Highly efficient and convenient nanocomposite catalysts produced using in-situ approach for decomposition of 4-nitrophenol

Plant Extracts Activated by Cold Atmospheric Pressure Plasmas as Suitable Tools for Synthesis of Gold Nanostructures with Catalytic Uses

“…In this case, the above-mentioned bands were shifted to 3245, 3246 and 3245 cm −1 after the AuNPs synthesis ( Table 3 ). This suggested that the prepared aqueous plant extracts participated in the formation of AuNPs as well as their further capping and stabilization [ 17 ].…”

“…Recently, it has been proven that utilization of AuNPs increases the efficiency of chemical transformations, which includes degradation of for example, toxic organic pollutants (such as 4-nitroaniline and 4-nitrophenol (4-NP)) [ 9 , 10 , 11 ], dyes (such as Congo red, acridine orange, bromothymol blue, phenol red, methylene blue and rhodamine B) [ 10 , 12 , 13 ], biomolecules (such as estradiol (E2)) [ 14 ] and monosaccharides (such as arabinose) [ 15 ]. Although the literature indicates that utilization of AuNPs immobilized on different supports should be preferred from a practical point of view [ 15 , 16 , 17 , 18 , 19 ], the homogenous catalysts containing AuNPs often exceed the catalytic efficiency of heterogeneous ones [ 9 , 10 , 11 , 12 , 13 , 14 ]. It is usually attributed to their ability to be active on a “molecular level” [ 20 ].…”

A Mini-Review on Anion Exchange and Chelating Polymers for Applications in Hydrometallurgy, Environmental Protection, and Biomedicine

“…The solution for synthesizing Au, Pt, and PdNPs of defined granulometric properties was found, knowing the role of H 2 O in the reduction process. As displayed in Figure 6, the adsorption step was carried out in 1 mol L −1 HCl that suppressed the reduction [46,49]. Then, the resins saturated with Au(III), Pt(VI), and Pd(II) were transferred to H 2 O, where the reduction began.…”

“…Based on the results, it was stated that the smallest in-size NPs can be derived by using anion exchange resins bearing compounds revealing bis-amino functionality (such as 1,2-diaminoethane), Within the carried-out research, a link between an applied amino functionality, acting as a molecular reactor, and the size and shape, as well as concentration, of Au, Pt, and PdNPs was found. Based on the results, it was stated that the smallest in-size NPs can be derived by using anion exchange resins bearing compounds revealing bis-amino functionality (such as 1,2-diaminoethane), while the greatest concentration thereof, was observed by applying amines of a heterocyclic nature [49].…”

“…The nanocomposites containing AuNPs [49] or both Au and PdNPs [46] were used as heterogeneous nanocatalysts for the catalytic decomposition of 4-nitrophenol (4-NF) to 4-aminophenol (4-AF). As compared to the other studies [50][51][52][53][54][55][56], the designed catalysts led to the complete decomposition of 4-NF, and what is more, their physical form (suspension copolymers of grain diameter 0.6 mm) allowed their convenient and multiple reuse, without any additional treatment [46,49]. Because within the research project, a second type of nanocatalysts for decomposition of 4-NP was designed, the NCs for applications in catalysis are summarized and compared to the literature further in the text (please refer to Table 4).…”