• 综述 •
陈肖萍, 陈巧珊, 毕进红. 光催化降解土壤中多环芳烃[J]. 化学进展, 2021, 33(8): 1323-1330.
Xiaoping Chen, Qiaoshan Chen, Jinhong Bi. Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbon in Soil[J]. Progress in Chemistry, 2021, 33(8): 1323-1330.
多环芳烃(PAHs)是一类广泛分布于土壤中的持久性有机污染物,其化学结构稳定,具有高疏水性、难降解性和三致毒性,多产生于交通运输、工业生产、垃圾焚烧等人为活动中。近年来,日益严峻的PAHs污染给土壤生态、食品安全和民众健康带来严重威胁。因此,对土壤PAHs污染的治理具有重要意义且亟待解决。在众多PAHs处理技术中,光催化技术凭借能耗低、操作简便、环境友好等优势,受到了研究者们的广泛关注。本文概述了PAHs的光催化降解机理与途径,综述了光催化修复土壤PAHs领域的研究进展,讨论了不同环境因素对催化剂降解效果的影响,并总结了当前光催化技术应用于土壤PAHs污染修复所面临的挑战。
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PAH | PAH abbreviation used | Chemical structure | Molecular mass(g/mol) | Carcinogenicity[ |
---|---|---|---|---|
naphthalene | NAPH | | 128 | 0/+ |
acenaphthylene | ACNY | | 152 | 0/+ |
acenaphthene | ACN | | 154 | 0/+ |
fluorene | FLUO | | 166 | 0/+ |
phenanthrene | PHEN | | 178 | 0/+ |
anthracene | ANTH | | 178 | + |
fluoranthene | FANTH | | 202 | 0/+ |
pyrene | PYR | | 202 | + |
benzo(a)anthracene | B(a)A | | 228 | + |
chrysene | CHR | | 228 | + |
benzo(b)fluoranthene | B(b)F | | 252 | 0/+ |
benzo(k)fluoranthene | B(k)F | | 252 | 0/+ |
benzo(a)pyrene | B(a)P | | 252 | ++ |
dibenzo(ah)anthracene | DB(ah)A | | 278 | + |
benzo(g,h,i)perylene | B(ghi)P | | 276 | 0/+ |
indene(1,2,3-cd)pyrene | I(123-cd)P | | 276 | 0/+ |
Catalyst | PAHs studied | Experimental conditions | ref |
---|---|---|---|
anatase TiO2 0~4 wt% | PYR 40 mg/kg | 5 g soil, UV irradiation(253.7 nm, 119, 238, 357 μW/cm), 25 h, Distance between light source and samples 10 cm, 25 ℃, 0~40 mg/kg humic acid, 0~30 wt% H2O2 | |
rutile TiO2 0~4 wt% | PHEN, PYR 40 mg/kg | same as above | |
anatase TiO2 0.5~3 wt% | PHEN, PYR, B(a)P 40 mg/kg | 5 g soil, UV irradiation(254, 310, 365 nm, 1071 μW/cm), 120 h, Distance between light source and samples 15 cm, pH 4.2, 6.8, 9.7, 30 ℃, 0~40 mg/kg humic acid | |
anatase TiO2 0.5~3 wt% | B(a)P 40 mg/kg | same as above | |
P25 TiO2 1 wt%、10 wt%、20 wt% | ∑12 PAH 4382 ng/g | UV-A and UV-C irradiation, 24 h, pH 10.1, 18 and 30 ℃ | |
P25 TiO2 10 mg/mL | FANTH 19.4 mg/kg | 200 mg soil, Xenon lamp, Extraction of FANTH from soil with 22.5 mL cyclohexane and 7.5 mL ethanol, 6 h | |
TiO2@ZnHCF 5~25 mg | ACN, PHEN, FLUO 60~300 mg/kg | solar light(463±181 W/m), 24 h, Water to soil ratio 30∶1, pH 5~9, 32.3±3.8 ℃ | |
Fe2O3 1~7 wt% | PHEN, PYR, B(a)P 40 mg/kg | 5 g soil, UV irradiation(254 nm, 1071 μW/cm), 120 h, Distance between light source and samples 15 cm, pH 4.2, 6.8, 9.7, 30 ℃, 5~40 mg/kg humic acid | |
akaganeite nano-rods 0~10 wt% | PHEN 50 μg/g | 2 g soil, UV irradiation(254, 365, 410 nm), 120 h, pH 4.5, 7.2, 9.2, 0~5 wt% oxalic acid | |
iron oxides 0~5 wt% | B(a)P 50 μm/g | UV irradiation(254, 365, 410 nm), 120 h, pH 5.4, 6.8, 8.1, 0~40 wt% oxalic acid | |
FeHCF 5 wt% | B(a)P, PHEN, FLUO, CHR, ANTH 50~200 mg/g | 0.5 g soil, sunlight(452±183 W/m) and UV irradiation, 48 h, pH 5.1, 6.8, 8.0, 31.1 ± 1.7 ℃ | |
KZnHCF 25 mg | B(a)P, PHEN, FLUO, CHR, ANTH 50~200 mg/ | 0.5 g soil, solar light(10.04 kW/m2/day) and UV irradiation(254 nm), 48 h, pH 5.1, 6.8, 8.0 | |
MMCRC 2 wt% | PHEN 200 mg/kg | 15 g soil, Aged for a month, visible light, 10 h, Distance between light source and samples 15 cm, under 30 ℃, moisture content 60%~80% | |
g-C3N4 6 wt% | PHEN 200 mg/kg | visible light(15 g soil, under 30 ℃), solar light(250 g soil, 33~38 ℃), 10 h, moisture content about 60% | |
g-C3N4@Fe3O4 3 wt% | PHEN 200 mg/kg | 15 g soil, Aged for 6 month, visible light, 2 h, under 30 ℃, moisture content about 50% |
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