生物炭/过一硫酸盐体系同时去除Cu2+和对硝基苯胺

doi:10.16085/j.issn.1000-6613.2019-2013

摘要/Abstract

摘要：

目前，重金属离子和有机污染物共存的废水处理是一个世界性的重大问题，对环境保护具有重要的意义。本研究以农业废弃物向日葵秸秆为原料，制备了一种生物炭（BC），用以活化过一硫酸盐（PMS）。BC/PMS体系实现了对水中重金属Cu²⁺和有机污染物对硝基苯胺（PNA）的同时去除。探究了pH、BC投加量和PMS浓度等反应条件对同时去除Cu²⁺和PNA的影响。研究表明，在BC=2.0g/L、PMS=1.0mmol/L、PNA=20.0mg/L、Cu²⁺=2.0mg/L和pH=3.0条件下，60min时Cu²⁺和PNA同时去除效率分别为90.00%和100.00%；Cu²⁺被BC/PMS体系吸附去除的同时也显著地促进了PNA的降解去除。自由基猝灭实验和电子顺磁共振光谱（EPR）实验表明，BC/PMS/Cu²⁺/PNA体系降解PNA为自由基反应和非自由基反应共存过程，且以非自由基反应为主导；自由基反应是基于Cu²⁺活化PMS产生SO $4 · -$ 和?OH，非自由基反应可归因于BC活化PMS产生活性物种¹O₂。

关键词: 生物炭, 过一硫酸盐, 同时去除, 铜离子, 对硝基苯胺

Abstract:

Nowadays, clean-up of wastewaters with the coexistence of heavy metal ions and organic pollutants is a huge issue worldwide. A sunflower straw-based biochar (BC) was prepared and the simultaneous removal of Cu²⁺ and p-nitroaniline (PNA) in aqueous solutions by BC/peroxymonosulfate (PMS) system was achieved. The effects of reaction conditions such as pH, BC dosage and PMS concentration on simultaneous removal of Cu²⁺ and PNA were investigated. The results demonstrated that the simultaneous removal efficiency of Cu²⁺ and PNA reached 90.00% and 100.00%, respectively, with BC of 2.0g/L, PMS of 1.0 mmol/L, PNA of 20.0mg/L , Cu²⁺ of 2.0mg/L, initial pH of 3.0 and reaction time of 60min. Cu²⁺ was adsorbed and removed by BC/PMS system, which also promoted the degradation efficiency of PNA. Free radical quenching experiments and EPR studies indicated that free radical reaction and non-radical reaction were involved in the BC/PMS/Cu²⁺/PNA system, and the non-radical reaction were the main process for the PNA degradation. The free radical reaction was based on the activation of PMS by Cu²⁺ to produce SO $4 · -$ and ?OH. The non-free radical reaction was due to the activation of PMS by BC to generate ¹O₂.

Key words: biochar, peroxymonosulfate, simultaneous removal, Cu²⁺, p-nitroaniline

中图分类号:

X703.1

孙鹏, 张凯凯, 张玉, 张延荣. 生物炭/过一硫酸盐体系同时去除Cu²⁺和对硝基苯胺[J]. 化工进展, 2020, 39(10): 4268-4274.

Peng SUN, Kaikai ZHANG, Yu ZHANG, Yanrong ZHANG. Simultaneous removal of Cu²⁺ and p-nitroaniline from aqueous solution by biochar/peroxymonosulfate system[J]. Chemical Industry and Engineering Progress, 2020, 39(10): 4268-4274.

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生物炭/过一硫酸盐体系同时去除Cu²⁺和对硝基苯胺

Simultaneous removal of Cu²⁺ and p-nitroaniline from aqueous solution by biochar/peroxymonosulfate system

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