应用化学 ›› 2024, Vol. 41 ›› Issue (2): 279-296.DOI: 10.19894/j.issn.1000-0518.230317
刘思蓓1, 梅竣乔1, 谢谨裕2, 刘轶君1, 邓凤霞1(), 邱珊1()
收稿日期:
2023-10-12
接受日期:
2023-12-29
出版日期:
2024-02-01
发布日期:
2024-03-05
通讯作者:
邓凤霞,邱珊
基金资助:
Si-Bei LIU1, Jun-Qiao MEI1, Jin-Yu XIE2, Yi-Jun LIU1, Feng-Xia DENG1(), Shan QIU1()
Received:
2023-10-12
Accepted:
2023-12-29
Published:
2024-02-01
Online:
2024-03-05
Contact:
Feng-Xia DENG,Shan QIU
About author:
qiushan@hit.edu.cn;Supported by:
摘要:
为了提高传统污水处理技术对布洛芬这一新型污染物的去除效率,本研究构建了一种基于活性炭强化的泡沫钛空气扩散电极(AC@Ti-F GDE)的电过臭氧处理体系。 该体系通过增强传统电过臭氧体系的氧化效能,用于布洛芬的去除。 结果表明,相对于传统的电极(Ti-F),微孔泡沫钛空气扩散电极(Ti-F GDE)体系中的HO?相对含量提升了155.7%。 在投加活性炭后,AC@Ti-F GDE体系中的HO?相对含量在Ti-F GDE体系的基础上进一步提升了35.4%。 这种显著提升的HO?产量得益于AC@Ti-F GDE体系中H2O2的增加,从而进一步强化了电过臭氧的氧化效能。 通过精确调控活性炭的投加密度和颗粒粒径,确定了AC@Ti-F GDE电过臭氧体系中最佳的活性炭投加密度为0.8 mg/cm3,最佳颗粒粒径为850 μm。 在此基础上,将AC@Ti-F GDE电过臭氧体系应用于布洛芬污染物的处理,通过对比不同因素下该体系降解布洛芬的程度,得到最佳运行条件: pH值为7.00,电流为150 mA,O3,gas浓度为52.2 mg/L,并采用液相质谱检测布洛芬降解过程中中间产物,得出了该体系的降解矿化机理: 布洛芬首先通过羟基化、去甲基化和脱羧等反应逐步氧化支链,随后攻击苯环并开环生成脂肪酸,最终被进一步矿化生成CO2和H2O。 AC@Ti-F GDE电过臭氧新体系,强化了传统电过臭氧体系氧化效能,为后续电过臭氧处理布洛芬提供新思路。
中图分类号:
刘思蓓, 梅竣乔, 谢谨裕, 刘轶君, 邓凤霞, 邱珊. 活性炭强化泡沫钛基空气扩散电极电过臭氧氧化及降解布洛芬效能[J]. 应用化学, 2024, 41(2): 279-296.
Si-Bei LIU, Jun-Qiao MEI, Jin-Yu XIE, Yi-Jun LIU, Feng-Xia DENG, Shan QIU. Activated Carbon Boosted Performance of a Titanium-Based Air Diffusion Electrode in Electro-Peroxone Oxidation and Ibuprofen Degradation[J]. Chinese Journal of Applied Chemistry, 2024, 41(2): 279-296.
Region | Sampling date | ρ/(mg·L-1) | Ref. |
---|---|---|---|
Taihu basin (China) | December 2020-May 2021 | 2.6 | [ |
Pearl river basin (China) | January 2017 | 1.4 | [ |
Llobregat river basin (Spain) | - | 1.4 | [ |
Umgeni river basin (South Africa) | January 2015-July 2016 | 17.6 | [ |
表1 不同污水处理厂进水中布洛芬检出最高质量浓度
Table 1 The highest mass concentration of ibuprofen detected in influent of different sewage treatment plants
Region | Sampling date | ρ/(mg·L-1) | Ref. |
---|---|---|---|
Taihu basin (China) | December 2020-May 2021 | 2.6 | [ |
Pearl river basin (China) | January 2017 | 1.4 | [ |
Llobregat river basin (Spain) | - | 1.4 | [ |
Umgeni river basin (South Africa) | January 2015-July 2016 | 17.6 | [ |
图2 不同体系HO?相对含量(A)、 O3,liquid浓度(B) 和H2O2的积累量 (C)。反应在电流为50 mA,活性炭粒径为850 μm,投加密度为0.8 mg/cm3,Na2SO4溶液浓度为50 mmol/L,pH值为7,O3,gas质量浓度为16.5 mg/L,曝气流量为50 mL/min,反应时间为15 min的条件下进行
Fig.2 Relative content of HO? (A), concentration of O3,liquid (B) and accumulation of H2O2 (C) in different systems. The reaction was carried out under the conditions of current of 50 mA, activated carbon particle size of 850 μm, dosage of 0.8 mg/cm3, Na2SO4 solution concentration of 50 mmol/L, pH of 7, O3,gas mass concentration of 16.5 mg/L, aeration flow rate of 50 mL/min and reaction time of 15 min
图3 活性炭投加密度为0、0.8、8.3和12.4 mg/cm3对HO?相对含量影响No current application; d(GAC)=850 μm; c(Na2SO4)=50 mmol/L; pH=7; Reration flow rate=50 mL/min;O3,gas=15 mg/L; reaction time=15 min
Fig.3 Effect of activated carbon dosage density of 0, 0.8,8.3 and 12.4 mg/cm3 on the relative content of HO?.
图5 不同活性炭投加密度(A)及电流(B)对H2O2的积累量影响
Fig.5 Effect of different activated carbon dosage density (A) and current (B) on the accumulation of H2O2 Reaction current:50 mA; 100 mA. Particlesize: 850 μm; c(Na2SO4)=50 mmol/L; pH=7; v(oxygen aeration)=50 mL/min; Anode: BDD, reaction time≥15 min
图6 不同粒径活性炭对H2O2积累量(A)和H2O2分解(B)的影响及其吸附等温线(C)和孔径分布图(D)
Fig.6 Effects of different particle sizes activated carbon on the accumulation (A) and decomposition (B) of H2O2, as well as their adsorption isotherms (C) and pore size distribution (D)
图7 不同粒径活性炭的RRDE图(A)及电子转移数(B)
Fig.7 Rotating ring-disk electrode (RRDE) diagram (A) and electron transfer number (B) of activated carbon with different particle sizes
图9 不同粒径活性炭的C1s分峰拟合图(A-C)、化学键占比(D)、N1s峰(E)及C—N占比与电子转移数相关性拟合(F)
Fig.9 C1s peak fitting diagrams (A-C), chemical bond proportion (D), N1s peak (E) and correlation fitting between C—N proportion and electron transfer number (F) of activated carbon with different particle sizes
No. | Molecular formula | Relative molecular mass | Chemical formula |
---|---|---|---|
A | C13H18O2 | 206 | |
B | C13H19O4 | 238 | |
C1, C2 | C13H18O3 | 221 | |
D | C11H14O3 | 193 | |
E | C12H16O | 175 | |
F | C10H12O4 | 196 | |
G | C11H14O2 | 177 | |
H | C10H11O2 | 164 | |
I | C12H16 | 160 | |
J | C9H8O2 | 147 | |
K1, K2 | C9H10O | 133 | |
L | C6H10O3 | 129 | |
M | C5H10O3 | 117 | |
N1, N2 | C4H4O4 | 116 | |
O | C3H4O3 | 87 | |
P | C2H4O2 | 59 | |
Q | C2H2O4 | 90 |
表2 LC-MS对布洛芬降解中间产物检测结果
Table 2 Determination of ibuprofen degradation intermediates by LC-MS
No. | Molecular formula | Relative molecular mass | Chemical formula |
---|---|---|---|
A | C13H18O2 | 206 | |
B | C13H19O4 | 238 | |
C1, C2 | C13H18O3 | 221 | |
D | C11H14O3 | 193 | |
E | C12H16O | 175 | |
F | C10H12O4 | 196 | |
G | C11H14O2 | 177 | |
H | C10H11O2 | 164 | |
I | C12H16 | 160 | |
J | C9H8O2 | 147 | |
K1, K2 | C9H10O | 133 | |
L | C6H10O3 | 129 | |
M | C5H10O3 | 117 | |
N1, N2 | C4H4O4 | 116 | |
O | C3H4O3 | 87 | |
P | C2H4O2 | 59 | |
Q | C2H2O4 | 90 |
图15 电流-时间模式运行7 h情况(A);反应前(B)及电解10次后(C)电极SEM图
Fig.15 Current time mode operation for 7 h (A); SEM images of electrode before reaction (B) and after 10 electrolysis cycles (C)
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