生物炭悬浮液中羟基自由基生成的机理：对邻苯二甲酸二乙酯降解的影响。
Mechanism of hydroxyl radical generation from biochar suspensions: Implications to diethyl phthalate degradation.
机构信息
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China.
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; School of Resources and Environment, Anhui Agricultural University, Hefei 230036, PR China.
出版信息
Bioresour Technol. 2015 Jan;176:210-7. doi: 10.1016/j.biortech.2014.11.032. Epub 2014 Nov 15.
This paper investigated hydroxyl radical (OH) generation from biochar suspensions for diethyl phthalate (DEP) degradation in the presence of oxygen. Electron paramagnetic resonance (EPR) coupled with a salicylic acid trapping method were used to detect free radicals in biochar and verify OH generation from biochar suspensions. Free radicals (FRs) in biochar could induce OH generation, and ≈12 spins of FRs were consumed to produce one trapped [OH] molecule. The proposed mechanism of OH generation was that FRs in biochar transferred electrons to O2 to produce the superoxide radical anion and hydrogen peroxide, which reacted further with FRs to produce OH. Free radical-quenching studies utilizing superoxide dismutase, catalase, and deferoxamine as scavengers were used to testify this mechanism. Furthermore, OH generated from biochar suspensions could degrade DEP efficiently. These findings of this study provide new insights into the physicochemical properties and environmental implications of biochar.
本文研究了在有氧存在的情况下，生物炭悬液中羟基自由基（OH）的生成，以降解邻苯二甲酸二乙酯（DEP）。电子顺磁共振（EPR）与水杨酸捕获法结合，用于检测生物炭中的自由基，并验证生物炭悬液中 OH 的生成。生物炭中的自由基（FRs）可以诱导 OH 的生成，并且产生一个被捕获的 [OH] 分子需要消耗约 12 个 FRs。OH 生成的提出机制是 FRs 将电子转移给 O2 以产生超氧自由基阴离子和过氧化氢，然后它们与 FRs 进一步反应生成 OH。利用超氧化物歧化酶、过氧化氢酶和去铁胺作为清除剂的自由基猝灭研究用于验证这一机制。此外，生物炭悬液中产生的 OH 可以有效地降解 DEP。本研究的这些发现为生物炭的物理化学性质和环境影响提供了新的见解。
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