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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.
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.
Loida E. Mojicaa,Jannie Gracelyn P. Avilesb,Jeanette Angeline B. Madambac,Agnes T. Banzond 아시아무역학회 2018 Journal of Asia Trade and Business Vol.4 No.2
Agribusiness has to be at par with other businesses in adapting to the globalized market environment to take advantage of the new opportunities brought about by the new market reach. With the increased internet and social media penetration in the Philippines as shown in the digital statistical indicators in 2016 and 2017, and the support of telecommunication service providers, opportunities for adoption of e-commerce are available for agribusiness companies.E-commerce becomes increasingly important to business organizations as businesses connect with the other players in the supply chain. Although e-commerce has been found to benefit businesses, and there is awareness among agribusiness MSMEs of these benefits, adoption of e-commerce agribusiness retail micro, small and medium Enterprises (MSMEs) in Laguna, Philippines is relatively slow compared to big businesses. The traditional way of doing business, specifically, the personalized interaction with the customers that the MSMEs would like to maintain, the generally small business size, the cost of investing, implementing and maintaining e-commerce infrastructure and people and the lack of knowledge of e-commerce among agribusiness retail MSMEs were the barriers to e-commerce adoption among retail MSMEs.
Future Directions of Home Economics Education: Nordic-Baltic Perspectives
Janni Haapaniemi,Päivi Palojoki,Jaana Taar 한국가정과교육학회 2022 한국가정과교육학회지 Vol.34 No.5
The research scope of home economics education (HEE) has widened considerably over the last few decades, influencing pedagogical developments in this field. We read 14 recent dissertations related to HEE in the Nordic-Baltic region and considered the questions that these studies pose for the future of HEE. We concentrated on the following three aspects: to whom this kind of education is relevant, what the content is, and how home economics (HE) can be taught. We demonstrated the need for HE to recognise societal changes and respond to them respectfully while reflecting on how and what to teach in HEE. Our reading prompted us to recommend that HEE use versatile tools and exploratory learning tasks in teaching students critical thinking and reflection skills as well as in overcoming the feeling of time poverty when teaching HE. We argued that HE teachers should use their autonomy to critically reflect on and develop HE curricula and their teaching methods and content in HEE to respond to societal changes.