Abstract
Using coal gangue(CG)as raw material,a new type of all solid-waste-based 13-X molecular sieve material was controllably prepared by alkali fusion-hydrothermal method.The synthetic molecular sieve was used as a solid adsorbent to treat Cd2+-containing wastewater,and its adsorption behavior on Cd2+in aqueous solution was studied and analyzed.The microstructure and morphology of the molecular sieve were investigated by X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM)and specific surface area analyzer.The results show that the synthesized 13-X molecular sieve has higher Brunauer-Emmett-Teller(BET)specific sur-face area with higher crystallinity and higher adsorption capacity for the heavy metal Cd2+.The adsorption process of Cd2+by molecular sieve conforms to the Langmuir isotherm adsorption equation and Lagergren pseudo-sec-ond-order rate equation.Combined with thermodynamic calculation,it can be concluded that the adsorption process is physically monolayer,spontaneous and exothermic.In this study,a low-cost and naturally available synthesis method of 13-X molecular sieve is reported.Combined with its adsorption mechanism for Cd2+,it provides a feasible and general method for removing heavy metal ions from coal gangue and also provides a new way for the utilization of coal gangue with high added value.
基金项目
国家自然科学基金(52172099)
Basic Research Plan of Natural Science of Shaanxi Province(2020JQ-754)
Key Innovation Team of Shaanxi Province(2014KCT-04)
Excellent Youth Science and Technology Fund Project of Xi'an University of Science and Technology(6310221009)
Special Project of Shaanxi Province(19JK0490)
Study on Preparation and Properties of New Solid-Wastebased Cementitious Materials(6000190120)
NETL
NSTL
万方数据