The design of a polyaniline-decorated three dimensional W18O49 composite for full solar spectrum light driven photocatalytic removal of aqueous nitrite with high N-2 selectivity
The design of a polyaniline-decorated three dimensional W18O49 composite for full solar spectrum light driven photocatalytic removal of aqueous nitrite with high N-2 selectivity
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聚苯胺修饰的三维 W18O49 复合材料的设计，用于全太阳光谱光驱动光催化去除亚硝酸盐水溶液，具有高 N-2 选择性
DOI：
10.1016/j.scitotenv.2018.12.362
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发表时间：
2019
影响因子：
9.8
通讯作者：
Zhang Yongqing
中科院分区：
文献类型：
--
作者：
Zhao Xuesong;Xu Hao;Huang Shaobin;You Yingying;Li Han;Xu Xinrong;Zhang Yongqing
利用太阳能的光催化技术是最有前途的绿色亚硝酸盐去除技术。然而，有效的光催化性能通常受到有限的光吸收、昂贵的贵金属的利用和不期望的产物（硝酸盐和铵）的挑战。本文首次报道了一种全日光响应的聚苯胺修饰的三维W18 O 49复合材料（PANI@W18O49），一种不含贵金属的光催化剂，对水中的亚硝酸盐具有良好的光催化活性和高的N2选择性.通过XRD、拉曼、FTIR、SEM、TEM、UV-vis DRS和PL对样品进行了表征。结果表明，在300 W氙灯照射60 min下，不加牺牲剂的PANI@W18O49对N2的选择性（初始浓度1.0 mM）可达80%以上。这些优势归因于n型W18 O 49和p型PANI之间的内置结，为NO2−反应提供了合适的电子-空穴对氧化还原水平。PANI的改性也有利于光捕获能力和活化载流子迁移，PANI@W18O49的计算速率常数约为W18 O 49的4倍。本研究不仅制备了一种有前途的光催化剂，而且为提高光催化剂的活性和N2选择性提供了新的思路。
Photocatalysis using solar energy is the most promising green technology for nitrite removal. However, effective photocatalytic performance is often challenged by the limited light absorption, utilization of expensive noble metals and undesired products (nitrate and ammonium). Here, we report for the first time that a full solar light response polyaniline-decorated three dimensional W18O49composite (PANI@W18O49), a noble metal-free photocatalyst, possesses excellent photocatalytic activity for aqueous nitrite removal with high N2selectivity. The prepared sample was thoroughly identified via XRD, Raman, FTIR, SEM, TEM, UV–vis DRS and PL. The catalytic results demonstrated that over 80% N2selectivity (initial concentration 1.0 mM) was achieved through the PANI@W18O49without sacrificial agent under 300 W Xe lamp irradiation for 60 min. Such advantages were attributed to the built-in junction between n-type W18O49and p-type PANI, offering suitable redox levels of electron-hole pairs for NO2−reaction. The modification of PANI also benefited the light harvesting ability and activated carriers migration, the calculated rate constant of PANI@W18O49is about four times as high as that of W18O49. The current study not only prepared a promising photocatalyst, but also provides new insights into improving the photocatalytic activity and N2selectivity for nitrite treatment.