Alkali metal doped crystalline g-C(3)N(4) with an enriched cyano group for visible-light photocatalytic degradation of methylamine.
Alkali metal doped crystalline g-C(3)N(4) with an enriched cyano group for visible-light photocatalytic degradation of methylamine.
复制标题
作者：
本研究采用熔盐法合成了富氰基的碱金属掺杂结晶g-C3N4，并将其用于可见光光催化降解甲胺（MA），甲胺是一种常见的低气味阈值有机胺化合物。在二次煅烧过程中加入不同类型和比例的熔融盐（Li、K和Na），以调节石墨氮化碳（g-C3N4）的形貌、结晶度和表面缺陷。采用与二元盐体系熔点相匹配的熔盐处理，制备了具有高比表面积和良好结晶度的氰基与碱金属共掺杂的g-C3N4晶体。在结晶g-C3N4上共修饰碱金属和氰基有利于MA的吸附，实现了优异的光电荷转移效率，产生了更多的超氧自由基。与原始g-C3N4 （PCN）相比，LiK15: 5-CCN降解MA的表观速率常数提高了10.2倍，在可见光照射90 min后，对1000 ppm MA气体的降解效率为93.1%，而PCN的降解效率为19.2%。本研究通过熔盐处理证明了碱金属掺杂的富氰基g-C3N4晶体，改善了甲胺的降解。共同装饰增强了电子密度、甲胺吸附、光电荷转移和超氧化物自由基的产生。
In this study, alkali-metal-doped crystalline g-C3N4 with an enriched cyano group was synthesized using the molten salt method and used for the visible-light photocatalytic degradation of methylamine (MA), a common organic amine compound with a low odor threshold. Different types and proportions of melting salts (Li, K, and Na) were added during secondary calcination to regulate the morphology, crystallinity, and surface defects of graphitic carbon nitride (g-C3N4). With molten salt treatment matched the melting point of the binary salt system, a cyano group and alkali metal co-doped crystalline g-C3N4 with a high surface area and good crystallinity were prepared. Co-decorating the alkali metal and cyano groups on crystalline g-C3N4 facilitated the adsorption of MA, realized an excellent photo-charge transfer efficiency, and generated more superoxide radicals. Compared with pristine g-C3N4 (PCN), the apparent rate constant of LiK15 : 5-CCN for the degradation of MA increased by 10.2 times and the degradation efficiency of 1000 ppm MA gas was 93.1% after 90 min of irradiation with visible light, whereas the degradation efficiency of PCN was 19.2%. This study demonstrated alkali metal doped crystalline g-C3N4 with enriched cyano group via molten salt treatment, improving methylamine degradation. Co-decoration enhanced electron density, methylamine adsorption, photo-charge transfer, and superoxide radical generation.
登录
查看更多内容
DOI：
10.3390/nano10091751
发表时间：
2020-09-04
期刊：
Nanomaterials (Basel, Switzerland)
影响因子：
--
作者：
Gao Y;Duan J;Zhai X;Guan F;Wang X;Zhang J;Hou B
通讯作者：
Hou B
影响因子：
6.7
作者：
Aksoy, Merve;Korkut, Sibel Eken;Metin, Onder
通讯作者：
Metin, Onder
影响因子：
8.8
作者：
Arumugam, Malathi;Tahir, Muhammad;Praserthdam, Piyasan
通讯作者：
Praserthdam, Piyasan
城市渗滤液处理过程中恶臭挥发性有机物的污染概况、去除性能和健康风险降低
影响因子：
11.1
作者：
Liao, Wen;Liang, Zhishu;An, Taicheng
通讯作者：
An, Taicheng
DOI：
10.1002/chem.202200705
发表时间：
2022-06-10
期刊：
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子：
--
作者：
通讯作者：
--