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Int. J. Environ. Res. Public Health 2019, 16(3), 510;

Study on Analysis and Sedimentation of Alumina Nanoparticles

College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
Key Laboratory of Marine Chemistry and Application (Xiamen University), Fujian Province University, Xiamen 361102, China
SGS-CSTC Standard Technical Services Co., Ltd., Xiamen Branch, Xiamen 361101, China
Author to whom correspondence should be addressed.
Received: 26 December 2018 / Revised: 21 January 2019 / Accepted: 31 January 2019 / Published: 12 February 2019
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Dispersion and aggregation behavior of nanoparticles in aquatic environment may be affected by pH, salinity, and dissolved organic matter, which would change its ecological risk. Effects of time, power and temperature on the alumina nanoparticles (nano-Al2O3) ultrasonic dispersion in water were discussed. Al2O3 had a best ultrasonic dispersion for 30 min at 105 W and 30 °C. The concentration of Al2O3 could be measured by ultraviolet (UV) spectrophotometer, and the method was efficient and accurate. Furthermore, the sedimentation rate of Al2O3 was related to pH, salinity, and its concentration in the artificial seawater. When pH was 7.31, approaching the isoelectric point of Al2O3, they aggregated and settled fastest. Settlement coefficient (k) of Al2O3 increased by 3 and 2.7 times while the salinity and its concentration increased. The sedimentation rate was higher in natural seawater than that in artificial seawater. All results indicated that nano-Al2O3 would be removed in aquatic environment. View Full-Text
Keywords: alumina nanoparticles; analysis method; sedimentation; pH; salinity alumina nanoparticles; analysis method; sedimentation; pH; salinity

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Zheng, X.; Li, Y.; Chen, D.; Zheng, A.; Que, Q. Study on Analysis and Sedimentation of Alumina Nanoparticles. Int. J. Environ. Res. Public Health 2019, 16, 510.

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