标题: UV<sub>254</sub> triggers chloroacetic acids degradation to generate degrading products for<i> Chlorella</i><i> sorokiniana</i> growth: Mechanism and performance evaluation
作者: Wang, W (Wang, Wei); Wu, QR (Wu, Qirui); Wang, HZ (Wang, Hanzhi); Qv, M (Qv, Mingxiang); Dai, D (Dai, Dian); He, XM (He, Xiaoman); Pozdnyakov, IP (Pozdnyakov, Ivan P.); Huang, LZ (Huang, Li-Zhi); Zhu, LD (Zhu, Liandong)
来源出版物: JOURNAL OF HAZARDOUS MATERIALS 卷: 497 文献号: 139575 DOI: 10.1016/j.jhazmat.2025.139575 Early Access Date: AUG 2025 Published Date: 2025 OCT 5
摘要: This study investigated the UV254 irradiation degradation of chloroacetic acids (CAAs), specifically monochloroacetic acid (MCAA), dichloroacetic acid (DCAA), and trichloroacetic acid (TCAA), and evaluated the ecological impact of their degradation products on Chlorella sorokiniana (CS). The degradation followed firstorder kinetics, with dechlorination efficiencies of 91.2 % for MCAA, 92.9 % for DCAA, and 92.4 % for TCAA. TCAA was degraded fastest due to its higher chlorine content. Initial pH (3-10) had minimal influence, whereas lower concentrations (0.25 mM) led to slower degradation. Hydroxyl radicals (center dot OH) were identified as the dominant reactive species via electron paramagnetic resonance analysis. Dechlorination generated Cl- and HCl, resulting in acidification and increased toxicity. Total organic carbon (TOC) analysis indicated nearly complete mineralization. Untreated CAAs significantly inhibited microalgal growth and photosynthesis, while postdegradation pH adjustment (to pH > 4) mitigated toxicity and enabled microalgal assimilation, with CS culture pH further increasing to 9-10, thereby facilitating self-buffered bioremediation. These findings confirm the effectiveness of UV254 degradation on CAAs and provide valuable guidance for ecological safety in aquatic ecosystem management.
作者关键词: UV( 254 )degradation; Chloroacetic acids; Chlorella sorokiniana; pH effects; Ecological risks
KeyWords Plus: WASTE-WATER; BIODIESEL PRODUCTION; BY-PRODUCTS; TOXICITY; REMOVAL; PH
地址: [Wang, Wei; Wu, Qirui; Wang, Hanzhi; Qv, Mingxiang; Dai, Dian; He, Xiaoman; Zhu, Liandong] Wuhan Univ, Sch Resource & Environm Sci, Hubei Key Lab Biomass Resources Chem & Environm Bi, Wuhan 430079, Peoples R China.
[Wang, Wei; Wu, Qirui; Wang, Hanzhi; Qv, Mingxiang; Dai, Dian; He, Xiaoman; Zhu, Liandong] Wuhan Univ, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430079, Peoples R China.
[Zhu, Liandong] Wuhan Univ, Natl Inst Dev Strategy, Wuhan 430072, Peoples R China.
[Huang, Li-Zhi] Wuhan Univ, Sch Civil Engn, 8 East Lake South Rd, Wuhan 430079, Peoples R China.
[Pozdnyakov, Ivan P.] VV Voevodsky Inst Chem Kinet & Combust, 3 Inst Skaya Str, Novosibirsk 630090, Russia.
通讯作者地址: Zhu, LD (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Key Lab Biomass Resources Chem & Environm Bi, Wuhan 430079, Peoples R China.
Zhu, LD (通讯作者)，Wuhan Univ, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430079, Peoples R China.
Huang, LZ (通讯作者)，Wuhan Univ, Sch Civil Engn, 8 East Lake South Rd, Wuhan 430079, Peoples R China.
电子邮件地址: [email protected]; [email protected]
影响因子：11.3
