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Volume 38 Issue 2
Feb.  2020
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2020  >  38(2): 55-62
YUAN Jian, QIAN Ya-jie, XUE Gang, ZHANG Quan, LI Qian, LIU Zi-hao, LI Xian-ying. REMOVAL OF CADMIUM AND LEAD IN WATER BY MAGNETIC CARBON PREPARED FROM ACTIVATED SLUDGE WITH HYDROTHERMAL CARBONIZATION[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(2): 55-62. doi: 10.13205/j.hjgc.202002007
Citation: YUAN Jian, QIAN Ya-jie, XUE Gang, ZHANG Quan, LI Qian, LIU Zi-hao, LI Xian-ying. REMOVAL OF CADMIUM AND LEAD IN WATER BY MAGNETIC CARBON PREPARED FROM ACTIVATED SLUDGE WITH HYDROTHERMAL CARBONIZATION[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(2): 55-62. doi: 10.13205/j.hjgc.202002007
shu

REMOVAL OF CADMIUM AND LEAD IN WATER BY MAGNETIC CARBON PREPARED FROM ACTIVATED SLUDGE WITH HYDROTHERMAL CARBONIZATION

doi: 10.13205/j.hjgc.202002007

  • College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China

  • Received Date: 2018-12-12
    Abstract
  • Magnetic biochar (Fe-SSBC) was prepared from activated sludge containing ferrous sulfate by hydrothermal carbonization at 220℃ for 4 h, achieving sludge reduction at the same time. Using Cd2+ and Pb2+ as the model pollutants, the effect of the Fe-SSBC dosage and the initial pH on the adsorption of Cd2+ and Pb2+ were studied, then the adsorption mechanism was investigated by adsorption kinetics and adsorption isotherm experiments. The samples were characterized by elemental analysis (EA), X ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), specific surface area (BET), X ray photoelectron spectroscopy (XPS) and hysteresis loop. The results showed that optimal condition for the best Cd2+ adsorption by Fe-SSBC was dosage of 0.2 g under pH=5, after 10 h, and the removal rate was close to 100%; while that for Pb2+ adsorption was dosage of 0.3 g under pH=6, after 8.5 h, and the removal rate was close to 100%. The adsorption kinetics of Cd2+ and Pb2+ by Fe-SSBC fitted the second-order kinetic model. The adsorption isotherm model of Langmuir could better fit the monolayer adsorption of Cd2+ and Pb2+ on Fe-SSBC. Chemisorption controlled the rate of adsorption process, and there was physical adsorption at the same time. In this study, sludge reduction was achieved by hydrothermal carbonization, meanwhile, a adsorbent was prepared to remove Cd2+ and Pb2+ effectively from water.
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