Rapid synthesis of chitosan-capped gold nanoparticles for analytical application and facile recovery of gold from laboratory waste


Other Title:
การสังเคราะห์อนุภาคทองคำนาโนโดยใช้ไคโตซานสำหรับใช้ในงานวิเคราะห์และวิธีการอย่างง่ายในการนำทองคำกลับมาจากของเสียซึ่งเกิดจากปฏิบัติการ
Date:
2020-12-15
Publisher:
Carbohydrate Polymers
Abstract:
Chitosan-capped gold nanoparticles (CS-AuNPs) were synthesized via a rapid method by exposing 0.75 mL of 10 mM HAuCl4 and 5 mL of 0.1% w/v chitosan solution to microwave irradiation at 125 °C for 40 s. The resulting red colloidal solution contained monodispersed, spherical, and stable CS-AuNPs with a mean diameter of 17.8 nm and showed the maximum absorption peak at 520 nm. Owing to the positively charged surface, CS-AuNPs were applied to the assay of the polyanionic compound disodium edetate based on the aggregation-induced red-to-blue color change of the particles and the measurement of increased absorbance at 670 nm. The assay was accurate and precise; its results were comparable to those obtained from the titrimetric reference method. Moreover, gold was shown to be easily recovered from CS-AuNPs through alkaline-induced precipitation followed by acid treatment and heating, which provides a facile and efficient means for treatment of laboratory waste.
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Award:
ผลงานโดดเด่น คณะเภสัชศาสตร์ ปีการศึกษา 2563
Rights Holder:
มหาวิทยาลัยศิลปากร
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