Trade Secret Protection in Usmca and its Implications for Korea
In: KIEP Research Paper, KIEP Opinions no. 163
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In: KIEP Research Paper, KIEP Opinions no. 163
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In: JCIT-D-23-01004
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In: East Asian Economic Review Vol. 26 No. 4 (December 2022) 257-277, https://dx.doi.org/10.11644/KIEP.EAER.2022.26.4.413
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In: Environmental science and pollution research: ESPR, Band 31, Heft 19, S. 28443-28453
ISSN: 1614-7499
AbstractThis study investigated the applicability of industrial waste. The high affinity of Fe-based products is widely used for industrial effluents because of their capability to oxidize contaminants. Waste foundry dust (WFD) is an Fe oxide that has been investigated as a potential reactive material that causes the generation of reactive oxidants. We aimed to investigate the physicochemical properties of WFD and the feasibility in the Fenton oxidation process. The WFD was used as a catalyst for removing Congo red (CR), to evaluate the generation of •OH and dissolution of Fe during the oxidation process. The linkage of •OH generation by WFD with eluted Fe(II) through the Fe dissolution was found. The Fenton oxidation reaction, CR degradation was affected by H2O2 concentration, initial pH, WFD dosage, initial CR concentration, and coexisting anions. The CR degradation efficiency increased with an increase in H2O2 concentration and WFD dosage. In addition, chloride and sulfate in solution promoted CR degradation, whereas carbonate had a negative effect on the Fenton oxidation process. The elution of Fe promotes CR degradation, over three reuse cycles, the degradation performance of the CR decreased from 100 to 81.1%. For the Fenton oxidation process, •OH generation is linked to Fe redox cycling, the surface passivation and Fe complexes interrupted the release of reactive oxidants, which resulted in the degradation of the CR decreased. This study proposed that WFD can serve as catalysts for the removal of CR.
In: KIEP Research Paper, Wolrd Economy Brief 21-34
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In: KIEP Research Paper, 연구보고서 20-11
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In: Child & adolescent social work journal, Band 29, Heft 3, S. 241-266
ISSN: 1573-2797
In: KIEP Research Paper, 연구보고서 21-30
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In: KIEP Research Paper, World Economy Brief 22-36
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In: KIEP No. 연구보고서 19-15-2
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Working paper
In: Child abuse & neglect: the international journal ; official journal of the International Society for the Prevention of Child Abuse and Neglect, Band 37, Heft 6, S. 361-373
ISSN: 1873-7757
In: Environmental science and pollution research: ESPR, Band 28, Heft 35, S. 48184-48193
ISSN: 1614-7499
AbstractThermal treatment of mercury (Hg)-contaminated soil was studied to investigate the desorption behavior of Hg at different temperatures. The soil samples were collected from two locations with different land uses around the mine and industrial site. The effect of soil properties such as inorganic carbonate minerals and organic matter content on Hg desorption was investigated to understand the thermal desorption process. The effect of soil composition on Hg desorption showed that behavior at 100 °C was similar, but a different behavior could be found at 300 °C. The thermal desorption efficiency at 300 °C is affected by the thermal properties of soils and the Hg desorption capacity of the soils. The Hg from both soil types was removed above 300 °C, and Hg was effectively removed from mine soil due to the partial decomposition of carbonate in the soil composition, while industrial soil showed that desorption would be restrained by Hg organic matter complexes due to organic matter content. Despite a relatively higher concentration of Hg in the mine soil, Hg removal efficiency was greater than that in the industrial soil. Sequential extraction results showed that only the Hg fractions (residual fractions, step 6) in mine soil changed, while the industrial soil was affected by changes in Hg fractions (step 3 to step 6) at 300 °C. Changes in soil pH during thermal desorption are also influenced by heating time and temperature. Therefore, the mechanisms of Hg desorption during thermal treatment were observed by soil properties. The volatilization of Hg in the soil is induced by organic carbon, while soil Hg release is controlled by organic matter complexes.
In: Journal of the Society for Social Work and Research: JSSWR, Band 3, Heft 2, S. 65-79
ISSN: 1948-822X
In: Children and youth services review: an international multidisciplinary review of the welfare of young people, Band 33, Heft 11, S. 2261-2266
ISSN: 0190-7409
In: KIEP Research Paper, 연구보고서(PA) 22-20
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