Treatment of a Nigerian covellite ore. Part II: extraction and purification of copper by tri-butyl-phosphate and enhanced β-diketones in kerosene

Balogun Ayo F.,Baba Alafara A.,Olaoluwa Daud T. 한국자원공학회 2023 Geosystem engineering Vol.26 No.6

Research was carried out to investigate the use of tributylphosphate (TBP) and enhanced β-diketones for extracting copper from covellite ore leach liquor. The effect of some parameters such as contact time, temperature, phase ratio, equilibrium pH, and extractant concentration on the extent of copper extraction was examined. For the following conditions: temperature 27 ± 2°C, phase ratio 1:1, extraction efficiency of 95.30% total copper was achieved using a mixture of 0.25 mol/L enhanced β-diketones + 0.10 mol/L TBP in kerosene within 15 minutes at pH of 7.8. Furthermore, the stripping of approximately 97.3% of pure copper from the loaded organic phase was successfully attained at optimal conditions. The hydrometallurgical flow chart summarizing the analytical operations for the extraction and recovery process was provided.

Multiset linear extensions with a heuristic algorithm

F. Balogun,D. Singh,S. Aliyu 원광대학교 기초자연과학연구소 2022 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.24 No.2

The paper presents the study of linear extensions on an ordered multiset structure. Results on linear extensions of a partially ordered set are generalized to multisets. A heuristic algorithm for generating these linear extensions is also presented.

Maximal and maximum antichains of ordered multisets

F. Balogun,D. Singh,Y. Tella 원광대학교 기초자연과학연구소 2021 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.21 No.1

This work studies the concept of maximal and maximum antichains on a partially ordered structure for which repetition is significant. By using set-based partitioning, maximal and maximum antichains of the ordered multiset structure are constructed. Analogous result on antichains and examples are also presented in this multiset setting.

Public health agencies’ use of social media for communication during pandemics: a scoping review of the literature

Babatunde Abiodun Balogun,Anne Hogden,Nenagh Kemp,Lin Yang,Maria Agaliotis 질병관리본부 2023 Osong Public Health and Research Persptectives Vol.14 No.4

Public health agencies (PHAs) have increasingly incorporated social media into their communication mix during successive pandemics in the 21st century. However, the quality, timing, and accuracy of their health messages have varied significantly, resulting in mixed outcomes for communication, audience engagement, and pandemic management. This study aimed to identify factors influencing the effectiveness of pandemic-related health messages shared by PHAs on social media and to report their impact on public engagement as documented in the literature. A scoping literature review was conducted following a predefined protocol. An electronic search of 7 relevant databases and 5 grey literature repositories yielded 9,714 papers published between January 2003 and November 2022. Seventy-three papers were deemed eligible and selected for review. The results underscored the insufficiency of social media guidance policies for PHAs. Six themes were identified: message source, message topic, message style, message timing, content credibility and reliability, and message recipient profile. These themes encompassed 20 variables that could inform PHAs’ social media public health communication during pandemics. Additionally, the findings revealed potential interconnectedness among the variables, and this study concluded by proposing a conceptual model that expands upon existing theoretical foundations for developing and evaluating pandemic-related health messaging.

A review of the phytochemistry and medicinal activities of the popular African food additive: Parkia biglobosa seed

Wasiu Gbolahan Balogun,Ismail Abiola Adebayo,Usman Yusuf,Azman Seeni 경희대학교 융합한의과학연구소 2018 Oriental Pharmacy and Experimental Medicine Vol.18 No.4

Food additives have been used for many decades, mainly to enhance food aesthetics and taste. However, considerable research attention has been placed on identifying food additives with additional medicinal benefits. Despite on-going efforts to document food additives with medicinal benefits, including the Food and Drug Administration database, many of such products have not yet been covered. Expanding the coverage of food additives with medicinal benefits could help accelerate drug discovery efforts. Here, we provide an update of the medicinal properties of the fermented seeds of the African locust bean (Parkia biglobosa), an example of less-known food additives. This condiment is commonly used in West and Central Africa. In this review, the chemical composition of P. biglobosa seeds has been highlighted as a cheap, reliable source of vital minerals and vitamins. The medicinal activities of P. biglobosa seeds include antihypertensive, anti-diabetes, wound healing and antioxidant activities. For a natural product to be accepted as a potential drug or supplement for food, its safety is important, hence, the safety concerns about this seed have been highlighted. The seeds can be considered safe as there are no reported side effects of the food additive. The review also discussed the future direction of research on the medicinal and nutritional values of the seeds. Finally, the medicinal activities identified from the seeds could be further explored for drug discovery.

Augmentation of antioxidant system: Contribution to antimalarial activity of Clerodendrum violaceum leaf extract

Elizabeth Abidemi Balogun,Ahmed Hauwa Zailani,Joseph Oluwatope Adebayo 셀메드 세포교정의약학회 2014 TANG Vol.4 No.4

Reactive oxygen species are known to mediate various pathological conditions associated with malaria. In this study, the antioxidant potential of Clerodendrum violaceum leaf extracts, an indigenous antimalarial remedy, was evaluated. Total phenol, flavonoid, selenium, vitamins C and E contents of Clerodendrum violaceum leaf extracts were determined. The free radical scavenging activities of the extracts against DPPH, superoxide anion and hydrogen peroxide coupled with their reducing power were also evaluated in vitro . Moreover, responses of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and glutathione reductase (GR) in a rodent malaria model to a 4-day administration of Clerodendrum violaceum leaf extracts were also evaluated. The methanolic extract was found to contain the highest amounts of antioxidant compounds/element and also demonstrated the highest free radical scavenging activity in vitro . The results showed a significant decrease ( p < 0.05) in SOD and CAT activities with a concurrent significant ( p < 0.05) increase in GPx and GR activities in both erythrocytes and liver of untreated Plasmodium berghei NK65-infected animals compared to the uninfected animals. The extracts were able to significantly increase ( p < 0.05) SOD and CAT activities and significantly reduce ( p < 0.05) GPx and GR activities in both the liver and erythrocytes compared to those observed in the untreated infected animals. The results suggest the augmentation of the antioxidant system as one of the possible mechanisms by which Clerodendrum violaceum extract ameliorates secondary effects of malaria infection, alongside its antiplasmodial effect in subjects.

Promotional effects of CO2 on the oxidative dehydrogenation of propane over mesoporous VOX/gAl2O3 catalysts

Majid Lasisi Balogun,Sagir Adamu,Mohammed S. Ba-Shammakh,Mohammad M. Hossain 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-

CO2 assisted oxidative dehydrogenation (ODH) propane to propylene overfluidizable mesoporous VOx/La2O3-gAl2O3 catalysts has been investigated. The mixed oxide of La2O3 and gAl2O3 were synthesized bythe co-precipitation technique and VOx was deposited on the supports by an incipient wetnessimpregnation approach. The prepared catalysts were characterized by various physicochemicalcharacterizations to establish the desired properties of the catalysts. The H2-TPR indicated the supportedVOx reduced in a single stage, indicating the formation of a homogeneous specie. Both the acidity andsurface area of the catalysts decreased with increase of La content, as confirmed by the NH3-TPD and BETanalysis, respectively. The CO2 assisted ODH of propane experiments were developed in afluidized CRECRiser Simulator at 520–600 C. The introduction of CO2 significantly enhanced both the propaneconversion and propylene selectivity. Among the studied catalysts, VOx/g-Al2O3 catalyst showed highestpropylene yields (42.7%) at 550 C.

The impact of urban green areas on the surface thermal environment of a tropical city: a case study of Ibadan, Nigeria

Ifeoluwa A. Balogun,Mojolaoluwa T. Daramola 대한공간정보학회 2019 Spatial Information Research Vol.27 No.1

This study assesses the relative impact of green areas on the surface thermal characteristics of an urban area. From this study, the existence of the Park Cool Island (PCI) around the green areas and surrounding zones of the green area was noted, as surface temperatures were lower at the green areas and higher at the outer boundaries. Agodi gardens had the highest vegetation cover of 62.1% and was the area with the lowest mean surface temperature (26.79 C), while Agugu green area had the lowest vegetation cover of 20.7% and had the highest mean surface temperature (27.75 C). Green areas with higher vegetation cover percentages had higher rate of change of PCI with buffer distance compared to the other two green areas that had lower percentages of vegetation cover. The green areas were identified for their cooling roles on surface temperature within the urban centres of Ibadan as the surface temperature intensities were of the order of 1–2 C lower within the 500-m buffer zone. The findings, therefore, brings to light the need for increased greenery within the urban areas of the city, and also provide information for urban planners and designers on the need for green spaces in mitigating heat island phenomenon in the city.

A hybrid approach for monitoring future thermal environment in tropical areas

I. A. Balogun,K. A. Ishola 대한공간정보학회 2018 Spatial Information Research Vol.26 No.2

The manifestation of urban heat, due to changes in the surface physical components, is a well recognized example of man’s alteration of the natural environment. In this study, an attempt was made to project the future urban thermal changes by integrating a statistical approach with remote sensing techniques. Landsat observed TM, ETM?, and TIRS/OLI data for the periods 1986, 2000, and 2014 were used to examine the spatio-temporal changes in land surface temperature associated with urbanization process in the tropical City of Akure, Nigeria. Quantitative analysis on the past and future (2028 and 2042) land surface temperature (LST) impacts of urban land cover change was carried out using a hybrid Cellular Automata/Markov (CA_Markov) model and a step-wise multiple regression model. The result of the projected LST ranged from 19.79 to 40.97 C in 2028, and from 20.68 to 44.15 C for 2042. It was found that there was no significant increase in the hybrid CA_Markov projected LST in the City centres when compared with earlier years. However, the sub-urban and rural areas that are undergoing rapid urbanisation processes, as confirmed in the literature, have been observed to transit from a low and medium to high thermal zones in 2028 and 2042.

Alice Springs Orogeny (ASO) Footprints Tracing in Fresh Rocks in Arunta Region, Central Australia, Using Uranium/Lead (U-Pb) Geochronology

Kouame Yao(Kouame Yao ),Mohammed O. Idrees(Mohammed O. Idrees ),Abdul-Lateef Balogun(Abdul-Lateef Balogun ),Mohamed Barakat A. Gibril(Mohamed Barakat A. Gibril ) 대한자원환경지질학회 2023 자원환경지질 Vol.56 No.6

This study investigates the age of the surficial rocks in the Arunta region using Uranium-Lead (U-Pb) geochronological dating. Rock samples were collected at four locations, Cattle-Water Pass (CP 1610), Gough Dam (GD 1622 and GD 1610), and London-Eye (LE 1601), within the Strangways Metamorphic Complex and crushed by selFragging. Subsequently, the zircon grains were imaged using Cathodoluminescence (CL) analysis and the U-Pb (uranium and lead) isotope ratios and the chrono-stratigraphy were measured. The imaged zircon revealed an anomalous heterogeneous crystal structure. Ellipses of the samples at locations GD1601, CP1610, and GD1622 fall below the intercept indicating the ages produced discordant patterns, whereas LE1601 intersects the Concordia curve at two points, implying the occurrence of an event of significant impact. For the rock sample at CP1610, the estimated mean age is 1742.2 ± 9.2 Ma with mean squared weighted deviation (MSWD) = 0.49 and probability of equivalence of 0.90; 1748 ± 15 Ma -MSWD = 1.02 and probability of equivalence of 0.40 for GD1622; and 1784.4 ± 9.1 Ma with MSWD of 1.09 and probability of equivalence of 0.37 for LE1601. But for samples at GD1601, two different age groups with different means occurred: 1) below the global mean (1792.2 ± 32 Ma) estimated at 1738.2 ± 14 Ma with MSWD of 0.109 and probability of equivalence of 0.95 and 2) above it with mean of 1838.22 ± 14 Ma, MSWD of 1.6 and probability of equivalence of 0.95. Analysis of the zircon grains has shown a discrepancy in the age range between 1700 Ma and 1800 Ma compared to the ASO dated to have occurred between 440 and 300 Ma. Moreover, apparent similarity in age of the core and rim means that the mineral crystallized relatively quickly without significant interruptions and effect on the isotopic system. This may have constraint the timing and extent of geological events that might have affected the mineral, such as metamorphism or hydrothermal alteration.