Facile microwave-assisted synthesis of SnS2 nanoparticles for visible-light responsive photocatalyst

박성묵,박지홍,Rengaraj Selvaraj,김영훈 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-

A facile and rapid microwave-assisted method was proposed to prepare tin disulfides (SnS2) for use asvisible-light responsive photocatalysts with narrow band gap ( 2.1 eV). The photocatalytic activity ofSnS2 was evaluated by photodegradation of methylene orange (MO) under visible light irradiation(455 nm of LED lamp). SnS2-M show enhanced photocatalytic activities compared to SnS2-A andconventional TiO2, and the mineralization ratio of MO by SnS2-M showed highest value (0.025) ascompared to literature data. To confirm the photoreduction mechanism, Au or Ag dots as inhibitor fordirect reduction of MO were decorated on the SnS2 surface.

Feasibility study on the extraction of TiO2 nanoparticle exposed in the activated sludge using alkaline digestion

박성묵,김영훈 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.41 No.-

With increasing of potential toxicity of engineered nanoparticles (NPs), many in-vivo and in-vitro studieshave been conducted and required an effective extraction method of NPs from exposed biologicalsamples (tissues or cells). Herein, alkaline digestion using tetramethylammonium hydroxide (TMAH)was applied to extract TiO2 NPs exposed to activated sludge. While TMAH was shown to have highextraction efficiency of Ag NPs, Au NPs, and quantum dots, the recovery of TiO2 NPs from biologicalsamples has not been tested. Therefore, we confirm that TiO2 NPs exposed to activated sludge can beeffectively extracted at the initial size distribution using TMAH digestion with sonication.

내포 동학혁명 지도자의 활약상과 역사 문화적 의의

박성묵 동학학회 2013 동학학보 Vol.0 No.29

At the end of the nineteenth century, this period, Joseon Dynasty was a serious time of crisis when the ruling order of the Joseon Dynasty collapsed and the lives of its people were threatened seriously by the tyranny of the corrupt and incompetent Joseon Dynasty. On the other hand, externally, the imperialistic aggressive policies of the Western powers was driving the Joseon Dynasty into urgent crisis for themselves. In these crises, in Naepo region under the spread of Donghak religion, Donghak Peasant Revolution for 'a new world' into which the peasantry wanted to change the old feudal dynasty was expanding since the Gobu peasant revolt had taken place in January 1894. After showing a movement calling for the exoneration of its founder of the false charges laid against him and for which he had been put to death through early Gongju convention of 1892 to Gwanghwamun complex petition of 1893 and Boeun convention, the power of the Donghak organization in Naepo region began to overcome a time of underground and exert great influences within Bukjeob. At midnight on the last day of September, the Revolution began in each Naepo region by a decree of uprising from Bak Inho in Naepo region belonging to the church of Bukjeop Choe Sihyeong. After the spread of Donghak in Naepo region, as it was extending its territory, its organzation in Naepo region formed a relatively unique group called 'Yepo' and 'Deokpo' whose activities were centered on the area Yesan and whose central figures were Bak Inho and Bak heuiin. With the start of the Revolution, the principal leaders of Naepo Donghak instituted 'Yepo Daedoso' where they conducted a total movement, strengthened the armed by occupying the arsenal of every county office in Naepo region, and prepared against all-out war. The activities of Confucians in Daeheung region continued to keep its strength for maintaining the established order and defending their acquired rights according to the careful planning of the Daeheung magistrate Yi Changse. Daeheung Confucian army with organized as above once quailed because Donghak peasant army occupied the Daeheung county office, but as soon as Donghak peasant army was defeated since the government army of Hongju county attacked Yepo Daedoso, the Confucial army started to actively attack the peasant army again. After organized again in Yeomi field, Donghak peasant army gained a victory on victory over Myeoncheon Seungjeon-mok battle, bloodless entrance in Myeoncheon fortress, Gwanjakri battle, etc. As a result, most of the county offices in Naepo region were occupied by the peasant army, and the morale of the peasant army was high up as if it seemed to pierce the sky. However, while the peasant army failed to attack Hongju fortress instead of a plan to sally northward for Hanyang, the activities of the Dong hak peasant army in Naepo region were decaying rapidly because of Japanese army's chasing, Confucian and Anti-revolution army's apprehension and oppression about the peasant army. Eventually, The leaders of Donghak peasant army, with their dreaming of resurgence, lived a seclusive life deep in Gaya mountain and Charyeong range. After this, while playing advance combat troops, Donghak peasant army also took part in activities of army raised in the cause of justice in Byeongoh year. The leaders leading up to Donghak Peasant Revolution struggled to rebuild Donghak and gave a power of national independence movement. As a result, these activities were motivated to produce a lot of patriots and were believed to have a true meaning of the Revolution spirit in Naepo region. 19세기 말은 조선은 부패무능한 조선왕조의 폭정으로 통치질서가 무너지고 민중의 삶을 뿌리째 흔드는 심각한 위기의 시대였다. 대외적으로 서세동점의 거센 제국주의 침략노정은 조선의 풍전등화 그 자체였다. 이런 위기속에서 동학이 전래된 내포지역은 1894년 1월 고부봉기를 시작으로 낡은 봉건왕조을 바꿔 민중이 염원하는 ‘새로운 세상’을 향한 동학농민혁명으로 확산되었다. 일찍이 1892년 공주취회를 거쳐 1893년 광화문복합상소 등을 통해 교조신원운동과 보은취회에서 보여준 내포동학조직의 역량은 그간 조직화 되지 못한 은도시대를 극복하고 북접의 범주에서 큰 위력을 발휘하기 시작하였다. 북접 해월 최시형의 교단에 속해 9월 그믐날 밤 12시, 내포지역 박인호의 기포령에 의해 내포 각 지역에서 혁명이 시작되었다. 동학 전래 과정 이후 세력이 형성되면서 ‘예포’와 ‘덕포’라는 비교적 단일한 조직체를 형성했던 내포동학조직은 예산을 중심으로 박인호와 박희인이 중심인물이었다. 혁명의 시작에 따라 주요지도자들은 혁명을 총지휘했던 ‘예포대도소’가 설치되었고, 각 군 관아 무기고 점령을 통해 무장을 강화하며 전면전에 대비하였다. 기존 질서를 지켜 기득권을 유지하려는 대흥지역 유림들의 활약은 대흥군수 이창세의 치밀한 계획에 따라 강성을 유지했다. 이를 통해 결성된 대흥유회군은 동학농민군의 대흥관아 점령으로 한때 주춤하였으나 내포초토영인 홍주목 관군의 예포대도소 기습공격으로 동학농민군이 패퇴하자 다시 적극적인 토벌에 나섰다. 여미벌 재기포 후 면천승전목 전투, 면천성 무혈입성, 관작리 전투 등 연전연승하면서 내포지역 관아는 대부분 동학농민군에 접수되었고 사기충천을 하늘을 찌를듯했다. 하지만 북상계획을 바꿔 홍주성 공격에 실패하자 일본군의 추격과 유회군, 민보군의 색출과 탄압으로 내포동학농민군의 활약은 급속히 소멸되기 시작했다. 내포동학농민군 지도자들은 가야산, 차령산맥 깊은 산속에서 재기를 꿈꾸며 도피생활했다. 전위부대로 활동하던 동학농민군은 병오년 의병활동에 참여하기도 했다. 내포동학농민혁명을 주도했던 지도자들은 동학재건에 힘썼으며 일제강점기 민족독립운동의 동력을 제공하였으며 많은 애국인물을 배출하는 계기가 되어 진정한 내포정신의 의미를 가지고 있다고 볼수 있다.

Photodegradation of organic dyes via competitive direct reduction/indirect oxidation on InSnS2 under visible light

박성묵,김우철,김영훈 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.5

A visible-light-responsive photocatalyst, SnS2, was prepared by a rapid microwave-assisted method. This photocatalyst showed a narrow band gap (~2.0 eV) and a broad-spectrum response in the range of 400-800 nm. To enhance its photocatalytic activity, the surface of SnS2 was modified with indium-doping and loading of a noble metal. The photocatalytic activity of SnS2, InSnS2, and Pt/InSnS2 was evaluated by photodegradation of methyl orange (MO) and rhodamine B (RhB) under visible light. While direct reduction via a photoelectron was the major reaction in the degradation of MO, indirect oxidation (deethylation) via reactive oxygen species (·OH and ·O2 −) in the degradation of RhB was accompanied subsequently with direct reduction (cycloreversion). Therefore, photocatalytic efficiency and the mechanism for photodegradation of organic dyes depended on the types of organic dyes.

Enhancement of visible-light-driven photocatalytic reduction of aqueous Cr(VI) with flower-like In3+-doped SnS2

박성묵,Rengaraj Selvaraj,Mohammed A. Meetani,김영훈 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-

Microwave-assisted synthesis is a facile approach for overcoming critical disadvantages of conventionalheating process, such as high temperature/pressure and longer heating/cooling time as well as lowphotocatalytic efficiency. Herein, 3Dflower-like In3+-doped SnS2 (InSnS2) was successfully prepared by amicrowave-assisted solvothermal method. InSnS2 was applied to photocatalytic reduction of aqueous Cr(VI) under LED visible-light. The enhanced photocatalytic activity was attributed to indium doping,which can cause low recombination rate of photogenerated electron–hole pairs. Novel metal depositionon the photocatalyst surface and addition of organic acid as hole scavenger increased photocatalyticefficiency for the reduction of Cr(VI) under LED visible-light irradiation.

초친수성 유수분리필터 제조공정에 관한 전과정평가

박성묵 ( Sungmook Park ),김지은 ( Jieun Kim ),염창주 ( Changju Yeom ),이혜진 ( Heyjin Lee ),양성익 ( Sungik Yang ),엄익춘 ( Ig-chun Eom ),김필제 ( Pil-je Kim ),김영훈 ( Younghun Kim ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.6

나노기술의 급격한 발전은 다양한 산업응용분야에 기여를 하고 있다. 그러나 나노제품의 증가와 함께, 비의도적인 환경노출이 발생되고 있다. 나노제품에 의한 잠재적인 환경영향은 전과정평가(LCA)를 통해 해석할 수 있다. LCA는 제품의 생산과 폐기에 이르는 전체 공정상의 자원소모 및 배출에 관한 체계적인 해석을 할 수 있다. 본 연구에서는, 나노-TiO₂를 이용한 초친수성 유수분리필터를 제조하는 공정에 관하여 LCA를 수행하였다. 이를 위해 무료로 공개된 TOTAL^TM을 사용하였으며, 6대 환경영향인자인 자원소모, 기후변화, 오존층영향, 산성화, 부영양화, 광화학산화물생성 등의 지표를 해석하였다. 또한 나노-TiO₂를 사용하는 것이 유수분리필터 제조공정에서 벌크-TiO₂를 사용하는 것보다 긍정적으로 환경영향인자에 기여하는 것으로 파악되었다. Rapid growth in nanotechnologies promises novel benefits through the exploitation of their unique indus-trial applications. However, as the production volume of nanomaterials increases, their unintentional exposure to the environment has been occured. Potential impacts of nanoproducts on the environment can be evaluated in the life cycle assessment (LCA). LCA is the systematic analysis of the resource usages and emissions over the life time from the pri-mary resources to the moment of disposal. In this study, we performed LCA for fabrication processes of superhydro-philic oil/water separator using nano-TiO₂. TOTAL^TM freeware was used to analyze for all fabrication processes, and 6- environmental impact factors (resource depletion, climate change, ozone depletion, acidification, eutropication, and pho-tochemical oxidation) were introduced. In addition, the use of nano-TiO₂ in the fabrication of superhydrophilic oil/water separator was actively contributed to the environmental impact factors, compared to the bulk-TiO₂.

메탄올 수용매에서 18-Crown-6와 알칼리 금속이온의 착물 안정도

장승현,박성묵 대구대학교 산업기술연구소 1985 産業技術硏究 Vol.4 No.-

The stabilty constants for the 1:1 complexes of 18-crown-6 with alkali metal ion in 70 wt% CH₃OH and and 30 wt% H₂O are determined conductometrically. In the temperature range between 25℃ and 40℃ the values of the enthalpy and entropy changes can be calculated. It is found that the stability constants of 18-crown-6 with alkali metal cation complexes depended highly on the relatively ratio of cavity size in 18-crown-6 and cation size. And so the stability constants of the complexes are in the order of K^(+)>Rb^(+)>Cs^(+)>Na^(+)>Li^(+). The enthalpy changes in the order of K^(+)>Rb^(+)>Cs^(+)>Na^(+)>Li^(+) and the negative entropy changes also are obtained.

포비성 탄화층 생성에 의한 Fire Protective Coating Mechanism에 관한 연구

강승민,박성묵,강현주,송명신,박종현 한국공업화학회 2010 한국공업화학회 연구논문 초록집 Vol.2010 No.-