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Synthesis and application of choline chloride based deep eutectic solvents in liquid-liquid and solid-liquid assisted extraction of organophosphorus flame retardants from landfill leachate and sediment

International Journal of Environmental Analytical Chemistry
2024-12-20 | Journal article
Contributors: Innocentia Velaphi Sibiya; Adegbenro Peter Daso; Okechukwu Jonathan Okonkwo
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Crossref

Defluoridation of water through the application of carbonised bone as a green adsorbent: A review

South African Journal of Science
2024-01-30 | Journal article
Contributors: Sello P. Moloi; Jonathan O. Okonkwo; Raymond Jansen
Source: check_circle
Crossref

Selected trace element concentrations in run-of-mine coal, discard, and coal product, and environmental implications

Journal of the Southern African Institute of Mining and Metallurgy
2024-01-25 | Journal article
Contributors: R.M. Mashishi; O.J. Okonkwo; T. Malehase
Source: check_circle
Crossref

Polybrominated diphenyl ethers in the grey-headed gull (Larus cirrocephalus) and African sacred ibis (Threskiornis aethiopicus)

Environmental Science: Advances
2023 | Journal article
Contributors: C. Emereole; R. Jansen; O. J. Okonkwo
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Crossref

Batch equilibrium studies on the adsorptive capacity of powdered and pelleted maize tassel to remove PFOA and PFOS from aqueous medium

Emerging Contaminants
2022 | Journal article
Contributors: Pinky Mokwena; O.J. Okonkwo
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Crossref

Legacy and novel brominated flame-retardants in different fish types from inland freshwaters of South Africa: levels, distribution and implications for human health

International Journal of Environmental Health Research
2022-02-01 | Journal article
Contributors: Tlou B. Chokwe; Elmari Krȕger; Makhosazane N. Magubane; Ovokeroye A. Abafe; Simon M. Mporetji; Jonathan O. Okonkwo; Linda L. Sibali; Reveck Hariram
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Poly-and perfluorinated substances in environmental water from the hartbeespoorand roodeplaat dams, South Africa

Water SA
2021 | Journal article
EID:

2-s2.0-85100052339

Part of ISSN: 18167950 03784738
Contributors: Batayi, B.; Okonkwo, O.J.; Daso, A.P.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Removal of per- and polyfluoroalkyl substances from aqueous media using synthesized silver nanocomposite-activated carbons

Journal of Environmental Health Science and Engineering
2021 | Journal article
EID:

2-s2.0-85099204882

Part of ISSN: 2052336X
Contributors: Omo-Okoro, P.N.; Curtis, C.J.; Marco, A.M.; Melymuk, L.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

A review of sources, fate, levels, toxicity, exposure and transformations of organophosphorus flame-retardants and plasticizers in the environment

Emerging Contaminants
2020 | Journal article
Contributors: Tlou B. Chokwe; Ovokeroye A. Abafe; Senzy P. Mbelu; Jonathan O. Okonkwo; Linda L. Sibali
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Ecological risk assessment of organochlorine pesticides and polychlorinated biphenyls in water and surface sediment samples from Akaki River catchment, central Ethiopia

Emerging Contaminants
2020 | Journal article
Contributors: Alemnew Berhanu Kassegne; Jonathan O. Okonkwo; Tarekegn Berhanu; Adegbenro P. Daso; Olubiyi I. Olukunle; Seyoum Leta Asfaw
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Kinetics, Isotherm, and Thermodynamic Studies of the Adsorption Mechanism of PFOS and PFOA Using Inactivated and Chemically Activated Maize Tassel

Water, Air, and Soil Pollution
2020 | Journal article
EID:

2-s2.0-85090393698

Part of ISSN: 15732932 00496979
Contributors: Omo-Okoro, P.N.; Curtis, C.J.; Karásková, P.; Melymuk, L.; Oyewo, O.A.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Microwave-Assisted Synthesis and Characterization of an Agriculturally Derived Silver Nanocomposite and Its Derivatives

Waste and Biomass Valorization
2020 | Journal article
EID:

2-s2.0-85057616352

Part of ISSN: 1877265X 18772641
Contributors: Omo-Okoro, P.N.; Maepa, C.E.; Daso, A.P.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Poly- and perfluoroalkyl substances (PFASs) in sediment samples from Roodeplaat and Hartbeespoort Dams, South Africa

Emerging Contaminants
2020 | Journal article
EID:

2-s2.0-85091249301

Part of ISSN: 24056642 24056650
Contributors: Batayi, B.; Okonkwo, J.O.; Daso, P.A.; Rimayi, C.C.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Influence of particle size and total organic carbon on the distribution of polybrominated diphenyl ethers in landfill soils: assessment of exposure implications

Journal of Analytical Science and Technology
2019 | Journal article
EID:

2-s2.0-85071265427

Part of ISSN: 20933371 20933134
Contributors: Akortia, E.; Lupankwa, M.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Leachate seepage from landfill: A source of groundwater mercury contamination in South Africa

Water SA
2019 | Journal article
EID:

2-s2.0-85072651626

Part of ISSN: 18167950 03784738
Contributors: Nevondo, V.; Malehase, T.; Daso, A.P.; Okonkwo, O.J.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Levels, distributions, and ecological risk assessments of polybrominated diphenyl ethers and alternative flame retardants in river sediments from Vaal River, South Africa

Environmental Science and Pollution Research
2019 | Journal article
EID:

2-s2.0-85060127377

Part of ISSN: 16147499 09441344
Contributors: Chokwe, T.B.; Magubane, M.N.; Abafe, O.A.; Okonkwo, J.O.; Sibiya, I.V.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Occurrence, distribution and ecological risk assessment of organophosphorus flame retardants and plasticizers in sediment samples along the Vaal River catchment, South Africa

Emerging Contaminants
2019 | Journal article
EID:

2-s2.0-85066335567

Part of ISSN: 24056642 24056650
Contributors: Chokwe, T.B.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Propensity of Tagetes erecta L., a medicinal plant commonly used in diabetes management, to accumulate perfluoroalkyl substances

Toxics
2019 | Journal article
EID:

2-s2.0-85063958796

Part of ISSN: 23056304
Contributors: Mudumbi, J.B.N.; Daso, A.P.; Okonkwo, O.J.; Ntwampe, S.K.O.; Matsha, T.E.; Mekuto, L.; Itoba-Tombo, E.F.; Adetunji, A.T.; Sibali, L.L.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Targeted and non-target screening of persistent organic pollutants and organophosphorus flame retardants in leachate and sediment from landfill sites in Gauteng Province, South Africa

Science of the Total Environment
2019 | Journal article
EID:

2-s2.0-85056242232

Part of ISSN: 18791026 00489697
Contributors: Sibiya, I.; Poma, G.; Cuykx, M.; Covaci, A.; Daso Adegbenro, P.; Okonkwo, J.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Water hyacinth modified carbon paste electrode for simultaneous electrochemical stripping analysis of Cd (II) and Pb (II)

International Journal of Environmental Analytical Chemistry
2019 | Journal article
EID:

2-s2.0-85059566390

Part of ISSN: 10290397 03067319
Contributors: Jackfama, T.; Moyo, M.; Nharingo, T.; Shumba, M.; Okonkwo, J.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Assessment of trace metals in water samples and tissues of African catfish (Clarias gariepinus) from the Akaki River Catchment and the Aba Samuel Reservoir, central Ethiopia

African Journal of Aquatic Science
2019-12-06 | Journal article
Contributors: AB Kassegne; T Berhanu; JO Okonkwo; S Leta
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Recent advances in sorbents applications and techniques used for solid-phase extraction of atrazine and its metabolites deisopropylatrazine and deethylatrazine: a review

International Journal of Environmental Analytical Chemistry
2019-09-02 | Journal article
Contributors: Bongeka Mavumengwana-Khanyile; Zainab Katima; Everlyne A. Songa; Jonathan O. Okonkwo
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Crossref
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Preferred source (of 2)‎

A review of the application of agricultural wastes as precursor materials for the adsorption of per- and polyfluoroalkyl substances: A focus on current approaches and methodologies

Environmental Technology and Innovation
2018 | Journal article
EID:

2-s2.0-85036495311

Part of ISSN: 23521864
Contributors: Omo-Okoro, P.N.; Daso, A.P.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Determination of legacy and novel brominated flame retardants in dust from end of life office equipment and furniture from Pretoria, South Africa

Science of the Total Environment
2018 | Journal article
EID:

2-s2.0-85036663058

Part of ISSN: 18791026 00489697
Contributors: Nkabinde, S.N.; Okonkwo, J.O.; Olukunle, O.I.; Daso, A.P.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Distribution of total mercury in surface sediments and African catfish (Clarias gariepinus) from Akaki River catchment and Aba Samuel Reservoir, downstream to the mega-city Addis Ababa, Ethiopia

Emerging Contaminants
2018 | Journal article
EID:

2-s2.0-85055731792

Part of ISSN: 24056642 24056650
Contributors: Kassegne, A.B.; Okonkwo, J.O.; Esho, T.B.; Mekonnen, K.N.; Malehase, T.; Asfaw, S.L.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Simultaneous oxidative determination of antibacterial drugs in aqueous solutions using an electrode modified with MWCNTs decorated with Fe<inf>3</inf>O<inf>4</inf> nanoparticles

New Journal of Chemistry
2018 | Journal article
EID:

2-s2.0-85044476900

Part of ISSN: 13699261 11440546
Contributors: Bhengo, T.; Moyo, M.; Shumba, M.; Okonkwo, O.J.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

The occurrence of brominated flame retardants in the atmosphere of Gauteng Province, South Africa using polyurethane foam passive air samplers and assessment of human exposure

Environmental Pollution
2018 | Journal article
EID:

2-s2.0-85054749240

Part of ISSN: 18736424 02697491
Contributors: Katima, Z.J.; Olukunle, O.I.; Kalantzi, O.-L.; Daso, A.P.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Voltammetric sensing of nitrite in aqueous solution using titanium dioxide anchored multiwalled carbon nanotubes

Ionics
2018 | Journal article
EID:

2-s2.0-85035140218

Part of ISSN: 18620760 09477047
Contributors: Moyo, M.; Mudarikwa, P.; Shumba, M.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

A review of brominated flame retardants in the environment with emphasis on atmospheric levels, knowledge and information gaps in the African continent

Atmospheric Pollution Research
2017 | Journal article
EID:

2-s2.0-85011324213

Part of ISSN: 13091042
Contributors: Katima, Z.; Okonkwo, J.O.; Daso, A.P.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Alkylphenols and alkylphenol ethoxylates in dust from homes, offices and computer laboratories: Implication for personal exposure via inadvertent dust ingestion

Emerging Contaminants
2017 | Journal article
EID:

2-s2.0-85044041338

Part of ISSN: 24056642 24056650
Contributors: Abafe, O.A.; Chokwe, T.B.; Okonkwo, J.O.; Martincigh, B.S.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Distribution, exposure pathways, sources and toxicity of nonylphenol and nonylphenol ethoxylates in the environment

Water SA
2017 | Journal article
EID:

2-s2.0-85033382806

Part of ISSN: 18167950 03784738
Contributors: Chokwe, T.B.; Okonkwo, J.O.; Sibali, L.L.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Electrodeposition of zinc oxide nanoparticles on multiwalled carbon nanotube-modified electrode for determination of caffeine in wastewater effluent

International Journal of Environmental Analytical Chemistry
2017 | Journal article
EID:

2-s2.0-85020505505

Part of ISSN: 10290397 03067319
Contributors: Muzvidziwa, T.; Moyo, M.; Okonkwo, J.O.; Shumba, M.; Nharingo, T.; Guyo, U.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Initiatives to combat mercury use in artisanal small-scale gold mining: A review on issues and challenges

Environmental Reviews
2017 | Journal article
EID:

2-s2.0-85020085801

Part of ISSN: 11818700
Contributors: Malehase, T.; Daso, A.P.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Occurrence and distribution of tetrabromobisphenol A and its derivative in river sediments from Vaal River Catchment, South Africa

Emerging Contaminants
2017 | Journal article
EID:

2-s2.0-85042122493

Part of ISSN: 24056642 24056650
Contributors: Chokwe, T.B.; Okonkwo, J.O.; Nwamadi, M.S.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Occurrence and environmental levels of triclosan and triclocarban in selected wastewater treatment plants in Gauteng Province, South Africa

Emerging Contaminants
2017 | Journal article
EID:

2-s2.0-85042074613

Part of ISSN: 24056642 24056650
Contributors: Lehutso, R.F.; Daso, A.P.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Preliminary screening of polybrominated diphenyl ethers (PBDEs), hexabromocyclododecane (HBCDD) and tetrabromobisphenol A (TBBPA) flame retardants in landfill leachate

Environmental Monitoring and Assessment
2017 | Journal article
EID:

2-s2.0-85026675919

Part of ISSN: 15732959 01676369
Contributors: Daso, A.P.; Rohwer, E.R.; Koot, D.J.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Seasonal variations and the influence of geomembrane liners on the levels of PBDEs in landfill leachates, sediment and groundwater in Gauteng Province, South Africa

Emerging Contaminants
2017 | Journal article
EID:

2-s2.0-85036609450

Part of ISSN: 24056642 24056650
Contributors: Sibiya, I.V.; Olukunle, O.I.; Okonkwo, O.J.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Soil concentrations of polybrominated diphenyl ethers and trace metals from an electronic waste dump site in the Greater Accra Region, Ghana: Implications for human exposure

Ecotoxicology and Environmental Safety
2017 | Journal article
EID:

2-s2.0-85005992118

Part of ISSN: 10902414 01476513
Contributors: Akortia, E.; Olukunle, O.I.; Daso, A.P.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

The impact of a Wastewater Treatment Works in Southern Gauteng, South Africa on efavirenz and nevirapine discharges into the aquatic environment

Emerging Contaminants
2017 | Journal article
EID:

2-s2.0-85036662661

Part of ISSN: 24056642 24056650
Contributors: Schoeman, C.; Dlamini, M.; Okonkwo, O.J.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

A review of sources, levels, and toxicity of polybrominated diphenyl ethers (PBDEs) and their transformation and transport in various environmental compartments

Environmental Reviews
2016 | Journal article
EID:

2-s2.0-84987638502

Part of ISSN: 11818700
Contributors: Akortia, E.; Okonkwo, J.O.; Lupankwa, M.; Osae, S.D.; Daso, A.P.; Olukunle, O.I.; Chaudhary, A.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Biosorption of Pb(II) from aqueous solution using Rooibos shoot powder (RSP)

Desalination and Water Treatment
2016 | Journal article
EID:

2-s2.0-84955693118

Part of ISSN: 19443986 19443994
Contributors: Kanu, S.A.; Moyo, M.; Zvinowanda, C.M.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Concentration profiles, source apportionment and risk assessment of polycyclic aromatic hydrocarbons (PAHs) in dumpsite soils from Agbogbloshie e-waste dismantling site, Accra, Ghana

Environmental Science and Pollution Research
2016 | Journal article
EID:

2-s2.0-84958811538

Part of ISSN: 16147499 09441344
Contributors: Daso, A.P.; Akortia, E.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Determination of mercury and its fractionation products in samples from legacy use of mercury amalgam in gold processing in Randfontein, South Africa

Emerging Contaminants
2016 | Journal article
EID:

2-s2.0-85020924264

Part of ISSN: 24056642 24056650
Contributors: Malehase, T.; Daso, A.P.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Hazard assessment of microcystins from the household’s drinking water

Applied Ecology and Environmental Research
2016 | Journal article
EID:

2-s2.0-84977537417

Part of ISSN: 17850037 15891623
Contributors: Mokoena, M.M.; Mukhola, M.S.; Okonkwo, O.J.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Occurrence and Distribution Pattern of Alkylphenol Ethoxylates and Brominated Flame Retardants in Sediment Samples from Vaal River, South Africa

Bulletin of Environmental Contamination and Toxicology
2016 | Journal article
EID:

2-s2.0-84979281174

Part of ISSN: 14320800 00074861
Contributors: Chokwe, T.B.; Okonkwo, O.J.; Sibali, L.L.; Mporetji, S.M.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Recent approaches to improving selectivity and sensitivity of enzyme-based biosensors for organophosphorus pesticides: A review

Talanta
2016 | Journal article
EID:

2-s2.0-84979948904

Part of ISSN: 00399140
Contributors: Songa, E.A.; Okonkwo, J.O.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Alkylphenol ethoxylates and brominated flame retardants in water, fish (carp) and sediment samples from the Vaal River, South Africa

Environmental Science and Pollution Research
2015 | Journal article
EID:

2-s2.0-84937961854

Part of ISSN: 16147499 09441344
Contributors: Chokwe, T.B.; Okonkwo, J.O.; Sibali, L.L.; Ncube, E.J.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

An integrated method for the simultaneous determination of alkylphenol ethoxylates and brominated flame retardants in sewage sludge samples by ultrasonic-assisted extraction, solid phase clean-up, and GC-MS analysis

Microchemical Journal
2015 | Journal article
EID:

2-s2.0-84955277322

Part of ISSN: 0026265X
Contributors: Chokwe, T.B.; Okonkwo, J.O.; Sibali, L.L.; Ncube, E.J.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Concentration of novel brominated flame retardants and HBCD in leachates and sediments from selected municipal solid waste landfill sites in Gauteng Province, South Africa

Waste Management
2015 | Journal article
EID:

2-s2.0-84938751154

Part of ISSN: 18792456 0956053X
Contributors: Olukunle, O.I.; Okonkwo, O.J.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier

Extraction and Characterization of Natural Cellulose Fibers from Maize Tassel

International Journal of Polymer Analysis and Characterization
2015 | Journal article
EID:

2-s2.0-84922381675

Part of ISSN: 15635341 1023666X
Contributors: Maepa, C.E.; Jayaramudu, J.; Okonkwo, J.O.; Ray, S.S.; Sadiku, E.R.; Ramontja, J.
Source: Self-asserted source
Okechukwu Jonathan Okonkwo via Scopus - Elsevier
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Peer review (22 reviews for 9 publications/grants)

Review activity for Chemosphere. (7)
Review activity for Environmental pollution (4)
Review activity for Environmental science and pollution research international (2)
Review activity for Environmental science and pollution research international (3)
Review activity for Journal of environmental chemical engineering. (1)
Review activity for Journal of hazardous materials. (1)
Review activity for Marine pollution bulletin. (1)
Review activity for Science of the total environment. (2)
Review activity for Surfaces and interfaces. (1)