PoPD-TiO2-GO复合光催化剂在化工染料废水吸附降解中的应用

doi:10.3969/j.issn.1001-1803.2022.10.008

摘要/Abstract

摘要：

采用石墨粉、磷酸、浓硫酸等试剂制备TiO₂-GO复合光催化剂,并在该催化剂基础上添加邻苯二胺制得PoPD-TiO₂-GO复合光催化剂,同时制备活性黑KN-B化工染料废水,向染料废水中依次加入两种催化剂,并通过光反应仪器、热重分析仪等仪器分析催化剂吸附降解能力。经实验验证：两种催化剂中石墨烯添加量过大虽然会增加比表面积,但会导致吸光度下降,添加3%石墨烯的两种催化剂效果较佳;随着吸附时间的增长,PoPD-TiO₂-GO的吸附率与脱色率明显高于TiO₂-GO,且两种催化剂的用量越大,对化工染料废水的脱色能力就越强;PoPD-TiO₂-GO经4次循环降解后脱色率依然保持在70%以上,当选取多种废水染料实验时,PoPD-TiO₂-GO均能够维持较高的脱色率,因此,PoPD-TiO₂-GO复合光催化剂的降解性能较好,可以降解多种染料废水,同时PoPD-TiO₂-GO的综合吸附降解能力要高于TiO₂-GO。

关键词: 催化剂, 化工染料废水, 吸附降解, 吸光度, 循环降解

Abstract:

TiO₂-GO composite photocatalyst was prepared using graphite powder, phosphoric acid and sulfuric acid. On the basis of this catalyst, o-phenylendiamine was added to prepare the PoPD-TiO₂-GO composite photocatalyst. The simulated chemical dye wastewater containing reactive black KN-B was prepared. These two new catalysts were added to the chemical dye wastewater, and the abilities of the catalysts in adsorption and degradation were analyzed on the light reaction apparatus and thermogravimetric analyzer. The experimental results show that, excessive addition of graphene in the two catalysts will increase the specific surface area but will lead to the decrease of absorbance. Therefore, the two catalysts with 3% graphene have better effects; With the increase of adsorption time, the adsorption rate and decolorization rate of PoPD-TiO₂-GO are significantly higher than those of TiO₂-GO. The greater the amount of the two catalysts, the stronger the decolorization capacity to chemical dye wastewater; the decolorization rate of PoPD-TiO₂-GO remains above 70% after four cycles of degradation. When a variety of wastewater dyes are selected for the experiment, PoPD-TiO₂-GO can still maintain a high decolorization rate. Therefore, the degradation performance of PoPD-TiO₂-GO photocatalyst is good, which can degrade a variety of dye wastewater. In addition, the comprehensive ability of adsorption and degradation of PoPD-TiO₂-GO is higher than that of TiO₂-GO.

Key words: catalyst, chemical dye wastewater, adsorption degradation, absorbance, cyclic degradation

中图分类号:

O643.36

张勤,石秋红. PoPD-TiO₂-GO复合光催化剂在化工染料废水吸附降解中的应用[J]. 日用化学工业（中英文）, 2022, 52(10): 1088-1093.

Zhang Qin,Shi Qiuhong. Application of PoPD-TiO₂-GO composite photocatalyst in adsorption and degradation of chemical dye wastewater[J]. China Surfactant Detergent & Cosmetics, 2022, 52(10): 1088-1093.

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催化剂类型	w（石墨烯）/%	孔径分布/（cm³/g）	比表面积/（m²/g）	吸光度/%
TiO₂-GO光催化剂	0	0.086	34.7	87.4
	1	0.078	36.7	84.3
	2	0.079	38.2	74.6
	3	0.082	43.6	68.9
	5	0.083	53.8	54.2
	10	0.085	64.9	51.3
PoPD-TiO₂-GO光催化剂	0	0.078	38.4	96.4
	1	0.087	42.7	91.4
	2	0.089	53.8	85.8
	3	0.079	58.5	79.5
	5	0.076	68.5	63.2
	10	0.083	76.8	59.9

染料名称	相对分子质量	30 min脱色率/%	60 min脱色率/%
活性蓝B	851	81.6	85.8
活性艳红KE-3B	1 470	82.6	86.9
活性红MS	999	82.4	85.7
酸性黑324	851	83.8	87.7
直接枣红GB	712	84.1	93.4
直接黄棕D3G	656	83.5	91.5
直接灰D	618	84.2	89.6
媒介黑PV	383	81.5	91.5

PoPD-TiO₂-GO复合光催化剂在化工染料废水吸附降解中的应用

Application of PoPD-TiO₂-GO composite photocatalyst in adsorption and degradation of chemical dye wastewater

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