
Daniel Shipwiisho LikiusUniversity of Namibia | UNAM · Department of Chemistry and Biochemistry
Daniel Shipwiisho Likius
PhD (Chemical Engineering)
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39
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Publications (39)
The Africa Capacity-Building Initiative is a Royal Society programme funded by the former UK Department for International Development to develop collaborative research between scientists in sub-Saharan Africa and the UK. Initially, four institutions were involved in the Chem4Energy consortium: Cardiff University in the UK and three African partners...
To study the antibacterial efficacy of metallic Ag nanoparticle/titania (Ag‐NP)/TiO2 composite thin films against Escherichia coli (ATCC 25922), COMP‐Agn with various amounts of Ag (10 mol% ≤ n ≤ 80 mol%) are fabricated on a quartz glass substrate at 600 °C using the molecular precursor method. The films are characterized by X‐ray diffraction, X‐ra...
Even with significant developments in nanoscience, fairly little is known about the interactions of nanocrystal semiconducting materials with bio-macromolecules. These interactions can influence the properties of both nanocrystals and bio-macromolecules. Understanding this interface is a condition to apply both nanoparticles and biomolecules for bi...
The TiO 2 thin film, Ag NP and three Ag‐NP/TiO 2 composite thin films (COMP‐Ag n; n = 20, 50, and 75 Ag mol%) were successfully fabricated on quartz glass. The optical properties of the composite electrodes were investigated, and the results indicate a surface plasmonic resonance peak at 410 nm while the electrical resistivity of the composite thin...
Due to its high specific surface area and rich porous structure, acacia-derived porous activated carbon is the most potentially effective material for wastewater treatment. This research study aimed to prepare activated carbon using Acacia erioloba seedpods as carbonaceous materials and phosphoric acid as an activating agent. The specific surface a...
Metal sulphides, including zinc sulphide (ZnS), are semiconductor photocatalysts that have been investigated for the photocatalytic degradation of organic pollutants as well as their activity during the hydrogen evolution reaction and water splitting. However, devising ZnS photocatalysts with a high overall quantum efficiency has been a challenge d...
A ruthenium bipyridyl-dye sensitizer (N) based on the naphthyl-thiazole anchoring-ancillary ligand was synthesized and characterized using spectroscopic methods of UV–Vis, 1H NMR, FTIR and fluorescence. The functional properties of N were investigated through its photoinduced and intramolecular based charge transfer mechanisms. Subsequently, N disp...
Hybrid density functional theory has been used to study the phase stability and formation of native point defects in Cu 4 O 3 . This intermediate copper oxide compound, also known as paramelaconite, was observed to be difficult to synthesize due to stabilization issues between mixed-valence Cu ¹⁺ and Cu ²⁺ ions. The stability range of Cu 4 O 3 was...
A novel protocol is developed for the first time for synthesis of Silver Nanoparticles (Ag-NPs). Ag-NPs were biologically synthesised using Pearl Millet (Pennisetum glaucum) husk. The Ag-NPs were investigated for their antimicrobial property against algae, and further Ag-NPs doped charcoal was explored for catalytic oxidation of benzyl alcohol in t...
A green catalysts are designed for environmentally benevolent and economic process that exhibits various applications in chemical industries. This chapter focuses on various types of heterogeneous catalysts for oxidation of alcohols with other oxidant’s i.e. 30 percent H2O2, reduction of alkyl aromatics, and substituted aromatic’s, acylation of aro...
This chapter summarizes on the combination of cellulose nano crystal nano fibrils based materials with titanium oxide. These materials promotes a novel functional toward the formation of cellulose nano crystals/nano fibrils and titanium oxides for waste water treatment. There have been excellent comparability between photocatalysts TiO2 and cellulo...
This review focusses on the recent developments in designing Layered Double Hydroxides (LDHs) with conductive, interlayer anion replacement, for efficient hydrogen fuel production by water splitting through Oxygen Evolution Reactions (OER) and Hydrogen Evolution Reactions (HER). Nickel nano structured catalysts improves OER performance are highligh...
Zinc oxide (ZnO) is a versatile and inexpensive semiconductor with a wide direct band gap that has applicability in several scientific and technological fields. In this work, we report the synthesis of ZnO thin films via two simple and low-cost synthesis routes, i.e., the molecular precursor method (MPM) and the sol–gel method, which were deposited...
Correction for ‘A colorimetric probe for the real-time naked eye detection of cyanide and hydroxide ions in tap water: experimental and theoretical studies’ by Veikko Uahengo et al. , Analyst , 2019, 144 , 6422–6431.
Gampocarpus fruticosus is a wild plant that belongs to the Asclepiadaceae family and has many traditional uses. The plant has demonstrated a significant level of microbial and phytochemical activity; the drugresistant strains of microbes and traditional uses which have emerged in the last decade will be eradicated by the compounds this indigenous p...
A naphthyl derivative colorimetric sensor (L) bearing hydrazone receptors was synthesized via a one-step reaction process, and its recognition properties towards biologically important anions in acetonitrile-water mixture were investigated by naked eye observation and spectroscopic methods of UV-Vis and 1H NMR analysis. The molar addition of anions...
A dinuclear ruthenium bipyridyl complex with 1,10-diaza-18-crown-6 bridging ligand was synthesized and characterized. Its photophysical and electrochemical properties were also studied. DFT computations were performed to complement the experimental investigations. Analysis of the results indicates that the path in which charges move from one metal...
The aim of this research study was to prepare activated carbon from Acacia erioloba (A. erioloba) seedpods and evaluate its application for water treatment. The prepared activated carbon was characterized by using different analytical techniques including; Fourier-transform infrared spectroscopy, scanning electron microscopy, Brunauer–Emmett–Teller...
Microporous and mesoporous silica catalysts, MCM-41, derived from zeolite type catalysts, are easily synthesized in laboratory scale and commercially available SiO2 have applications in reduction reactions. Nickel boride (Ni B) silica catalysts denoted as Cat A were characterized by XRD, IR, SEM, BET surface area and chemisorption studies. Nickel b...
The need of sustainable and environment friendly alternate source of energy has gained importance, due to the awareness of adverse effects of conventional fuels to the environment. Biodiesel fuel is known to have better properties than petro-diesel fuel such as, non-toxic, biodegradable, renewable and essentially free of sulfur and aromatics. This...
Herein this article highlights the everlasting importance of catalysts in industry to synthesize value added products in chemical industry specifically focusing on
pharmaceutical industry. Where large amount of drugs are produced annually and the importance of catalysts is coming into play always. There are many reactions where which do not undergo...
A benzotrithiophenes (BTT) based colorimetric sensor (2) was synthesized via a simple one-step reaction process, and its recognition properties towards several biologically important anions and cations were investigated by naked eye observation and spectroscopic methods of UV-vis and 1 H NMR analysis in DMSO. The molar addition of anions such as F...
A naphthalo-1, 8-bis[(2,4-dinitrophenyl)hydrazone] sensor (K) was synthesized and characterized using UV-vis, 1H NMR and fluorescence spectroscopy. The sensor showed strong colorimetric and spectral response upon the molar addition of acetate or fluoride ion (AcO- or F-) in acetonitrile. The complexed state (KF or KAcO) of the system showed signifi...
The borane chemistry has continued to expand since the beginning of the twentieth century. It has deeply penetrated into the other fields such as organic chemistry, inorganic chemistry, organo metallic chemistry, catalysis, and medicinal fields. Yet some of the average chemists or chemists at an undergraduate or even postgraduate levels find it a c...
To study the absorption spectra and photocurrent densities of metallic Ag nanoparticle/titania (Ag NP)/TiO2 composite thin films, COMP-Agn, with various amounts of Ag (10 mol% a parts per thousand currency signn a parts per thousand currency sign80 mol%) were fabricated on a quartz glass substrate at 600 A degrees C using the molecular precursor me...
The Ag-nanoparticles (Ag-NP)/TiO2 composite thin films with various amounts of Ag (10 mol% <= n <= 80 mol%) were examined as a potential photocatalyst by decoloration reaction of methylene blue (MB) in an aqueous solution. These composite thin films of ca. 100 nm thickness were fabricated by the MPM at 600 degrees C in air. The decoloration rates m...
To find the percolation threshold for the electrical resistivity of metallic Ag-nanoparticle/titania composite thin films, Ag-NP/titania composite thin films, with different volumetric fractions of silver (0.26 a parts per thousand currency sign phi(Ag) a parts per thousand currency sign 0.68) to titania, were fabricated on a quartz glass substrate...
Some sulphur-based ligands and their corresponding Cu(II) and Zn(II) complexes were tested in vitro against malaria parasite. The ligands were found to be devoid of biological activity. However, the corresponding metal complexes have been found to exhibit modest biological activity against the parasite when bound to Cu(II) and Zn(II) metal ions. On...
Metal complexes of Manganese (II), Iron(II), Cobalt(II), Nickel (II), Copper (II), Zinc (II) and Cadmium (II) containing a sulphur-nitrogen ligand were subjected to biological tests on falcipain-2 (FP-2) and falcipain-3 (FP-3) cysteine protease enzymes from the malaria parasite plasmodium falciparum. They were further tested in vitro against chloro...