120th General Meeting of the KCS

Type Poster Presentation
Area Environmental Energy
Room No. Exhibition Hall 2+3
Time 10월 19일 (목요일) 11:00~12:30
Code ENVR.P-513
Subject Characterization of carbon based nanoparticle dispersion in aqueous media: Effects of ionic strength, ionic valence, and humic acid
Authors Gukhwa Hwang, Jinseon Son, Allan Gomez, Sowon Choi, Yosep Han, Hyunjung Kim*
Department of Mineral Resources and Energy Engineering, Chonbuk National University, Korea
Abstract Abstract: In this study, the stability of carbon black nanoparticles (CB-NPs) was investigated to verify the environmental influences. The stability tests were conducted in the conditions of the solution chemistry (0.1–10 mM NaCl and 0.01–1 mM CaCl2) and humic acid (0, 1 and 5 mg L-1) in an aquatic environment. The CB-NPs suspension was observed that it is easily aggregated in NaCl solution. Especially, the rate of aggregation was increased with increasing the ionic strength. On the other hand, in the conditions of CaCl2, CB-NPs stability was quite maintained regardless of ionic strength. This result was represented by specific adsorption of the divalent ions since the CB-NPs’ zeta potential showed the trends to reverse from negative charge to positive in the range of selected ionic strength. It was observed that humic acid greatly influences the stability of the CB-NPs. In particular, the stability of CB-NPs was improved in the whole range of ionic strengths of NaCl as well as of CaCl2. To confirm the results of stability test in aqueous system, the interaction energy between CB-NPs was estimated under all conditions by applying the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. Furthermore, stability of CB-NPs is ascribed to the steric repulsive force confirmed by applying the extended DLVO theory in the presence of humic acid. Acknowledgement: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2015R1D1A3A01020766), the Ministry of Education (MOE) and National Research Foundation of Korea (NRF) through the Human Resource Training Project for Regional Innovation (2015H1C1A1035930) and Korea Energy and Mineral Resources Engineering Program (KEMREP).
E-mail ghhwang0920@jbnu.ac.kr