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Analysis of microplastics in freshwater using thermal degradation method
Hye-Weon Yu(유혜원),Yun S. Kim(김윤석),SunHong Lee(이선홍),JiSu Yoo(유지수),Jaewon Choi(최재원) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Due to the high production and consumption of plastic worldwide, it has been drawn great attention on microplastics(MPs) entered the environment, especially the aquatic environment. The research scope of MPs in aqueous environment has been expanding from investigation of their presence in oceanic water to the analysis of their source, occurrence or fate in freshwater, as well as potential environmental or health risks. In recent years, questions concerning very small plastic particles, nanoplastics(NPs, 1~1000 nm), have emerged. Since the current spectroscopic analytical methods developed for microplastics have a particle size limitation and cannot reach the submicrometer range, mass spectrometry combined with thermal degradation appears to be a promising technique to meet these challenges. Thermal degradation allows the conversion of macromolecules into low molecular weight fragments, which are then separated by gas chromatography and identified by a mass detector(GC-MS). Due to the limited sample weight and the maximum operating temperature of the thin capillary of Pyrolysis-GC/MS, in this study we present an automated thermal extraction desorption(TED)-GC/MS with a separation of the thermal extraction process which is suited for the analysis of MPs and NPs in a freshwater samples.
담수 물환경 중 미세플라스틱 분석방법 및 검출에 대한 고찰
유혜원 ( Hye-weon Yu ),김윤석 ( Yun S. Kim ),이선홍 ( Sunhong Lee ),유지수 ( Jisu Yoo ),최재원 ( Jaewon Choi ) 한국환경분석학회 2020 환경분석과 독성보건 Vol.23 No.4
Theresearchscopeofmicroplasticsinaqueousenvironmenthasbeenexpandingfrominvestigationoftheirpresenceinoceanicwatertotheanalysisoftheirdistributionandbehaviorinfreshwater.However,researchinaqueousenvironmentislimitedbecausethelackofstandardizedevaluationtechniqueshasresultedintheuseofvariousunrelatedanalysismethods,thusmakingitdifficulttocomparedataonmicroplasticcontaminationanddistribution.Giventheirknownoceanicdistribution,asurveyontheoccurrenceofmicroplasticcontaminationandbehaviorinthefreshwaterenvironmentneedstobeconductedusingapreciseandaccuratestandardanalyticalmethod.Suchamethodwouldfacilitateasystematicanduniformapproachtodomesticandinternationalsafetymanagementandtothedevelopmentofimprovementplansneededtomitigatemicroplasticcontamination.Inthisstudy,wehavesummarizedthetechnologiesrecentlyappliedformicroplasticanalysisandfortheinvestigationofmicroplasticoccurrenceinthefreshwaterenvironment.Wehavealsopresentedareviewontheanalysisandevaluationofmicroplasticcontaminationinthefuture.
수소 생산을 위한 가시광선 감응 질소 도핑 TiO₂와 Nb₂O<sub>5</sub> 광촉매의 개발
최미진(Mi Jin Choi),채규정(Kyu Jung Chae),유혜원(Hye Weon Yu),김경열(Kyoung Yeol Kim),장암(Am Jang),김인수(In S. Kim) 大韓環境工學會 2011 대한환경공학회지 Vol.33 No.12
물의 광분해에 의한 수소생산을 위하여 이산화티타늄(TiO₂)과 산화니오븀(Nb2O<sub>5</sub>)을 이용하여 가시광선 감응 광촉매 개발을 본 연구의 목적으로 하고 있다. 이를 위하여 요소를 이용한 질소 도핑한 TiO₂, Nb2O<sub>5</sub>, HNb3O8 (TiO₂-N, Nb2O<sub>5</sub>-N와 HNb3 O8-N)을 제조하였다. 그 결과 질소 도핑이 광촉매의 띠간격 에너지를 감소시킴으로써 excitation파장이 자외선 영역에서 가시광선 영역으로 이동한 것을 reflectance 관찰을 통해 알 수 있었다. 특히 TiO₂-N의 경우 띠 간격 에너지가 3.3 eV (TiO₂)에서 2.72 eV로 가장 큰 감소를 보였다. 또한, 가시광선 영역에서 로다민 B 광분해 반응을 통하여 광촉매의 활성도를 평가하였을 때, 질소도핑한 경우(Nb2O<sub>5</sub>-N와 HNb3O8-N)는 모두 80% 이상의 분해 효율을 나타내었으며 특히 TiO₂-N이 약 99.8%의 높은 분해율을 보여주었다. 그러나 질소 도핑을 하지 않은 TiO₂와 Nb2O<sub>5</sub>의 경우, 약 10% 의 로다민 B가 분해된 것으로 관찰되었다. 또한 가시광선 영역에서 각 촉매의 광전류 생성을 비교해보았을 때, HNb3O8-N (63.7 mA/cm2)이 가장 높은 전류 반응을 나타내었으며 물의 광분해에 의한 수소생산량을 비교해보면 Nb2O<sub>5</sub>-N이 19.4 μmol/h의 가장 많은 양을 생산한 것으로 나타났다. Development of visible light responsive photocatalysts is a promising research area to facilitate utilization of solar energy for hydrogen production via photocatalytic water splitting. In this study two groups of samples, nitrogen (N)-doped niobium pentoxide (Nb2O<sub>5</sub>) and titanium dioxide (TiO₂) (Nb2O<sub>5</sub>-N, HNb3O8-N, TiO₂-N) and N-undoped ones (Nb2O<sub>5</sub> and TiO₂) were tested. In order to utilize visible light, nitrogen atoms were doped in selected photocatalysts by using urea. A shift of the absorption edges of the N- doped samples in the visible light region was observed. Under visible light irradiation, N-doped samples were more prominent photocatalytic activities than the N-undoped samples. Specifically, 99.7% of rhodamine B (RhB) was degraded after 60 minutes of visible light irradiation with TiO₂-N. Since TiO₂-N shows the highest activity of RhB degradation, it was supposed to generate the highest current response. However, HNb3O8-N showed the highest current response (63.7 mA/cm2) than TiO₂-N. More interestingly, when we compare the hydrogen production, Nb2O<sub>5</sub>-N produced 19.4 μmol/h of hydrogen.
Membrane autopsy를 통한 BWRO (Brackish Water Reverse Osmosis) 막오염에 대한 연구
김성조 ( Sung Jo Kim ),김란희 ( Lan Hee Kim ),김창민 ( Chang Min Kim ),신명섭 ( Myung Seop Shin ),유혜원 ( Hye Weon Yu ),오병수 ( Byung Soo Oh ),계정일 ( Jeong Il Kye ),김민정 ( Min Joung Kim ),김인수 ( In S. Kim ) 한국물환경학회(구 한국수질보전학회) 2011 공동 추계학술발표회 Vol.2011 No.-