KBaB5O9的两步法制备及其过程动力学研究

摘要/Abstract

摘要： 本文利用溶液法制备了K₂Ba[B₄O₅(OH)₄]₂·8H₂O,并将其进行热处理制备得到了KBaB₅O₉,利用XRD、FT-IR、TG-DTA-DTG对样品进行了表征。分析研究了由K₂Ba[B₄O₅(OH)₄]₂·8H₂O热处理制备KBaB₅O₉过程中的物相变化过程,其物相变化经历脱结晶水、脱羟基、重结晶、再分解、熔融再结晶5个阶段,其中结晶水的脱失分两步进行。运用Kissinger法、Flynn-Wall-Ozawa法、Šatava-Šesták法对K₂Ba[B₄O₅(OH)₄]₂·8H₂O结晶水第二步脱失过程的动力学参数进行了计算,可知K₂Ba[B₄O₅(OH)₄]₂·8H₂O结晶水第二步脱失过程的活化能E_s为151.94 kJ/mol,指前因子的对数值lg A_s为21.25 min^-1,机理函数G(α)=(1-2α/3)-(1-α)^2/3(其中α为转化率)。

关键词: 多金属硼酸盐, 硼酸钾钡, 湿化学法, 热分解, 动力学, 活化能

Abstract: In this paper, K₂Ba[B₄O₅(OH)₄]₂·8H₂O was prepared by solution method, and KBaB₅O₉ was prepared by heat treatment of K₂Ba[B₄O₅(OH)₄]₂·8H₂O. The samples were characterized by XRD, FT-IR, and TG-DTA-DTG. The phase change process in the preparation of KBaB₅O₉ by heat treatment of K₂Ba[B₄O₅(OH)₄]₂·8H₂O was analyzed and studied. The phase change experiences five stages: the loss of crystal water, the loss of hydroxyl, recrystallization, redecomposition, and recrystallization after melting. The loss of crystal water is divided into two steps. The kinetic parameters of the second step loss process of crystal water in K₂Ba[B₄O₅(OH)₄]₂·8H₂O were calculated by Kissinger method, Flynn-Wall-Ozawa method, and Šatava-Šesták method. The activation energy E_s of the second-step loss process of crystal water in K₂Ba[B₄O₅(OH)₄]₂·8H₂O is 151.94 kJ/mol, the logarithm of pre-exponential factor lg A_s is 21.25 min^-1, and the mechanism function is G(α)=(1-2α/3)-(1-α)^2/3 (α is conversion rate).

Key words: polymetallic borate, potassium borate barium, wet chemical method, thermal decomposition, kinetics, activation energy

中图分类号:

O611.66

全志林, 李志祥, 焦斌, 周贤委, 向德兴, 冯晓琴, 黄宏升. KBaB₅O₉的两步法制备及其过程动力学研究[J]. 硅酸盐通报, 2022, 41(8): 2954-2962.

QUAN Zhilin, LI Zhixiang, JIAO Bin, ZHOU Xianwei, XIANG Dexing, FENG Xiaoqin, HUANG Hongsheng. Preparation of KBaB₅O₉ by Two-Step Method and Its Process Kinetics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2954-2962.

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KBaB₅O₉的两步法制备及其过程动力学研究

Preparation of KBaB₅O₉ by Two-Step Method and Its Process Kinetics

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