酸碱协同处理鸡粪后热解制生物炭及其对Cd2+的吸附研究

doi:10.19964/j.issn.1006-4990.2025-0018

Abstract

Abstract:

Addressing the resource utilization of chicken manure and the management of cadmium pollution in wastewater，using chicken manure as raw material，after synergistic treatment with wet phosphoric acid and potassium hydroxide，biochar（CMBC） was prepared by limited oxygen pyrolysis at 300，500，and 700 ℃ respectively.Fundamental properties of the biochar were analyzed using elemental analysis，specific surface area and pore size distribution analyzers，Raman spectroscopy，X-ray fluorescence（XRF），and Fourier transform infrared spectroscopy（FT-IR）.The adsorption properties and mechanisms of biochar for Cd²⁺ were investigated.The results indicated that when the pyrolysis temperature was increased from 300 ℃ to 500 ℃，significant changes occurred in the physicochemical properties of biochar，including yield，ash content，elemental composition，and pore structure.The specific surface area of CMBC500 reached 141.64 m²/g，with a total pore volume of 0.141 1 cm³/g and an average pore diameter of 4.82 nm，demonstrating that higher pyrolysis temperatures were more conducive to adsorption.Notably，CMBC500 exhibited a maximum adsorption capacity of 99.28 mg/g.However，further increasing the pyrolysis temperature from 500 ℃ to 700 ℃ resulted in minimal changes in both the physicochemical properties and adsorption capacity of the biochar.The adsorption process of Cd²⁺ onto biochar was followed the Elovich equation and Sips model，suggesting a non-homogeneous adsorption process involving diverse mechanisms.With the increases of the initial solution pH，the adsorption capability of Cd²⁺ of biochar was improved.The presence of Ca²⁺ and Mg²⁺also led to a reduction in adsorption capacity.Based on the adsorption experiment，the adsorption of Cd²⁺ by CMBC was mainly physical adsorption，supplemented by chemical adsorption such as electrostatic interaction，ion exchange，and functional group complexation.

Key words: chicken manure, biochar, adsorption, cadmium

CLC Number:

TQ127.1

HONG Menghuan, NASEN Bate, WANG Yaya, LI Shuangqin, XU Dehua, YAN Zhengjuan, LIU Wei, WANG Xinlong. Study on preparation of biochar via pyrolysis of acid-base synergistically treated chicken manure and its adsorption performance for Cd²⁺[J]. Inorganic Chemicals Industry, 2026, 58(2): 68-75.

Figures/Tables 11

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References 20

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生物炭	准一级动力学			准二级动力学			Elovich
生物炭	k₁/ min^-1	Q_e/ （mg·g^-1）	R²	k₂/（g·mg^-1·min^-1）	Q_e/ （mg·g^-1）	R²	α/（mg·g^-1·min^-1）	β/ （g·mg^-1）	R²
CMBC300	0.01	74.96	0.884 6	2.15×10^-4	83.24	0.953 7	4.11	0.067 5	0.992 8
CMBC500	0.03	88.27	0.782 0	4.66×10^-4	93.84	0.901 1	24.95	0.076 9	0.975 6
CMBC700	0.04	87.20	0.700 8	6.18×10^-4	92.40	0.858 8	39.47	0.082 4	0.985 1

等温吸附模型		CMBC300	CMBC500	CMBC700
Langmuir	Q_m/（mg·g^-1）	69.38	98.66	98.27
	k_L/（L·mg^-1）	2.20	3.55	2.49
	R²	0.934 1	0.962 3	0.951 9
Freundlich	k_F/（mg^1-1/nF·L^1/nF·g^-1）	40.37	59.80	57.91
	n_F	8.649	8.724	8.310
	R²	0.908 3	0.853 9	0.871 8
Sips	Q_m/（mg·g^-1）	75.38	102.31	103.9
	k_S/（L^nS·mg^nS）	1.287	2.260	1.692
	n_S	0.512 0	0.627 9	0.565 4
	R²	0.996 4	0.986 7	0.983 7
D-R	Q_m/（mg·g^-1）	66.90	96.54	95.86
	β₂/［mol²·（kJ^-1）²］	0.045 4	0.048 5	0.071 6
	R²	0.824 9	0.915 9	0.900 5

生物炭	T/℃	k_L/ （L·mg^-1）	ΔG⁰/ （kJ·mol^-1）	ΔH⁰/ （kJ·mol^-1）	ΔS⁰/（J·mol^-1·K^-1）
CMBC300	10	1.99	-1.62	3.99	19.87
	25	2.20	-1.95
	40	2.34	-2.21
CMBC500	10	2.54	-2.19	11.28	47.81
	25	3.55	-3.14
	40	4.01	-3.61
CMBC700	10	1.69	-1.24	17.03	64.52
	25	2.49	-2.26
	40	3.38	-3.17

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Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of biochar via pyrolysis of acid-base synergistically treated chicken manure and its adsorption performance for Cd²⁺

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