Efficient Degradation of Organic Dye Acid Red G by UV185 Combined with Periodate

doi:10.16258/j.cnki.1674-5906.2025.01.012

Ecology and Environment ›› 2025, Vol. 34 ›› Issue (1): 108-117.DOI: 10.16258/j.cnki.1674-5906.2025.01.012

• Research Article [Environmental Science] • Previous Articles Next Articles

Efficient Degradation of Organic Dye Acid Red G by UV₁₈₅ Combined with Periodate

ZHU Xiansheng(), TANG Yuchao^*(), WU Changnian, HUANG Xianhuai, WANG Kun

Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse/Anhui Jianzhu University, Hefei 230601, P. R. China

Received:2024-08-17 Online:2025-01-18 Published:2025-01-21
Contact: TANG Yuchao

UV₁₈₅联合高碘酸盐高效降解有机染料酸性红G

朱先胜(), 唐玉朝^*(), 伍昌年, 黄显怀, 王坤

安徽建筑大学/环境污染控制与资源化安徽省重点实验室，安徽合肥 230601

通讯作者: 唐玉朝
作者简介:朱先胜（1999年生），男（回族），硕士研究生，研究方向为水处理理论与技术。E-mail: 1305830025@qq.com
基金资助:
安徽省自然科学基金项目(2208085US20);安徽省教育厅创新团队项目(2022AH010019);安徽省高校协同创新项目(GXXT-2023-046)

Abstract

Abstract:

Dyes are widely used in various industries and are important water pollutants. In recent years, UV-based advanced oxidation technologies have attracted considerable attention in the dye wastewater treatment industry. In this study, the reaction mechanism of UV₁₈₅ combined with a periodate (PI) homogeneous advanced oxidation system for the removal of acid red G (ARG), which is a typical azo dye, was investigated. UV₁₈₅ can crack aquatic living oxidant species; UV₁₈₅ as a lamp source not only retains the advantages of UV₂₅₄, but also efficiently degrades organic pollutants in water. The experimental results showed that when the dosage of PI was 0.5 mmol∙L⁻¹ and the initial concentration of ARG was 50 mg∙L⁻¹, the removal rate of ARG in photolysis reached 98.17% in 4 min, and the reaction process was in accordance with the kinetic model of the first-stage reaction, with r²>0.990. The system maintained a high ARG removal rate under acidic and neutral conditions and significantly inhibited ARG degradation under alkaline conditions at pH values. HCO₃⁻ and Cl⁻ inhibited the system, NO₃⁻ slightly promoted the system, SO₄²⁻ had almost no effect on the reaction rate, and humic acid strongly inhibited ARG degradation. The results of free-radical trapping experiments and electron paramagnetic resonance tests showed that the active substances in the system were ·OH, IO₃·, IO₄·, and ¹O₂. The TOC results showed that the 30 min TOC removal was 67.9%, which was higher than the mineralization of both hydrogen peroxide (H₂O₂) and persulfate (PDS) at the same concentration of conventional oxidants combined with photolysis alone and UV₁₈₅. Based on UV-visible spectral analysis, it was initially deduced that ARG degradation occurred mainly through azo bond breaking and naphthalene ring opening. Based on the experimental results of liquid chromatography-mass spectrometry (LC-MS), possible transformation pathways of ARG in the degradation process of the VUV/PI advanced oxidation system were proposed.

Key words: periodate, acid red G, UV₁₈₅, homogeneous advanced oxidation, free radicals, azo-bond

摘要：

染料广泛用于各种行业，是水污染物的重要组成部分。近些年来基于紫外的高级氧化技术在染料废水处理行业引起了广泛的关注。该文研究了UV₁₈₅联合高碘酸盐（PI）均相高级氧化体系去除典型偶氮染料酸性红G（ARG）的反应机理。UV₁₈₅可以裂解水产生活性氧化物种，以UV₁₈₅为灯源既保留了UV₂₅₄的优势，又可以高效降解水中有机污染物。试验结果表明：当PI的投加量为0.5 mmol·L⁻¹，ARG初始质量浓度为50 mg·L⁻¹时，光解4 min时ARG去除率可达98.17%，反应过程符合一级反应动力学模型（r²>0.990）。pH在酸性和中性条件下，体系对ARG仍保持着较高的去除率，pH在碱性条件下，该体系对ARG的降解有着显著的抑制作用。HCO₃⁻和Cl⁻对体系会产生抑制作用，NO₃⁻对体系产生轻微的促进，而SO₄²⁻对反应速率几乎无影响，腐殖酸对ARG降解抑制相对较强。自由基捕获实验和电子顺磁共振测试结果表明，该体系中的活性物质为·OH、IO₃、IO₄·和¹O₂。TOC结果表明，30 min TOC去除率为67.9%，高于单纯的光解和UV₁₈₅联合相同浓度下的传统氧化剂过氧化氢（H₂O₂）和过硫酸盐（PDS）的矿化率。根据紫外可见光谱分析，初步推断ARG降解主要通过偶氮键断裂、萘环开环。依据液相色谱-质谱联用仪实验结果提出了ARG在VUV/PI高级氧化体系降解过程中的可能转化途径。

关键词: 高碘酸盐, 酸性红G, UV₁₈₅, 均相高级氧化, 自由基, 偶氮键

CLC Number:

X703

ZHU Xiansheng, TANG Yuchao, WU Changnian, HUANG Xianhuai, WANG Kun. Efficient Degradation of Organic Dye Acid Red G by UV₁₈₅ Combined with Periodate[J]. Ecology and Environment, 2025, 34(1): 108-117.

朱先胜, 唐玉朝, 伍昌年, 黄显怀, 王坤. UV₁₈₅联合高碘酸盐高效降解有机染料酸性红G[J]. 生态环境学报, 2025, 34(1): 108-117.

Figures/Tables 9

Figure 1 Effect of different systems on ARG degradation and first-order kinetics fitting

Figure 2 Effect of different PI concentrations on ARG degradation

Figure 3 Effect of different pH values on ARG degradation and first-order kinetics fit

Figure 4 Fitting of different ARG initial mass concentrations on their degradation and first-order kinetics

Figure 5 Effect of free radical scavengers on ARG degradation and EPR detection

Table 1 Effect of coexisting inorganic anions in water and HA on ARG degradation in VUV/PI system

共存物质	c/(mmol∙L⁻¹)	ARG降解率/%	k_obs/min⁻¹	r²
Cl⁻	10	96.07	0.8102	0.998
	20	94.39	0.7309	0.999
	30	91.71	0.6264	0.996
HCO₃⁻	10	91.43	0.6182	0.997
	20	88.48	0.5424	0.996
	30	85.25	0.4735	0.995
NO₃⁻	10	98.6	1.1066	0.997
	20	98.74	1.1361	0.996
	30	99.02	1.2011	0.997
SO₄²⁻	10	97.61	0.990	0.992
	20	97.47	0.9607	0.994
	30	97.33	0.9474	0.994
HA	10	83.22	0.4936	0.995
	20	75.66	0.4123	0.996
	30	69.12	0.3752	0.999
Blank	‒	98.17	1.0369	0.998

Figure 6 UV-vis absorptive spectroscopy of the ARG degradation process

Figure 7 Analysis of ARG degradation products

Figure 8 TOC changes during ARG degradation

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