标题: Removal of elemental mercury from flue gas using the magnetic attapulgite by Mn-Cu oxides modification

作者: Long, YF (Long, Yifei); He, Z (He, Zhong); Li, XY (Li, Xiaoyi); Yin, YJ (Yin, Yajie); Wang, Y (Wang, Yuan); Li, HH (Li, Honghu); Hu, JJ (Hu, Jiangjun)

来源出版物: ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH DOI: 10.1007/s11356-021-16777-z

摘要: Mercury pollution has become one of the most concerned environmental issues in the world because of its high toxicity, non-degradability, and bioaccumulation. Attapulgite adsorbents modified by magnetic manganese-copper (MnxCuy-MATP) were fabricated by co-precipitation and ultrasonic impregnation method, aiming at removing Hg-0 from coal-fired flue gas. BET, SEM, XRD, VSM, and XPS were used to systematically explore the physical and chemical properties of the adsorbents, the effects of manganese and copper additions, reaction temperature, and various components in the flue gas on the efficiency of Hg-0 removal were investigated. Mn8Cu5-MATP exhibited the optimal properties, and excessive copper loadings led to the aggregation of the active components. The efficiency of mercury removal can be effectively improved by NO and HCl regardless of the absence and presence of O-2, because the NO+, NO3, NO2, and Cl* produced during the reaction can promote the adsorption and oxidation of Hg-0. SO2 and H2O inhibited the oxidation of Hg-0 because of the competitive adsorption at the active sites, while a large amount of sulfite and sulfate were formed to block the pores. However, the introduction of copper caused the sample to obtain SO2 resistance, which resulted in a mercury removal efficiency of 84.3% even under 1500 ppm SO2. In addition, after 5 cycles of adsorption and regeneration, Mn8Cu5-MATP can still maintain excellent Hg-0 removal ability. The fabricated adsorbent can save the actual production cost and effectively improve the mercury removal efficiency in sulfur-containing flue gas.

作者关键词: Mercury; Attapulgite; Manganese; Copper; Coal-fired flue gas

地址: [Long, Yifei; He, Zhong; Li, Xiaoyi; Yin, Yajie; Wang, Yuan; Li, Honghu; Hu, Jiangjun] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, Peoples R China.

通讯作者地址: Hu, JJ (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, Peoples R China.

电子邮件地址: jjhu1963@outlook.com

影响因子：4.223