The influence of acid demineralization on surface characteristics of black carbon and its sorption for pentachlorophenol |
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Authors: | Lou Liping Luo Ling Wang Lina Cheng Guanghuan Xu Xinhua Hou Jiaai Xun Bei Hu Baolan Chen Yingxu |
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Institution: | Department of Environmental Engineering, Zhejiang University, Hangzhou, People's Republic of China. |
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Abstract: | Acid treatment is a routine demineralization process to obtain black carbon (BC), but there has been little systematic research about its influence on BC's characteristics. In this study, elemental analysis, SEM, FTIR, and Boehm titration were used to investigate that effect. Our results showed that the acid treatment had little influence on the sorption of fly ash and soot to pentachlorophenol (PCP), but it greatly increased the sorption of rice chars to PCP. There were two competing effects of acid demineralization on the adsorption capacity of BC. On one hand, it increased the amount of the acidic functional groups, which decreased the adsorption capacity. On the other hand, it increased the surface and pore volume of BC and caused the emergence of hidden carbon enclosed by minerals, which in turn increased the sorptivity significantly. Especially for rice chars (600°C), after acid treatment, their surface area increased from 3.52 to 235 m(2) g(-1) and the sorption capacity coefficient increased from 2.12 to 4.10. |
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