Abstract
Recently, a recycling-oriented society has been required to solve environmental issues. In the concrete field, the use of industrial wastes for concrete materials is expected. However, these wastes may contain hazardous heavy metals. It is well known that heavy metal ions can be fixed in cement paste. However, it is also reported that lead adsorption on cement paste depends on pH value. This study aims to investigate lead adsorption on cement paste at various pH values controlled by different methods. The adsorption test was carried out at various pH values controlled by three methods, including carbonation of cement paste, calcium hydroxide leaching from cement paste, and cement paste immersion in nitric acid solutions at different concentrations. The concentration of lead ions after the adsorption test was measured by using an atomic absorption spectrophotometer. In addition, X-ray diffraction test was also employed to analyze chemical changes due to the pH value as well as lead fixation. The result showed that similar pH dependency of lead adsorption was found in every pH controlling method. Additionally, it was shown that lead adsorption amount increased with a decrease in the pH value.
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References
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Nishiwaki, T., Yamasaki, M., Zhou, S.J., Ogawa, Y., Kawai, K. (2020). Lead Adsorption on Cement Paste at Various pH Values Controlled by Different Methods. In: Reddy, J., Wang, C., Luong, V., Le, A. (eds) ICSCEA 2019. Lecture Notes in Civil Engineering, vol 80. Springer, Singapore. https://doi.org/10.1007/978-981-15-5144-4_54
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DOI: https://doi.org/10.1007/978-981-15-5144-4_54
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