Surface oxidation of activated carbon pellets by hydrogen peroxide for preparation of CO2 adsorbent

Adedeji A. Adelodun,임윤희,조영민 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4

This work attempted to use H2O2 as an oxidant for the incorporation of surface oxygen functionalities (SOFs) on activated carbon in the preparation of a CO2 adsorbent. Experimental results showed that oxidation at lowered temperature improved both structural and chemical properties more than those at ambient temperature, although oxidation at this temperature with 30% H2O2 incorporated the highest amount of useful SOFs for amination purpose. pHpzc value was most significantly reduced by altering the temperature either way while dilution seemed to have positive impact regarding this property. Pretreatment ultimately enhanced the selectivity for CO2 adsorption as well as its capacity.

A Test of Relative Removal Properties of Various Offensive Odors by Zeolite

Adedeji A. Adelodun,Kowsalya Vellingiri,전병훈,오종민,Sandeep Kumar,김기현 한국대기환경학회 2017 Asian Journal of Atmospheric Environment (AJAE) Vol.11 No.1

The adsorptive removal properties of synthetic A4 zeolite were investigated against a total of 16 offensive odors consisting of reduced sulfur compounds (RSCs), nitrogenous compounds (NCs), volatile fatty acids (VFAs), and phenols/indoles (PnI). Removal of these odors was measured using a laboratory-scale impinger-based adsorption setup containing 25 g of the zeolite bed (flow rate of 100 mL min-1). The high est and lowest breakthrough (%) values were shown for PnIs and RSCs, respectively, and the maximum and minimum adsorption capacity (μg g-1) of the zeolite was observed for the RSCs (range of 0.77-3.4) and PnIs (0.06-0.104), respectively. As a result of sorptive removal by zeolite, a reduction in odor strength, measured as odor intensity (OI), was recorded from the minimum of approximately 0.7 OI units (indole [from 2.4 to 1.6]), skatole [2.2 to 1.4], and p-cresol [5.1 to 4.4]) to the maximum of approximately 4 OI units (methanethiol [11.4 to 7.5], n-valeric acid [10.4 to 6.5], i-butyric acid [7.9 to 4.4], and propionic acid [7.2 to 3.7]). Likewise, when removal was examined in terms of odor activity value (OAV), the extent of reduction was significant (i.e., 1000-fold) in the increasing order of amy acetate, ibutyric acid, phenol, propionic acid, and ammonia.

Influence of Operation Conditions on the Performance of Non-thermal Plasma Technology for VOC Pollution Control

Adedeji A. Adelodun 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-

The viability of non-thermal plasma (NTP) systems for the treatment of various VOC types was assessed. Also evaluated were the individual and collective influences of selected process parameters on the NTP-VOC systems’ performances. To this end, the process and performance evaluations of the reported NTP-VOC pairs, based on the established (VOC molecular weight, input voltage, specific input energy (SIE),flow rate, and degradation efficiency) and calculated (processing rate, system efficiency, cumulativeenergy density (e), and space-time yield) parameters were reported. With a catalyst, an increase in thegasflow rate enhanced the processing rate of the system by approximately 50%. At the same time, theinfluence of a on the byproducts remains unpredictable. Also, the correlation values of the processing rateagainst the system efficiency were significantly high and positive (0.9423). About 87% of the calculatedattributes correlated with the double-barrier discharge reactor. Theflow rate and input voltage evincedas the most influential parameters for all NTP-VOC systems. Moreover, the estimated e (J/L) is morereliable than the SIE for performance comparison. Conclusively, the processing rate, space-time yield, andenergy density are the derived attributes that should be considered before any NTP-VOC process design.

Evaluation of SSYA10-001 as a Replication Inhibitor of Severe Acute Respiratory Syndrome, Mouse Hepatitis, and Middle East Respiratory Syndrome Coronaviruses

Adedeji, Adeyemi O.,Singh, Kamalendra,Kassim, Ademola,Coleman, Christopher M.,Elliott, Ruth,Weiss, Susan R.,Frieman, Matthew B.,Sarafianos, Stefan G. American Society for Microbiology 2014 Antimicrobial Agents and Chemotherapy Vol.58 No.8

<P>We have previously shown that SSYA10-001 blocks severe acute respiratory syndrome coronavirus (SARS-CoV) replication by inhibiting SARS-CoV helicase (nsp13). Here, we show that SSYA10-001 also inhibits replication of two other coronaviruses, mouse hepatitis virus (MHV) and Middle Eastern respiratory syndrome coronavirus (MERS-CoV). A putative binding pocket for SSYA10-001 was identified and shown to be similar in SARS-CoV, MERS-CoV, and MHV helicases. These studies show that it is possible to target multiple coronaviruses through broad-spectrum inhibitors.</P>

Antifungal Activity of Lagenaria breviflora Fruit Extracts Against Wood Rotting Fungi on Vitex doniana Wood

Adedeji, Gabriel Adetoye,Eguakun, Funmilayo Sarah,Elufloye, Taiwo Olayemi,Uriel, Tamunobubeleye Institute of Forest Science 2017 Journal of Forest Science Vol.33 No.4

As a result of contemporary environmental concerns, a number of studies from plants' tissues as one of the alternatives to conventional chemicals are increasingly investigated. In tandem with these trends, Lagenaria breviflora (LB) fruit, reputed as antiviral and depilatory agents in the Yoruba folkloric medicine was examined on Vitex doniana wood to ascertain its antifungal activity. Fungicides of 25%, 50%, 75%, and 100% LB fruits formulations (concentrations) were developed through simple one-step mechanical-forming process, including control. In this study, the yield, the chemical compositions, the absorption capacity of the fungicides and wood weight losses (WWL) analysis were evaluated to investigate the antifungal activity of LB fruit on wood. The fruit extract yielded 35.4% of fresh juice weight. LB fruits contained total: alkaloids ($8.78{\pm}0.21mg/mL$), flavonoids ($2.01{\pm}0.02mg/mL$), phenol ($7.42{\pm}0.09mg/mL$), saponins ($11.00{\pm}0.10mg/mL$) and tannins ($5.47{\pm}0.05mg/mL$) contents. All the formulations provided effective protection against the tested wood fungi compared to control. Interestingly, the antifungal activity of 50% and 25% formulations of 6.8% WWL and 9.9% WWL satisfied the excellent fungal resistance class description against white rot fungus (Ganoderma lucidum) and brown rot fungus (Fibroporia vaillantii), respectively according to ASTM D 2017. These results thus, support LB fruit as a strong potential source of natural antifungals for industrial wood production.

Ingroup-Outgroup Structure of Cybercrime Network in Lagos Metropolis

Adedeji Oyenuga 한국디지털포렌식학회 2019 디지털 포렌식 연구 Vol.13 No.1(UNODC특별호 )

The increasing accessibility to the Internet, as well as its evolving global dependence, is marred by new waves of crimes such as website cloning and letter scam. The cyberspace is one environment where cybercriminals are evasive. Although there were studies on cybercrime, little attention has been paid to the internal structure and external network of cybercrime as an organized crime. This study, therefore, examined the internal structure of youth involved in cybercrime, the out-group facilitating structure of cybercrime in the light of the identified techniques of cybercrime in Lagos State. The study adopted diffusion of innovation, gang and space transition theories. The study design was exploratory involving the use of qualitative methods of data collection. Forty youth involved in cybercrime were selected from 3 different cybercrime groups and interviewed from four localities with a preponderance of cybercrime in Lagos State that was purposively selected: Surulere, Ikotun, Badagry and Bariga. Eight Key-Informant Interviews (KIIs) were conducted with officials of the EFCC and Nigeria Police Force who were directly involved in investigation and prosecution of cybercrime and four case studies were conducted with “successful” youth involved in cybercrime. The selected youth involved in cybercrime were interacted with for over 5 years. Data were also collected from secondary sources such as EFCC and police records and periodicals. The data collected were content analysed. There is a self-sustaining structure within the ingroup of youth involved in cybercrime that allows for the long-term existence of the group and interdependence of group members and there is an existing facilitating structure that creates the enabling environment for cybercrime to thrive in the Lagos metropolis. Most cybercrimes in Lagos State are self-generating and are more of hybrid crimes that ordinarily can thrive on a low scale in the absence of the Internet. Therefore, cybercrime laws should target facilitating structures in Lagos to have a lasting effect on the control of cybercrime and the Nigerian Cybercrime Law should be revised and updated at regular intervals.

선택적 이산화탄소 포집을 위한 KOH 첨착활성탄 제조연구

홍현의,Adedeji Adebukola Adelodun,조영민 한국냄새환경학회 2013 실내환경 및 냄새 학회지 Vol.12 No.4

본 연구의 목적은 활성탄의 CO2 흡착능을 향상시키기 위하여 화학적 전처리 방법을 개발하는 것이다. 다양한 방법과 이론이 존재하지만 이번 연구에서는 아미노화와 분해를 비교하여 흡착능을 비교하기로 하였다. 본 연구에서는 4가지 유형의 활성탄 입자를 원료 물질과 크기에 따라 준비하였고, 수산화칼륨으로 전처리하여 열처리 및 아민화과정을 거 친 후, CO2 흡착능을 비교 평가하였다. 실험결과, 단순 열처리과정만 적용할 때는 600℃ 가 가장 우수하였고, 800℃에서 아민화시킨 시료가 1.4 mmol/g의 가장 좋은 흡착능을 보 였다. 400~600℃에서 아민화를 시킨 시료는 처리온도와 비례하는 선택도를 보여주었다. 분해시간 또한 흡착능과 정비례하는 관계가 나타났다. This study attempted to gain improvement of CO2 adsorption capability of activated carbon (AC). Four types of AC pellets based on carbon type and size were prepared with calcination and amination after KOH pretreatment, and examined in CO2 adsorption amount. Experimental results showed that calcination at 600℃ and amination at 800℃ of KOH-doped AC were the most suitable treatment temperature to achieve the enhanced adsorption capacity, 1.4 mmol/g. With amination between 400 and 600℃, the adsorption selectivity for CO2 increased with increasing temperature. It also was observed that the heat-treatment time would be directly proportional to the adsorption efficiency.

Amine-stabilization of KOH on activated carbon surface in the preparation of a selective CO2 adsorbent

( Adelodun Adedeji Adebukola ),조영민 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.0

Phylogenetics, Safety and In Vitro Functional Properties of Bacillus Species Isolated from Iru, a Nigerian Fermented Condiment

Gbenga Adedeji Adewumi,Sunita Grover,Chukwuemeka Isanbor,Folarin Anthony Oguntoyinbo 한국미생물·생명공학회 2019 한국미생물·생명공학회지 Vol.47 No.4

Bacillus species were isolated from iru, a traditional fermented condiment in Nigeria. Polyphasic approach was used to evaluate the phylogenetic relationship and strain sub-type of the isolated species. Additionally, the phylogenetic profiles of the species isolated from iru were compared with those of bacilli isolated from different continents. The phylogenetic diversity analysis was performed using the combination of 16S rRNA gene sequencing, ITS-PCR, ITS-PCR-RFLP, and M13 RAPD-PCR. The analysis revealed that Bacillus subtilis U170B and B. subtilis U146A isolated from iru were the closest relatives of strains belonging to the phylogeny of B. subtilis sensu stricto and were related to other bacilli isolated from different continents that had functional benefits. The two isolated species exhibited resistance to acidic pH (pH 2.0). The survival rates of B. subtilis U170B, B. subtilis U146A, and B. clausii UBBC-07 (commercial probiotic strain) cultured at pH 2.0 for 3 h were 33.45, 12.44, and 9.53%, respectively. The strains were highly tolerant to bile salts [0.3% (w/v)]. B. subtilis U170B exhibited the highest cell viability (43.45%) when cultured for 3 h in the presence of bile salts, followed by B. subtilis U146A (25%) and B. clausii UBBC-07 (18.94%). B. subtilis U170B and B. subtilis U146A did not exhibit haemolytic activity and were susceptible to different antibiotics. Additionally, these two strains exhibited weak antagonistic activity against B. cereus. The diverse wild strains of B. subtilis can be used as a safe multifunctional starter culture for the industrial production of condiments with health benefits.

DNA-free Genome Editing of the Ethylene Biosynthesis Gene in Carnation Protoplasts using CRISPR-Cas9 Ribonucleoprotein Complexes

Suleimon Oluwaseun Adedeji,Chang Kil Kim 한국원예학회 2023 한국원예학회 학술발표요지 Vol.2023 No.5