通过种子诱导的水晶生长提升酸的去除,在连续的流化床结晶过程中提升去除
1Chemical Engineering Department, National Cheng Kung University, Tainan City, 701, Taiwan; Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, 807, Taiwan.
Chemosphere
|June 9, 2024
概括
这项研究通过通过种子诱导的结晶来促进晶体甲酸盐 (BaPBs) 的生长,通过化学氧沉 (COP) 来增强的去除. 一个流化床结晶系统实现了90%的去除,一个集成系统达到97.8%的去除.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 化学氧沉 (COP) 通过将酸转化为酸离子,有效地去除.
- 甲酸盐 (BaPBs) 是关键的沉物,其晶体形式 (C-BaPB) 对于有效的去除至关重要.
- 由于相变的扩散限制,扩大C-BaPB形成具有挑战性.
研究的目的:
- 通过种子诱导的结晶,绕过相转换,直接促进晶体甲酸盐 (C-BaPB) 的生长.
- 研究C-BaPB晶体生长的动力学和机制.
- 开发和演示一种高效的流化床结晶 (FBC) 系统,用于连续去除.
主要方法:
- 检查了晶体生长速度和超和,以确定限制速度的步骤.
- 准备的颗粒C-BaPB种子用于流化床结晶 (FBC).
- 研究了表面负荷,离子强度和剂量对FBC性能的影响.
- 演示了一种用于顺序结晶的系列FBC系统.
主要成果:
- 确定了表面螺旋生长作为pHpzc附近微米大小的种子的速度限制步骤.
- 在稳定状态下,在单个FBC系统中实现了90%的去除.
- 在FBC系统中观察到速度限制步骤向扩散的转移.
- 一个集成的两级FBC系统从合成废水中去除了97.8%的,并将92.3%的结晶到BaPB种子上.
结论:
- 种子诱导的结晶有效地促进了C-BaPB的生长,克服了扩散限制.
- 液化床结晶是一种可行的方法,可以连续有效地去除.
- 开发的集成FBC系统在废水中清除方面表现出高性能.
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