Facile Synthesis of Ag/Pd Nanoparticle-Loaded Poly(ethylene imine) Composite Hydrogels with Highly Efficient Catalytic Reduction of 4-Nitrophenol

Abstract

Poly­(ethylene imine) (PEI) has abundant amino groups in a macromolecular chain and can be used as a graft source for metal nanocomposites, which shows excellent ability to form stable complexes with heavy metal ions. In this work, a simple and convenient method was used to make PEI into a stable hydrogel with 1-ethyl-3-(3-dimethylaminopropyl)­carbodiimide-N-hydroxysuccinimide and subsequently coprecipitate with silver nitrate solution or palladium chloride solution to form metal-loaded composite hydrogels. In addition, the characterizations of composite hydrogels were investigated by scanning electron microscopy, specific surface area tests (Brunauer–Emmett–Teller), X-ray photoelectron spectroscopy, and ultraviolet spectroscopy. The properties of composite hydrogels on the catalytic reduction of 4-nitrophenol were studied. The results showed that the composite hydrogels could be easily separated from the water environment, which indicated the large-scale potential application in organic catalytic degradation and wastewater treatment.

Self-assembled functional components-doped conductive polypyrrole composite hydrogels with enhanced electrochemical performances

“…TG is a test used to study the thermal stability and composition of composite hydrogels. [22][23][24][25] In order to further study the thermal stability of composite hydrogels, 26 thermogravimetric analyses was used. As shown in Fig.…”

Fabrication of CS/GA/RGO/Pd composite hydrogels for highly efficient catalytic reduction of organic pollutants

“…The comparison of the catalytic activity of CS/GA/RGO/Pd catalyst in the reduction of 4-NP and 2-NA with different reported catalysts is presented in Tables 2 and 3, respectively. 25,[59][60][61][62][63][64][65][66][67] The results show that CS/GA/RGO/Pd catalyst has good catalytic performance. Moreover, the raw materials and preparation process of CS/GA/RGO/Pd hydrogel are green, pollution-free and environmentally friendly.…”

Preparation and Photocatalytic Performances of WO3/TiO2 Composite Nanofibers

“…where X is the electronegativity of the semiconductor (X TiO2 � 5.81 eV and X WO3 � 6.59 eV [44]), E e is the energy of free electrons on the hydrogen scale (≈4.5 eV), and E g is the band gap energy of the semiconductor (E gTiO 2 � 3.23 eV and E gWO 3 � 2.6 eV). According to this empirical expression, the calculated CB (E CB ) and VB (E VB ) edge positions for WO 3 and TiO 2 are displayed in Figure 11(a). e CB potential of WO 3 (+0.79 eV) is more negative than the VB of TiO 2 (−0.31 eV) but more positive than the CB of TiO 2 (+2.93 eV); therefore, a Z-scheme charges transportation system is formed between WO 3 and TiO 2 .…”

“…e efficient degradation of toxic and hazardous substances in wastewater is the goal that researchers have always sought and has achieved very good results. For example, Jiao and coworkers have prepared a series of environmentally friendly composite hydrogel photocatalysts, which can efficiently degrade the toxic and harmful substances nitrophenol and nitroaniline that are difficult to degrade in wastewater [1][2][3].…”