Article
Chemistry, Analytical
Nima Taghavi, Ali Akbar Amooey, Abdoliman Amouei, Hamed Tashakkorian
Summary: In this study, different types of clinoptilolite adsorbents were evaluated for the removal efficiency of 2,4,6-trichlorophenol. ImidClino showed the highest removal efficiency of 86% under certain conditions. Langmuir-Freundlich isotherm and pseudo-second order model had the most agreement with the experimental data for the adsorption process.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Physical
Mehdi Rouhani, Seyed Davoud Ashrafi, Kamran Taghavi, Mohammad Naimi Joubani, Jalil Jaafari
Summary: In this study, Fe3O4/Clinoptilolite nanocomposite was synthesized as a magnetic nanosorbent and used for the adsorption of tetracycline from aqueous solution. The results showed that Fe3O4/Clinoptilolite nanocomposite had a high adsorption capacity and removal efficiency, and was reusable.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Multidisciplinary
Amir Hossein Salimi, Ali Shamshiri, Ehsan Jaberi, Hossein Bonakdari, Azam Akhbari, Robert Delatolla, Mohammad Reza Hassanvand, Mohammad Agharazi, Yuk Feng Huang, Ali Najah Ahmed, Ahmed Elshafie
Summary: Nanotechnologies show promise in the production of potable water from natural sources through treatment. This study examines a simple method for preparing and modifying natural adsorbents using different acids and bases, with convenient desorption. Characterization techniques such as XRD, FT-IR, SEM, and TEM are used, along with the Response Surface Method to analyze the influence of operational variables. The results show optimal conditions for iron removal and the best isothermal model to describe the adsorption process.
AIN SHAMS ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Namitha Brijit Bejoy, Prahlad Roy Chowdhury, G. Naresh Patwari
Summary: The release of NO upon photodissociation of nitroaromatic compounds is influenced by the interaction between the NO2 group and substituent in the ortho position. The NO photofragment exhibits a bimodal translational energy distribution, indicating the presence of two distinct NO elimination pathways. The ratio of slow-to-fast NO release is controlled by the hydrogen bonding ability of the ortho substituent, with OH and NH2 favoring the roaming mechanism.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Environmental Sciences
Yibo Zhao, Lin Wang, Linchao Zhu, Fei Gao, Xinru Xu, Jingyi Yang
Summary: Steel slag was examined for its potential to remove p-nitrophenol from simulated sewage through batch adsorption and fixed-bed column absorption experiments. The results showed that steel slag exhibited excellent adsorption capacity and regeneration efficiency, indicating its potential application in wastewater treatment.
ENVIRONMENTAL RESEARCH
(2022)
Article
Chemistry, Analytical
Xing-Liang Cheng, Xu Xia, Qian-Qian Xu, Jun Wang, Jing-Chen Sun, Yongxing Zhang, Shan-Shan Li
Summary: In this study, FeSe2 with high electronic conductivity and large active area was successfully prepared and exhibited high sensitivity and low detection limit for PNP and ONP, showing impressive electrochemical performance attributed to the combined effect of adsorption and catalysis. The constructed FeSe2 modified electrode demonstrated superior selectivity, stability, reproducibility, and enabled the electrochemical detection of organic pollutants in water samples from subsidence areas.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Review
Environmental Sciences
Lisbania Velarde, Mohammad Sadegh Nabavi, Edwin Escalera, Marta-Lena Antti, Farid Akhtar
Summary: Water pollution is a global issue that threatens human health, particularly the safe supply of drinking water. Natural zeolites have shown promise in effectively removing heavy metals from contaminated water sources. This review examines the application of different natural zeolites for removing heavy metals such as arsenic, cadmium, chromium, lead, mercury, and nickel. Various chemical modifications of natural zeolites, as well as their sorption capacities and properties, are analyzed and compared. Clinoptilolite, in particular, is the most commonly used natural zeolite for heavy metal removal, demonstrating effectiveness against a range of heavy metals.
Article
Environmental Sciences
Thaisa Frossard Coslop, Ramiro Picoli Nippes, Rosangela Bergamasco, Mara Heloisa Neves Olsen Scaliante
Summary: Diazepam has been detected in water sources globally, impacting the quality of drinking water, prompting the search for effective removal methods. Using natural clinoptilolite zeolite as an adsorbent offers a cheap and eco-friendly solution to remove this drug from water. Experimental results demonstrate the significant potential of zeolite for adsorbing diazepam in water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Yi Liu, Shuanghui Zhao, Xiumei Qiu, Yi Meng, Hongquan Wang, Sen Zhou, Qiancheng Qiao, Chunjie Yan
Summary: This study demonstrates a simple method to prepare clinoptilolite-based zeolite-geopolymer foams. The obtained material possesses micropores of zeolite and meso/macropores of geopolymer matrix, and shows good static sorption performance for toxic heavy metals. The adsorption amounts for Cr3+, Pb2+, Ni2+, Cu2+, and Cd2+ are 6.21 mg/g, 6.11-6.13 mg/g, 5.92-6.07 mg/g, 5.53-5.93 mg/g, and 5.44-5.79 mg/g, respectively.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Chemistry, Physical
Barbara Kalebic, Nikola Skoro, Janez Kovac, Nevenka Rajic
Summary: This study investigated the regeneration of ciprofloxacin-containing clinoptilolite using non-thermal plasma treatment. The optimal parameters for plasma treatment were determined, and the results showed that the adsorption capacity of the natural clinoptilolite can be regenerated to at least 90% of its initial capacity.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Analytical
Bozena Vasilkovova, Elena Hajekova, Pavol Hudec, Jana Cesakova, Michal Hornacek, Michal Kalinak, Vladimir Jorik
Summary: Treated clinoptilolite with hydrochloric acid can effectively promote cracking of polypropylene into valuable gaseous and liquid hydrocarbons. The cracking activity is the highest with fresh catalyst, and the content of methylpropene in gas is significant. Although the cracking activity of unregenerated and regenerated catalysts slightly decreases, they are still effective in catalytic cracking of PP. The liquid fraction produced by all catalysts has a narrower range of hydrocarbons compared to thermal cracking.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Green & Sustainable Science & Technology
Yanan Qin, Junmei Luo, Yumeng Zhao, Congcong Yao, Yingyi Li, Qingda An, Zuoyi Xiao, Shangru Zhai
Summary: In this study, a composite biochar with enriched surface functional groups was prepared from shrimp shell and rice husk for efficient adsorption of p-nitrophenol. The composite biochar exhibited excellent adsorption performance in a wide pH range, and the pseudo-second-order kinetic model and Langmuir isotherm model were suitable for describing the adsorption behavior. The adsorption mechanisms involved chemisorption, physical adsorption, and pore filling. The tailored surface chemistry and high-efficiency of the composite biochar make it a potential candidate for water body remediation via adsorption process.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Lotfi Sellaoui, Luis F. O. Silva, Michael Badawi, Jawad Ali, Nathalia Favarin, Guilherme L. Dotto, Alessandro Erto, Zhuqi Chen
Summary: Experimental data shows that activated carbon produced from wastes deriving from a winery industry has different adsorption capacities for 2-nitrophenol and ketoprofen, with temperature playing a significant role. The modeling analysis suggests that a double layer model is suitable for describing the adsorption mechanisms, and the adsorption energy results indicate that physical interactions are responsible for the adsorption of the pollutants.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Environmental
Dominika Fila, Zbigniew Hubicki, Dorota Kolodynska
Summary: This study demonstrates a viable approach to increase the recovery potential of critical materials through biosorption. Environmentally friendly biosorbents were prepared and their adsorption performance and regeneration ability were investigated.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Fadya. M. Nasief, Mohamed Shaban, Khalid A. Alamry, Mostafa R. Abu Khadra, Aftab Aslam Parwaz Khan, Abdullah M. Asiri, H. M. Abd El-Salam
Summary: The research indicates that increasing activation time significantly enhances the adsorption capacity of natural zeolite, and synthetic zeolite along with activated natural zeolite show high efficiency in the removal of Ca/Mg total hardness. The adsorption process follows different kinetic models for synthetic zeolite and mechanically activated clinoptilolite, indicating their distinct adsorption mechanisms.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Chima B. Njoku, Ekemena Oseghe, Titus A. M. Msagati
Summary: Perovskite nanocomposites, CeCoO3 and SrCoO3-delta, were found to have good adsorption capacity for ketoprofen and fenoprofen. The adsorption capacity was influenced by pH, contact time, dye concentration, and adsorbent dose. The pseudo-second order model best described the adsorption kinetics. The D-R isotherm was suitable for ketoprofen adsorption, while the Freundlich isotherm was suitable for fenoprofen adsorption. Acetone or ethanol could effectively desorb the drugs from the loaded adsorbents.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Geosciences, Multidisciplinary
Offoro N. Kimambo, Jabulani R. Gumbo, Titus A. M. Msagati, Hector Chikoore
Summary: This study focused on the dynamics of harmful algal blooms, specifically cyanobacterial blooms, in the Ngerengere catchment in Tanzania. The study identified common species of cyanobacteria and examined their composition and changes over time. The study found that physico-chemical conditions, rainfall, and dry conditions influenced the dynamics of cyanobacteria blooms. The hydrological connectivity between fishponds and the Mindu Dam posed a threat to public health. Mitigative and adaptive measures are needed in the catchment to address cyanobacteria blooms.
PHYSICS AND CHEMISTRY OF THE EARTH
(2022)
Article
Engineering, Environmental
Welldone Moyo, Machawe M. Motsa, Nhamo Chaukura, Titus A. M. Msagati, Bhekie B. Mamba, Sebastiaan G. J. Heijman, Thabo T. I. Nkambule
Summary: This work presents the first comprehensive investigation of natural organic matter (NOM) fraction removal using ceramic membranes in South Africa. The study found that ceramic membranes achieved high removal rates for DOC and FDOM, regardless of the site of the water treatment plant. UV254 removal can serve as a proxy for the susceptibility of NOM to removal by ceramic membranes.
WATER ENVIRONMENT RESEARCH
(2022)
Review
Engineering, Chemical
Oranso T. Mahlangu, Machawe M. Motsa, Thabo Nkambule, Bhekie B. Mamba
Summary: This work critically reviews the application of various membrane separation processes in treating water polluted with trace organic compounds, paying attention to the mechanisms of rejection and the challenges in fouling and scaling. It also explores the potential of using renewable energy sources to drive energy intensive membrane separation processes.
REVIEWS IN CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Alusani Manyatshe, Zamani E. D. Cele, Mohammed O. Balogun, Thabo T. I. Nkambule, Titus A. M. Msagati
Summary: In this work, a biosorbent bio-composite consisting of pretreated sugarcane bagasse, chitosan, and epichlorohydrin was prepared and used for the adsorption of phosphate from aqueous media. The study showed that high solvent concentration enhanced the extraction of cellulose and pretreatment enhanced the compatibility between cellulose and chitosan. The addition of epichlorohydrin improved the adsorption capacity and stability of the biosorbent. Characterization techniques were used and batch studies showed that the biosorbent was pH dependent, selective, and recyclable.
CANADIAN JOURNAL OF CHEMISTRY
(2023)
Article
Engineering, Environmental
Matome Mothetha, Kefeni Kebede, Vhahangwele Masindi, Titus A. M. Msagati
Summary: This study meticulously reports the synergistic effects of mechanochemically synthesized metakaolinite-Ca-rich-MgO nanocomposite for effective treatment of acid mine drainage (AMD). Advanced analytical techniques and instruments, such as FTIR, HR-FIB/SEM, EDS, XRF, and XRD, were used to support the obtained results. Optimal conditions were observed for mixing time, feedstock dosage, temperature, and pH. The metal content in real AMD matrices was significantly reduced, and sulphate levels were greatly reduced. This study holds great promise for sustainable management of AMD effluents from coal mining activities.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Agronomy
Emmanuella Chioma Nnabuo-Eguzozie, Rose Waithiegeni Kibechu, Kennedy Uchenna Eguzozie, Khayalethu Ntushelo, Bhekie B. Mamba, Hlengilizwe Nyoni, Thabo T. I. Nkambule, Titus A. M. Msagati
Summary: The current study aimed to investigate metabolite regulations and nutrient assimilation patterns as biomarkers for waterborne fungal and spoilage bacterial intensities in greenhouse-cultivated tomato crops using advanced analytical techniques. The results could be applied for detecting and identifying biotic stress in tomato crops.
AGRICULTURAL RESEARCH
(2023)
Article
Microbiology
Thabile Lukhele, Titus Alfred Makudali Msagati
Summary: This study identified bacteria from extreme and polluted environments that have the potential to bioremediate microcystin-LR. These bacteria were able to grow optimally at alkaline pH and different concentrations of microcystin-LR, suggesting the use of a unique degradation pathway.
ARCHIVES OF MICROBIOLOGY
(2023)
Review
Agronomy
Emmanuella C. Nnabuo-Eguzozie, Rose W. Kibechu, Kennedy U. Eguzozie, Bhekie B. Mamba, Hlengilizwe Nyoni, Thabo T. I. Nkambule, Titus A. M. Msagati
Summary: A significant number of people worldwide suffer from diseases related to unsafe vegetable crops. Early identification of waterborne microbial pathogens affecting vegetable crops is crucial for disease control. Analytical techniques such as metabolomics and proteomics can be used to investigate secreted compounds and molecular biomarkers, which can be exploited to diagnose microbial pathogens and improve understanding of host-pathogen interactions.
Article
Polymer Science
Fulufhelo Hope Mudau, Francis Hassard, Machawe Mxolisi Motsa, Lueta-Ann De Kock
Summary: Multifunctional heterogeneous ion-exchange metal nanocomposite membranes were prepared and used for surface water desalination and bacterial inactivation under low-pressure conditions. The metal nanoparticles (Ag and Cu) were uniformly distributed on the surface and the interior of the nanocomposite membranes. Increasing the metal precursor solution concentration led to higher metal content and larger hydrodynamic diameter of the nanoparticles. The metal nanocomposite membranes exhibited improved ionic selectivity, higher antibacterial activity, and effective bacterial inactivation.
Article
Biochemistry & Molecular Biology
Deogratius T. Maiga, Rose W. Kibechu, Bhekie B. Mamba, Titus A. M. Msagati, Terence T. Phadi
Summary: In this study, functionalized mesoporous silica was successfully synthesized and evaluated as a promising stationary phase for solid-phase extraction (SPE) of polycyclic aromatic hydrocarbons (PAHs) in water samples. The synthesized sorbent exhibited outstanding performance in extracting PAHs, with high recovery rates and low limits of detection. The results demonstrate the effectiveness of the hybrid mesoporous silica as a stationary phase for sensitive detection of PAHs in water samples.
Article
Engineering, Environmental
Lerato Monatisa, Lueta A. de Kock, Bhekie B. Mamba, Thabo T. I. Nkambule, Azizallah Izady, Ali Al-Maktoumi, Titus A. M. Msagati
Summary: This paper presents the development of a model for early warning indication of pollution caused by oil produced water and as a predictive tool for compliance/noncompliance to wastewater discharge guidelines. The model was developed using physico-chemical measurements of oil-produced water samples from an oil refiner depot and evaporation rate patterns observed in a Class A evaporation Pan. Experimental data collected over six months in South Africa were used to develop a multiplicative model relating OPWE to influencing parameters. The developed model showed reasonably accurate estimation (RMSE = 0.49 mm) for OPWE and had potential for fingerprinting different OPWE compositions.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Review
Food Science & Technology
Celia Muzeza, Veronica Ngole-Jeme, Titus Alfred Makudali Msagati
Summary: The development of packaging technology, particularly the use of plastic materials, in the food industry has raised concerns about the potential migration of unreacted monomers into food, which can have adverse effects on human health. Many countries have implemented guidelines and regulations to control the levels of packaging monomers in food, but studies have shown that some food products exceed the set migration limits, raising concerns about consumer health effects.
Article
Biochemistry & Molecular Biology
Oranso Themba Mahlangu, Mxolisi Machawe Motsa, Faisal Ibney Hai, Bhekie Brilliance Mamba
Summary: In this study, PES UF membranes were modified with GO, Ag, ZnO, Ag-GO, and ZnO-GO nanoparticles to enhance carbamazepine removal and fouling prevention by increasing hydrophilicity. The membranes were characterized and evaluated for their effectiveness in removing MgSO4 and carbamazepine as well as their antifouling properties. The role of affinity interactions in rejection and fouling was investigated, and the addition of nanoparticles showed improvements in membrane properties and rejection/fouling prevention.
Article
Chemistry, Analytical
T. A. Makwakwa, D. Moema, H. Nyoni, T. A. M. Msagati
Summary: TOPSIS is a multi-criteria decision analysis tool that helps in ranking or selecting alternatives based on multiple criteria. In this study, TOPSIS methods based on objective mean weight and entropy weighting methods were used to evaluate the greenness of dispersive-extraction solvents used in DLLME for mifepristone extraction. The solvents were ranked based on attributes such as analytical performance, solvents greenness, and combination of analytical performance and solvent greenness. The best solvent pairs for mifepristone extraction were dichloroethane-acetone and chlorobenzene-tetrahydrofuran, weighted by mean and entropy weights respectively. Chloroform-acetone was found to be the most favorable option in terms of green chemistry. The performance of TOPSIS-MW and TOPSIS-Entropy was compared to simple additive weighting method and showed similar ranking observations.
