ZnO/g-C3N4异质结光催化材料的制备及对吡啶的降解

doi:10.19964/j.issn.1006-4990.2023-0527

Abstract

Abstract:

The ZnO/g-C₃N₄ heterojunction photocatalytic materials were prepared by evaporation solvent-high temperature thermal polymerization method.They were systematically characterized by XRD，FTIR，TEM，XPS，UV-vis DRS，PL，TPC and EIS.The activity and stability of ZnO/g-C₃N₄ photocatalytic degradation of pyridine were evaluated.The effects of different factors on the photocatalytic performance were investigated by L₉（3⁴） orthogonal experiment，and the photocatalytic mechanism was discussed.XPS and TEM results proved the formation of heterojunction between ZnO and g-C₃N₄.The formation of heterojunction effectively promoted the separation of photoelectron-holes，improved the light absorption and broadened the spectral range.Under the conditions of ZnO/g-C₃N₄ composite photocatalyst dosage of 50 mg，ZnO/g-C₃N₄ mass ratio of 1∶2，pyridine initial concentration of 20 mg/L and system pH of 7.0，the photocatalytic degradation rate of pyridine by ZnO/g-C₃N₄ reached 98.9% after visible light irradiation for 60 min，and the photocatalytic degradation rate was 97.3% after 5 cycles，which had good stability.The photocatalytic degradation of pyridine by ZnO/g-C₃N₄ was mainly dependent on the action of superoxide radicals（·O₂^-） and holes（h⁺）.

Key words: ZnO/g-C₃N₄, photocatalysis, heterojunction, pyridine

CLC Number:

O643.36

TANG Bei. Preparation of ZnO/g-C₃N₄ heterojunction photocatalytic material and its degradation of pyridine[J]. Inorganic Chemicals Industry, 2024, 56(4): 133-142.

Figures/Tables 13

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次数	因素				吡啶降解率/%
次数	催化剂投加量/mg	m（ZnO）∶ m（g-C₃N₄）	吡啶初始质量浓度/（mg·L^-1）	体系 pH	吡啶降解率/%
1	40	1∶2	10	6.0	92.3
2	40	1∶1	20	7.0	92.1
3	40	1∶3	30	8.0	89.8
4	50	1∶2	20	8.0	96.2
5	50	1∶1	30	6.0	89.6
6	50	1∶3	10	7.0	90.5
7	60	1∶2	30	7.0	91.3
8	60	1∶1	10	8.0	86.7
9	60	1∶3	20	6.0	89.5
验证	50	1∶2	20	7.0	98.9
均值1	91.400	93.267	89.833	90.467
均值2	92.100	89.467	92.600	91.300
均值3	89.167	89.933	90.233	90.900
极差	2.933	3.800	2.767	0.833

循环次数	吡啶降解率/%	循环次数	吡啶降解率/%
1	98.9	4	97.8
2	98.5	5	97.3
3	98.1

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Preparation of ZnO/g-C₃N₄ heterojunction photocatalytic material and its degradation of pyridine

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Preparation of ZnO/g-C3N4 heterojunction photocatalytic material and its degradation of pyridine