Investigation of inhibitory influence of cinnamomum camphora leaf extract on hydrogen evolution from Al-Zn dust in wet dust removal

doi:10.16265/j.cnki.issn1003-3033.2025.07.1677

Abstract

Abstract:

In order to promote the safe and eco-friendly operation of wet dust collection systems by mitigating hydrogen fire and explosion risks caused by metal waste dust in contact with water, a custom-designed metal-water hydrogen evolution testing system and a water-based Cinnamomum camphor leaf extract (prepared via decoction) were utilized. Experiments assessed the hydrogen suppression efficiency of Cinnamomum camphor leaf extract at various mass concentrations. Surface analysis and theoretical calculations were conducted to study the adsorption behavior, chemical reaction kinetics, and inhibition mechanism of Cinnamomum camphor leaf extract on hydrogen evolution from aluminum-zinc (Al-Zn) dust. The hydrogen suppression stability at the optimal mass concentration was evaluated under varying environmental conditions. Experimental results demonstrated that higher mass concentrations of extract improved its ability to suppress hydrogen evolution from Al-Zn dust. At a mass concentration of 50 mg/L, the hydrogen suppression efficiency reached 97.86%, and the reaction rate constant was nearly zero, suggesting negligible hydrogen production. Cinnamomum camphor leaf extract spontaneously adsorbs onto the Al-Zn dust surface, following the monolayer Langmuir model and involving both physical and chemical adsorption. The surface analysis reveals that Cinnamomum camphor leaf extract forms a protective film on the Al-Zn dust via complexation, effectively preventing dust-water contact and suppressing hydrogen evolution. Tests under varying external conditions demonstrated that Cinnamomum camphor leaf extract consistently suppressed hydrogen evolution from Al-Zn dust, despite variations in temperature fluctuations, pressure changes, and water disturbances in the wet dust collection system.

Key words: Cinnamomum camphor leaf extract, wet dust collection, aluminum-zinc (Al-Zn) dust, hydrogen inhibitor, hydrogen suppression efficiency, adsorption behavior

CLC Number:

X964工业防尘

HAO Tengteng, XU Kaili, WANG Haojie, NI Chenyang, SHI Jihang. Investigation of inhibitory influence of cinnamomum camphora leaf extract on hydrogen evolution from Al-Zn dust in wet dust removal[J]. China Safety Science Journal, 2025, 35(7): 159-166.

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质量浓度/ (mg·L^-1)	k/h^-1	质量浓度/ (mg·L^-1)	k/h^-1
5	0.001 2	25	3.264 3×10^-4
7.5	0.001 0	37.5	2.360 9×10^-4
10	4.670 2×10^-4	50	1.702 6×10^-4
15	3.480 5×10^-4	—	—

EDS测试粉末	Al	Zn	O
原粉	88.80	9.78	1.42
对照组的反应产物	55.08	0.15	44.77
50 mg/L抑制液的反应产物	87.62	9.99	2.39