B2O3-SiO2-Na2O缓释材料的合成工艺参数优化及其缓释机理  

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

作　　者：黄长兴 崔骏[1] 裴元生[1] HUANG Chang-Xing;CUI Jun;PEI Yuan-Sheng(Key Laboratory of Water and Sediment Sciences,School of Environment,Beijing Normal University,Beijing 100875,China)

机构地区：[1]北京师范大学环境学院教育部水沙科学重点实验室

出　　处：《无机材料学报》2019年第6期653-659,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(51579009);北京市科技计划项目(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2h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SuperCaseⅡ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%。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 controlledrelease 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.

关 键 词：硼酸盐 工艺参数优化 B2O3挥发 缓释机理 

分 类 号：TB321[一般工业技术—材料科学与工程]