摘要
海洋是黑碳和硝基苯类污染物的重要汇集地,本文模拟研究了海水环境下黑碳对硝基苯的降解作用,以解析黑碳对硝基苯的催化作用机制.研究发现,在海水环境中,黑碳对硝基苯有强烈的吸附作用,加入少量硫化物后,黑碳可以促使硝基苯快速还原降解.通过BET比表面积归一化的速率常数与黑碳样品的元素组成和黑碳表面官能团数量的关系,分析了黑碳作为催化剂降解还原硝基苯的主要控制因子,研究认为黑碳中残留原始有机质的增多能加速硝基苯的还原降解,硝基苯降解速率与黑碳表面官能团有关.酚羟基和羰基是黑碳作为催化剂还原降解硝基苯的重要活性点位.
Abstract
The ocean is an important gathering place for black carbon and nitrobenzene pollutants.This article studies the degradation of nitrobenzene by black carbon in seawater environment to elucidate the catalytic mechanism of black carbon on nitrobenzene.Research has found that black carbon has a strong adsorption effect on nitrobenzene in seawater environments.After adding a small amount of sulfides,black carbon can promote the rapid reduction and degradation of nitrobenzene.The relationship between the normalized rate constant of BET specific surface area and the elemental composition of black carbon samples and the number of functional groups on the surface of black carbon was analyzed.The main control factor for the degradation and reduction of nitrobenzene by black carbon as a catalyst was analyzed.The study found that the increase of residual original organic matter in black carbon can accelerate the reduction and degradation of nitrobenzene.The degradation rate of nitrobenzene is related to the surface functional groups of black carbon.Phenolic hydroxyl and carbonyl groups are important active sites for the reduction and degradation of nitrobenzene by black carbon.
基金项目
2022年河北省高等学校科学技术研究项目(ZC2022028)
NETL
NSTL
万方数据