Enhanced adsorption and photocatalytic activities of ultrathin graphitic carbon nitride nanosheets: Kinetics and mechanism
Publication in refereed journal

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其它資訊
摘要Different from most composite structures with a common configuration of adsorbent-catalyst, g-C3N4 thin nanosheets (CNNS) with the thickness of 8-11 nm had more efficient and stable adsorption and photocatalytic activities in the removal of tetracycline (TC) from aqueous solution. In comparison with common g-C3N4 counterparts, the adsorption performance of CNNS increased by at least 10.3 times and that for photocatalytic efficiency increased for more than 4.8 times. The large contact area and delocalized pi bonds provided by CNNS resulted in the enhanced TC adsorption capacity. The efficient separation and prolonged-lifetimes of photo-generated charge carriers, and the strong adsorption brought about a reinforced photocatalytic activity for TC degradation. The adsorption of TC onto CNNS was well followed the pseudo-second-order adsorption kinetics, and the obtained adsorption isotherm was well fitted to the Langmuir isotherm model. Due to the efficient adsorption and photocatalysis of CNNS, the zero-order and first-order kinetics models were presented during the different reaction time for TC photodegradation, the h(+), center dot O-2(-) and center dot OH radicals were confirmed as the major reactive oxidative species, and the degradation products were determined. This study provided a new route for the development of catalysts with efficient adsorption and photocatalytic activity in the purification of organic wastewaters.
著者Cheng Tian, Hui Zhao, Hongli Sun, Kemeng Xiao, Po Keung Wong
期刊名稱Chemical Engineering Journal
出版年份2020
月份2
日期1
卷號381
出版社Elsevier
出版地New York
文章號碼122760
國際標準期刊號1385-8947
電子國際標準期刊號1873-3212
語言美式英語
關鍵詞g-C3N4 nanosheets, Antibiotic removal, Adsorption-photocatalytic activity, Kinetics, Mechanism

上次更新時間 2020-29-07 於 23:52