• 한국결정학회지
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• 제18권1_2호
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• pp.1-6
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• 2007

유기금속 화합물 $C_{16}H_{35}B_{10}IrS_2Si$를 o-carborane으로 출발하여 $Cp^*Ir(S_2C_2B{10}H_{10})$을 합성하고, $Me_3SiCHN_2$를 가하여 합성하였다. X-선 회절법을 이용하여 $C_{16}H_{35}B_{10}IrS_2Si$ 화합물의 분자구조를 규명하였다. 이 화합물의 결정학적 자료는 monoclinic, space group $P2_1/n$, $a=10.1986(12)\;{\AA}$, $b=14.834(5)\;{\AA}$, $c=17.139\;{\AA}$, ${\beta}=92.24(2)^{\circ}$, Z=4, $V=2591.0(14)\;{\AA}^3$이다. 결정 구조는 직접법으로 해석하였으며, 완전행렬최소자승법을 정밀화 하였으며 5080개의 회절 반점에 대하여 최종 신뢰도 인자 R=0.053인 분자모형을 구하였다.

• 한국환경보건학회지
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• 제46권2호
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• pp.170-183
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• 2020

Objectives: This study was conducted to estimate a technology to reduce hydrogen sulfide (H₂S) in sewage odor using microbial deodorant. Methods: After injecting five commercially available microbial deodorants into fresh sewage, the concentration of hydrogen sulfide over time was measured using the headspace method. H₂S concentration in odor samples was measured using gas chromatograph/FPD. Calculated odor concentration and calculated odor intensity by H₂S concentration remaining after treatment with microbial deodorant were evaluated theoretically. Results: The rate of H₂S abatement by microbial deodorant differed depending on the experimental conditions and the type of deodorant, but it was found to range from 63 to 82%. Especially, two deodorants showed high H₂S reduction rates of over 80% on average. However, based on the best deodorant, the theoretically calculated odor concentration by H₂S after microbial deodorant treatment was 4,400 OU_k, and the theoretical odor intensity was also rated at 4 degrees or higher. Conclusions: In conclusion, microbial deodorant is considered to have a relatively high effect on reducing H₂S in sewage odor. However, even after treatment with microbial deodorant, calculated odor concentration and calculated odor intensity were relatively high. This is thought to be caused by other odorous substances besides H₂S.

• 한국세라믹학회지
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• 제38권4호
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• pp.319-324
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• 2001

본 연구에서는 NaOH로 첨착시킨 활성탄의 표면특성변화와 H$_2$S 흡착능을 고찰하였다. 첨착시약으로 사용된 NaOH 용액의 농도는 1~8N이며, 활성탄의 입자크기는 8$\times$30mesh가 적용되었다. 실험결과는 첨착율이 0.87~5.8% 범위 내에서 증가할수록 BET 표면적은 1050$m^2$/g에서 783$m^2$/g로 감소하며, 표면산도는 0.541meq/g-AC에서 0meq/g-AC으로 감소하고, pH는 9.56에서 10.86으로 증가하는 것으로 밝혀졌다. 또한 NaOH로 첨착시킨 활성탄의 H$_2$S 평형흡착능을 보임으로써 비첨착활성탄에 비해 2~3배 높은 수준을 나타냄을 알 수 있었다.

• Corrosion Science and Technology
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• 제15권3호
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• pp.125-128
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• 2016

The ASTM T92 steel was corroded at $600^{\circ}C$ and $800^{\circ}C$ at 1 atm of $N_2/3.1%H_2O/2.42%H_2S-mixed$ gas. The formed scales were thick and fragile. They consisted primarily of the outer FeS scale and the inner (FeS, $FeCr_2S_4$)-mixed scale containing a small amount of the $Cr_2O_3$ scale. This indicated that corrosion occurred mainly via sulfidation rather than oxidation due to the $H_2S$ gas. Since FeS was present throughout the whole scale, T92 steel was non-protective, displaying high corrosion rates.

• 한국미생물·생명공학회지
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• 제30권1호
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• pp.91-97
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• 2002

Removal of malodorous gases from swine manure by a polyurethane biofilter inoculated with heterotrophic and autotrophic bacteria was investigated. Ammonia, hydrogen sulfide and other gases could be efficiently treated at 3~3.6 second of empty bed retention time by the polyurethane biofilter. In the range of SV $200~l,200h^{-1}$ , the average removal efficiency of odor was about 89% when the odor unit of inlet gas was below 4100. Odor elimination capacity of the polyurethane biofilter was$ 1.8$\times$10^{5}$ $~5.0$\times$10^{7}$OUㆍm$^{-3}$ㆍ$h^{-1}$ that were 84~90% of the inlet load. The critical loads of $NH_3$ and $H_2$S, which mean 97% removal with respect to the inlet loads, were 31 and $27 g.m^{-3}$ ㆍ$h^{-1}$ , respectively. The maximum elimination capacities of $NH_3$ and $H_2$S were 56 and $157 gㆍm^{-3}$ ㆍh$^{-1}$ , respectively. Although the removability for$ NH_3$ and $H_2$S was not influenced by $H_2$S$NH_3$ ratio (ppmv/ppmv), the $H_2$S removability was inhibited by high $H_2$S concentration more than 80 ppmv.

• Bulletin of the Korean Chemical Society
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• 제7권5호
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• pp.385-388
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• 1986

The reaction of cupric nitrate trihydrate with S-2-pyridyl thioates in acetonitrile was studied. The major products were the corresponding carboxylic acids and $[Cu(NO_3)(C_5H_4NS)(C_5H_5NS$)] (Complex A). Sometimes $[Cu(NO_3)(C_5H_4NS)(H_2O$)] was also obtained in addition to Complex A. When Complex A was recrystallized in dimethylsulfoxide, $[Cu(NO_3)(C_5H_4NS)(C_5H_5NS)$ {$(CH_3)_2SO$}$_2]{\cdot}2H_2O$ was crystallized. The structures of these copper complexes and the role of cupric nitrate in the hydrolysis of S-2-pyridyl thioates are discussed.

• 대한화학회지
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• 제41권6호
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• pp.313-319
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• 1997

Diazidophenylmethane 유도체들(X: p-H, $p-OCH_3,\;p-F,\;p-CH_3$)을 합성하여 25$^{\circ}C$의 50:50(v/v) MeOH/$H_2O$ 혼합용매(${\mu}=0.1$ : KCl)에서의 pH 변화에 따른 가수분해 반응 속도상수를 측정하여 유도된 반응속도식과 치환기효과, 용매효과, 염효과, 열역학적 활성화 파라미터, 그리고 생성물분석의 결과로부터 낮은 $pH(0{\leq}pH<2)$에서는 $S_N2_CA$, 중간 pH(2$S_N1$, 그리고 높은 $pH(12에서는 $S_N2$ 반응메카니즘을 각각 제안하였다.

• 대한화학회지
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• 제41권9호
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• pp.465-470
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• 1997

입체특이성 반응을 나타내는 키랄성 다섯자리 리간드, 1,9-bis(S)-prolyl-1,9-dioxo-2,5,8-triaza-nonane(S,S-prochen)를 S-proline과 diethylenetriamine (dien)으로부터 합성하여 $^{13}C-NMR$스펙트럼으로 확인하고, $CoCl_2{\cdot}6H_2O$와 반응시켜 적자색의 착물인 $[Co(SS-prodien)H_2O]ClO_4$ 를 합성하였다. 원소분석, 전자흡수스펙트럼, $^{13}C-NMR$스펙트럼 자료에 따라 S,S-prodian은 5자리로 배위되면서 중심의 dien부분은 fac형태로 결합하고, 한자리 리간드인 $H_2O$는 dien에 있는 2차질소원자에 대하여 cis 위치에 존재하는 ${\alpha}{\beta}$ (ffm)-형임을 알게되었다. 또한 CD스펙트럼에 따라 킬레이트된 리가드는 입체선택적으로 배위되어 ${\Lambda}$-${\alpha}{\beta}$ (ffm)-$[Co(SS-prodien)H_2O]^+$의 절대구조를 갖는다고 생각하였다.

• East Asian mathematical journal
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• 제16권1호
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• pp.97-103
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• 2000

In this work, we consider a finite difference operator $L^2_N$ corresponding to $$Lu:=-(u_{xx}+u_{yy})\;in\;{\Omega},\;u=0\;on\;{\partial}{\Omega}$$, in $S_{h^2,1}$. We derive the relation between the absolute value of the bilinear form $l_{N^2}$(u, v) on $S_{h^2,1}{\times}S_{h^2,1}$ and Sobolev $H^1$ norms.

• Archives of Pharmacal Research
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• 제24권2호
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• pp.159-163
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• 2001

The accelerated stability of dimethoxy biphenyl monocarboxylate.HCl (DDB-S) was investigated in 6 mg/mL water solution in the pH ranging 2-10 and the temperature of $45-85^{\circ}C$. The observed rate of degradation followed first-order kinetics. The energy of activation for DDB-S degradation was calculated to be 14.1 and 16.5 $Kcal/mole$ at pH 5 and in distilled watery respectively. The degradation rate constant ($K_{25^{\circ}C}$) obtained by trending line analysis of Arrhenius plots for DDB-S was $5.3{\times}10^{-6}h^{-1}$. The times to degrade 10% ($t_{10}$) and 50% $t_{500}$) at $K_{25^{\circ}C}$ were 829 and 5,416 days, respectively. DDB-S exhibited the fastest degradation at pH 10 and the slowest rate at pH 5. In addition, at $K_{65^{\circ}C}$, degradation rate constants of DDB-S were 0.066, 0.059, 5.460, 32.171, and $1.4{\times}10^{-6}h^{-1}$ at pH 2, 5, 8, 10 and in distilled water, respectively. These observations indicated that the rate-pH profile of DDB-S showed general acid-base catalysis reaction in the range of pH 2-10.