Synthesis and characterisation of titanium dioxide nanoparticles prepared within hyperbranched polyethylenimine polymer template using a modified sol–gel method

Mathumba, Penny; Kuvarega, Alex T.; Dlamini, Langelihle Nsikayezwe; Malinga, Soraya P.

doi:10.1016/j.matlet.2017.02.108

Cited by 29 publications

(16 citation statements)

References 29 publications

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“…Hyperbranched polyethyleneimine belongs to a class of materials identified as dendrimers as it a branched macromolecule which consists of a diaminoethane core, interior branching polyethyleneimine intermediates and an abundance of surrounding NH 2 functional groups which make the molecule hydrophilic 20,21 . The interior branching units render multiple internal nanocavities which can be utilized as a host for the production of small and robust nanoparticles because HPEI has a quasi-spherical structure that provides a shell which inhibits the aggregation of nanoparticles 21 .…”

Section: Introductionmentioning

confidence: 99%

A composite of platelet-like orientated BiVO4 fused with MIL-125(Ti): Synthesis and characterization

Hlophe

Mahlalela

Dlamini

2019

Sci Rep

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The development of heterojunctions is the current focus of the scientific community as these materials are visible light active and the staggered positioning of their band edges combats electron-hole recombination which is the downside of most photocatalysts. In this work, a two- step hydrothermal synthesis protocol was utilized to fabricate a novel observable-light active material, composed of platelet-like BiVO 4 and a titanium-based metal organic framework (MOF) called MIL-125(Ti). The tuning of specific morphologies, such as platelet-like in BiVO 4 , provides the exposure of most reactive facets which are more reactive towards photooxidation of organics in water, thus increasing their efficiency. The as-synthesized heterojunction was characterized by Transmission electron microscopy (TEM), scanning transmission microscopy (SEM), X-Ray diffraction (XRD), Raman spectroscopy, ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS), X-Ray photoelectron spectroscopy (XPS) and photoluminescence (PL) spectra. The formation of the heterojunction lead to a positive shift of the 3-2 Bi:Ti valence band (VB) (1.78 eV) when compared to 1.27 eV VB position of BiVO 4 . The PL and photoelectrochemical measurements revealed that the heterojunction photocatalyst designated 3-2 Bi-Ti demonstrated inhibited recombination rate (platelet-like BiVO 4 > 3-2 Bi:Ti (PM) > MIL-125 > 1–1 Bi:Ti > 2–3 Bi:Ti > 3-2 Bi:Ti) and highly efficient interfacial charge shuttle between platelet-like BiVO 4 and MIL-125(Ti) through the formed n - n junction.

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Section: Introductionmentioning

confidence: 99%

A composite of platelet-like orientated BiVO4 fused with MIL-125(Ti): Synthesis and characterization

Hlophe

Mahlalela

Dlamini

2019

Sci Rep

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“…TiO 2 nanoparticles were prepared according to a previously reported method by Mathumba et al (2017). To prepare the HPEI/TiO 2 composite, HPEI (9.83 mmol) was first dissolved in deionised water (5 mL).…”

Section: Fabrication Of Pes/hpei/tio2 Photocatalytic Membranementioning

confidence: 99%

“…HPEI has cavities that act as hosts for nanoparticle synthesis through electrostatic attractions between the nitrogen groups, thus producing uniform and well-dispersed nanoparticles (Koloti et al, 2018;Mathumba et al, 2017). In our previous study HPEI played a significant role in the production of small and well-dispersed TiO 2 nanoparticles (Mathumba et al, 2017). Moreover, these nanocavities accommodate the catalyst and act as adsorption sites for degradation and removal of organic pollutants.…”

Section: Introductionmentioning

confidence: 98%

Photocatalytic degradation of a basic dye in water by nanostructured HPEI/TiO2 containing membranes

Mathumba

Maziya

Kuvarega

et al. 2020

WSA

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A photocatalytically active membrane was synthesized through the embedding of HPEI/TiO2 nanocomposite in PES membrane for the removal of methyl orange (MO) dye from water. Membranes were characterized using scanning electron microscopy coupled with energy dispersive X-ray, atomic force microscopy, water contact angle measurements and water flux analysis. PES/HPEI/TiO2 membranes showed improved hydrophilicity and were effective in the photodegradation of MO. The reaction rate for MO degradation was 11.6 x 10−3∙min−1, and the degradation was accompanied by the generation of sulphate ions as degradation by-products.

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“…This is mainly due to the water runoffs from agricultural soils where phosphate fertilizers were used. Cd 2+ is a common impurity in phosphate fertilisers [ 9 , 11 , 14 , 15 ]. Chemical precipitation, ion exchange, reverse osmosis, phytoremediation and adsorption are methods applied in heavy metal removal in water [ 3 , 4 , 5 , 6 , 7 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanodots Embedded on a Polyethersulfone Membrane for Cadmium(II) Removal from Water

2021

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Cadmium(II) is a toxic heavy metal in aquatic systems. As a potential solution, green carbon nanodots (CNDs) were synthesized from oats and embedded on polyethersulfone membrane (PES) via phase inversion for the adsorption of Cd2+ from water. Characterization techniques for the CNDs and PES membranes were transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Raman spectroscopy, atomic force microscopy (AFM), contact angle and a pure water flux assessment system operated at 300 kPa. TEM results showed that the CNDs were well dispersed with a uniform shape and size (6.7 ± 2.8 nm). Raman spectroscopy revealed that the CNDs were embedded on the PES and the ID/IG ratio slightly increased, showing that the membranes maintained good structural integrity.The CNDs/PES proved to be more hydrophilic than PES. The glassy carbon electrode (GCE) in anodic stripping voltammetry (ASV) technique detected 99.78% Cd2+ removal by 0.5% CNDs/PES at optimum conditions: 30 min. contact time, at pH 5 and 0.5 ppm Cd2+ solution. The 0.5% CNDs/PES removed Cd(II) due to the hydroxyl group (-OH) and carboxyl group (-COO-) on the membrane composite. It was established that Cu2+ and Pb2+ have a significant interfering effect during the analysis of Cd2+ using GCE in ASV technique. The 0.5% CNDs/PES is recyclable because it removed above 95% of cd2+ in four cycles. In a spiked tap water sample, 58.38% of Cd2+ was sensed by GCE of which 95% was in agreement with the value obtained from inductively coupled plasma optical emission spectrometry (ICPOES).

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Synthesis and characterisation of titanium dioxide nanoparticles prepared within hyperbranched polyethylenimine polymer template using a modified sol–gel method

Cited by 29 publications

References 29 publications

A composite of platelet-like orientated BiVO4 fused with MIL-125(Ti): Synthesis and characterization

A composite of platelet-like orientated BiVO4 fused with MIL-125(Ti): Synthesis and characterization

Photocatalytic degradation of a basic dye in water by nanostructured HPEI/TiO2 containing membranes

Carbon Nanodots Embedded on a Polyethersulfone Membrane for Cadmium(II) Removal from Water

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