Department of Environmental and Civil Engineering, Hachinohe Institute of Technology, 88-1, Myo, Hachinohe 031-8501, Japan;
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;
Department of Environmental and Civil Engineering, Hachinohe Institute of Technology, 88-1, Myo, Hachinohe 031-8501, Japan;
rice husk ash; pretreatment; specific surface area; chemical reactivity;