合成和表面增强修改从飞灰氧化气凝的
Lei Zhang1,2, Qi Wang1, Haocheng Zhao1
1School of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China.
Materials (Basel, Switzerland)
|April 13, 2024
概括
这项研究展示了使用酸浸方法从飞中制备高性能气凝. 该研究优化了有效利用工业废弃物的条件和修饰剂.
科学领域:
- 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.
- 环境科学 环境科学
背景情况:
- 煤炭燃烧的副产品 - - 飞,是废物处理的一个重大挑战.
- 气凝是一种先进的多孔材料,具有卓越的绝热性能.
- 开发具有成本效益和可持续的气凝生产方法至关重要.
研究的目的:
- 为了研究从活性飞中制备的二氧化气凝.
- 使用KH-570和MTMS等修饰剂优化脱过程和气凝性能.
- 分析影响飞灰脱的因素和由此产生的气凝的特性.
主要方法:
- 采用一种酸溶液-性浸出方法,并与环境压力干燥相结合,用于气凝合成.
- 使用C6H16O3Si (KH-570) 和CH3Si(CH3O) 3 (MTMS) 作为修饰剂来增强二氧化气凝的性能.
- 系统地评估盐酸度,固体-液体比,反应温度和时间对脱率的影响.
主要成果:
- 盐酸度被确定为影响飞灰脱的最关键因素.
- 用KH-570修饰剂制备的气凝在10:1的溶液与修饰剂比率下达到183mg/cm3的最低密度.
- 最佳合成涉及20%重量%的盐酸,1:4固体液体比,2小时的反应时间和100°C的反应温度.
结论:
- 这项研究成功地证明了飞灰在生产气凝中的高价值利用.
- 优化的工艺条件和修饰剂选择导致具有理想性质的气凝,包括低导热率 (0.0421 W·(m·K) -1 和高表面积 (487.9 m2·g-1).
- 这种方法有助于有效的工业废物回收和利用,促进循环经济.
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