磁性响应茶渣制备及其对水溶液中亚甲基蓝的吸附

doi:10.16085/j.issn.1000-6613.2017-2716

化工进展 ›› 2019, Vol. 38 ›› Issue (02): 1113-1121.DOI: 10.16085/j.issn.1000-6613.2017-2716

磁性响应茶渣制备及其对水溶液中亚甲基蓝的吸附

龚新怀^1,²(),辛梅华²,李明春²,李素琼¹,赵晓杰¹

1. 武夷学院生态与资源工程学院，福建省生态产业绿色技术重点实验室，福建武夷山 354300
2. 华侨大学材料科学与工程学院，环境友好功能材料教育部工程研究中心，福建厦门 361021

收稿日期:2017-12-30 修回日期:2018-02-05 出版日期:2019-02-05 发布日期:2019-02-05
作者简介:龚新怀（1985—），男，讲师，博士，从事生物质高值化利用与复合材料研究。Email:<email>wyu_gxh@163.com</email>。
基金资助:
福建省自然科学基金计划(2014N2013，2018J01445);福建省高校杰出青年科研人才计划(闽科教[2018]47号);福建省中青年教师教育科研(JAT170594);福建省生态产业绿色技术重点实验室开放课题(WYKF2018-5)

Preparation of magnetically responsive tea waste and it’s adsorption of methylene blue from aqueous solution

Xinhuai GONG^1,²(),Meihua XIN²,Mingchun LI²,Suqiong LI¹,Xiaojie ZHAO¹

1. Ecology and Resources Engineering College, Wuyi University, Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, Wuyishan 354300, Fujian, China
2. College of Material Science and Engineering, Huaqiao University, Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, Xiamen 361021, Fujian, China

Received:2017-12-30 Revised:2018-02-05 Online:2019-02-05 Published:2019-02-05

摘要/Abstract

摘要：

采用化学共沉淀技术制备了茶渣（TW）/纳米Fe₃O₄磁性复合材料（magnetic tea waste，MTW），用扫描电镜（SEM）、X射线光电子能谱仪（XPS）、傅里叶变换红外光谱仪（FTIR）、X射线粉末衍射仪（XRD）和比表面积测定仪（BET）对其结构进行了表征，并考察了其对水溶液中亚甲基蓝（methylene blue，MB）的吸附性能。结果表明，MTW磁性响应明显，其表面可见有颗粒状物质堆积。MTW对MB吸附量随Fe₃O₄负载量增加而先增大后减小，并在负载量为23.16%时达到最大，此时MTW表面Fe元素的原子分数为5.24%，比表面积比TW增大85.71%，孔容积增大1倍。在303K下其对MB的Langmuir最大吸附量为160.5mg/g，比TW提高了9.93%，并具有良好的再生与循环使用性能。

关键词: 茶渣, 磁性分离, 吸附, 亚甲基蓝, 循环回用

Abstract:

Tea waste/nano-Fe₃O₄ magnetic composited adsorbent(MTW) was prepared by co-precipitation approach and characterized by scanning electron microscope(SEM), X-ray photoelectron spectroscopy(XPS), Fourier transform infrared(FTIR), X-ray diffraction(XRD), and surface area measurement. The adsorption properties of the methylene blue(MB) from aqueous solution onto the MTW was also studied. The results showed that the MTW was successfully synthesized, which provided a good magnetic response. The surface of MTW was full of particulate matter deposited and showed a rough morphology. The adsorption capacity of MB onto MTW increased first then decreased with the increment in nano Fe₃O₄ content, and reached the maximum with 23.12wt% of nano Fe₃O₄. The content of Fe distributed on the surface of MTW with 23.16% content of nano Fe₃O₄ was at 5.24%. The specific surface area of the MTW was increased by 85.71% when compared with TW. The saturated adsorption capacities of MB onto MTW was 160.5mg/g at 303K, which was higher than TW by 9.93%. The adsorbent showed a satisfactory regeneration and recycling utilization performances.

Key words: tea waste, magnetically separation, adsorption, methylene blue, recycling utilization

中图分类号:

TQ424.3
X712

龚新怀, 辛梅华, 李明春, 李素琼, 赵晓杰. 磁性响应茶渣制备及其对水溶液中亚甲基蓝的吸附[J]. 化工进展, 2019, 38(02): 1113-1121.

Xinhuai GONG, Meihua XIN, Mingchun LI, Suqiong LI, Xiaojie ZHAO. Preparation of magnetically responsive tea waste and it’s adsorption of methylene blue from aqueous solution[J]. Chemical Industry and Engineering Progress, 2019, 38(02): 1113-1121.

图/表 17

参考文献 22

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项目	系列磁性茶渣
项目	MTW-0	MTW-1	MTW-2	MTW-3	MTW-4	MTW-5
茶渣/g	5.0000	5.0000	5.0000	5.0000	5.0000	5.0000
含水率/%	5.5400	5.5400	5.5400	5.5400	5.5400	5.5400
FeCl₂·4H₂O/g	0	0.2144	0.4287	0.8574	1.2860	1.7146
FeCl₃·6H₂O/g	0	0.5827	1.1653	2.3306	3.4959	4.6612
产物质量/g	3.8872	4.2018	4.4737	5.0198	5.4279	5.5981
质量收率/%	81.67	88.97	94.73	106.29	114.93	118.53
Fe₃O₄负载质量分数/%	0	8.20	13.78	23.16	28.93	31.09

项目	系列磁性茶渣
项目	MTW-0	MTW-1	MTW-2	MTW-3	MTW-4	MTW-5
茶渣/g	5.0000	5.0000	5.0000	5.0000	5.0000	5.0000
含水率/%	5.5400	5.5400	5.5400	5.5400	5.5400	5.5400
FeCl₂·4H₂O/g	0	0.2144	0.4287	0.8574	1.2860	1.7146
FeCl₃·6H₂O/g	0	0.5827	1.1653	2.3306	3.4959	4.6612
产物质量/g	3.8872	4.2018	4.4737	5.0198	5.4279	5.5981
质量收率/%	81.67	88.97	94.73	106.29	114.93	118.53
Fe₃O₄负载质量分数/%	0	8.20	13.78	23.16	28.93	31.09

吸附材料	吸附模型	拟合参数	参数值
吸附材料	吸附模型	拟合参数	303K	313K	323K
TW	Langmuir	Q _m/mg·g^-1	146	145.3	143.3
		K _L/L·mg^-1	0.05207	0.04436	0.04178
		R²	0.9995	0.9992	0.9989
MTW	Langmuir	Q _m/mg·g^-1	160.5	154.8	152
		K _L/L·mg^-1	0.09059	0.08061	0.07426
		R²	0.9993	0.9996	0.9998
	Freundlich	K _F/mol²·J^-2	38	34.36	31.7
		n	3.663	3.526	3.397
		R²	0.9461	0.9254	0.9209
	Tempkin	b _T	99.07	101.58	102.95
		K _T/L·mg^-1	2.172	1.631	1.3
		R²	0.9912	0.9817	0.9775

吸附材料	吸附模型	拟合参数	参数值
吸附材料	吸附模型	拟合参数	303K	313K	323K
TW	Langmuir	Q _m/mg·g^-1	146	145.3	143.3
		K _L/L·mg^-1	0.05207	0.04436	0.04178
		R²	0.9995	0.9992	0.9989
MTW	Langmuir	Q _m/mg·g^-1	160.5	154.8	152
		K _L/L·mg^-1	0.09059	0.08061	0.07426
		R²	0.9993	0.9996	0.9998
	Freundlich	K _F/mol²·J^-2	38	34.36	31.7
		n	3.663	3.526	3.397
		R²	0.9461	0.9254	0.9209
	Tempkin	b _T	99.07	101.58	102.95
		K _T/L·mg^-1	2.172	1.631	1.3
		R²	0.9912	0.9817	0.9775

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磁性响应茶渣制备及其对水溶液中亚甲基蓝的吸附

Preparation of magnetically responsive tea waste and it’s adsorption of methylene blue from aqueous solution

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