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RISS 인기검색어
- 검색키워드
- 저자 : Heqing Tang (검색결과 2 건)
- 무료
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- 유료
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Activation of persulfate by UV and Fe<sup>2+</sup> for the defluorination of perfluorooctanoic acid
Song, Zhou,Tang, Heqing,Wang, Nan,Wang, Xiaobo,Zhu, Lihua Techno-Press 2014 Advances in environmental research Vol.3 No.3
Efficient defluorination of perfluorooctanoic acid (PFOA) was achieved by integrating UV irradiation and $Fe^{2+}$ activation of persulfate ($S_2O{_8}^{2-}$). It was found that the UV-$Fe^{2+}$, $Fe^{2+}-S_2O{_8}^{2-}$, and UV-$S_2O{_8}^{2-}$ processes caused defluorination efficiency of 6.4%, 1.6% and 23.2% for PFOA at pH 5.0 within 5 h, respectively, but a combined system of UV-$Fe^{2+}-S_2O{_8}^{2-}$ dramatically promoted the defluorination efficiency up to 63.3%. The beneficial synergistic behavior between $Fe^{2+}-S_2O{_8}^{2-}$ and UV-$S_2O{_8}^{2-}$ was demonstrated to be dependent on $Fe^{2+}$ dosage, initial $S_2O{_8}^{2-}$ concentration, and solution pH. The decomposition of PFOA resulted in generation of shorter-chain perfluorinated carboxylic acids (PFCAs), formic acid and fluoride ions. The generated PFCAs intermediates could be further defluorinated by adding supplementary $Fe^{2+}$ and, $S_2O{_8}^{2-}$ and re-adjusting solution pH in later reaction stage. The much enhanced PFOA defluorination in the UV-$Fe^{2+}-S_2O{_8}^{2-}$ system was attributed to the fact that the simultaneous employment of UV light and $Fe^{2+}$ not only greatly enhanced the activation of $S_2O{_8}^{2-}$ to form strong oxidizing sulfate radicals ($SO{_4}^{\cdot-}$), but also provided an additional decarboxylation pathway caused by electron transfer from PFOA to in situ generated $Fe^{3+}$.
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Adsorption of methyl orange using self-assembled porous microspheres of poly(o-chloroaniline)
Muhammad Naveed Anjum,Heqing Tang,Mohammad Zuber,Khalid Mahmood Zia,Lihua Zhu,Haroon-ur-Rashid,Mirza Nadeem Ahmad 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.12
Self-assembled hollow microspheres poly(o-chloroaniline) (POC) have been synthesized by simple oxida-tive polymerization of o-chloroaniline using camphor-sulfonic acid (CSA) as dopant acid and ammonium persulfate(APS) as oxidant. The POC microspheres were characterized by means of FTIR, XRD and SEM analysis. Adsorptioncharacteristics of POC spheres were studied by using methyl orange (MO) as adsorbate. It was found that adsorptionof MO by POC was better described by pseudo-second-order kinetics than any other kinetic model, such as the pseudo-first-order and intra-particle diffusion models. Langmuir adsorption isotherm model was the best to fit experimentaldata. The results showed that hollow microspheres of POC can be used as novel and low-cost adsorbent for removalof organic dye from waste water.
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