Preparation and Adsorption Properties of Boron-Nitrogen Co-Doped Biochar Materials

Abstract

Abstract: Boron-nitrogen co-doped biochar material was prepared by high temperature reaction under ammonia (NH₃) atmosphere, using kapok, boric acid (HBO₃), and urea (CO(NH₂)₂) as raw materials. The PEI-BCN material was obtained by treating boron-carbon-nitrogen (BCN) material with polyethyleneimine (PEI), and the adsorption properties of PEI-BCN material were studied. The results show that the prepared BCN material has a porous structure with an average pore size of 11.0 nm when the reaction temperature is 1 100 ℃. The adsorption property of BCN material is better than that of biochar, and after PEI modification, the adsorption property of BCN material is greatly improved. The adsorption amount of organic dye malachite green (MG)by PEI-BCN material is up to 710.0 mg/g, showing excellent adsorption property. The adsorption of PEI-BCN material is consistent with the pseudo-first-order adsorption kinetics model, and the adsorption of MG by PEI-BCN material belongs to Langmuir isothermal adsorption.

Key words: BCN material, biochar, kapok, polythyleneimine, high temperature reaction, adsorption, malachite green

CLC Number:

X703

XU Meng, GUO Yucheng, LIN Guoqiang, LI Jianbao, CHEN Yongjun, LUO Lijie. Preparation and Adsorption Properties of Boron-Nitrogen Co-Doped Biochar Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 2242-2250.

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