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| Synthesis of coal-based NaA molecular sieve material and Cd2+ adsorption |
| Received:September 30, 2022 |
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| KeyWord:coal gangue;molecular sieve;Cd2+;adsorption;solid waste recycling |
| Author Name | Affiliation | E-mail | | LIU Tian | Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | | | GUO Junkang | Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | junkangguo@sust.edu.cn | | ZHANG Lei | Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | | | WANG Zihao | Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | | | YU Xianwei | Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | | | WANG Jiayuan | Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | | | BI Jiangtao | School of Ecological Environment, Ningxia University, Yinchuan 750021, China | |
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| Abstract: |
| To realize waste resource utilization, coal gangue has been applied as a raw material to produce molecular sieve environmental remediation materials. NaA-500 and NaA-750 have been successfully synthesized by adjusting the silica-alumina ratio of coal gangue through calcination-hydrothermal crystallization approach at two temperature of 500℃ and 750℃, respectively. The structural characteristics and apparent morphology of the molecular sieves were further investigated using X-ray diffraction(XRD) and scanning electron microscope(SEM) characterization techniques. The adsorption kinetics and isotherm models were employed to evaluate the Cd2+ adsorption behavior on the synthesized materials. The maximum adsorption capacity of both coal-based molecular sieve materials towards Cd2+ increased significantly, compared with that of coal gangue. The maximum Cd2+ adsorption capacity of NaA-750 was 392.9 mg·g-1, and that of NaA-500 was 208.9 mg·g-1, which were 4.5 times and 2.4 times that of coal gangue. The NaA-500 and NaA-750 experimental results showed that the pseudo-second-order models and Langmuir isotherm model were more suitable for fitting the experimental data, respectively. In conclusion, the adsorption performance of NaA molecular sieve which prepared from coal gangue to Cd2+ is significantly improved and with high adsorption capacity, indicating that NaA molecular sieve has potential application value for the removal of Cd2+ from wastewater. |
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