Removal of Cd2+ from water by fly ash-based mesoporous aluminum-incorporated tobermorite
XU Lin-hao1,2, ZHENG Bo-ying1, YANG Long-sheng1, WU Dai-she1,3, WANG Ze-hua1,2
1. School of Resources and Environment, Nanchang University, Nanchang 330031, China; 2. Key Laboratory of Poyang Lake Environment and Resources Utilization, Ministry of Education, Nanchang 330031, China; 3. School of Materials and Chemical Engineering, Pingxiang University, Pingxiang 337000, China
Abstract：Mesoporous aluminum-incorporated tobermorite (TFA) with different Al/Si molar ratios were hydrothermally synthesized from fly ash (FA). The physicochemical properties of FA and TFA were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), Field emission environment scanning electron microscope (SEM), Specific surface aperture analyzer, and Fourier transform infrared spectroscopy (FTIR). It was found that the specific surface area, pore volume and average pore size of TFA1 (Ai/Si=0.4) were 74.30m2/g, 0.4495cm3/g and 24.20nm, respectively, while those of TFA2 (Ai/Si=0.1) were 99.48m2/g, 0.5218cm3/g and 20.98nm, respectively. They were much higher than those of FA (1.77m2/g, 0.004338cm3/g and 9.79nm). The adsorption kinetics data of FA, TFA1 and TFA2 for Cd2+ were more consistent with the pseudo-second-order kinetics model. The Langmuir isotherm model provided better description of the Cd2+ adsorption isotherm, and the maximum adsorption capacity for Cd2+ on TFA1 was 205.76mg/g, which was much higher than those on FA and TFA2 (94.58mg/g and 107.30mg/g). The removal mechanism of Cd2+ on TFA were analyzed by XRD, SEM-X-ray energy dispersive spectrometer and FTIR. The results show that the mesoporous structure of TFA, a large amount of -OH, the ion exchange of Ca2+ and Cd2+, and the precipitation of CdCO3 and Cd(OH)2 played important roles in removing Cd2+. This work shows that the TFA can be used as an efficient and inexpensive adsorbent for Cd2+, which provides a potential application method for resource utilization of FA and the treatment of wastewater containing Cd2+ and other heavy metal ions.
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