in currently available natural ores and minerals . Specifically, e-waste approximately contains 10–10,000 g of gold/ton, whereas gold ore contains barely 0.5–13.5 g of gold/ton .…”

“…9,10 It has been reported that the gold abundance of ewaste is significantly richer than that in currently available natural ores and minerals. 11 Specifically, e-waste approximately contains 10−10,000 g of gold/ton, whereas gold ore contains barely 0.5−13.5 g of gold/ton. 12 The recovery of gold from ewaste is becoming an attractive e-waste disposal strategy, which is not only beneficial to the environment and the global circular economy but also a prudent measure to address the critical metal supply chain bottleneck.…”