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Received May 29, 2017
Accepted July 28, 2017
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Polysulfone에 Di-(2-ethylhexyl)-phosphoric acid와 Carbon Nanotubes를 고정화한 PSf/D2EHPA/CNTs 비드의 제조와 Sr(II)의 제거 특성
Preparation of PSf/D2EHPA/CNTs Beads Immobilized with Carbon Nanotubes and Di-(2-ethylhexyl)-phosphoric acid on Polysulfone and Removal Characteristics of Sr(II)
부경대학교 화학공학과, 48547 부산광역시 남구 신선로 365 1대구대학교 생명공학과, 38453 경상북도 경산시 진량읍 대구대로 201 2울산과학대학교 환경화학공업과, 44610 울산광역시 남구 대학로 57
Department of Chemical Engineering, Pukyoung National University, 365, Sinseon-ro, Nam-gu, Busan, 48547, Korea 1Department of Biotechnology, Daegu University, 201, Daegu-daero, Jinryang-eup, Kyungsan, Gyeongbuk, 38453, Korea 2Department of Environmental & Chemical Industry, Ulsan College, 57, Daehak-ro, Nam-gu, Ulsan, 44610, Korea
josuh@uc.ac.kr
Korean Chemical Engineering Research, December 2017, 55(6), 854-860(7), 10.9713/kcer.2017.55.6.854 Epub 5 December 2017
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Abstract
본 연구에서는 di-(2-ethylhexyl)-phosphoric acid (D2EHPA)와 carbon nanotubes (CNTs)를 polysulfone (PSf)에 고정화시켜 PSf/D2EHPA/CNTs 비드를 제조하였으며, 제조한 비드에 의한 Sr(II)의 제거특성을 살펴보았다. Scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FTIR) 및 Thermo gravimetric analysis (TGA) 분석을 통하여 PSf/D2EHPA/CNTs 비드의 형태적 특성들을 조사하였다. PSf/D2EHPA/CNTs 비드에 의한 Sr(II)의 제거는 운전시간 60 min 정도에서 평형에 도달하였으며, 속도 실험결과는 유사 2차 속도식에 잘 부합하는 것으로 나타났다. 또한 PSf/D2EHPA/CNTs 비드에 의한 Sr(II)의 제거에서 Langmuir 식으로부터 구한 최대 제거량은 4.75 mg/g이었다. PSf/D2EHPA/CNTs 비드에 의한 Sr(II)의 제거효율은 추출제 D2EHPA 만을 사용하는 경우보다 CNTs를 첨가함으로써 Sr(II)의 제거량이 2.5배 정도 향상되는 결과를 보였다.
PSf/D2EHPA/CNTs beads were prepared by immobilizing extractant di-(2-ethylhexyl)- phosphoric acid (D2EHPA) and adsorbent carbon nanotubes (CNTs) on polysulfone (PSf), and the adsorption characteristics of Sr(II) on the beads were studied. The morphological characteristics of the prepared PSf/D2EHPA/CNTs beads were observed by scanning electron microscopy (SEM), thermo gravimetric analysis (TGA), and Fourier transform infrared spectrometer (FTIR). The equilibrium time for the removal of Sr(II) by PSf/D2EHPA/CNTs beads was 60 min. The experimental kinetic data followed pseudo-second-order model more than pseudo-first-order kinetics model. The maximum removal capacity of Sr(II) obtained from Langmuir isotherm was 4.75 mg/g. The removal efficiencies of Sr (II) by PSf/D2EHPA/ CNTs beads were improved 2.5 times by adding the adsorbent CNTs more than by using only the extractant D2EHPA.
Keywords
References
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