Preparation and Property of Nano-Ag/illite Composite Material

doi:10.15541/jim20170253

Abstract

Abstract:

High-content nano-Ag/illite composite was prepared through procedure of hydrothermal modification of illite, microwave-assisted upload and ultraviolet lamp irradiation reduction of Ag. Its structure, morphology, particle size, and affinity of Ag and illite were characterized by X-ray diffraction (XRD), infrared spectra (FT-IR), scanning electron microscope (SEM), transmission electron microscope (TEM), and laser particle size distribution analyzer. The results showed that the modified illite became thicker due to the distracted layers, showing flower-like shape. In the meantime, the adsorption performance and ion-exchange capacity of modified illite obviously are enhanced. Through microwave-assisted upload and ultraviolet reduction of Ag, the uniformed Ag nano-particles were dispersed highly on the surface of illite and interacted closely to illite. Ag content in nano-Ag/illite composite is up to 27.66%. The antibacterial activities of nano-Ag/illite composites against Staphylococcus Aureus and Escherichia Coli were investigated by the inhibition zone test. The results showed that this composite material had excellent antibacterial activity against both Staphylococcus Aureus and Escherichia Coli, and the maximum antibacterial sizes were up to 5.68 mm and 6.84 mm, respectively. Furthermore, the unique lamellar structure and significant adsorption capacities of illite helped a lot to immobilize more bacteria and improved the antibacterial activity.

Key words: nano-Ag, illite, hydrothermal synthesis, modified, inhibition zone

CLC Number:

WANG Shu-Jiang, YANG Yong-Heng, WEN Chun-Yang, ZHANG Guo-Kui, YUAN Chun-Hui. Preparation and Property of Nano-Ag/illite Composite Material[J]. Journal of Inorganic Materials, 2018, 33(5): 570-576.

Figures/Tables 10

Fig. 1 XRD patterns of (I) raw illite and (N) modified illite

Fig. 2 FT-IR spectra of (I) raw illite and (N) modified illite

Fig. 3 SEM images of (I) raw illite and (N) modified illite

Fig. 4 Silver loading of nano-Ag/illite composite

Fig. 5 XRD patterns of nano-Ag/illite composite

Fig. 6 TEM images of nano-Ag/illite composite(a) Ag-I; (b) Ag-N; (c) Ag-P-N; (d) Ag-C-N

Table 1 Particle size of the composite

No.	Sample	Average particle size/nm	D₅₀/nm
1	I	1068.3	877.7
2	N	884.8	630.7
3	Ag-I	1043.6	851.1
4	Ag-N	875.7	642.7
5	Ag-P-N	873.2	649.3
6	Ag-C-N	857.8	648.3

Fig. 7 Typical photographs of nano-Ag/illite composite re-cultivated Staphylococcus aureus colonies on agar(a) I; (b) Ag-I; (c) Ag-N; (d) Ag-P-N; (e) Ag-C-N; (f) AgNO3

Fig. 8 Typical photographs of nano-Ag/illite composite re-cultivated Escherichia coli colonies on agar(a) I; (b) Ag-I; (c) Ag-N; (d) Ag-P-N; (e) Ag-C-N; (f) AgNO3

Table 2 Result of inhibition zone test

No.	Sample	Staphylococcus aureus			Escherichia coli
No.	Sample	D₁/mm	D₂/mm	D₃/mm	D₁/mm	D₂/mm	D₃/mm
1	I	8.00	8.32	0.32	8.00	8.52	0.52
2	Ag-I	8.00	10.14	2.14	8.00	10.06	2.06
3	Ag-N	8.00	11.44	3.44	8.00	11.28	3.28
4	Ag-P-N	8.00	12.48	4.48	8.00	12.38	4.38
5	Ag-C-N	8.00	13.68	5.68	8.00	14.84	6.84
6	AgNO₃	8.00	12.80	4.80	8.00	11.48	3.48

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