INFLUENCE OF MAGNETIC BIOCHAR PREPARATION METHODS ON ADSORPTION CHARACTERISTICS OF Pb<sup>2+</sup> IN WASTEWATER

SHEN Ling-fang; DONG Jun; SHAN Sheng-dao; SHU Wan-jun

doi:10.13205/j.hjgc.202109008

Volume 39 Issue 9

Jan. 2022

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SHEN Ling-fang, DONG Jun, SHAN Sheng-dao, SHU Wan-jun. INFLUENCE OF MAGNETIC BIOCHAR PREPARATION METHODS ON ADSORPTION CHARACTERISTICS OF Pb2+ IN WASTEWATER[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(9): 48-55. doi: 10.13205/j.hjgc.202109008

Citation:

SHEN Ling-fang, DONG Jun, SHAN Sheng-dao, SHU Wan-jun. INFLUENCE OF MAGNETIC BIOCHAR PREPARATION METHODS ON ADSORPTION CHARACTERISTICS OF Pb²⁺ IN WASTEWATER[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(9): 48-55. doi: 10.13205/j.hjgc.202109008

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INFLUENCE OF MAGNETIC BIOCHAR PREPARATION METHODS ON ADSORPTION CHARACTERISTICS OF Pb²⁺ IN WASTEWATER

doi: 10.13205/j.hjgc.202109008

1. Key Laboratory of Recycling and Eco-Treatment of Waste Biomass of Zhejiang Province, Zhejiang University of Science and Technology, Hangzhou 310023, China;
2. Institute of Energy and Chemical Engineering, Zhejiang Energy R&D, Hangzhou 311121, China

Received Date: 2020-12-22
Available Online: 2022-01-21

Abstract

Abstract

In order to prepare environmental-friendly adsorption materials with magnetic separation and excellent adsorption properties, the effect of different preparation methods on the adsorption properties of biochar was investigated. Fir wood (FW) pruned from deforestation residues was used as the feedstock. The original biochar FWBC was obtained by pyrolysis of FW at high temperature. Magnetic biochars FWFe(2) and FWFe(3) were prepared by two methods:precipitation and impregnation. The biochar was characterized by elemental analysis, magnetic analysis, SEM-EDS, XRD and FTIR. The adsorption characteristics of FWFe(2) and FWFe(3) for Pb²⁺in water were studied. The adsorption mechanisms of different biochars were discussed. The results showed that the magnetized biochars contained Fe₃O₄ particles. The saturation magnetization of FWFe (2) and FWFe (3) were 35.59 and 27.76 emu/g, respectively, which indicated good magnetic separation capability for all kinds of biochars. The Pb²⁺adsorption characteristics by FWFe (2) and FWFe (3) were more in line with the pseudo second order kinetics and Langmuir isotherm model, which indicated that the adsorption was mainly chemical adsorption. The adsorption performance of the magnetized FWFe(2) was significantly better than that of FWFe(3) and the original biochar. The equilibrium adsorption capacity was 817.64 mg/g, which was 12 times of that of FWBC. Magnetization by precipitation method could effectively improve the adsorption of Pb²⁺. The adsorption mechanism mainly included ion exchange and metal (hydrogen) carbonate coprecipitation, physical adsorption and complexation with surface functional groups. The results were helpful to promote the utilization of agricultural and forestry waste biomass and the practical application of magnetic biochar in environment.
- magnetic biochar,
- preparation methods,
- Pb²⁺,
- adsorption,
- mechanisms

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References(33)

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