Cetyltrimethylammonium chloride(CTAC)로 전처리한 활성탄에서의 Perchlorate 흡착능 향상

이희숙(Hee Suk Lee),손희종(Hee Jong Son),김상구(Sang Goo Kim),송미정(Mi Jung Song),유평종(Pyung Jong Yoo),최영익(Young Ik Choi) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.10

활성탄 재질별 신탄과 사용탄에서의 CTAC 처리유무에 따른 perchlorate 제거 특성을 조사한 결과, 활성탄 사용연수에 관계없이 석탄계 재질의 활성탄에서 perchlorate에 대해 가장 늦은 파과시점을 나타내었으며, CTAC를 처리한 경우 파과에 도달하는 BV는 31640, CTAC를 처리하지 않은 경우는 2301로 나타나 CTAC를 처리할 경우 13.7배 정도 파과시점이 연장되는 것으로 나타났다. 또한, 야자계 및 목탄계의 경우 CTAC 처리시 각각 Bed Volume(BV) 18409 및 5753에 파과에 도달하였으나 CTAC를 처리하지 않은 경우는 BV 719 및 288에 파과에 도달하여 25.6배 및 20배 정도 사용기간이 연장되었다. 3.1년 사용탄의 경우에도 CTAC를 처리한 활성탄이 처리하지 않은 활성탄에 비해 파과시점이 5∼6.5배 정도 연장되는 것으로 나타났다. 활성탄 g당 perchlorate에 대한 최대 흡착량(Adsorption capacity) (X/M) 평가에서는 CTAC를 처리한 석탄계, 야자계 및 목탄계 신탄의 최대 흡착량(X/M)이 각각 8303.7, 4478.8 및 1152.5 μg/g으로 나타나 CTAC를 처리하지 않은 석탄계, 야자계 및 목탄계 신탄의 최대 흡착량(X/M) 768.2, 299 및 99.2 μg/g에 비해 10.8배, 15배 및 11.6배 정도 최대 흡착량(X/M)이 증가하는 것으로 나타났다. CUR(Carbon usage rate)의 경우 석탄계 활성탄은 perchlorate의 제거를 위해 0.71g/일을 사용하지만 CTAC를 처리한 경우는 0.05 g/일을 사용하는 것으로 나타났으며, 야자계나 목탄계 활성탄의 경우는 2.16 g/일 및 3.45 g/일의 활성탄을 사용하여야만 제어가 가능하지만 CTAC를 처리한 경우는 야자계와 목탄계 각각 1일 0.08 g과 0.17 g을 사용하여도 제어가 가능한 것으로 나타났다. 활성탄의 흡착용량을 나타내는 k값의 경우 CTAC를 처리한 석탄계 활성탄이 1781.7로 CTAC를 처리하지 않은 활성탄의 307.2에 비해 월등히 높은 값을 나타내었으며, 야자계 및 목탄계 재질의 활성탄의 경우에도 CTAC를 처리한 경우가 각각 997.6과 461.9로 CTAC를 처리하지 않은 활성탄의 102.5와 94.2에 비해 월등히 높은 k값을 나타내어 CTAC를 처리한 활성탄에서 perchlorate에 대한 흡착용량이 월등히 향상되는 것으로 나타났다. Three different virgin and used activated carbons made of each coal(Calgon), coconut(Samchully) and wood(Picabiol) based activated carbons, and the acivated carbons with treated with cetyltrimethylammonium chloride(CTAC) were tested for an adsorption performance of perchlorate in a continuous adsorption column. Breakthrough behavior was investigated for the virgin coal-, coconut-, wood-based activated carbons and the activated carbons with pretreatment with CTAC. The breakthrough points of the virgin coal-, coconut- and wood-based activated carbons were observed as 288 bed volume(BV), 719 BV and 2301 BV respectively. And the breakthrough points of the virgin coal-, coconut- and wood-based activated carbons with treated with CTAC were 5753 BV, 18409 BV and 31640 BV respectively. By using pretreatment with CTAC for the virgin activated carbons, the breakthrough point could be extended up to 25 times approximately. The breakthrough behavior was also investigated for used activated carbons(3.1 years) with and without treated with CTAC. The reported results of breakthrough points of with treated with CTAC were 5 times higher than those of without pretreatment with CTAC. Adsorption capacity(X/M) of the virgin coal-, coconut- and wood- based activated carbons, and the activated carbons with pretreatment with CTAC was observed. The experimental results of adsorption capacity showed that coal- based activated carbon was highest(768.2 μg/g), coconut- based activated carbon was intermediate(299 μg/g) and wood- based activated carbon was lowest(99.2 μg/g). And the adsorption capacity of the virgin coal-, coconut- and wood activated carbons with pretreatment with CTAC was shown as 8303.7, 4478.8 and 1152.5 μg/g respectively. Moreover, carbon usage rates(CURs) for the actiavted carbons had been also investigated. The results of CURs for the virgin coal-, coconut- and wood- based activated carbons were shown as 0.71 g/day, 2.16 g/day and 3.45 g/day respectively, and the virgin coal-, coconut- and wood- based activated carbons with pretreatment CTAC were shown as 0.05 g/day, 0.08 g/day and 0.17 g/day respectively. The constant characteristic of the system, k values for coal-, coconut- and wood- based activated carbons were found to be 307.2, 102.5 and 94.2, respectively. And k values for coal-, coconut- and wood- based activated carbons with pretreatment CTAC were found to be 1781.7, 997.6 and 461.9 respectively. Consequently, the results presented in this paper provided a better insight into the adsorption performance of perchlorate. This observation suggested that using the virgin activated carbon made of coal was the best selection for removal of percholrate in the water treatment for an advanced treatment. And when the activated carbons were treated with CTAC, higher removal efficiency for perchlorate in the water can be obtained.

Cetyltrimethylammonium Chloride를 이용한 자성유체의 합성

양승용 ( Seung Yong Yang ),정노희 ( Noh Hee Jeong ) 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.1

In this study, magnetite were synthesized through the co-precipitation method which prepared using ferrous chloride and ferric chloride. And ammonium hydroxide solution is used as precipitator. Ferrofluid was dispersed by cetyltrimethylammonium chloride(CTAC). The dispersion stability test using CTAC was stable in ferrofluid by the test of scanning electron microscopy(SEM). Particle size of magnetite was measured by Particle size analyzer(PSA). The smallest particle size was formed at reaction temperature 50℃, stirring speed 500rpm, 0.7mole NH4OH concentration and 20 wt% CTAC and smallest particle size as 68.8nm. Particle size was increased as the temperature and CTAC concentration as increased.

Spectrophotometric Determination of Scandium(III) with Eriochrome Cyanine R in the Presence of Cetyltrimethylammonium bromide

차기원,박찬일,김종훈,Cha, Ki-Won,Park, Chan-Il,Kim, Jong-Whon 한국분석과학회 1996 분석과학 Vol.9 No.2

발색제로 eriochrome cyanine R(ECR)을 사용하여 여러 가지 계면활성제에서 스칸듐을 분광광도법으로 정량하는 방법과 그 착물의 조성을 연구하였다. Sc(III)-ECR 착물의 흡광도와 최대 흡수 파장은 cetyltrimethylammonium bromide (CTMAB)에서 크게 변하지만, sodium dodecyl sulfate(SDS)나 Triton X-100의 계면활성제에서는 변화가 없다. $1{\times}10^{-7}{\sim}3.0{\times}10^{-6}M$ Sc(III) 을 ECR 로 정량할 때는 pH 6.5 에서 $1{\times}10^{-3}M$ ECR 5ml와 $2{\times}10^{-4}M$ CTMAB 10ml가 필요했다. Sc(III)-ECR-CTMAB, 삼성분 착물의 몰흡광계수는 610nm에서 $5.6{\times}10^5mol^{-1}cm^{-1}L$이며 검출한계는 $1.0{\times}10^{-7}M$이었다. Sc(III)-ECR-CTMAB 삼성분 착물의 조성은 1:3:1 이었다. The spectrophotometric determination method of scandium with eriochrome cyanine R(ECR) and the composition ratio of the complex were investigated in the presence of surfactants. The absorbance increase and red shift of maximum adsorption wavelength of Sc(III)-ECR complex were observed in cetyltrimethylammonium bromide (CTMAB), but those changes were not observed in the sodium dodecyl sulfate(SDS) and Triton X-100. A volume of 5ml of $1{\times}10^{-3}M$ ECR and 10ml of $2{\times}10^{-4}M$ CTMAB are necessary for the determination of $1{\times}10^{-7}{\sim}3.0{\times}10^{-6}M$ Sc(III) at pH 6.5. The apparent molar absorption coefficient of the Sc(III)-ECR-CTMAB, temary complex at 610nm is $5.6{\times}10^5mol^{-1}cm^{-1}L$ and its detection limit is $1.0{\times}10^{-7}M$. The binary complex composition of Sc(III)-ECR is 1:2 and the ternary complex composition of Sc(III)-ECR-CTMAB is 1:3:1.

수용액으로부터 표면 수식된 CdSe 나노 입자의 제조 및 특성

김신호,이윤복,김용진,김양도,김인배,Kim, Shin-Ho,Lee, Yoon-Bok,Kim, Yong-Jin,Kim, Yang-Do,Kim, In-Bae 한국재료학회 2006 한국재료학회지 Vol.16 No.11

CTAB(cetyltrimethylammonium bromide)-capped CdSe nanoparticles were prepared by using a 4 : 1(v/v) distilled water-isopropyl alcohol mixture. The cadmium chloride and sodium selenosulfate were used as the cadmium and selenium source. By the analysis of XRD and XPS, the resultant particle was confirmed to be cubic CdSe phase. TEM image showed CdSe nanoparticles with empty core. The CTAB-capped sample showed an maximum absorption at 418nm, blue-shifting compared with bulk CdSe, which indicated stronger quantum confinement effect compared with uncapped sample. From FT-IR analysis, it was found that the presence of the new peaks in the $850{\sim}1250cm^{-1}$ range indicated the existence of chemical bonding between CTAB and surface of CdSe nanoparticles. Also TG analysis indicated that there were two weight-loss steps for the CTAB-capped CdSe nanoparticles. It was suggested that CTAB played a significant role in protecting CdSe nanoparticles.

Formation of Discrete Silica Microspheres with Cysteamine and Cetyltrimethylammonium Bromide

Park, Ji-Hun,Choi, In-Sung S. Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.7

The effect of cetyltrimethylammonium bromide on the coefficient of thermal expansion and optical transmittance of poly(ether sulfone) film

Nhat Tri Vo,김덕준 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.9

Cetyltrimethylammonium bromide (CTAB) was used as a stabilizing agent for PES films, and its effect on the coefficient of thermal expansion (CTE) and optical transmittance (OT) of PES films was investigated. The CTE of PES film decreased with increasing CTAB concentration up to 0.5 wt%, because of the improved intermolecular interaction between polymer chains via CTAB molecules. When 0.5 wt% of CTAB was added to the PES film, the CTE of polymer film decreased from 66 to 50 ppm/oC without noticeable reduction in OT. At such a low CTAB concentration range (<0.5 wt%), the glass transition temperature (Tg) and tensile strength increased with CTAB. At high CTAB concentration above 0.5 wt%, however, it had a negative effect on the properties of PES film - CTE increased but Tg and tensile strength decreased with it.

Formation of Discrete Silica Microspheres with Cysteamine and Cetyltrimethylammonium Bromide

박지훈,최인성 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.7

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견과류로부터 효율적인 DNA 추출 방법 비교

서승만(Seung-Man Suh),박샛별(Saet-Byul Park),김미주(Mi-Ju Kim),김해영(Hae-Yeong Kim) 한국식품과학회 2018 한국식품과학회지 Vol.50 No.4

본 연구에서는 견과류로부터 식품 분석에 사용될 DNA를 4가지 방법으로 추출하고 그 효율을 비교하였다. 동일한 양의 시료를 사용하여 추출된 DNA의 양은 CTAB법이 가장 우수한 것으로 확인되었지만, 추출 시간이 수배이상 오래 걸리고 유기용매를 사용한다는 한계점이 있다. 다른 방법들과 DNA 추출 양의 차이가 큰 잣, 캐슈너트, 피스타치오 너트, 땅콩의 시료는 CTAB법이 가장 효율적인 방법으로 판단되며, 호두, 헤이즐넛, 아몬드의 시료는 변형 CTAB법과 실리카 막법이 CTAB법을 대체할 수 있을 것으로 판단된다. 추출된 DNA를 식물 내재유전자 및 각 견과류에 특이적인 유전자를 사용하여 PCR을 진행하였으며, 모든 추출방법에서 DNA가 정상적으로 증폭되는 것을 확인하였다. This study aimed to explore efficient DNA extraction methods using tree nuts. Four different DNA extraction procedures, including silica membrane method, modified silica method, cetyltrimethylammonium bromide (CTAB) method, and modified CTAB method were examined for their relative efficiency in extracting DNA from pistachio, pine nut, almond, hazelnut, cashew nut, walnut, and peanut. The quality and quantity of the extracted DNA were subsequently assessed by spectrometric measurements, gel electrophoresis, and PCR amplifications. CTAB method was the most appropriate one for extracting DNA from pine nut, cashew nut, pistachio, and peanut. However, it could be replaced by the silica membrane method for walnut and modified CTAB method for almond and hazelnut.

An Expeditious Oxidative Aromatization of Hantzsch 1,4-Dihydropyridines to Pyridines Using Cetyltrimethylammonium Peroxodisulfate: A Phase Transferring Oxidant

Parvin Kumar,Ashwani Kumar 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.8

A new approach to the use of potassium peroxodisulphate as an oxidizing reagent is proposed and applied to the case of oxidative aromatization of 1, 4-dihydropyridines with cetyltrimethylammonium peroxodisulfate, a phase transfer oxidant. We demonstrate how it is possible to increase the reactivity of potassium peroxodisulphate in the presence of phase transfer catalyst. Dealkylation in case of 4-n-alkyl/n-alkenyl was not obtained.

Surface Modification of Poly(dimethylsiloxane) Microchip by Using Cetyltrimethylammonium Bromide (CTAB)

최현주,이경복,Kuk Ro Yoon,최인성,우성일,Kyungseong Choi,Sang Chun Lee 대한화학회 2004 Bulletin of the Korean Chemical Society Vol.25 No.4

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