成核
结晶
沸石
结晶度
活化能
化学工程
吸附
晶体生长
材料科学
Crystal(编程语言)
相(物质)
化学
结晶学
物理化学
催化作用
有机化学
程序设计语言
计算机科学
工程类
作者
Yanan Zhang,Jitong Deng,Changxiu Zhai,Yongjun Zhang,Hongjing Han,Mei Zhang,Haiying Wang,Yuxuan Tian,Yanguang Chen
摘要
Abstract The NaP zeolite with excellent crystallinity and adsorption performance was obtained by adopting the Na 2 SiO 3 and NaAlO 2 from coal fly ash as the raw materials. As the synthesis condition of aging for 0.5 h at 30°C and crystalizing for 8 h at 120°C with n (H 2 O)/ n (SiO 2 ) = 116, n (Na 2 O)/ n (SiO 2 ) = 1.4, and n (SiO 2 )/ n (Al 2 O 3 ) = 2.8, NaP zeolite owned higher crystallinity (98.98%) and spherical morphology (∼2.78 μm). During the crystallization, the nucleation/growth kinetics was calculated to survey the crystallization mechanism via the theoretical calculation and characterization methods. The diffusion of reactants in the solid–liquid‐phase interface was dominant, wherein the heterogeneous nucleation and solid‐phase transformation were also proposed based on the fitting results of Avarami–Erofeev and simple kinetic equations . The activation energy results of nucleation ( E n , 27.67 kJ/mol) and growth ( E g , 13.31 kJ/mol) demonstrated that the induced nucleation period was the critical step during the crystallization. Hence, the method of rapid nucleation was introduced and the induced nucleation time was shortened 50% (from ∼2.0 to ∼1.0 h) as the crystal seed was added. Moreover, the grain size of NaP‐Seed zeolite reduced to ∼2.02 μm. Meanwhile, the synthesized NaP zeolite adsorbent was employed for the removal of phenol compound from the aqueous solution. Under the synergistic effect of electrostatic interaction and pore filling effect, NaP zeolite exhibited better adsorption with the removal rate of 82.63% (pH = 5.0 and 40 min) and stability in the five consecutive cycles.
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