Study on the Adsorption of Heavy Metal Nickel by Biochar Prepared from Three Kinds of Bran

doi:10.11924/j.issn.1000-6850.casb2023-0228

Abstract

Abstract:

In order to explore the treatment of heavy metal nickel and the excessive waste of bran resources, this study used Pleurotus eryngii mushroom bran, agaricus mushroom bran and shiitake mushroom bran as raw materials to prepare biochar (PEBC, PGBC and LEBC), and scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and surface area measurement (BET) were applied to characterize their structure. Zeta potential was determined to explore the adsorption mechanism, and the adsorption effect of three kinds of bran biochar on nickel was compared by adsorption experiments. The results showed that all three kinds of bran biochar had irregular pores and more mineral crystals attached to the surface. In general, PEBC had the best adsorption effect with a removal rate of more than 99% and the maximum equilibrium adsorption capacity reaching 122.89 mg/g. In this study, waste bran was used to explore the treatment of heavy metal nickel, which proved that it had a broad application prospect in the treatment of heavy metal nickel in water pollution based on the resource utilization of bran.

Key words: bran, biochar, nickel ion, adsorption

CHEN Hongsen, HONG Ciqing, MO Wenjing, CAI Xinkai, GUI Fangze, GUAN Xiong, PAN Xiaohong. Study on the Adsorption of Heavy Metal Nickel by Biochar Prepared from Three Kinds of Bran[J]. Chinese Agricultural Science Bulletin, 2023, 39(32): 40-46.

Figures/Tables 10

References 27

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吸附剂	比表面积/(m²/g)	总孔容/(cm³/g)	平均孔径/nm
PEBC	44.8809	0.09375	8.3556
PGBC	110.3241	0.08201	2.9737
LEBC	9.3259	0.04371	18.7516

吸附剂	比表面积/(m²/g)	总孔容/(cm³/g)	平均孔径/nm
PEBC	44.8809	0.09375	8.3556
PGBC	110.3241	0.08201	2.9737
LEBC	9.3259	0.04371	18.7516

吸附剂	准一级动力学方程			准二级动力学方程
吸附剂	K/min	Qe/(mg/g)	R²	K/[g/(mg·h)]	Qe/(mg/g)	R²
PEBC	0.01017	2.87	0.5396	0.0137	118.06	0.9999
PGBC	0.00436	17.69	0.5665	0.0004	50.74	0.9968
LEBC	0.00434	24.59	0.9452	0.0005	81.10	0.9988

吸附剂	准一级动力学方程			准二级动力学方程
吸附剂	K/min	Qe/(mg/g)	R²	K/[g/(mg·h)]	Qe/(mg/g)	R²
PEBC	0.01017	2.87	0.5396	0.0137	118.06	0.9999
PGBC	0.00436	17.69	0.5665	0.0004	50.74	0.9968
LEBC	0.00434	24.59	0.9452	0.0005	81.10	0.9988

吸附剂	Langmuir模型			Freundlich模型
吸附剂	b/(L/mg)	Q₀/(mg/g)	R²	k	n	R²
PEBC	0.405	134.33	0.8887	101.26	18.18	0.9653
PGBC	0.054	49.41	0.9359	21.90	7.342	0.9694
LEBC	0.184	76.03	0.9308	51.38	14.29	0.9173