两步法制备抗菌纳米CaCO3@TiO2@Ag复合材料的研究

doi:10.19964/j.issn.1006-4990.2025-0038

Abstract

Abstract:

To enhance the value of calcium carbonate and develop its new application market，antibacterial nano-CaCO₃@TiO₂@Ag composites were fabricated by a two-step method using butyl titanate and silver nitrate as shell materials.The effects of reaction temperature，stirring speed，Ag loading capacity，reaction time，and aging time on the silver loading effect and loading mechanism were investigated.The products were characterized by transmission electron microscopy（TEM），scanning electron microscopy（SEM），energy dispersive X-ray spectroscopy（EDS），X-ray diffraction（XRD），X-ray photoelectron spectroscopy（XPS） and Fourier transform infrared spectroscopy（FT-IR）.The results showed that the optimal loading conditions for Ag were as follows：reaction temperature of 30 ℃，stirring speed of 350 r/min，Ag loading capacity of 10%（mass fraction），reaction time of 80 min，without aging time.Under the optimized loading conditions，amorphous TiO₂ was uniformly loaded on the surface of nano-calcium carbonate by forming Ca—O—Ti chemical bonds to form CaCO₃@TiO₂.Then Ag⁺ was adsorbed and reduced under the action of organosilicon molecules to produce 5~10 nm silver particles coated on the surface of CaCO₃@TiO₂，and nano-CaCO₃@TiO₂ @Ag core-shell structure was obtained.The antibacterial tests demonstrated that the antimicrobial performance of nano-CaCO₃@TiO₂@Ag in powder coatings met the class I standard as outlined in GB/T 21866—2008 “Test method and effect for antibacterial capability of paints film”.

Key words: nano-CaCO₃@TiO₂@Ag, core-shell structure, antibacterial property

CLC Number:

TQ62

REN Guoyu, JIANG Suju, YANG Aimei, ZHU Yong, YUAN Aiqun, BAI Lijuan, NONG Huafei, WANG Xiong. Study on preparation of antibacterial nano-CaCO₃@TiO₂@Ag composites by a two-step method[J]. Inorganic Chemicals Industry, 2026, 58(2): 36-44.

Figures/Tables 14

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References 29

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抗菌剂	检测项目	判定标准	测定结果	判定
市售银系抗菌剂	抗细菌性能≥	99.00（Ⅰ级） 99.00（Ⅰ级）	大肠杆菌（AS1.90）99.98% 金黄色葡萄球菌（AS1.89）99.92%	合格
市售银系抗菌剂	抗细菌耐久性能≥	95.00（Ⅰ级） 95.00（Ⅰ级）	大肠杆菌（AS1.90）93.01% 金黄色葡萄球菌（AS1.89）89.22%	不合格
CaCO₃@TiO₂@Ag	抗细菌性能≥	99.00（Ⅰ级） 99.00（Ⅰ级）	大肠杆菌（AS1.90）99.99% 金黄色葡萄球菌（AS1.89）99.99%	合格
CaCO₃@TiO₂@Ag	抗细菌耐久性能≥	95.00（Ⅰ级） 95.00（Ⅰ级）	大肠杆菌（AS1.90）95.37% 金黄色葡萄球菌（AS1.89）95.12%	合格

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Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of antibacterial nano-CaCO₃@TiO₂@Ag composites by a two-step method

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Study on preparation of antibacterial nano-CaCO3@TiO2@Ag composites by a two-step method