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Synthesis of Au/Al 2 O 3 Nanocatalyst and its Application in the Reduction of p ‐Nitrophenol
Author(s) -
Yazid Hanani,
Adnan Rohana,
Farrukh Muhammad Akhyar,
Hamid Shafida Abdul
Publication year - 2011
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201190093
Subject(s) - chemistry , catalysis , scanning electron microscope , nuclear chemistry , transmission electron microscopy , colloidal gold , cationic polymerization , isoelectric point , nanoparticle , analytical chemistry (journal) , 4 nitrophenol , inorganic chemistry , absorption spectroscopy , atomic absorption spectroscopy , chemical engineering , chromatography , organic chemistry , physics , quantum mechanics , engineering , enzyme
Abstract Gold (Au) nanoparticles supported on alumina (Al 2 O 3 ) were prepared at several pH levels via the deposition‐precipitation (DP) method. The effects of pH at below and above the isoelectric point (IEP) of Al 2 O 3 as well as the pH adjustment before and after the addition of the support into the gold chloride solution were investigated. The results revealed the formation of cationic, clusters and metallic Au on alumina. The catalytic activity of these species was tested in the reduction of p ‐nitrophenol ( p ‐NP) using hydrazine as a reductant. The catalytic reaction was monitored spectrophotometerically and the highest rate constant ( k ‐) achieved based on pseudo first order kinetic model was 12.7 × 10 ‐3 s ‐1 . Structural and elemental characterizations of the supported gold nanoparticles were carried out using X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy‐dispersive X‐rays (EDX), atomic absorption spectrometry (AAS), and ultraviolet‐visible spectroscopy (UV‐Vis).