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NaP1 zeolite synthesized via effective extraction of Si and Al from red mud for methylene blue adsorption
Advanced Powder Technology ( IF 4.2 ) Pub Date : 2021-09-14 , DOI: 10.1016/j.apt.2021.08.036
Yong Cheng 1 , Longjun Xu 1 , Chenglun Liu 1, 2
Affiliation  

NaP1 zeolite, using red mud (RM) as raw material, was successfully prepared via alkali fusion and hydrothermal method. NaP1 zeolite, which was a mesoporous material, had specific surface area and pore diameter of 79.3 m2·g−1 and 7.26 nm, respectively. NaP1 zeolite had excellent adsorption properties. Under the optimum adsorption conditions, methylene blue (MB) was adsorbed through NaP1 zeolite, the adsorption capacity was 48.7 mg·g−1 and the removal efficiency was 97.1%. The adsorbent was regenerated with sodium chloride as eluent. The adsorption capacity of the adsorbent regenerated three times still was satisfactory 34.53 mg·g−1, which showed the excellent stability performance from NaP1 zeolite. The adsorption conformed to the pseudo second order kinetic and Freundlich isotherm model. Moreover, MB molecules were adsorbed by diffusion on the outer surface, diffusion on the inner surface, and adsorption on the inner surface of NaP1 zeolite. And, during the external diffusion, electrostatic attraction and hydrogen bonding created. Al and Si were extracted from RM to prepare NaP1 zeolite with excellent adsorption properties. This result provides an important example for the development of the potential value of RM.



中文翻译:

从赤泥中有效提取Si和Al以吸附亚甲基蓝合成NaP1沸石

以赤泥(RM)为原料,通过碱熔法和水热法成功制备了NaP1沸石。NaP1沸石是一种介孔材料,其比表面积和孔径分别为79.3 m 2 ·g -1和7.26 nm。NaP1沸石具有优异的吸附性能。在最佳吸附条件下,亚甲蓝(MB)通过NaP1沸石吸附,吸附量为48.7 mg·g -1,去除率为97.1%。用氯化钠作为洗脱剂再生吸附剂。吸附剂再生3次后的吸附量仍令人满意,为34.53 mg·g -1,这表明 NaP1 沸石具有优异的稳定性能。吸附符合准二级动力学和 Freundlich 等温线模型。此外,MB分子通过在NaP1沸石的外表面扩散、内表面扩散和内表面吸附而被吸附。并且,在外部扩散过程中,产生了静电引力和氢键。从RM中提取Al和Si制备具有优异吸附性能的NaP1沸石。这一结果为开发RM的潜在价值提供了一个重要的例子。

更新日期:2021-10-01
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