超薄二维Au@BiVO<sub>4</sub>纳米片光催化降解HPAM

doi:10.19965/j.cnki.iwt.2020-1256

摘要/Abstract

摘要：

针对钻井废液中有机物难降解的难题，首先利用两相法制备了单斜晶相的超薄二维BiVO₄纳米片，然后利用光还原法在BiVO₄表面沉积Au纳米粒子，制得超薄二维Au@BiVO₄纳米片，用于光催化降解聚丙烯酰胺（HPAM）。考察了催化剂的制备条件、催化剂投加量、HPAM初始浓度对光催化降解性能的影响，探究了其光催化降解HPAM的机理。结果表明，当n（Au）：n（BiVO₄）为1：100时，所得到的产品对HPAM的光催化降解效果最好，其降解效果主要依靠催化剂在光照条件下产生·OH来实现。

关键词: 两相法, Au@BiVO₄, 光催化降解, 聚丙烯酰胺

Abstract:

Aiming the problem of organic compound hard degradation in drilling waste liquid, two-dimensional ultrathin BiVO₄ nanosheets with monoclinic crystal phase were firstly prepared via a simple two-phase method, followed by the deposition of Au nanoparticles under the irradiation. The prepared nanosheets was used to photocatalytic degradation of polyacrylamide(HPAM). The effects of the preparation conditions, the dosage of the photocatalyst and the initial concentration of the hydrolyzed polyacrylamide(HPAM) on the performance of the photocatalytic degradation efficiency were studied. The mechanism of photocatalytic degradation of HPAM was investigated as well. The results showed that Au@BiVO₄ nanosheets exhibited the highest photocatalytic efficiency for HPAM degradation when the molar ratio of Au to BiVO₄ was 1:100. And the photocatalytic degradation mechanism is mainly depended on the ·OH.

Key words: two-phase method, Au@BiVO₄, photocatalytic degradation, polyacrylamide

中图分类号:

X703.1

董泽坤,李辉,姚诗余,刘轶,鲁新,刘汉军. 超薄二维Au@BiVO₄纳米片光催化降解HPAM[J]. 工业水处理, 2021, 41(9): 74-80.

Zekun Dong,Hui Li,Shiyu Yao,Yi Liu,Xin Lu,Hanjun Liu. Ultrathin two-dimensional Au@BiVO₄ nanosheets for photocatalytic degradation of polyacrylamide[J]. Industrial Water Treatment, 2021, 41(9): 74-80.

https://www.iwt.cn/CN/Y2021/V41/I9/74

图/表 10

图1 不同投料比条件下制备的Au@BiVO₄纳米片的形貌
（a）~（c）不同Au负载量Au@BiVO₄的TEM；（d）~（f）不同Au负载量Au@BiVO₄的SEM；（g）Au@BiVO₄-1∶100的HRTEM；（h）BiVO₄表面Au纳米粒子的选区电子衍射图；（i）BiVO₄纳米片的高倍SEM

Fig.1 Morphology of Au@BiVO₄ nanosheets prepared under different feeding ratios

图2 不同Au负载量的Au@BiVO₄的XRD

Fig.2 XRD of Au@BiVO₄ with different Au content

表1 Au@BiVO₄复合材料Au实际摩尔分数

Table 1 Au@BiVO₄ composite material Au actual mass fraction

催化剂种类	Au实际摩尔分数/%
Au@BiVO₄-1:50	1.47
Au@BiVO₄-1:100	0.58
Au@BiVO₄-1:300	0.15

图3 Au@BiVO₄-1∶100的XPS

Fig.3 XPS of Au@BiVO₄-1∶100

图4 BiVO₄与Au@BiVO₄-1∶100的EDS

Fig.4 EDS of BiVO₄ and Au@BiVO₄-1∶100

图5 BiVO₄复合材料中Au负载量对光催化降解HPAM性能的影响

Fig.5 Effect of Au deposition amount of Au@BiVO₄ composite material on the performance of photocatalytic degradation of HPAM

图6 Na₂TP检测ROS前后的荧光光谱和不同比例Au@BiVO₄产生ROS的能力

Fig.6 Fluorescence spectra before and after detection of ROS by disodium terephthalate and the ability of Au@BiVO₄ to generate ROS in different proportions

图7 HPAM初始浓度对Au@BiVO₄-1∶100光催化降解HPAM性能的影响

Fig.7 Effect of initial concentration of HPAM on the photocatalytic degradation of HPAM performance of Au@BiVO₄-1:100 composite

图8 光催化剂投加量对降解HPAM性能的影响

Fig.8 The influence of the dosage of photocatalyst on the degradation performance of HPAM

图9 加入IPA前后Au@BiVO₄对HPAM的光催化降解曲线

Fig.9 Photocatalytic degradation curves of Au@BiVO₄ on HPAM before and after IPA

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超薄二维Au@BiVO₄纳米片光催化降解HPAM

Ultrathin two-dimensional Au@BiVO₄ nanosheets for photocatalytic degradation of polyacrylamide