Efficient removal and quantitative adsorption mechanisms of Pb from water by oxidized pine biochars

doi:10.19965/j.cnki.iwt.2020-0908

Abstract

Abstract:

Biochar was prepared from pine wood(PW) and modified by H₂O₂, KMnO₄ and Mn(CH₃COO)₂·4H₂O. The removal capacity and mechanism of Pb was explored through adsorption experiments and characterization, and various adsorption mechanisms were quantitatively analyzed to reveal the contribution rate of each mechanism. The adsorption capacity of Pb in the water of PW-H₂O₂, PW-Mn, PW-MnC was 6, 8.5 and 7.9 times that of the original biochar. The specific surface area of two kinds of manganese-modified biochar increased obviously and on the surface of which MnO₂ were formed. And the contribution rate of cation exchange to adsorption accounted for 74.6% and 87.5% of Pb adsorption. The results showed that PW-MnC was a kind of material with excellent comprehensive performance in removing heavy metal Pb from industrial wastewater.

Key words: pine biochar, chemical oxidation, industrial wastewater

摘要：

用H₂O₂、KMnO₄（Mn）和Mn（CH₃COO）₂·4H₂O（MnC）改性松木生物炭（PW），通过吸附实验和表征探究其对Pb的去除能力和去除机理，并定量分析各种吸附机制的贡献率。PW-H₂O₂、PW-Mn、PW-MnC对溶液中Pb的吸附量分别是原始生物炭的6、8.5、7.9倍。两种锰改性生物炭比表面积显著提高，其表面形成了MnO₂。阳离子交换对吸附的贡献率占PW-Mn、PW-MnC吸附Pb的74.6%、87.5%。表明BC-MnC是一种去除工业废水中重金属Pb的综合性能优异的材料。

关键词: 松木生物炭, 化学氧化, 工业废水

CLC Number:

X703
TQ424

Zhenyang Zhou,Chihao Yang,Huiqin Yin,Jianhua Hou,Shensen Wang,Xiaozhi Wang. Efficient removal and quantitative adsorption mechanisms of Pb from water by oxidized pine biochars[J]. Industrial Water Treatment, 2021, 41(7): 88-93.

周振扬,杨驰浩,尹微琴,侯建华,王圣森,王小治. 氧化松木生物炭高效去除水中Pb及定量吸附机理[J]. 工业水处理, 2021, 41(7): 88-93.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2020-0908

https://www.iwt.cn/EN/Y2021/V41/I7/88

Figures/Tables 10

References 11

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样本	C/%	H/%	N/%	O/%	Mn/（g·kg^-1）	H/C	灰分/%	BET表面积/（m²·kg^-1）	孔径/nm
PW	81.76	4.01	0.18	14.65	/	0.37	6.78	0.67	2.04
PW-H₂O₂	81.5	6.68	0.17	15.13	/	0.39	3.68	0.57	1.88
PW-Mn	42.4	3.76	0.14	20.54	201	0.45	42.13	15.89	3.62
PW-MnC	40.3	3.81	0.15	25.78	197	0.48	39.45	6.21	3.46

样本	C/%	H/%	N/%	O/%	Mn/（g·kg^-1）	H/C	灰分/%	BET表面积/（m²·kg^-1）	孔径/nm
PW	81.76	4.01	0.18	14.65	/	0.37	6.78	0.67	2.04
PW-H₂O₂	81.5	6.68	0.17	15.13	/	0.39	3.68	0.57	1.88
PW-Mn	42.4	3.76	0.14	20.54	201	0.45	42.13	15.89	3.62
PW-MnC	40.3	3.81	0.15	25.78	197	0.48	39.45	6.21	3.46

样品	准一级动力学			准二级动力学
样品	q_e/（mg·g^-1）	k₁/h^-1	R²	qe/（mg·g^-1）	k₂/（g·mg^-1·h^-1）	R²
PW	3.054 7	0.004 3	0.958 7	3.617 8	0.001 4	0.963 4
PW-H₂O₂	17.138 4	0.01	0.973 5	19.69 8	0.015 6	0.976 7
PW-MnC	19.871	0.010 8	0.938 6	22.592 8	0.014 8	0.982 7
PW-Mn	20.829 1	0.019 8	0.898 5	22.703 5	0.001 2	0.957 8

样品	准一级动力学			准二级动力学
样品	q_e/（mg·g^-1）	k₁/h^-1	R²	qe/（mg·g^-1）	k₂/（g·mg^-1·h^-1）	R²
PW	3.054 7	0.004 3	0.958 7	3.617 8	0.001 4	0.963 4
PW-H₂O₂	17.138 4	0.01	0.973 5	19.69 8	0.015 6	0.976 7
PW-MnC	19.871	0.010 8	0.938 6	22.592 8	0.014 8	0.982 7
PW-Mn	20.829 1	0.019 8	0.898 5	22.703 5	0.001 2	0.957 8

样品	Freundlich			Langmuir			Temkin
样品	K_f/（mg·g^-1）	1/n	R²	q_m/（mg·g^-1）	b	R²	B/（J·mol^-1）	K_t/（L·g^-1）	R²
PW	0.579 1	0.657 3	0.987 7	3.745 4	0.003 4	0.932 9	4.92	4.37	0.952 3
PW-H₂O₂	2.232 6	0.467 1	0.969 4	23.908 4	0.006 6	0.899 6	5.52	2.19	0.935 6
PW-MnC	5.871 9	0.874 8	0.971 2	29.589	0.003 7	0.8851	6.83	2.76	0.895 9
PW-Mn	7.897 1	0.856 3	0.977 6	32.018 1	0.001 8	0.889 9	6.96	2.89	0.910 7

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