An Imidazole Thione-Modified Polyhedral Oligomeric Silsesquioxane for Selective Detection and Adsorptive Recovery of Au(III) from Aqueous Solutions

Abstract

Developing a material toward simultaneous detection and recovery of gold ions (Au­(III)) is highly desirable for the economy and the environment. Herein, we report a highly efficient dual-function material for simultaneous Au­(III) detection and recovery by simply introducing abundant imidazole thione and thioether groups in one system. This material, that is, an imidazole thione-modified polyhedral oligomeric silsesquioxane (POSS-2), was prepared by a mild reaction of an imidazolium-containing POSS and sulfur at ambient temperature. The POSS-2 suspension in water can rapidly and selectively detect Au­(III) with a very low limit of detection of 1.2 ppb by fluorescence quenching or a visualized color change from white to dark orange. POSS-2 can also selectively and efficiently capture Au­(III) with a maximum adsorption uptake of 1486.5 mg/g. The adsorption process well fits with the pseudo-second-order kinetic and Langmuir models. The intriguing dual-function performance is better than most of the previous Au­(III) probes or adsorbents. The mechanism study reveals that the detection and adsorption behavior are mainly caused by the redox reaction and coordination between imidazole thione and thioether groups and Au­(III). Furthermore, POSS-2 was successfully utilized to extract gold without interference from a discard CPU. These results indicate the potential application of the present dual-function material for Au­(III) detection and recovery from aqueous solutions. More dual-functional materials could be designed and prepared by this simple strategy.

Utilizing Reclaimed Petroleum Waste to Synthesize Water-Soluble Polysulfides for Selective Heavy Metal Binding and Detection

“…The removal of Na + could not be quantified due to interference from the polymer solution. Gold­(III) adsorbents have been reported with maximum binding capacities from ∼40 to 3260 mg/g adsorbent with most systems obtaining less than 900 mg/adsorbent. ,,, However, unlike the polysulfides formed here, many of the successful adsorbents require multistep or complex syntheses and require the use of organic solvents.…”

A sulfur-containing fluorescent hybrid porous polymer for selective detection and adsorption of Hg2+ ions

“…The removal efficiency is as high as >90% when the Hg 2+ ion concentration is between 20 ppm and 300 ppm, which may be due to the driving force of the concentration gradient. 61 It is worth noting that when the Hg 2+ ion concentration is lower than 50 ppm, the removal efficiency can reach up to >99.99%. For example, the original Hg 2+ concentration at 50 ppm and 20 ppm can be reduced to 1.544 ppb and 0.306 ppb (far below the permissible level (2 ppb) for drinkable water) with the removal efficiencies of 99.997% and 99.999% within 3 h. As the concentration of Hg 2+ ions increases from 2000 ppm to 5000 ppm, the adsorption amount increases slowly and tends to reach a stable value because of near saturation of adsorption sites, while the removal efficiency drops sharply.…”

“…The removal efficiency is as high as >90% when the Hg 2+ ion concentration is between 20 ppm and 300 ppm, which may be due to the driving force of the concentration gradient. 61 It is worth…”

Organic–Inorganic Hybrid Near-Infrared Emitting Porous Polymer for Detection and Photodegradation of Antibiotics

“…Therefore, the aggregation-caused quenching (ACQ) effect is avoided and the fluorescence intensity is enhanced. 37 Cage silsesquioxanes (SQs, typically, cubic R 8 Si 8 O 12 ) are ideal structural units for constructing porous materials because of their rigidity, high functionalization, and specific robustness to heat and water; the presence of inorganic−organic hybrid SQ units provides both (inorganic) high thermal stability and (organic) further functionalization. 38 Octavinylsilsesquioxane (OVS) is the most versatile monomer among various SQ derivatives because it is easily available at a low cost.…”