Sekomeng Johannes Modise

ORCID: 0000-0003-2025-2021
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Research Areas
  • Adsorption and biosorption for pollutant removal
  • TiO2 Photocatalysis and Solar Cells
  • Advanced Photocatalysis Techniques
  • Nanomaterials for catalytic reactions
  • Pickering emulsions and particle stabilization
  • Essential Oils and Antimicrobial Activity
  • Nanoparticles: synthesis and applications
  • Membrane-based Ion Separation Techniques
  • Pharmaceutical and Antibiotic Environmental Impacts
  • Extraction and Separation Processes
  • Membrane Separation Technologies
  • Heavy metals in environment
  • Chromium effects and bioremediation
  • Recycling and Waste Management Techniques
  • Synthesis and biological activity
  • Advanced Cellulose Research Studies
  • Environmental remediation with nanomaterials
  • Synthesis and Characterization of Heterocyclic Compounds
  • Advanced Nanomaterials in Catalysis
  • Phytochemistry and Biological Activities
  • Seaweed-derived Bioactive Compounds
  • Membrane Separation and Gas Transport
  • Nanopore and Nanochannel Transport Studies
  • Plant Disease Management Techniques
  • Steroid Chemistry and Biochemistry

Vaal University of Technology
2013-2025

University of South Africa
2024

Bingham University
2019-2023

North-West University
2001

The disinfection of wastewater using nanoparticles (NPs) has become a focal area research in water treatment. In this study, zinc oxide (ZnO) NPs were synthesized the microwave heating crystallization technique and characterized transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy X-ray diffraction (XRD). Qualitative well diffusion quantitative minimum inhibitory concentration (MIC) tests conducted to determine antimicrobial activity ZnO against selected...

10.3390/molecules27113532 article EN cc-by Molecules 2022-05-31

Toxins in water, such as metal ions and dyes, have become a global challenge to humanity by causing several serious illnesses. Removal of these toxins from water is needed for human health environmental concerns. This work investigated the use hemp seeds an environmentally friendly adsorbent applications treatment. Pristine (PHSs) were carbonized at 500 700 °C obtain carbon-based (CHS-500 CHS-700 removal cadmium methylene blue. The morphological functional groups adsorbents pristine...

10.3390/app13179659 article EN cc-by Applied Sciences 2023-08-26

The sorption of lead(II) onto pine cone powder (PCP) and 0.15 mol/L NaOH treated (PCP 0.15), an abundant agricultural waste from the wood industry, was studied to evaluate effect treatment on kinetics uptake by performing batch kinetic experiments. Batch biosorption performed varying biosorbent dose initial concentration data modeled using pseudo-first, pseudo-second intraparticle, Bangham diffusion models. results revealed that changed pattern kinetics, parameters, influenced rate-limiting...

10.1021/ie901150x article EN Industrial & Engineering Chemistry Research 2010-02-10

Prussian blue nanoparticles synthesized from K4[Fe(CN)6]3H2O and Fe(NO3)3.9H2O, were characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), Energy dispersive spectroscopy (EDS), Scanning electron microscopy (SEM), Raman spectroscopy. modified on a glassy carbon electrode as mediator of nanotube; three electrodes GC-Bare, GC-PB GC-CNT-PB fabricated. Cyclic voltammetry employed to characterize at pH ranges (3 - 7.4) in 0.1M phosphate buffer solution, the absence or...

10.1016/s1452-3981(23)19539-3 article EN cc-by-nc-nd International Journal of Electrochemical Science 2012-01-01

Macadamia nutshell powder oxidized by hydrogen peroxide solutions (MHP) was functionalized immobilizing 1,5'-diphenylcarbazide (DPC) on its surface. The effectiveness of grafting confirmed the Fourier transform infrared spectrum due to presence NH and C=C stretches at 3361, 1591, 1486 cm-1, respectively, grafted material which were absent in nongrafted material. Thermogravimetric analysis revealed that DPC surface shells lowered thermal stability from 300°C about 180°C owing volatile nature...

10.1155/2018/6171906 article EN cc-by Bioinorganic Chemistry and Applications 2018-01-01

 Galvanisation, a critical industrial process for rust prevention, generates effluents containing heavy metals and other pollutants, posing environmental health risks. This study evaluates the effectiveness of combined lime- anionic polyacrylamide (PAM) treatment to reduce these contaminants from effluent generated by galvanising industry in Gauteng, South Africa. Effluent samples were collected analysed (Cd, Cr, Cu, Pb, Zn, Mn, Fe) physicochemical parameters, including electrical...

10.24425/jwld.2025.153517 article EN cc-by-nc-nd Journal of Water and Land Development 2025-01-24

To evaluate the biological activities of Combretum erythrophyllum (C. erythrophyllum) leaf extracts against infectious diseases' pathogenesis and their cytotoxicity potentials.Powdered material (300 g) C. was extracted (1:10 w/v) using acetone to obtain crude extract. Liquid-liquid fractionation performed on extract (30 solvents different polarity. The bioautographic method used detect inhibition bacterial fungal growth by active compounds present in fractions. were then tested strains:...

10.1016/j.apjtm.2017.07.007 article EN Asian Pacific Journal of Tropical Medicine 2017-07-01

The occurrence of residual antifungal agents through indiscriminate prophylactic use and inappropriate disposal has been reported in wastewater treatment plants (WWTPs), surface water, groundwater environments. Opportunistic pathogenic aquatic yeasts develop resistance to commonly used continued exposure environmental waters. This poses a major public health concern. present review attempts provide brief description drugs, with focus on the most widely class azoles, as emerging contaminants...

10.1155/2021/9985398 article EN cc-by Applied and Environmental Soil Science 2021-11-05

Ubiquitous toxic metal ions and pathogenic microbes in contaminated water affects the lives of millions people globally. The synthesis multifunction composites that can uptake ion from simultaneously inhibit growth is a novel concept. This study developed composite substances fennel seeds impregnated with binary nanoparticles CuO-ZnO. These were used to remove Cr(VI) Escherichia coli Staphylococcus aureus. SEM analysis surface starting material showed various sizes shapes pores. In contrast,...

10.1016/j.enceco.2022.09.001 article EN cc-by-nc-nd Environmental Chemistry and Ecotoxicology 2022-01-01

Electroplating and metalworking industries produce enormous amounts of waste containing heavy metals in their effluents, leading to potential threats biotic abiotic life. According regulation, metal contamination must be kept within the regulated standard a few parts per million, which has led recent pique interest utilization nanofiltration technology for recovery. The effect feed pH, pressure, concentration, oxidation on rejection ions using three commercial membranes (NF, NF90, NF270)...

10.3390/membranes11090653 article EN cc-by Membranes 2021-08-26

Membrane separation processes tender a capable option for energy-demanding processes. Nanofiltration (NF) and reverse osmosis (RO) membranes are among the most explored, with latent use in chemical industry. In this study, four commercial (NF90, NF270, BW30, XLE) were investigated their applicability based on key structural performance characteristics recycling of Pd-based catalysts from Heck coupling post-reaction mixture. Pure water organic solvent permeabilities, uncharged solute...

10.3390/membranes10080166 article EN cc-by Membranes 2020-07-28

Potable water availability has been drastically reduced because of the indiscriminate discharge pharmaceuticals into rivers and surrounding areas. Polluted disrupts aquatic life affects human health. This study investigated potential using NaOH-activated maize cobs for removing Ibuprofen (IBP) from a synthetic solution. The sorption capacity base-treated cob (BMC) untreated (UMC) was compared. Batch adsorption experiments were conducted several parameters, including range pH values (2-10),...

10.1016/j.sajce.2023.09.002 article EN cc-by South African Journal of Chemical Engineering 2023-09-16

Contamination of water by Pb 2 + and the threat invasive vegetation affects quality quantity accessible to all life forms has become a primary concern South Africa world at large. This paper synthesized, characterized, evaluated resins from tannin-rich Acacia species as an environmentally benign adsorbent. The analysis pore volume surface area reveals small dimension 9 × 10−3 cc/g large (2.31–8.65 m2/g), presenting suitable physical parameters for adsorption . Langmuir model offers best...

10.3390/w10050648 article EN Water 2018-05-17

Pine cone powder is an agricultural waste material from the wood industry. In this investigation, chemical modification of pine using NaOH solution different concentrations (0.01, 0.05, 0.10, and 0.15 mol dm−3) was carried out. The changes in surface properties produced by ability modified products to remove copper(II) aqueous examined. Chemical characterization adsorbent FTIR Bohem titration showed that increase concentration wash found reduce amounts carboxyl phenolic groups iodine number....

10.5004/dwt.2010.1230 article EN cc-by-nc-nd Desalination and Water Treatment 2010-07-01

The emphasis of previous studies has targeted the development insulin mimic with little attention given to metabolic enzyme inhibitors. Our focus is synthesise nine o-hydroxy and p-nitro-azomethine analogues, investigate their digestive inhibitory capacity, as well antioxidant antimicrobial activities. substituted Schiff bases were analysed using thermal gravimetric analyser (TGA), X-ray diffractometer (XRD), nuclear magnetic resonance spectroscopy (NMR), elemental analyser,...

10.3390/antiox7090113 article EN cc-by Antioxidants 2018-08-28
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