Matches in SemOpenAlex for { <https://semopenalex.org/work/W4313379818> ?p ?o ?g. }
- W4313379818 endingPage "745" @default.
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- W4313379818 abstract "Gold nanoparticles (AuNPs) have attracted extensive attention in the past few years due to their unique properties and great potential application in catalysis. However, the application of AuNPs remains a significant challenge due to the lack of high efficiency and stability caused by aggregation. Immobilization of AuNPs on appropriate support shows promising results in avoiding aggregation and improving catalytic activity. In this work, reduced graphene oxide/chitosan/gold nanoparticles (rGO/CHS/AuNPs) composites were prepared using chitosan with different molecular weights (MW) as a reducing agent and stabilizer, and characterized by FT-IR, XRD, XPS, SEM, FESEM, EDS, TEM, HRTEM, and TGA. The preparation conditions of rGO/CHS/AuNPs composites, including chitosan MW, CHS/GO mass ratio, reaction temperature and time, and HAuCl4 concentration were investigated in detail. The results indicated that reduction activity of chitosan for GO increased with the decrease of chitosan MW. The C/O ratio of rGO reduced by low molecular weight chitosan (LMWC) with viscosity-average molecular weight (Mv) of 21 kDa was 6.34. Small spherical AuNPs were uniformly immobilized on the rGO surface. The particle size of AuNPs increased from 9.29 to 13.03 nm as chitosan MW decreased from 465 to 21 kDa. The rGO/CHS/AuNPs showed good catalytic activity for the reduction of 4-NP in the presence of NaBH4. The catalytic activity of rGO/CHS/AuNPs was closely related to chitosan MW. rGO/CHS/AuNPs synthesized by LMWC with Mv of 21 kDa showed the highest kinetic rate constant of 0.2067 min−1. The results of this experimental study could be useful in the development of effective catalysts for the reduction of aromatic nitro compounds." @default.
- W4313379818 created "2023-01-06" @default.
- W4313379818 creator A5001180501 @default.
- W4313379818 creator A5011068248 @default.
- W4313379818 creator A5013281409 @default.
- W4313379818 creator A5018222802 @default.
- W4313379818 creator A5021543946 @default.
- W4313379818 creator A5029636776 @default.
- W4313379818 creator A5052244533 @default.
- W4313379818 date "2023-02-01" @default.
- W4313379818 modified "2023-10-16" @default.
- W4313379818 title "Green synthesis of reduced graphene oxide/chitosan/gold nanoparticles composites and their catalytic activity for reduction of 4-nitrophenol" @default.
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