Bi<sub>2</sub>WO<sub>6</sub>光催化联合过一硫酸盐降解橙黄Ⅱ

doi:10.19965/j.cnki.iwt.2022-0511

摘要/Abstract

摘要：

利用简便的水热法制备Bi₂WO₆光催化材料，研究光照条件下Bi₂WO₆活化PMS降解橙黄Ⅱ溶液的效果，考察了Bi₂WO₆投加量、PMS质量浓度、初始pH、共存阴离子及腐殖酸（HA）对降解效果的影响。采用XRD、SEM和FT-IR对材料的晶体结构、表面形貌及反应前后结构进行表征分析，结果显示该材料在反应后表现出良好的稳定性。当Bi₂WO₆投加量为0.6 g/L、PMS质量浓度为0.8 g/L、橙黄Ⅱ质量浓度为10 mg/L、pH为7.5时，反应60 min内橙黄Ⅱ的降解率超过97%。实验体系在弱碱性条件下的降解效果最佳。共存离子实验结果表明，溶液中的Cl^-能促进橙黄Ⅱ降解，NO₃^-对降解的影响不明显，SO₄^2-、HCO₃^-、H₂PO₄^-和腐殖酸则对降解有抑制作用。猝灭实验结果显示O₂^·-、¹O₂和h⁺为体系中的主要活性物种。通过电化学阻抗测试对比了不同体系的电子传输效率，光照能有效提高PMS均相体系的电子转移。Bi₂WO₆经过5次循环实验后，依旧表现出良好的降解效果。

关键词: 光催化, 过一硫酸盐, 钨酸铋, 橙黄Ⅱ

Abstract:

Hydrothermal method was used to prepare Bi₂WO₆ photocatalytic materials. The degradation effect of Bi₂WO₆-activated PMS on orange Ⅱ under light conditions was investigated， as well as the influence of Bi₂WO₆ dosage， PMS mass concentration， initial pH， coexisting anions and humic acid （HA）. The crystal structure， surface topography and structure of catalyst before and after the reaction were characterized by XRD， SEM and FT-IR， and the results showed that the material exhibited good stability. When Bi₂WO₆was addd at 0.6 g/L， the mass concentration of PMS was 0.8 g/L， the mass concentration of orange Ⅱ was 10 mg/L and the pH was 7.5， the degradation rate of orange Ⅱ within 60 min of the reaction was over 97%. The experimental system showed the best degradation effect under weak alkaline conditions. The results of coexistence ion experiment showed that Cl^- in water could promote the degradation of orange Ⅱ， NO₃^- had no significant effect on the degradation， while SO₄^2-， HCO₃^-， H₂PO₄^- and humic acid had an inhibitory effect on the degradation. The results of quenching experiments showed that O₂^·-， ¹O₂ and h⁺ were the main active species in the system. The electron transport efficiency of different systems was compared by electrochemical impedance spectroscopy， and light could effectively improve the electron transfer of PMS homogeneous system. Bi₂WO₆ continued to show good degradation after five cycles of experiments.

Key words: photocatalysis, peroxymonosulfate, bismuth tungstate, orange Ⅱ

中图分类号:

X703

庞瑞林, 莫创荣, 许雪棠, 潘杰. Bi₂WO₆光催化联合过一硫酸盐降解橙黄Ⅱ[J]. 工业水处理, 2023, 43(4): 71-77.

Ruilin PANG, Chuangrong MO, Xuetang XU, Jie PAN. Degradation of orange Ⅱ by Bi₂WO₆ photocatalyisis combined with peroxymonosulfate[J]. Industrial Water Treatment, 2023, 43(4): 71-77.

https://www.iwt.cn/CN/Y2023/V43/I4/71

图/表 11

图1 催化剂反应前后的XRD图谱

Fig. 1 XRD patterns of catalysts before and after reaction

图2 催化剂反应前后的SEM照片

Fig. 2 SEM images of catalysts before and after the reaction

图3 不同体系中橙黄Ⅱ的降解效果

Fig. 3 Degradation effect of orange Ⅱ in different systems

图4 Bi₂WO₆投加量对橙黄Ⅱ降解的影响

Fig. 4 Effects of Bi₂WO₆ dosage on orange Ⅱ degradation

图5 PMS投加质量浓度对橙黄Ⅱ降解的影响

Fig. 5 Effects of PMS mass concentration on orange Ⅱ degradation

图6 溶液初始pH对橙黄Ⅱ降解的影响

Fig. 6 Effects of initial pH on orange Ⅱ degradation

表1 不同体系中PMS消耗量

Table 1 PMS consumption in different systems

体系	光/Bi₂WO₆/PMS	暗/Bi₂WO₆/PMS	光/PMS
PMS消耗量/%	23.66	9.36	5.28

图7 共存离子和腐殖酸对橙黄Ⅱ降解的影响

Fig.7 Effects of coexisting ions and humic acid on orange Ⅱ degradation

表2 自由基猝灭实验结果

Table 2 Results of free radical quenching experiments

猝灭剂	BQ	LH	Na₂C₂O₄	TBA	MeOH
降解率/%	5.04	13.66	26.49	68.68	56.90

图8 不同体系的电化学阻抗图谱

Fig. 8 Electrochemical impedance spectroscopy in different systems

表3 催化剂的重复利用性

Table 3 reusability experiment of catalyst

循环次数	第1次	第2次	第4次	第4次	第5次
降解率/%	97.11	94.94	92.51	91.23	90.97

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Bi₂WO₆光催化联合过一硫酸盐降解橙黄Ⅱ

Degradation of orange Ⅱ by Bi₂WO₆ photocatalyisis combined with peroxymonosulfate

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Bi2WO6光催化联合过一硫酸盐降解橙黄Ⅱ

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Bi₂WO₆光催化联合过一硫酸盐降解橙黄Ⅱ

Degradation of orange Ⅱ by Bi₂WO₆ photocatalyisis combined with peroxymonosulfate