| 摘要: |
| 为解决TiO2喷涂于水泥基材料表面时与水泥基材料表面结合不紧密等问题，通过改变尿素的掺加顺序、掺量以及反应温度，设计并合成了不同的SiO2@N-TiO2光催化样品，并且研究了其对目标污染物（氮氧化物（NOx）和罗丹明B（RhB））的降解效果.结果表明：在55 ℃掺加尿素后的SiO2@N-TiO2光催化样品对NOx的降解效率可达68%，较未掺尿素的SiO2@TiO2光催化样品提高了278%；对RhB的降解率可达38%，较SiO2@TiO2有小幅提升；SiO2@N-TiO2光催化剂喷涂到水泥基材料表面之后，对NOx的降解率降低较少，证明其与水泥基材料表面具有良好的耦合能力. |
| 关键词: 水泥 光催化 二氧化钛 二氧化硅 掺杂 |
| DOI：10.3969/j.issn.1007-9629.2024.07.012 |
| 分类号:TU52 |
| 基金项目:国家自然科学基金资助项目（U22A20126）；济南市“一事一议”顶尖人才项目；泰山学者攀登计划；博士后创新项目专项类别（SDCX-ZG-202203050） |
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| Modification of Cement Surface Layer by SiO2@N-TiO2 Photocatalyst |
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LIU Shaorui1, LIU Chunping2, WANG Dan1, CHNEG Xin1
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1.Key Laboratory of Building Materials Preparation and Testing Technology， University of Jinan， Jinan 250000， China;2.Shandong Winbond Construction Group， Jinan 250000， China
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| Abstract: |
| To solve the problem of TiO2 can not be tightly bonded with the surface of cement-based material， different photocatalytic materials（SiO2@N-TiO2） were designed and synthesized by changing the addition order and amount of urea and the reaction temperature. Their degradation effects on the target pollutants（NOx and rhodamine B） were studied. The results show that the degradation efficiency of NOx in the sample after adding urea at 55 ℃ can reach 68%， which is 278% higher than that of the unmodified sample（SiO2@TiO2）. The degradation rate of rhodamine B can reach 38%， which is a little higher than that of SiO2@TiO2. It still has good degradation efficiency for NOx after being applied to the surface of cement-based materials， which proves that the photocatalyst has good coupling ability with the cement surface. |
| Key words: cement photocatalysis titanium dioxide silicon dioxide doping |
