化工进展 ›› 2022, Vol. 41 ›› Issue (2): 981-989.DOI: 10.16085/j.issn.1000-6613.2021-0663

• 资源与环境化工 • 上一篇    下一篇

nZVI/BC与(Cu-Pd)/BC协同提高硝酸盐的去除和氮气的选择性

潘伟亮1,2(), 吴齐叶2, 曹云鹏2, 张先炳2, 古励3(), 何强3   

  1. 1.重庆交通大学环境水利工程重庆市工程实验室,重庆 400074
    2.重庆交通大学河海学院, 重庆 400074
    3.重庆大学三峡库区生态环境教育部重点实验室, 重庆 400045
  • 收稿日期:2021-03-31 修回日期:2021-05-06 出版日期:2022-02-05 发布日期:2022-02-23
  • 通讯作者: 古励
  • 作者简介:潘伟亮(1985—),男,博士,副教授,从事污水处理技术与产业化研究。E-mail:pan0316@126.com
  • 基金资助:
    重庆市科技局社会民生基金(cstc2017shmsA20011);住房和城乡建设部科学技术计划(2016-K6-025);重庆交通大学研究生科研创新基金(YC2019003)

Improvement of nitrate removal and nitrogen selectivity by the synergy of nZVI/BC and (Cu-Pd)/BC

PAN Weiliang1,2(), WU Qiye2, CAO Yunpeng2, ZHANG Xianbing2, GU Li3(), HE Qiang3   

  1. 1.Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal, Chongqing Jiaotong University, Chongqing 400074, China
    2.School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China
    3.Key laboratory of the Three Gorges Reservoir Region’s Eco-environments, Ministry of Education, Chongqing University, Chongqing 400045, China
  • Received:2021-03-31 Revised:2021-05-06 Online:2022-02-05 Published:2022-02-23
  • Contact: GU Li

摘要:

为探明纳米零价铁(nZVI)/BC与(Cu-Pd)/BC联合作用对水中硝酸盐的去除机理,分别负载纳米金属于小麦秸秆生物炭上,制得nZVI/BC与(Cu-Pd)/BC两种复合材料,并通过SEM、TEM、EDS、XRD对材料进行表征分析,从nZVI/BC的SEM中可以看出,纳米零价铁较好地分散在生物炭(BC)上面;从(Cu-Pd)/BC的TEM图中看出,纳米铜钯均有效地负载于BC上且分布均匀。结果表明,nZVI/BC:(Cu-Pd)/BC体系中硝酸盐的去除率可达100%,氮气转化率达到42%。当pH为4.05时硝酸盐去除效果最佳;硝酸盐去除率随着初始浓度的升高而降低;溶解氧的存在会降低硝酸盐去除率;存在PO43-对去除效率的影响最大,去除率降低至15.8%,而CO32-和SO42-的存在对去除氮的影响不大,去除率接近100%。动力学研究表明:在最佳条件下,nZVI/BC与(Cu-Pd)/BC联合作用对NO3--N、NO2--N的去除均符合准二级吸附动力学模型,反应过程以还原反应为主。

关键词: 硝酸盐, 氮气选择性, 纳米零价铁, 动力学, 生物炭

Abstract:

To investigate the mechanism of nitrate removal from water by the combined action of nano zero-valent iron (nZVI)/BC and (Cu-Pd)/BC, nZVI/BC and (Cu-Pd)/BC composites were produced by loading nano-metals on wheat straw biochar, and the materials were characterized by SEM, TEM, EDS, and XRD. The results showed that the nano-zero valent iron was well dispersed on the biochar (BC) and the nano-Cu-Pd was effectively loaded on the BC with uniform distribution. The nitrate removal rate of nZVI/BC: (Cu-Pd)/BC systems could reach 100% and the nitrogen conversion rate reached 42%. The best nitrate removal was achieved at pH 4.05; nitrate removal decreased with increasing initial concentration; the presence of dissolved oxygen reduced the nitrate removal; the presence of PO43- had the greatest effect on the removal efficiency and reduced the removal rate to 15.8%, while the presence of CO32- and SO42- had little effect on nitrogen removal and the removal rate was close to 100%. Kinetic studies showed that the removal of NO3--N and NO2--N by the combined action of nZVI/BC and (Cu-Pd)/BC under optimal conditions was in accordance with the quasi-secondary adsorption kinetic model, and the reaction process was dominated by the reduction reaction.

Key words: nitrate, nitrogen selectivity, nano-zero-valent iron, kinetics, biochar

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