Freely standing MgAl-layered double hydroxides nanosheets and their derived metal oxides on g-C3N4 thin-layer designed for obtaining synergic effect of adsorption and photocatalysis
Freely standing MgAl-layered double hydroxides nanosheets and their derived metal oxides on g-C3N4 thin-layer designed for obtaining synergic effect of adsorption and photocatalysis
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独立式MgAl层状双氢氧化物纳米片及其衍生的金属氧化物在g-C3N4薄层上设计用于获得吸附和光催化的协同效应
DOI：
10.1016/j.clay.2019.105131
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发表时间：
2019-05
影响因子：
5.6
通讯作者：
Li Jia
中科院分区：
文献类型：
--
作者：
Wang Ping;Ng Dickon H L;Zhou Mingyuan;Li Jia
水中有机化合物污染严重威胁着公众健康和地球上的其他生物。在这里，我们报道了一种新的层次化结构，在g-C3N4纳米片上自由放置的镁铝层状双氢氧化物(LDH)纳米片用于超快去除水中的染料。这种开放的层次化结构由相互交织的g-C3N4和MgAl-LDH纳米片组成，在模拟太阳光照射下表现出有效的吸附-光催化协同效应和对水中阴离子污染物的高效去除。光催化降解刚果红的速率常数高达0.1011 −1，是g-C3N4的3.9倍。结果表明，带正电荷的LDH层有利于阴离子污染物在g-C3N4周围的聚集，有效地缩短了扩散距离，从而加速了有机污染物的降解。此外，还发现LDH表面的-OH基团通过捕获光生空穴来抑制光生电子-空穴对的复合。此外，·O2-是光催化降解过程中的主要活性物种。该吸附-光催化协同体系在水体有机污染物的吸附、去除和氧化方面具有广阔的应用前景。
Organic compound contamination in water is a serious threat to the public health and other organisms on earth. Here, we report a novel hierarchical architecture of freely standing MgAl-layered double hydroxides (LDH) nanosheets on g-C3N4nanosheets for ultrafast dye removal from water. This open hierarchical structure consisted of interlaced g-C3N4and MgAl-LDH nanosheets, and exhibited effective adsorption-photocatalysis synergic effect and high efficient removal of anionic pollutants from water under simulated sunlight irradiation. The rate constant of photocatalytic degradation toward congo red (CR) was high as 0.1011 min−1, which was 3.9 time than that of g-C3N4. It was demostrated that positively charged LDH layers were in favor of the enrichment of anionic pollutants around g-C3N4, which effectively shortened diffusion distance and thus accelerated the degradation of organic pollutant. Furthermore, it was found that –OH groups on surface of LDH suppressed the recombination of photo generated electron-hole pairs by capturing photo generated holes. Moreover, •O2–was demonstrated as the main reactive species in the photocatalytic degradation process. This adsorption-photocatalysis synergic system may be a promising candidate in adsorbing, removing and oxidizing organic contaminants from water body.
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影响因子：
--
作者：
Jia Li;Ning Zhang;D. Ng
通讯作者：
Jia Li;Ning Zhang;D. Ng
多孔g-C3N4的等电点和吸附活性
影响因子：
6.7
作者：
Zhu, Bicheng;Xia, Pengfei;Ho, Wingkei;Yu, Jiaguo
通讯作者：
Yu, Jiaguo
DOI：
10.1002/chin.201450233
发表时间：
2014-12
期刊：
ChemInform
影响因子：
--
作者：
Guoli Fan;Feng Li;D. Evans;X. Duan
通讯作者：
Guoli Fan;Feng Li;D. Evans;X. Duan
煅烧层状双氢氧化物从水溶液中吸收氯离子：平衡和动力学研究
影响因子：
12.8
作者：
Lv, LA;He, J;Duan, X
通讯作者：
Duan, X
影响因子：
3.9
作者：
Yan, S. C.;Li, Z. S.;Zou, Z. G.
通讯作者：
Zou, Z. G.