Enhanced catalytic reduction of para-nitrophenol using α-MoO₃ molybdenum oxide nanorods and stacked nanoplates as catalysts prepared from different precursors

Abstract

2018) Enhanced catalytic reduction of paranitrophenol using α-MoO 3 molybdenum oxide nanorods and stacked nanoplates as catalysts prepared from different precursors, Journal of Taibah University for Science, 12:2, 133-137, ABSTRACT Molybdenum oxide, α-MoO 3 , nanorods and stacked nanoplates were prepared from oxalate, citrate and tartrate precursors. These molybdenum oxides showed high efficiencies in the reduction of para-nitrophenol to para-aminophenol in the presence of NaBH 4 . The prepared precursors were first characterized by thermal gravimetric analysis (TGA) and then thermally decomposed at 350°C (oxalate precursor) and 550°C (citrate and tartrate precursors). The final oxides were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and the Braunauer-Emmet-Teller (BET) technique. The oxalate precursor is the most efficient catalyst for the reduction reaction. ARTICLE HISTORY

Molybdenum Trioxide: Efficient Nanosorbent for Removal of Methylene Blue Dye from Aqueous Solutions

“…The comparative links between α-MoO 3 and other sorbents presented in this work are shown in Table 6 . The Molybdenum trioxide (α-MoO 3 ) nanorods and stacked nanoplates synthesized easily and efficiently at rather low temperature with the use of simple and economical approach [ 61 , 66 ] showed high removal capacity. In addition, the molybdenum trioxide is presenting the advantage to be successfully regenerated as it will be presented in this paper.…”

“…Molybdenum trioxide nanosorbent (α-MoO 3 ) was synthesized using the thermal decomposition of an oxalic precursor of Molybdenum gained from the reaction of oxalic acid and ammonium molybdate (NH 4 ) 6 Mo 7 O 24 ·4H 2 O in the solid state, as described in our earlier work [ 61 ]. Oxalic acid and ammonium molybdate (NH 4 ) 6 Mo 7 O 24 ·4H 2 O were mixed together in a ratio of Mo:acid of 1:3.…”

“…The powder characterization in terms of the phase composition of the synthetized α-MoO 3 nanosorbent, was analyzed by XRD (X-ray diffractometer 6000, Shimadzu, Tokyo, Japan, installed with λ Cu-Kα = 1.5406 Ǻ and Ni filter). The specific surface area was deduced from the nitrogen isotherm adsorption and using the BET equation (D BET = 6000/d.S, where S is the specific surface area and d is the density), as reported in our previous work [ 61 ]. The specific surface area value was 41.02 m 2 /g.…”

“…Due to the outstanding electrochemical and catalytic activities, α-MoO 3 has been widely considered [ 48 , 53 , 54 ]. Thus far, a number of α-MoO 3 nanostructures were synthesized including nanobelts, nanoparticles, nanosheets, flower-like hierarchical structures and nanoflakes [ 49 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 ]. However, few studies are reported on the use of Molybdenum trioxide for removing dyes.…”

“…In our previous work, Molybdenum trioxide (α-MoO 3 ) nanorods and stacked nanoplates were synthesized easily and efficiently at a rather low temperature with the use of a simple and economical approach [ 61 , 66 ]. In this study, the capacity of the materials of interest were tested to remove methylene blue dye (MB) from aqueous solutions.…”