Removal of lead ions in solution by modified coal waste adsorbent

doi:10.11894/iwt.2019-0972

Industrial Water Treatment ›› 2020, Vol. 40 ›› Issue (9): 44-48. doi: 10.11894/iwt.2019-0972

• Research and Experiment • Previous Articles Next Articles

Removal of lead ions in solution by modified coal waste adsorbent

Qing Yang¹(),Yunchuan Long^1,²,Mingshi Zhu³,Juan Jiang²,Xuejun Hu²,Jing Hu^1,²,Shaoqi Zhou^1,^2,^4,*()

1. College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China
2. Guizhou Academy of Sciences, Guiyang 550001, China
3. Guizhou Runhong Environmental Protection Co., Ltd., Xingyi 562400, China
4. School of Environment and Energy, South China University of Technology, Guangzhou 510006, China

Received:2020-07-05 Online:2020-05-20 Published:2020-10-21
Contact: Shaoqi Zhou E-mail:979699060@qq.com;2975742087@qq.com

改性燃煤废弃物吸附剂对水中Pb²⁺的去除

杨青¹(),龙云川^1,²,朱明石³,蒋娟²,胡雪筠²,胡菁^1,²,周少奇^1,^2,^4,*()

1. 贵州大学资源与环境工程学院, 贵州贵阳 550025
2. 贵州科学院, 贵州贵阳 550001
3. 贵州润鸿环保科技有限公司, 贵州兴义 562400
4. 华南理工大学环境与能源学院, 广东广州 510006

通讯作者: 周少奇 E-mail:979699060@qq.com;2975742087@qq.com
作者简介:杨青(1994-),硕士在读。电话:15519026756, E-mail:979699060@qq.com
基金资助:
国家重点研发计划项目(2016YFC0400702);贵州省科技厅项目(〔2018〕4005);贵州省科技厅项目(〔2019〕2975);贵州省科技厅项目(〔2020〕6001);贵州科学院项目(〔2019〕04)

Abstract

Abstract:

A variety of acid, alkali, saline reagents were introduced to modify coal cinder to prepare adsorbent. The effects of pH value, initial Pb²⁺ concentration, and adsorption dosage in batch experiments were investigated to evaluate its adsorbent to Pb²⁺. Three kinds of adsorption kinetics models and three kinds of isothermal adsorption models were applied to research adsorption behavior, and the leaching toxicity of adsorbent was also evaluated. The results showed that the adsorption capacity of cinder increased 4.55 times after modified by sulfuric acid. The optimal pH values of sulfuric acid modified cinder were 7.0. The adsorption kinetics of Pb²⁺ adsorption were best fitted by the Pseudo-second order model, which indicated it met the physical-chemical adsorption process. The isothermal adsorption was best described by Langmuir model. The maximum adsorption capacity could reach 131.58 mg/g. The adsorption is a spontaneous and endothermic reaction.

Key words: coal burning-waste, modification adsorbent, heavy metal adsorption

摘要：

以煤渣为原料，利用多种酸、碱、盐化学试剂改性制备吸附剂，探讨了溶液pH、Pb²⁺初始质量浓度、吸附剂投加量等因素对Pb²⁺吸附效果的影响，采用3种吸附动力学模型和3种等温吸附模型研究Pb²⁺的吸附行为，并评价了吸附剂的浸出毒性。结果表明：硫酸改性后，硫酸改性煤渣（SC）的吸附容量是改性前煤渣的4.55倍，改性煤渣的最佳吸附pH为7.0；对Pb²⁺的吸附过程符合拟二级反应动力学模型，是物理-化学复合吸附过程；等温吸附过程符合Langmuir模型，最大吸附量可达到131.58 mg/g；吸附反应是自发吸热进行的。

关键词: 燃煤废弃物, 改性吸附剂, 重金属吸附

CLC Number:

X703.1

Qing Yang,Yunchuan Long,Mingshi Zhu,Juan Jiang,Xuejun Hu,Jing Hu,Shaoqi Zhou. Removal of lead ions in solution by modified coal waste adsorbent[J]. Industrial Water Treatment, 2020, 40(9): 44-48.

杨青,龙云川,朱明石,蒋娟,胡雪筠,胡菁,周少奇. 改性燃煤废弃物吸附剂对水中Pb²⁺的去除[J]. 工业水处理, 2020, 40(9): 44-48.

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URL: https://www.iwt.cn/EN/10.11894/iwt.2019-0972

https://www.iwt.cn/EN/Y2020/V40/I9/44

Figures/Tables 10

References 16

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改性剂	1 g煤渣改性后的质量/g	吸附容量/（mg·g^-1）
对照组	1.000 0	7.86
盐酸	1.008 6	1.23
硝酸	1.016 6	4.27
硫酸	1.042 0	35.77
磷酸	1.054 4	4.16
氢氧化钠	1.061 6	11.24
氢氧化钾	1.069 8	9.04
氢氧化钙	1.082 0	10.92
氯化锰	1.060 2	3.38
氯化铁	1.039 7	4.09
氯化镁	1.073 5	7.01
碳酸钠	1.066 2	10.00
碘化钾	1.060 1	2.82

改性剂	1 g煤渣改性后的质量/g	吸附容量/（mg·g^-1）
对照组	1.000 0	7.86
盐酸	1.008 6	1.23
硝酸	1.016 6	4.27
硫酸	1.042 0	35.77
磷酸	1.054 4	4.16
氢氧化钠	1.061 6	11.24
氢氧化钾	1.069 8	9.04
氢氧化钙	1.082 0	10.92
氯化锰	1.060 2	3.38
氯化铁	1.039 7	4.09
氯化镁	1.073 5	7.01
碳酸钠	1.066 2	10.00
碘化钾	1.060 1	2.82

C₀/（mg·L^-1）	拟一级动力学模型			拟二级动力学模型			内扩散模型
C₀/（mg·L^-1）	k₁	Q_e/（mg·g^-1）	R²	k₂/（g·min^-1）	Q_e/（mg·g^-1）	R²	K_i	A_i	R²
50	0.023 5	6.962 9	0.939 8	0.008 8	15.197 6	0.999 4	0.860 4	5.118 6	0.693 4
200	0.037 0	39.682 1	0.992 3	0.001 2	40.322 6	0.993 6	3.541 5	1.137 1	0.896 4
500	0.014 8	62.884 5	0.951 5	0.000 3	77.519 4	0.991 7	4.156 3	5.123 7	0.940 3

C₀/（mg·L^-1）	拟一级动力学模型			拟二级动力学模型			内扩散模型
C₀/（mg·L^-1）	k₁	Q_e/（mg·g^-1）	R²	k₂/（g·min^-1）	Q_e/（mg·g^-1）	R²	K_i	A_i	R²
50	0.023 5	6.962 9	0.939 8	0.008 8	15.197 6	0.999 4	0.860 4	5.118 6	0.693 4
200	0.037 0	39.682 1	0.992 3	0.001 2	40.322 6	0.993 6	3.541 5	1.137 1	0.896 4
500	0.014 8	62.884 5	0.951 5	0.000 3	77.519 4	0.991 7	4.156 3	5.123 7	0.940 3

等温线方程	模型参数	温度
等温线方程	模型参数	20 ℃	30 ℃	40 ℃
Langmuir	Q_m/（mg·g^-1）	102.04	117.65	131.58
	K_L/（L·mg^-1）	0.010 3	0.008 9	0.008 4
	R²	0.991 9	0.990 6	0.985 5
Freundlich	K_F/（L·g^-1）	2.5541	2.634 2	2.878 9
	n	1.742 2	1.705 3	1.707 1
	R²	0.977 7	0.983 6	0.989 4
Temkin	A	0.277 6	0.273 7	0.290 1
	B	16.29 4	18.04 7	19.370 0
	R²	0.920 6	0.915 6	0.902 7

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