g-C3N4/TiO2复合材料制备及其处理罗丹明B研究

doi:10.19964/j.issn.1006-4990.2022-0565

Abstract

Abstract:

In order to improve the organic dye removal performance，a series of g-C₃N₄/TiO₂ composites with different mass ratios were synthesized by hydrothermal method with using g-C₃N₄ as organic semiconductor and TiO₂ as inorganic semiconductor.The orthogonal test L₁₆（4⁵） was used to explore the optimal process conditions for g-C₃N₄/TiO₂ composites to treat rhodamine B simulated printing and dyeing wastewater.The results showed that the optimum conditions were as the following：the light time was 180 min，the mass ratio of g-C₃N₄ to TiO₂ was 20:30，the dosage of g-C₃N₄/TiO₂ was 2.0 g/L，the concentration of rhodamine B was 20 mg/L，the pH value was 6.50，the removal rate was up to 98.86%.However，the removal rate of g-C₃N₄ and TiO₂ for rhodamine B were 52.27% and 89.71%，respectively，which was indicated that g-C₃N₄ doped with TiO₂ could enhance the synergistic removal efficiency of Rhodamine B.Radical scavenger experiments showed that superoxide radical（·O₂^-） and photogenerated holes（h⁺） played a crucial role.The removal rate of rhodamine B could reach 90.79% after four cycles of g-C₃N₄/TiO₂ composites.The result indicated that g-C₃N₄/TiO₂ composites could reduce energy consumption and cause no secondary pollution，which would provide reference for wastewater treatment in the future.

Key words: g-C₃N₄, TiO₂, rhodamine B, printing and dyeing wastewater

CLC Number:

TQ134.11

CHEN Zhangxu, ZHU Danchen, FU Minglian. Study on preparation of g-C₃N₄/TiO₂composites and application for rhodamine B removal[J]. Inorganic Chemicals Industry, 2023, 55(7): 130-136.

Figures/Tables 11

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m（g-C₃N₄）: m（TiO₂）	m（g-C₃N₄）/ g	m（TiO₂）/ g	代号
0:50	0.00	0.50	CNTO05
10:40	0.10	0.40	CNTO14
20:30	0.20	0.30	CNTO23
30:20	0.30	0.20	CNTO32
40:10	0.40	0.10	CNTO41
50:0	0.50	0.00	CNTO50

水平	因素
水平	A （光照时间）/min	B ［m（g-C₃N₄）: m（TiO₂）］	C （RhB初始质量浓度）/（mg·L^-1）	D （复合材料投加量）/（g·L^-1）	E （pH）
1	45	10:40	10.0	1.0	5.50
2	90	20:30	20.0	2.0	6.00
3	180	30:20	50.0	3.0	6.50
4	270	40:10	100.0	4.0	7.00

实验编号	A （光照时间）/min	B ［m（g-C₃N₄）: m（TiO₂）］	C（RhB初始质量浓度）/（mg·L^-1）	D（复合材料投加量）/ （g·L^-1）	E （pH）	去除率/%
1	45	10:40	10.0	1.0	5.50	70.96
2	45	20:30	20.0	2.0	6.00	95.00
3	45	30:20	50.0	3.0	6.50	83.12
4	45	40:10	100.0	4.0	7.00	37.65
5	90	10:40	20.0	3.0	7.00	94.35
6	90	20:30	10.0	4.0	6.50	94.98
7	90	30:20	100.0	1.0	6.00	48.49
8	90	40:10	50.0	2.0	5.50	78.53
9	180	10:40	50.0	4.0	6.00	91.33
10	180	20:30	100.0	3.0	5.50	76.29
11	180	30:20	10.0	2.0	7.0	94.62
12	180	40:10	20.0	1.0	6.50	93.87
13	270	10:40	100.0	2.0	6.50	45.94
14	270	20:30	50.0	1.0	7.00	64.57
15	270	30:20	20.0	4.0	5.50	55.39
16	270	40:10	10.0	3.0	6.00	60.27
k₁	71.68	75.65	80.21	69.47	70.29
k₂	79.09	82.71	84.65	78.52	73.77
k₃	89.03	70.41	79.39	78.51	79.48
k₄	56.54	67.58	52.09	69.84	72.80
R	32.49	15.13	32.56	9.05	9.19
因素主次 C、A、B、E、D
最适宜方案 A₃B₂C₂D₂E₃

代号	m（g-C₃N₄）: m（TiO₂）	RhB初始质量浓度/（mg·L^-1）	复合材料投加量/（g·L^-1）	pH	暗反应		光降解
代号	m（g-C₃N₄）: m（TiO₂）	RhB初始质量浓度/（mg·L^-1）	复合材料投加量/（g·L^-1）	pH	吸附时间/min	吸附率/%	光照时间/min	去除率/%
CNTO23	20:30	20.0	2.0	6.50	1 440	9.41	180	98.86
CNTO05	0:50	20.0	2.0	6.50	1 440	8.52	180	89.71
CNTO50	50:0	20.0	2.0	6.50	1 440	9.76	180	52.27

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Study on preparation of g-C₃N₄/TiO₂composites and application for rhodamine B removal

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Study on preparation of g-C3N4/TiO2 composites and application for rhodamine B removal