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Browsing by Author "Makgwane, Peter R"

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Catalytic Activity and Structure Properties of Doped VOHPO4 ·0.5H2O with Nanosized Ru, Au, Fe and Mn in Benzene Hydroxylation

Author: Makgwane, Peter R ; Ray, SS Date: 2013 The promotional effect of nanosized Ru, Fe, Au, and Mn particles on VOHPO(sub4) ·0.5H(sub2)O (VHP) catalytic properties was investigated in benzene hydroxylation reaction using hydrogen hydroperoxide (H(sub2)O(sub2) as oxidant. Catalytic ... Read more
Development of a high-performance nanostructured V(sub2)O(sub5)/SnO(sub2)catalyst for efficient benzene hydroxylation

Author: Makgwane, Peter R ; Ray, SS Date: Feb 2015 Nanostructured vanadium-tin oxide (V(sub2)O(sub5)/SnO(sub2)) catalysts with V(sub2)O(sub5) loading in a range of 5–20 wt% have been synthesized. The V(sub2)O(sub5)/SnO(sub2) nanostructures exhibited effective catalytic performance in the ... Read more
Efficient room temperature oxidation of cyclohexane over highly active hetero-mixed WO3/V2O5 oxide catalyst

Author: Makgwane, Peter R ; Ray, SS Date: Sep 2014 An efficient room temperature catalyzed oxidation of cyclohexane to cyclohexanone (K) and cyclohexanol (A) was achieved over hetero-mixed tungsten–vanadia (WO(sub3)/V(sub2)O(sub5)) using H(sub2)O(sub2) oxidant. WO(sub3)/V(sub2)O(sub5) exhibited ... Read more
Fabrication of bimetal CuFe2O4 oxide redox-active nanocatalyst for oxidation of pinene to renewable aroma oxygenates

Author: Mdletshe, Lindokuhle S ; Makgwane, Peter R ; Ray, Suprakas S Date: Aug 2019 This study report on the synthesis of spinel CuFe2O4 nanostructures by surfactant-assisted method. The catalysts were characterized by X-ray diffraction (XRD), laser Raman, transition electron microscope (TEM), scanning electron microscope ... Read more
Hetero-mixed TiO2-SnO2 interfaced nano-oxide catalyst with enhanced activity for selective oxidation of furfural to maleic acid

Author: Malibo, Pretrus M ; Makgwane, Peter R ; Baker, PGL Date: Jul 2021 Herein we report on the catalytic activity of hetero-mixed TiO2-SnO2 nano-oxide catalyst for the selective liquidphase oxidation of furfural to maleic acid using H2O2 oxidant. The high surface area and strong interaction of the two oxides ... Read more
Heterostructured CeO2-M (M = Co, Cu, Mn, Fe, Ni) oxide nanocatalysts for the visible-light photooxidation of pinene to aroma oxygenates

Author: Mavuso, MA ; Makgwane, Peter R ; Ray, Suprakas S Date: Apr 2020 Herein, we report the enhanced photocatalytic activity of heterostructured CeO2 nanocatalysts interfaced with Cu, Co, Ni, Mn, and Fe metal oxides. The CeO2 catalysts exhibited an enhanced red shift in the visible-light response compared to ... Read more
Heterostructured redox-active V205/SnO2 oxide nanocatalyst for aqueous-phase oxidation of furfural to renewable maleic acid

Author: Malibo, Petrus M ; Makgwane, Peter R ; Baker, PG Date: Jun 2020 In this paper, we report on the synthesis of heterostructured V2O5/SnO2 nanocatalysts with varying vanadium metal loadings of 5–30 wt%. The catalytic performance of the designed catalysts was evaluated in the oxidation reaction of furfural ... Read more
Hydroxylation of benzene to phenol over magnetic recyclable nanostructured CuFe mixed-oxide catalyst

Author: Makgwane, Peter R ; Ray, SS Date: Mar 2015 A highly active and magnetically recyclable nanostructured copper–iron oxide (CuFe) catalyst has been synthesized for hydroxylation of benzene to phenol under mild reaction conditions. The obtained catalytic results were correlated with the ... Read more
Induced ferromagnetic and gas sensing properties in ZnO-nanostructures by altering defect concentration of oxygen and zinc vacancies

Author: Motaung, DE ; Makgwane, Peter R ; Ray, SS Date: Jan 2015 We report on the effect of the synthesis reaction-time on the structural, optical, magnetic and sensing properties of ZnO-nanostructures. Electron paramagnetic resonance and photoluminescence analyses reveal that singly ionized oxygen vacancies ... Read more
An instant photo-excited electrons relaxation on the photo-degradation properties of TiO2-x films

Author: Nkosi, SS ; Kortidis, I ; Motaung, DE ; Makgwane, Peter R ; Ndwandwe, OM ; Ray, SS ; Kiriakidis, G Date: Nov 2014 Pure and manganese (Mn) ion-doped TiO(sub2) films were grown by pulsed laser deposition under vacuum at different substrate temperatures 350 and 580 C for 50 min each. The concentration of the Mn inTiO(sub2) films was varied from 10 to 30%. ... Read more
Interface of nanocatalysis and microfluidic reactors for green chemistry methods

Author: Makgwane, Peter R ; Ray, SS Date: Oct 2013 The development of green catalytic methods for chemical synthesis and energy generation based on nanocoated catalyst microfluidic systems is a growing area of innovative research. The interface between heterogeneous catalysis and microchannel ... Read more
Metal oxide nanostructures-containing organic polymer hybrid solarcells: Optimization of processing parameters on cell performance

Author: Motaung, DE ; Makgwane, Peter R ; Ray, SS Date: Jul 2015 We report the chemical synthesis of various ZnO nanostructures and TiO2 nanoparticles and their dispersion in a P3HT matrix. The photoluminescence studies revealed improved charge transport in the active layer of the optimized TiO2 nanoparticles ... Read more
Morphology modulated photocatalytic activity of CeO2 nanostructures for selective oxidation of biobased alphaPinene to oxygenates

Author: Mavuso, MA ; Makgwane, Peter R ; Ray, Suprakash S Date: Nov 2020 The effective Ce3+/Ce4+ redox and oxygen mobility of CeO2 induced by tunable nanostructure morphology has attracted a great interest in photocatalytic organic synthesis. Herein, we report on the microwave‐assisted synthesis of CeO2 with ... Read more
Nanosized ruthenium particles decorated carbon nanofibers as active catalysts for the oxidation of p-cymene by molecular oxygen

Author: Makgwane, Peter R ; Ray, Suprakas S Date: Jul 2013 Highly dispersed, nanosized ruthenium (Ru) particles anchored on carbon nanofibers (CNFs) with varying Ru loadings (1–7 wt.%) showed effective catalytic activity in the aerobic oxidation of p-cymene using molecular oxygen. The activity of the ... Read more
Special section on Nano-Catalysis

Author: Makgwane, Peter R ; Ray, SS Date: 2013 This special issue on nano-catalysis was devoted to the development and application of nanosized structured catalysts materials in various fields such as chemical transformation, environmental cleaning and energy generation supply as a concept ... Read more
Synthesis of nanomaterials by continuous-flow microfluidics: A review

Author: Makgwane, Peter R ; Ray, Suprakas S Date: Feb 2014 The development of controlled synthesis protocols of nanostructured materials with tailored particle size and shape has been a significant research area in nanoscience and nanotechnology. Much innovative research efforts had been focused on ... Read more
Ultra-high sensitive and selective H2gas sensor manifested byinterface of n–n heterostructure of CeO2-SnO2nanoparticles

Author: Motaung, David E ; Mhlongo, Gugu H ; Makgwane, Peter R ; Dhonge, BP ; Cummings, FR ; Swart, HC ; Ray, Suprakas S Date: Jun 2018 Detection of toxic and explosive gases in a selective manner and with higher sensitivity in industries and homes remains very challenging. Therefore, herein, we report on the ultra-high sensitive and selective hydrogen gas sensing using ... Read more

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