http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Oluranti Agboola (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Oluranti Agboola,Jannie Maree,Richard Mbaya,Andrei Kolesnikov,Rotimi Sadiku,Arne Verliefde,Arnout D’Haese 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
The nanofiltration (NF) process is electrostatically governed and the surface free energy plays a key role inthe separation of particulates, macromolecules, and dissolved ionic species. Streaming potential measurement and thesurface charge mapping by Kelvin probe atomic force mircoscopy (AFM) have been carried out. Forces of interactionnear the surface of nanofiltration membranes were further studied by a force spectroscopy using atomic force microscopy. The two membranes used are more negatively charged at high pH values; hence the higher the solution chemistry,the higher and faster will be adhesion of ions on the surface of the nanofiltration membranes. It was observed thatthe three acquired signals from non-contact AFM (contact potential difference, amplitude and phase) were rigorouslyconnected to the surface structure of the nanofiltration membranes. In addition to the surface structure (roughness),electrostatic interactions can also enhance initial particle adhesion to surfaces of nanofiltration membranes. The performanceof the NF membranes was further investigated for the removal of nickel ions from aqueous solution, and theresults were correlated to the mechanical responses of the nanofiltration membranes obtained from AFM and the streamingpotential measurement.
-
Deposition of toxic metal particles on rough nanofiltration membranes
Oluranti Agboola,Jannie Maree,Richard Mbaya,Caliphs Musa Zvinowanda,Gomotsegang Fred Molelekwa,Nora Jullok,Bart Van der Bruggen,Alexander Volodine,Chris Van Haesendonck 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.8
Two nanofiltration (NF90 and Nano-Pro-3012) membranes were investigated for their capacity to removemetal ions. This study presents the effect of membrane roughness on the removal of toxic metal ions during dead endmembrane filtration. Atomic force microscopy, scanning electron microscopy, WSXM software and ImageJ were usedto characterize the roughness of the membranes. Gradual decrease in filtration permeate flux was observed as foulantsaccumulated at the interface of the membranes; filtration permeate flux varied from 20 L/m2/h to 14 L/m2/h and 11 L/m2/h to 6 L/m2/h for NF90 and Nano-Pro-3012, respectively. NF90 membrane was more prone to fouling than the Nano-Pro-3012 membrane: the percentage flux reduction was higher for NF90 (3.6%) than Nano-Pro-3012 (0.98%). Thebearing ratio of the fouled NF90 exhibited a high peak of 7.09 nm than the fouled Nano-Pro-3012 with the peak of6.8 nm.
-
The role of membrane technology in acid mine water treatment: a review
Oluranti Agboola 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.9
The activities of mining industries are attracting more scrutiny as the concern of limitations of conventional technology for wastewater treatment and the potential use of wastewater have resulted in accelerated attention in membrane technologies. The paucity of water and industrial environmental guidelines has resulted in the application of membrane technologies in wastewater treatment, especially in the mining industry. Although many conventional physical and chemical processes have been employed to treat acid mine drainage (AMD), they have, however, demonstrated low efficiency and high cost. Membrane technologies have proven to be an important part in the treatment of AMD in order to reduce water paucity. Apart from addressing water paucity, membrane technologies meet high-level application with respect to ease of use, adaptability and environmental impacts. This paper reviews the use of membrane in the published literature for the treatment of acid mine waters and, for the recovery of valuable metals from acid mine drainage effluents. The role of membrane technology in acid mine water treatment is discussed together with the factors that determine membrane performance for AMD treatment. The challenges of membrane technology in acid mine water treatment were reviewed and some solutions to the challenges are presented.
-
Augustine Omoniyi Ayeni,Oluranti Agboola,Michael Olawale Daramola,Bianca Grabner,Babalola Aisosa Oni,Damilola Elizabeth Babatunde,Joseph Evwodere 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.1
Corn cob lignocellulosic biomass is one of the useful precursors for the alternative production of fuels and chemicals. Understanding the kinetics of enzymatic conversion of corn cob through kinetic models could provide indepth knowledge and increase the predictive ability for process design and optimization. In this study, models based on the semi-mechanistic rate equations, first-order decay exponential function of time for adsorbed enzymes, structural and diffusion coefficient for adsorption were used to estimate kinetic parameters for the enzymatic conversion of alkaline peroxide oxidation (APO) pretreated corn cob to sugar. Fitting a first-order inactivation model of adsorbed cellulases to account for experimental hydrolysis data, the apparent hydrolysis rate constant (k2=29.51 min1), the inactivation rate constant (k3=0.269min1), and reactivation rate constant (k4=0.0048min1) were estimated. Regressed values of apparent maximum rate, Vmax, app, for adsorbed enzymes reduced appreciably with time to more than 98% at 96 h. The diffusion limit model showed that the diffusion resistance increased with increasing enzyme concentrations.
-
Harvesting Electricity from CO2 Emission: Opportunities, Challenges and Future Prospects
Peter Adeniyi Alaba,Shaukat Ali Mazari,Hamisu Umar Farouk,Samuel Eshorame Sanni,Oluranti Agboola,Ching Shya Lee,Faisal Abnisa,Mohamed Kheireddine Aroua,Wan Mohd Ashri Wan Daud 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.3
The ever-increasing CO2 emission has necessitated the search for suitable technologies for CO2 utilization at a low cost. Recently, a novel concept called reactive gas electrosorption (RGE) for energy harvesting from CO2 emission, which could boost the efficiency of a thermal power plant by 5% was proposed by Hamelers and coworkers. The concept involves mixing of air stream with a low CO2 concentration with a stream of high CO2 concentration in an alkaline aqueous electrolyte. However, this concept is faced with the challenges of designs specific for CO2-electrolyte, and inadequate performance of the electrode materials. Therefore, this study showcases electricity generation opportunities from CO2 via RGE and discussed challenges and prospect. The study reveals that the drawback relating to the electrode could be solved using heteroatom doped traditional carbon materials and composite carbon-based materials, which has been successfully used in capacitive cells designed for desalination. This modification helps to improve the hydrophilicity, thereby improving electrode wettability, and suppressing faradaic reaction and co-ion repulsion effect. This improvement could enhance the charge efficiency, sorption capacity durability of electrodes and reduce the energy loss in RGE. Moreover, intensification of the membrane capacitive deionization (MCDI) process to obtain variances like enhanced MCDI and Faradaic MCDI. Hybrid capacitive deionization (HCDI) is also a promising approach for improvement of the capacitive cell design in RGE. This intensification can improve the electrosorption capacity and minimize the negative effect of faradaic reaction. The use of alternative amine like Piperazine, which is less susceptible to degradation to boosting CO2 dissolution is also suggested.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
