Adsorption of cadmium in solution by biochar at different pyrolysis temperatures

doi:10.11894/iwt.2018-1173

Abstract

Abstract:

Under anaerobic pyrolysis conditions, nine kinds of biochars were prepared by using corn straw, Maple poplar branches and peanut hulls as biomass materials at 450, 550 and 650℃, respectively. The effects of pH, biochar dosage, adsorption time and initial concentration of cadmium ions on the adsorption of cadmium ions were studied, respectively. The results showed that the process of adsorption had a good correlation with Langmuir, Freundlich and quasi-first-order kinetics equation models. Moreover, pH had a greater influence on the adsorption of Cd²⁺. The adsorption rate was proportional to the amount of biochar added, while the adsorption capacity was inversely proportional to the amount of biochar added. Three biochars prepared at 650℃ exhibited the strongest adsorption capacities. The peanut shell biochar could remove cadmium ion better in solution.

Key words: biochar, cadmium, adsorption, temperature

摘要：

以玉米秸秆、枫杨树枝、花生壳为生物质材料，分别在450、550、650℃下，对3种生物质材料进行厌氧热解制备了9种生物炭，对溶液中的Cd²⁺进行吸附试验，研究了pH、生物炭投加量、吸附时间和Cd²⁺初始质量浓度对Cd²⁺吸附效果的影响。结果表明，吸附过程与Langmuir、Freundlich和准一级动力学方程拟合的相关性较好。pH对吸附的影响较大，吸附率与生物炭的投加量呈正比，650℃制备的3种生物炭的吸附能力更强，花生壳生物炭对溶液中的Cd²⁺具有更好的吸附能力。

关键词: 生物炭, 镉, 吸附, 温度

CLC Number:

X703.1

Daohan Wang,Jingyang Li,Jiaxi Tang. Adsorption of cadmium in solution by biochar at different pyrolysis temperatures[J]. Industrial Water Treatment, 2020, 40(1): 18-23.

王道涵,李景阳,汤家喜. 不同热解温度生物炭对溶液中镉的吸附性能研究[J]. 工业水处理, 2020, 40(1): 18-23.

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URL: https://www.iwt.cn/EN/10.11894/iwt.2018-1173

https://www.iwt.cn/EN/Y2020/V40/I1/18

Figures/Tables 9

References 17

1	Luo Mingke , Lin Hai , Li Bing , et al. A novel modification of lignin on corncob-based biochar to enhance removal of cadmium from water[J]. Bioresource Technology, 2018, 259 (134): 312- 318. URL
2	Park C M , Han J , Chu K H , et al. Influence of solution pH, ionic strength, and humic acid on cadmium adsorption onto activated biochar:Experiment and modeling[J]. Journal of Industrial and Engineering Chemistry, 2017, 48, 186- 193. doi: 10.1016/j.jiec.2016.12.038
3	Zuo Weiqi , Chen Chen , Cui Haojie , et al. Enhanced removal of Cd(Ⅱ) from aqueous solution using CaCO₃ nanoparticle modified sewage sludge biochar[J]. RSC Advances, 2017, 26 (7): 16238- 16243.
4	张千丰, 孟军, 刘居东, 等. 热解温度和时间对三种作物残体生物炭pH及碳氮含量的影响[J]. 生态学杂志, 2013, 32 (9): 2347- 2353. URL
5	Chun Y , Sheng G Y , Chiou C T , et al. Compositions and sorptive properties of crop residue-derived chars[J]. Environment & Science Technology, 2004, 38 (17): 4649- 4655. URL
6	仇祯, 周欣彤, 韩卉, 等. 互花米草生物炭的理化特性及其对镉的吸附效应[J]. 农业环境科学学报, 2018, 37 (1): 172- 178. URL
7	Chen X C , Chen G C , Chen L G , et al. Adsorption of copper and zinc by biochars produced from pyrolysis of hardwood and corn straw in aqueous solution[J]. Bioresource Technology, 2011, 102 (19): 8877- 8884. doi: 10.1016/j.biortech.2011.06.078 URL
8	Kong H L , He J H , Gao Y Z , et al. Cosorption of phenanthrene and mercur(Ⅱ) from aqueous solution by soybean stalk-based biochar[J]. Journal of Agricultural & Food Chemistry, 2011, 59 (22): 12116- 12123.
9	徐啸, 刘伯羽, 邓正栋. 活性炭吸附重金属离子的影响因素分析[J]. 能源环境保护, 2010, 24 (2): 48- 50. doi: 10.3969/j.issn.1006-8759.2010.02.016
10	刘莹莹, 秦海芝, 李恋卿, 等. 不同作物原料热裂解生物质炭对溶液中Cd²⁺和Pb²⁺的吸附特性[J]. 生态环境学报, 2012, 21 (1): 146- 152. doi: 10.3969/j.issn.1674-5906.2012.01.026
11	谢超然, 王兆炜, 朱俊民, 等. 核桃青皮生物炭对重金属铅、铜的吸附特性研究[J]. 环境科学学报, 2016, 36 (4): 1190- 1198. URL
12	韩鲁佳, 李彦霏, 刘贤, 等. 生物炭吸附水体中重金属机理与工艺研究进展[J]. 农业机械学报, 2017, 48 (11): 1- 11. doi: 10.6041/j.issn.1000-1298.2017.11.001
13	杨雪, 张士秋, 侯其东, 等. 生物炭的制备及其镁改性对污染物的吸附行为研究[J]. 环境科学学报, 2018, 38 (10): 4032- 4043. URL
14	Wang Zhenyu , Zheng Hao , Luo Ye , et al. Characterization and influence of biochars on nitrous oxide emission from agricultural soil[J]. Environmental Pollution, 2013, 174, 289- 296. doi: 10.1016/j.envpol.2012.12.003 URL
15	Zheng H , Wang Z Y , Zhao J , et al. Characteristics and nutrient values of biochars produced from giant reed at different temperatures[J]. Bioresource Technology, 2013, 130, 463- 471. doi: 10.1016/j.biortech.2012.12.044 URL
16	韩鲁佳, 李彦霏, 刘贤, 等. 生物炭吸附水体中重金属机理与工艺研究进展[J]. 农业机械学报, 2017, 48 (11): 1- 11. doi: 10.6041/j.issn.1000-1298.2017.11.001
17	Xu Xiao Yun , Cao Xinde , Zhao Ling , et al. Removal of Cu, Zn, and Cd from aqueous solutions by the dairy manure-derived biochar[J]. Environment Science Pollution Research, 2013, 20 (1): 358- 368. doi: 10.1007/s11356-012-0873-5 URL

热解温度/℃	450	550	650
玉米秸秆	Y1	Y2	Y3
枫杨树枝	S1	S2	S3
花生壳	H1	H2	H3

热解温度/℃	450	550	650
玉米秸秆	Y1	Y2	Y3
枫杨树枝	S1	S2	S3
花生壳	H1	H2	H3

热解温度	生物炭型号	Langmuir			Freundlich
热解温度	生物炭型号	K_L	Q_m/（mg·g^-1）	R²	K_F	n	R²
450 ℃	Y1	0.026 36	10.074 43	0.984 43	0.771 17	2.028 19	0.961 38
	S1	0.029 69	12.851 70	0.997 22	0.996 68	1.986 37	0.977 24
	H1	0.182 58	17.995 77	0.989 10	4.606 63	3.047 67	0.925 27
550 ℃	Y2	0.108 84	14.530 67	0.987 21	2.831 92	2.608 72	0.977 84
	S2	0.299 11	15.231 95	0.946 87	5.111 92	3.712 09	0.952 59
	H2	1.840 50	19.611 63	0.968 14	9.842 58	4.459 11	0.943 69
650 ℃	Y3	0.248 81	12.140 73	0.987 17	3.716 85	3.592 73	0.965 36
	S3	0.273 67	17.009 57	0.981 18	5.118 70	3.335 56	0.937 22
	H3	6.628 90	19.449 53	0.943 50	10.559 64	4.264 76	0.922 65

热解温度	生物炭型号	Langmuir			Freundlich
热解温度	生物炭型号	K_L	Q_m/（mg·g^-1）	R²	K_F	n	R²
450 ℃	Y1	0.026 36	10.074 43	0.984 43	0.771 17	2.028 19	0.961 38
	S1	0.029 69	12.851 70	0.997 22	0.996 68	1.986 37	0.977 24
	H1	0.182 58	17.995 77	0.989 10	4.606 63	3.047 67	0.925 27
550 ℃	Y2	0.108 84	14.530 67	0.987 21	2.831 92	2.608 72	0.977 84
	S2	0.299 11	15.231 95	0.946 87	5.111 92	3.712 09	0.952 59
	H2	1.840 50	19.611 63	0.968 14	9.842 58	4.459 11	0.943 69
650 ℃	Y3	0.248 81	12.140 73	0.987 17	3.716 85	3.592 73	0.965 36
	S3	0.273 67	17.009 57	0.981 18	5.118 70	3.335 56	0.937 22
	H3	6.628 90	19.449 53	0.943 50	10.559 64	4.264 76	0.922 65

热解温度	生物炭型号	准一级动力学			准二级动力学
热解温度	生物炭型号	q_e/（mg·g^-1）	k₁/min^-1	R²	q_e/（mg·g^-1）	k₂/（g·mg^-1·min^-1）	R²
450 ℃	Y1	5.946 58	0.002 16	0.871 43	1.714 31	0.002 16	0.707 73
	S1	7.944 60	0.001 57	0.721 18	5.763 85	0.001 57	0.395 70
	H1	17.410 73	0.002 51	0.807 47	13.567 23	0.002 51	0.228 33
550 ℃	Y2	9.780 82	0.014 66	0.678 78	9.780 82	0.014 66	0.514 32
	S2	10.994 68	0.011 57	0.734 82	10.994 68	0.011 57	0.546 61
	H2	18.113 30	0.033 58	0.905 40	18.113 30	0.033 58	0.217 61
650 ℃	Y3	9.050 53	0.017 28	0.785 40	5.460 40	0.002 50	0.515 52
	S3	12.795 36	0.015 83	0.811 55	7.582 30	0.003 54	0.489 65
	H3	19.795 16	0.168 70	0.784 85	18.442 11	0.000 76	-0.033 96

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