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

YUAN Jian; QIAN Ya-jie; XUE Gang; ZHANG Quan; LI Qian; LIU Zi-hao; LI Xian-ying

doi:10.13205/j.hjgc.202002007

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

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

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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

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.
- magnetic biochar,
- cadiumion,
- leadion,
- adsorption,
- water treatment

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