Photochemical transformation of dimethyl phthalate (DMP) with N(iii)(H2ONO+/HONO/NO2−) in the atmospheric aqueous environment,Photochemical & Photobiological Sciences

当前位置： X-MOL 学术 › Photochem. Photobiol. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Photochemical transformation of dimethyl phthalate (DMP) with N(iii)(H2ONO+/HONO/NO2−) in the atmospheric aqueous environment
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2018-01-15 00:00:00 , DOI: 10.1039/c7pp00283a
Yu Lei _{1,

2,

3,

4} , Chengzhu Zhu _{1,

2,

3,

4} , Jun Lu _{2,

3,

4,

5} , Rong Chen _{1,

2,

3,

4} , Jun Xiao _{1,

2,

3,

4} , Shuchuan Peng _{1,

2,

3,

4}

Affiliation

The photochemical transformation of dimethyl phthalate (DMP) with N(III)(NO₂⁻/HONO/H₂ONO⁺) was investigated using 365 nm steady-state irradiation and 355 nm laser flash photolysis (LFP) techniques. The results showed that N(III) concentration, DMP initial concentration and pH values all strongly affected the oxidation efficiency of DMP. The primary step of the reaction was the attack of ˙OH radicals on the aromatic ring to form a DMP–OH adduct, and the bimolecular rate constant was determined to be (5.5 ± 0.4) × 10⁹ M⁻¹ s⁻¹. The DMP–OH adduct not only underwent monomolecular self-decay with a rate constant of (1.6 ± 0.3) × 10⁴ s⁻¹ but also interacted with HONO, H₂ONO⁺ and O₂ with rate constants of (6.4 ± 0.4) × 10⁶ M⁻¹ s⁻¹, (8.8 ± 0.5) × 10⁶ M⁻¹ s⁻¹ and (1.6 ± 0.1) × 10⁸ M⁻¹ s⁻¹, respectively. Major transformation products including methyl salicylate, monomethyl phthalate, dimethyl 4-hydroxyphthalate and dimethyl 4-nitrophthalate were identified by GC-MS and characteristics of these secondary contaminants required extra attention.

中文翻译：

邻苯二甲酸二甲酯（DMP）与N（光化学转化III）（H ₂ ONO ⁺ / HONO / NO ₂^-在大气含水环境）

邻苯二甲酸二甲酯（DMP）与N（光化学转化III）（NO ₂^- / HONO / H ₂ ONO ⁺），使用365nm的稳态辐照和355nm的激光闪光光解（LFP）技术进行了研究。结果表明，N（III）浓度，DMP初始浓度和pH值均强烈影响DMP的氧化效率。反应的第一步是˙OH自由基攻击芳环形成DMP-OH加合物，双分子速率常数确定为（5.5±0.4）×10 ⁹ M ^-1 s ^-1。DMP-OH加合物不仅经历单分子自衰减，速率常数为（1.6±0.3）×10 ⁴ s ^-1，而且还与HONO，H ₂ ONO ⁺和O ₂相互作用，速率常数为（6.4±0.4） ×10 ⁶ M ^-1 s ^-1，（8.8±0.5）×10 ⁶ M ^-1 s ^-1和（1.6±0.1）×10 ⁸ M ^-1 s ^-1，分别。通过GC-MS鉴定了主要的转化产物，包括水杨酸甲酯，邻苯二甲酸单甲酯，4-羟基邻苯二甲酸二甲酯和4-硝基邻苯二甲酸二甲酯，这些次要污染物的特性需要特别注意。

更新日期：2018-01-15

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11