Adsorption of Cr 6+ on Polyethyleneimine-functionalized Straw Biochar from Aqueous Solution †

doi:10.7503/cjcu20190418

Abstract

Abstract:

To study the properties of straw biochar composites and the adsorption characteristics of Cr ⁶⁺ from water, corn stalks were selected as raw material and corn stalk biochar was prepared by anoxic carbonization and loaded on the surface of biochar with polyethyleneimine(PEI). PEI-functionalized straw biochar was prepared, and its adsorption performance and the mechanism of Cr ⁶⁺adsorption were characterized. The results showed that the adsorption efficiency of PEI alkaline biochar(PBC) on Cr ⁶⁺ was significantly higher than that of PEI acidic biochar(HBC) and raw biochar(CBC) under the same conditions of adsorbent addition. The maximum adsorption capacity of Cr ⁶⁺ on PBC from aqueous solution was 386.3 mg/g, and the adsorption equilibrium time was 300 min. When the pH was approximately 2.0, the adsorption efficiency of Cr ⁶⁺ reached 95.94%. Therefore, PBC can be used as an adsorbent for the efficient removal of Cr ⁶⁺ in water.

Key words: Corn stalk, Biochar, Polyethyleneimine, Cr ⁶⁺, Adsorption

CLC Number:

O647

TrendMD:

XU Jianling,ZHANG Di,NIE Miaoqing,WANG Hanxi,LI Longwei. Adsorption of Cr ⁶⁺ on Polyethyleneimine-functionalized Straw Biochar from Aqueous Solution ^†[J]. Chem. J. Chinese Universities, 2020, 41(1): 155.

Figures/Tables 11

References 12

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Biochar	BET Surface area/(m²·g^-1)	Micropore area/(m²·g^-1)	Micropore volume/(cm³·g^-1)	Mesoporous area/(m²·g^-1)	Mesoporous volume/(cm³·g^-1)	Average aperture/nm
CBC	1.3047	1.3425	0.728×10^-3	—	—	0.4103
PBC	1.4934	0.0499	0.017 ×10^-3	2.4137	0.1249×10^-2	0.4324

Biochar	BET Surface area/(m²·g^-1)	Micropore area/(m²·g^-1)	Micropore volume/(cm³·g^-1)	Mesoporous area/(m²·g^-1)	Mesoporous volume/(cm³·g^-1)	Average aperture/nm
CBC	1.3047	1.3425	0.728×10^-3	—	—	0.4103
PBC	1.4934	0.0499	0.017 ×10^-3	2.4137	0.1249×10^-2	0.4324

Biochar	First-order kinetic equation			Second-order kinetic equation
Biochar	q_e/(mg·g^-1)	k₁/min^-1	R²	q_e/(mg·g^-1)	k₂/(g·mg^-1·min^-1)	R²
CBC	22.34	0.0191	0.997	22.99	0.0044	0.966
PBC	13.49	0.0233	0.984	40.16	0.0014	0.999

Biochar	First-order kinetic equation			Second-order kinetic equation
Biochar	q_e/(mg·g^-1)	k₁/min^-1	R²	q_e/(mg·g^-1)	k₂/(g·mg^-1·min^-1)	R²
CBC	22.34	0.0191	0.997	22.99	0.0044	0.966
PBC	13.49	0.0233	0.984	40.16	0.0014	0.999

Biochar	T/K	Langmuir			Freundlich
Biochar	T/K	q_m/(mg·g^-1)	k_L/(L·mg^-1)	R²	k_F	1/n	R²
CBC	288	189.6	0.0009	0.991	0.588	0.738	0.986
	303	298.1	0.0005	0.990	0.380	0.813	0.989
	313	180.4	0.0014	0.990	1.186	0.661	0.982
PBC	288	386.3	0.0007	0.979	1.080	0.735	0.986
	303	288.6	0.0021	0.979	3.695	0.590	0.970
	313	268.4	0.0033	0.980	6.601	0.514	0.965

Adsorption of Cr ⁶⁺ on Polyethyleneimine-functionalized Straw Biochar from Aqueous Solution ^†

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