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James F. Harwood,Jodi M. Fiorenzano,Elizabeth Gerardo,Theodore Black,Dennis A. LaPointe,Jeomhee Hasty 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.4
The Asian bush mosquito, Aedes japonicus japonicus (Theobald) was not known to occur in the Hawaii archipelago until it was identified on the island of Hawaii in 2003. This mosquito species remained undetected on the neighboring islands for 8 years before it was discovered at the Honolulu International Airport on Oahu in 2012. By 2015, four Ae. j. japonicus mosquitoes were collected in the western mountains of Oahu and one was collected in the central mountains of Kauai. The collection of this invasive mosquito species across the neighboring Hawaiian Islands of Oahu and Kauai indicated the need for increased seasonal surveillance on these islands. Following nearly four years of surveillance, Ae. j. japonicus was also confirmed to occur in the eastern mountains of Oahu and in the central mountainous region of Kauai. To expand the knowledge of the spread of invasive mosquitoes species further surveillance is necessary to identify all possible areas where populations of Ae. j. japonicus and other invasive mosquito species occur in Hawaiian archipelago.
장지선,Laurence M. Harwood,이대성 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.5
In this study, 5-bromo-2,9-bis(5,6-diphenyl-1,2,4-triazin-3-yl)-1,10-phenanthroline (5-bromo-Ph4-BTPhen) was synthesized and evaluated for its ability to remove major radionuclides (Cs+, Sr2+, and Co2+). The synthesized ligand removed both Sr2+ and Co2+ from 1 mg/L aqueous solutions with extraction efficiencies of up to 99% at neutral and alkaline pH. The Sr2+ and Co2+ removal efficiencies decreased as a consequence of the higher bonding strengths of competing metal ions to the N-donor atoms in the cavity of the ligand; competing divalent ions affected the Sr2+ and Co2+ removal efficiencies more than monovalent ions.
Cobalt and nickel uptake by silica-based extractants
Pepper, Sarah E.,Whittle, Karl R.,Harwood, Laurence M.,Cowell, Joseph,Lee, Taek Seung,Ogden, Mark D. M. Dekker 2018 Separation science and technology Vol.53 No.10
<P>The pK(a)s of ethyl/butyl phosphonate silica (EBP-Si) have been determined, and the removal of cobalt and nickel from solution was investigated as a function of various parameters and compared with those of Purolite S950. pH uptake experiments suggested a combination of ion exchange and acid dissociation of the surface occurring. Isotherm data, fitted using the Langmuir and Dubinin-Radushkevich (D-R) models, indicated that stronger complexes formed with S950 than with EBP-Si. Kinetic data, fitted using a pseudo-second-order model, suggested that the rate-determining process is the reaction of metal ions with the chelating functionality of the resin. Uptake by EBP-Si is two to three times faster than that on S950.</P>
공액화 고분자-그래핀 옥사이드 복합체의 턴-온 형광 변화를 이용한 세슘 이온 감지
장근석(Geunseok Jang),조은비(Eunbee Cho),Laurence M. Harwood,이택승(Taek Seung Lee) 한국고분자학회 2019 폴리머 Vol.43 No.2
세슘 이온의 검출과 함께 형광이 증가하는 턴-온 형광센서를 공액화 고분자(CP)와 그래핀 옥사이드(GO)로 구성된 복합체로 제조하였다. 세슘 이온과 상호작용을 위해 CP의 곁사슬에 테트라에틸렌 글라이콜(TEG)기를 도입하였다. GO는 유기분자와 소수성 상호작용하여 소수성인 CP와 쉽게 복합체를 형성하는 특성을 가지며, 복합체를 형성하면 CP에서 GO로 에너지 전달이 일어나 CP의 형광이 사라지게 된다. CP-GO 복합체가 세슘 이온에 노출되면 CP의 곁사슬인 테트라에틸렌 글라이콜과 세슘 이온이 결합하고, 이로 인해 CP와 GO의 상호작용이 약회되어 CP가 GO로부터 유리되며, 이탈된 CP는 원래의 형광을 회복하게 된다. 이는 세슘 이온을 선택적으로 감지하는 형광 턴-온 센서로 사용가능하게 된다. New type of “turn-on” fluorescent sensor for Cs ion was developed using a composite of blue-emissive conjugated polymer (CP) and graphene oxide (GO). Ethylene glycol units were introduced to the side chain of CP, which could interact with Cs ions. The CP and GO formed a stable, nonfluorescent composite, because of hydrophobic and π-π interactions between them. In the presence of Cs ions, the CP was released from the CP-GO composite because of higher affinity of Cs ions with ethylene glycol units in the CP. Such a weaker interaction between CP and GO led to the recovery of initial blue fluorescence of the CP. The degree of fluorescence restoration would be a measure of the concentration of Cs ions. Thus, fluorescence “turn-on” from CP-GO was attributed to the presence of Cs ions.
J.T.M. Amphlett,S.E. Pepper,A.L. Riley,L.M. Harwood,J. Cowell,K.R. Whittle,T.S. Lee,M.D. Ogden 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Decommissioning is one of the most important phases in the life of a nuclear reactor, having a majorinfluence on public perception of such technology. Therefore, development of technologies that makedecommissioning more safe, effective and efficient is integral to the success of the nuclear industry. Inthis paper, phosphonic acid functionalised silica has been studied to determine its suitability for treatingnuclear decommissioning effluents produced in the HYBRID process, developed in South Korea. Cu2+recovery from HCl media in both static and dynamic modes was investigated, as well as the effect of Cu2+on Co2+ and Ni2+ recovery in a column loading system. Isothermal loading studies predicted a maximumloading capacity for Cu2+ of 22.82 mg g 1, however complex loading behaviour was observed. Cu2+sorption followed pseudo-second order kinetics with rapid uptake. Thermodynamic parameters havebeen extracted from collected kinetic data. Cu2+ outcompetes both Co2+ and Ni2+ for binding to the silicain column studies, which has implications for the use of phosphonic acid functionalised silica in treatingdecommissioning effluents. This work presents initial lab scale experiments, but shows the potential of Sibased extractants for use in metals recovery in the nuclear industry.
Synthesis of Prussian blue-embedded porous polymer for detection and removal of Cs ions
Namgung, Ho,Gwon, Young Jin,Kim, Jongho,Jang, Geunseok,Pepper, Sarah E.,Ogden, Mark D.,Whittle, Karl R.,Harwood, Laurence M.,Lee, Taek Seung Elsevier 2018 Polymer Vol.158 No.-
<P><B>Abstract</B></P> <P>A Prussian blue (PB)-embedded coordination polymer (COP) was prepared by simple incorporation of PB into a COP composed of 1,1,2,2-tetrakis(4-carboxyphenyl)ethane and the Zn ion during the synthesis of COP. The PB-COP was prepared as micro-sized particles with green emission (490 nm) from the strongly fluorescent tetraphenylethene group in the solid state through aggregation-induced emission. The PB-COP showed particle shape with sizes ranging from 1 to 6 μm. As the PB in PB-COP efficiently adsorbed Cs ions, the microstructure of PB-COP was degraded to smaller particles, along with a concomitant decrease in the green fluorescence of the PB-COP. Such a decrease in the green emission of PB-COP was used as a signal for the presence of Cs ions, in which the limit of detection for Cs ions was found to be 73.8 ppb. The hybridized material of the PB-COP can be used as both an efficient adsorbent and a sensor for Cs ions, achieving simultaneous removal and detection.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A hybrid material was prepared with coordination polymer (COP) and Prussian blue (PB). </LI> <LI> COP was prepared by ionic interaction between COOH of organic molecules and Zn ions. </LI> <LI> The hybrid materials could remove efficiently Cs ions via adsorption on PB. </LI> <LI> The fluorescence of COP in hybrid materials also decreased upon exposure to Cs ions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>