期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 3, 期 8, 页码 1846-1852出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b00404
关键词
Reduced graphene oxide (rGO); Quaternized chitosan (QCS); Layered silicate; Green reducing; Stabilizing; DNA Uptake; Thermal stability
资金
- National Natural Science Foundation of China [51403069]
- Program for New Century Excellent Talents in University [NCET-13-0216]
- Science & Technology Project of Guangzhou City in China [2012J2200018]
- Fundamental Research Funds for the Central Universities, SCUT [2014ZG0011]
In this study, we prepared stable reduced graphene oxide (rGO) solutions with renewable resource quaternized chitosan (QCS) and layered silicate as green reducing and stabilizing agents. Rectorite (REC) and organic rectorite (OREC) are typical layered silicate employed in this work. UVvisible absorption spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy results showed the good reducing effect of QCS to produce rGO. Transmission electron microscopy, atomic force microscope, and X-ray diffraction results showed that rGO nanosheets were loaded with layered silicate through cation exchange to get a rGO/QCS/layered silicate composite. The high zeta potential (+41.4 mV) of the rGO/QCS composite showed the good stabilizing effect of QCS, and the higher zeta potential of rGO/QCS/OREC (+38.5 mV) than that of rGO/QCS/REC (+37.3 mV) indicated that OREC had a better stabilizing effect than REC. The possible assembly mechanism of the rGO/QCS/layered silicate composite was electrostatic interaction and cation exchange. The addition of the layered silicate improved the thermal stability of the composite, and rGO/QCS/OREC showed high uptake (425 mu g/mg) toward double-stranded DNA (dsDNA).
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