无机材料学报 ›› 2019, Vol. 34 ›› Issue (6): 653-659.DOI: 10.15541/jim20180359

• 研究论文 • 上一篇    下一篇

B2O3-SiO2-Na2O缓释材料的合成工艺参数优化及其缓释机理

黄长兴,崔骏,裴元生()   

  1. 北京师范大学 环境学院, 教育部水沙科学重点实验室, 北京 100875
  • 收稿日期:2018-08-02 修回日期:2018-10-10 出版日期:2019-06-20 网络出版日期:2019-05-23
  • 作者简介:黄长兴(1994-), 男, 硕士研究生. E-mail:201621180072@mail.bnu.edu.cn
  • 基金资助:
    国家自然科学基金(51579009);北京市科技计划项目(Z181100005518005)

B2O3-SiO2-Na2O Controlled-release Material: Synthetic Parameters Optimization and Release Mechanisms Exploration

Chang-Xing HUANG,Jun CUI,Yuan-Sheng PEI()   

  1. Key Laboratory of Water and Sediment Sciences, School of Environment, Beijing Normal University, Beijing 100875, China
  • Received:2018-08-02 Revised:2018-10-10 Published:2019-06-20 Online:2019-05-23
  • Supported by:
    National Natural Science Foundation of China(51579009);Beijing Municipal Science and Technology Plan Projects(Z181100005518005)

摘要:

为优化工艺参数、减少原料损失和控制生产成本, 本研究采用单因素法研究不同升温速率、保温时间、熔制温度和起始温度对硼酸盐缓释材料(BCRM)在制备过程中B2O3挥发量和气泡生成情况的影响规律。运用X射线衍射分析、红外光谱和X射线光电子能谱仪表征缓释前后BCRM理化性质变化, 通过Korsmeyer-Peppas模型分析BCRM缓释机理。结果表明, 在起始温度1050 ℃、保温时间2 h和熔制温度1050 ℃的最优工艺参数下, B2O3挥发量可降低至1.08%, BCRM澄清透明, 无气泡生成, 缓释性能良好。此外, 温度会影响BCRM的缓释机理, 在30和35 ℃时, 释放机理为Super Case II转运; 在40 ℃时, 释放机制为non-Fickian扩散。但在不同温度下, 硼累积释放率均高于95%。

关键词: 硼酸盐, 工艺参数优化, B2O3挥发, 缓释机理

Abstract:

Aiming at optimization of synthetic process, reduction of raw materials loss and control of production cost, the single factor method was used to study the effects of different heating rate, holding time, melting temperature, and initial temperature on the B2O3 volatilization and bubble formation during the preparation of borate controlled- release material (BCRM). The physicochemical properties of BCRM before and after controlled-release were characterized by X-ray diffraction analysis, infrared spectroscopy and X-ray photoelectron spectroscopy, and the release mechanism of BCRM was analyzed by Korsmeyer-Peppas model. The results show that the amount of B2O3 volatilization can be reduced to 1.08%, no bubble forms in the transparent BCRM, and controlled-release performance is acceptable under optimum conditions of initial temperature 1050 ℃, holding time 2 h and melting temperature 1050 ℃. Controlled-release mechanism of BCRM, affected by temperature, is Super Case II transport at 30 and 35 ℃ while it is non-Fickian diffusion at 40 ℃. However, the cumulative release rate of boron is greater than 95% at different temperatures.

Key words: borate, process parameter optimization, volatilization volume, release mechanism

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