• Environmental Engineering Research
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• 제22권3호
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• pp.312-319
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• 2017

The treatment of dyeing wastewater is not easy because dyes are mainly aromatic, heterocyclic compounds. The most effective technologies and methods to treat dyeing wastewater are costly and involve materials that are difficult to regenerate after use. Therefore, it is necessary to develop cost-effective, eco-friendly technologies to treat dyeing wastewater. The aim of this study was to investigate the removal of sulfur blue 11 (CI 53235) anionic dye using methyl esterified sericite (ME-sericite) adsorbents in an aqueous solution. The results are discussed in terms of the ME-sericite particle size, temperature, pH value and initial sorption rate according to the initial sulfur blue concentration. In addition, we analyzed the adsorption kinetics using a Pseudo-second-order model with the desorption and reusability. The methyl esterification caused a considerable increase in the specific surface area from 4.45 to $17.62m^2/g$. The ME-sericite adsorbents successfully removed > 98% of the sulfur dye in the aqueous solution. For the adsorption of 1 mg of sulfur dye, approximately 4.6 to 6.6 g/L ME-sericite were required. The desorption process was carried out by mixing a NaOH eluent to desorb 90.56% of the sulfur dye with 2 h of contact time. Thus, the ME-sericite is a promising adsorbent to treat dyeing wastewater due to its low dose requirement, high removal efficiency and inexpensive material.

• 농업과학연구
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• 제44권2호
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• pp.261-271
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• 2017

The aim of this study was to investigate the amount of glucosinolates (GSLs) in kale sprouts (Brassica oleracea L. var. acephala) ('TBC') according to different concentrations of sulfur ions in sprout's nutrient solutions (0.0, 0.5, 1.0, and 2.0 mM) and to different light sources [Fluorescent lamp, Red, Blue, and Mix (R+B) LED]. Kale sprouts were cultivated in a growth chamber for 13 days in sulfur solutions. Kale sprouts were treated with fluorescent lamp and LED light sources for 5 days, from eight days after sowing to harvest. Amount of seven types of GSLs (progoitrin, sinigrin, 4-hydroxyglucobrassicin, glucobrassicin, 4-methoxyglucobrassicin, gluconasturtiin, and neoglucobrassicin) were measured in kale sprouts after harvest. The total GSL content was influenced by different sulfur solution concentration, and it was the highest at S 0.5 mM ($172.54{\mu}mol{\cdot}g^{-1}DW$) and the lowest at S 2.0 mM ($163.09{\mu}mol{\cdot}g^{-1}DW$). The GSL content was influenced by different light source, and it was the highest with Red LED ($159.23{\mu}mol{\cdot}g^{-1}DW$) and the lowest with Blue LED ($147.57{\mu}mol{\cdot}g^{-1}DW$). As the sulfur solution concentration increased under all light source, progoitrin and sinigrin contents tended to decrease while glucobrassicin content showed an upward tendency for all of the light sources. The content of glucobrassicin was higher than that of progitrin when treated with sulfur solutions for all LED light sources. Sinigrin, which has excellent anti-cancer effects, showed the highest rate (92.2%) among all the GSLs, under all of the light sources.

• 대한전자공학회논문지SD
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• 제37권1호
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• pp.36-43
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• 2000

청색 발광 SrS:CuCl TFEL 소자의 휘도를 향상시키기 위하여 황 압력과 열처리 조건을 최적화하여 SrS:CuCl TFEL 소자를 제작하였다. 전자빔 증착 장비를 이용하여 SrS:CuCl 형광체를 6000 ~ 8000 ${\AA}$ 두께로 증착 시킨 후, 800 $^{\circ}C$에서 3분 동안 열처리하여 TFEL 소자를 제작시켰다. 형광체 결정은 열처리 온도 및 열처리 지속 시간의 증가에 따라 향상되었다. SrS:CuCl TFEL 소자는 468 nm 와 500 nm에서 발광 피크 파장을 나타내었고, CIE 색 좌표는 x = 0.21, y = 0.33로 청색 빛이 방출되었다. SrS:CuCl TFEL 소자의 휘도$(L_{40})$는 형광체 증착 중의 황 압력에 크게 의존하여 황 압력을 $8{\times}10^{-6}$ torr에서 $2{\tiems}10^{-5}$ torr로 증가시켰을 때 262 cd/$m^2$에서 728 cd/$m^2$로 증가되었다.

• 한국균학회지
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• 제19권4호
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• pp.285-291
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• 1991

여천공단(工團)으로부터 배출되는 오염물질중(汚染物質中) 이산화유황이 공단(工團) 주변(周邊)의 느타리버섯 재배에 미치는 영향(影響)을 조사(調査)한 결과(結果) 광양 승주 지역에는 느타리버섯 재배(栽培) 기간중(期間中) 100-2700 ppb 의 이산화유황이 수시로 내습하여 자실체(子實體) 생육(生育)에 심(甚)한 피해(被害)를 주었다 . 자실체(子實體)의 생육초기(生育初期)에 300 ppb 이상의 이산화유황에 노출되면 갈변고사(褐變故死)하고 성숙(成熟)한 자실체(子實體)는 버섯의 색택이 청갈색(靑褐色)으로 변색하고 심할때는 사멸(死滅)하였다 . 생육(生育)을 계속한 버섯도 식용(食用)할 수 없거나 상품(商品) 가치(價直)를 상실하였다 . 이산화유황의 피해증상(被害症狀)은 이산화유황이 검출(檢出)된 1일후(後) 부터 발생(發生)하였고 자실체(子實體)의 피해정도(被害程度)는 이산화유황의 농도(濃度)에 따라 달랐고 춘기재배(春期栽培)가 추기재배(秋期栽培)보다 높았고 이것은 이산화유황의 내습빈도와 관련이 있었다 . 느타리버섯 자실체(子實體) 및 배지중(培地中)의 S 함량은 피해지역과 비피해지역간 , 피해버섯과 정상 버섯간에 큰 차이(差異)를 보이지 않았다.

• Journal of Advanced Marine Engineering and Technology
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• 제25권6호
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• pp.1272-1280
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• 2001

SrS:Ce thin films for blue EL devices were prepared by Hot Wall Method and their crystallographic and optical characteristics were investigated by various methods. Deposition rates were increased with SrS cell temperature, but the rates were independent on substrate temperature and sulfur pressure. The optical and crystallographic characteristics were strongly affected by deposition rates. The band gap energies obtained by optical transmission spectra and Full Width at Half Maximum of (200) plane in X-ray diffraction patterns were found at 4.5-4.6eV and $0.22~0.26^{\circ}$, respectively. The photoluminescence from SrS:Ce thin tiles showed a greenish blue omission peaked at 470 and 540nm.

• 한국수산과학회지
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• 제39권6호
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• pp.441-446
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• 2006

Volatile flavor compounds in meat of the blue crab Portunus trituberculatus were compared using vacuum simultaneous steam distillation-solvent extraction (V-SDE) and solid phase microextraction (SPME)/ gas chromatography (GC)/ mass selective detection (MSD) methods. A total of 100 volatile flavor compounds were identified by both methods: 77 by V-SDE and 59 by SPME. These compounds were composed of 17 aldehydes, 12 ketones, 19 alcohols, 5 esters, 4 sulfur-containing compounds, 6 nitrogen-containing compounds, 23 aromatic compounds, 6 hydrocarbons, 2 terpenes, and 6 miscellaneous compounds. Although more compounds were detected using V-SDE than using SPME, the levels of all groups detected, except esters, were higher using SPME than using V-SDE. In addition to trimethylamine, aldehydes, and aromatic compounds, the S- and N-containing compounds with low thresholds are thought to have positive roles for flavors in the meat of the blue crab.

• 한국균학회지
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• 제11권4호
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• pp.163-167
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• 1983

$SO_2$가 느타리버섯의 자실체생장(生長)과 갓색에 미치는 영향(影響)을 구명(究明)하기 위하여 $SO_2$의 농도(濃度)를 0.625, 1.25, 2.5 및 5 ppm으로 조절(調節)하고 노출시간을 15, 30, 60, 120 및 180분(分)으로 하여 실험(實驗)한 결과(結果)는 다음과 같다. 1. 느타리버섯의 자실체(子實體)에 $SO_2$를 처리하면 갓색이 변화(變化)하였는데 낮은 처리수준(處理水準)에서는 회청색(灰靑色)을 띄었고 처리수준(處理水準)이 높아질수록 담갈색(淡褐色), 암갈색(暗褐色)으로 변색(變色)이 심하여 졌다. 2. 자실체(子實體) 변색(變色)의 한계점(限界點)은 0.625 ppm 120분(分), 1.25 ppm 30분(分), 2.5 ppm 15분(分)이었고 5 ppm에서는 10분(分) 이내(以內)에 변색(變色)하였다. 3. $SO_2$를 1.25 ppm 120분이상(分以上), 2.5 ppm 60분이상(分以上), 5 ppm 30분이상(分以上) 처리(處理)하면 자실체(子實體)의 생장(生長)이 억제(抑制)되었다. 2.5 ppm, 180분(分), 5 ppm 60분(分)에서는 자실체(子實體)가 고사(枯死)하였다. 4. $SO_2$의 처리(處理)는 담자기(擔子器)의 발육(發育)과 포자형성(胞子形成)을 심하게 억제(抑制)하였고 형성(形成)된 포자(胞子)의 $20{\sim}25%$는 기형화(畸形化)하였다. 5. $SO_2$를 처리(處理)한 자실체(子實體)에서 ethylene 발생(發生)은 검출되지 않았다.

• 한국광물학회지
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• 제22권2호
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• pp.107-114
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• 2009

본 연구는 고령토, 유황, 소다회, 규석 그리고 송진을 원료로 군청안료 제조기술 개발을 위하여 환원소성 방법 및 조건, 산화 조건 규명을 위하여 2 kg/회 규모의 회분식 실험을 수행하였다. 환원 소성 및 산화 공정에서 분말 형태로 소성할 경우 열전도율이 낮아 규모가 커짐에 따라 반응물 내 외부 온도차가 커져 소성 시간이 길어지고 반응 생성물이 불균일한 결과를 보였다. 군청의 색상은 원료 중의 성상, 소성 조건에 대단히 민감하며 동일한 원료에 대해서도 재현성이 낮았다. 환원 소성 시 승온율은 군청 생성에 매우 중요한 인자이며 분말 소성 시 소성 규모에 따라 값이 달라진다. 본 연구에서 사용한 3 ${\ell}$, 용량일 경우 승온율 $0.6^{\circ}C/min$, 반응온도 $850^{\circ}C$ 그리고 반응시간은 4시간 이상이 필요하였다. 녹색군청의 산화 공정에서 필요한 공기 양은 녹색군청 kg당 $500{\sim}550\;{\ell}$ 이고 적정한 반응온도는 $500{\sim}550^{\circ}C$에서 청색($-b^{\ast}$) 값이 가장 높았다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1994년도 추계 학술발표 강연 및 논문 개요집
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• pp.79-80
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• 1994

A systematic study on isoelectronic impurities in thin-film eletroluminescent devices (TFELD) has been made on the basis of the experimental analysis aimed at a survey for the blue-emitting materials. Codoping effects of isoelectronic impurities, such as oxygen(O), tellurium(Te), and lithium(Li), on the emissive characteristics of ZnS:Ce$^{3+}$ and ZnS:Tm$^{3+}$TFELD have been investigated by means of the X-ray diffraction studies, the Auger electron spectroscopy, the cathodoluminescent spectra, and the electroluminescent spectra. Experiment results reveal that oxygen codoping gives rise to an increase of the luminance, due to a suppression of the nonradiative energy transfer via sulfur vacancies Te codoping in ZnS:Ce$^{3+}$ TFELD result in a large change in the crystal field around Ce$^{3+}$ ions. Li codoping in ZnS:Tm$^{3+}$ TFELD causes the luminance to increase slightly, due to a lowering in the symmetry of Tm$^{3+}$ions. Likewise, the experimental results suggest strongly that an Auger-type enegy loss via lattece defects such an sulfur vacancies acts as a non-emissive in TFELD.ve in TFELD.

• Bulletin of the Korean Chemical Society
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• 제26권4호
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• pp.594-598
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• 2005

Treatment of a solution of $CuCl_2$ in dimethyl phosphate (DMP) with DMSO under nitrogen atmosphere afforded to a light blue fluorescence powder. Slow evaporation of $H_2O$-DMSO solution of this powder resulted in blue-sky crystals of a new polymeric Cu(II) complex, with a unit cell composed of $Cu_2(DMP)_4$(DMSO), (1). The crystal and molecular structure of the complex acquired crystallographically. Compound (1) crystallizes in the monoclinic space group $P2_1$/n with a = 12.8920(11) $\AA$, b = 13.1966(11) $\AA$, c = 14.7926(13) $\AA$, $\alpha$ = 90$^{\circ}$, $\beta$ = 98.943(2)$^{\circ}$, $\gamma$ = 90$^{\circ}$, V= 2486.1(4) ${\AA}^3$, and Z = 4. A square pyramidal environment for the metal center was established by coordination of oxygen atoms of four bridging DMP ligands in the basal positions and binding a tri-centered oxygen atom of DMSO in the apical disposition of Cu(II). The sixth position was also affected by a weak interaction with the sulfur atom of another DMSO. The phosphorous atom in the bridging DMP was arranged in a deformed tetrahedron with (gg) conformation for methyl esters with $C_{2v}$ symmetry.