化工进展 ›› 2020, Vol. 39 ›› Issue (10): 4268-4274.DOI: 10.16085/j.issn.1000-6613.2019-2013

• 资源与环境化工 • 上一篇    下一篇

生物炭/过一硫酸盐体系同时去除Cu2+和对硝基苯胺

孙鹏1,2(), 张凯凯1, 张玉1, 张延荣1()   

  1. 1.华中科技大学环境科学与工程学院,湖北 武汉 430074
    2.内蒙古科技大学能源与环境学院,内蒙古 包头 014010
  • 出版日期:2020-10-05 发布日期:2020-10-09
  • 通讯作者: 张延荣
  • 作者简介:孙鹏(1980—),男,博士研究生,研究方向为生物炭修复水体和土壤污染。E-mail:sp_five666@163.com
  • 基金资助:
    中国国际科技合作项目(2016YFE0126300)

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

Peng SUN1,2(), Kaikai ZHANG1, Yu ZHANG1, Yanrong ZHANG1()   

  1. 1.Environmental Science Research Institute, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
    2.Institute of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
  • Online:2020-10-05 Published:2020-10-09
  • Contact: Yanrong ZHANG

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SO4·-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 SO4·- 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

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