磁响应型胡敏酸纳米材料的制备及其对Cu(Ⅱ)的吸附性能

doi:10.16085/j.issn.1000-6613.2019-0716

摘要/Abstract

摘要：

为了扩大胡敏酸的应用范围，采用共沉淀法制备了磁响应型胡敏酸纳米材料（MHA）。通过FTIR、XRD、BET、VSM等对其结构进行表征，并研究了Cu(Ⅱ)在MHA上的吸附行为。其吸附等温线符合Langmuir吸附模型，显示单层吸附。吸附动力学满足伪二阶吸附动力学模型，以化学吸附为主。吸附热力学表明此吸附在25～55℃下是自发过程。结果表明，MHA是一种高效、可持续的Cu(Ⅱ)吸附剂。该研究为生物质吸附剂的设计提供了一条新的思路。

关键词: 磁响应型胡敏酸纳米材料, 表征, 吸附等温线, 吸附动力学, 吸附热力学

Abstract:

In order to expand the application range of humic acid, the magnetic humic acid adsorbent (MHA) were prepared byco-precipitation method. The structure was characterized by FTIR, XRD, BET and VSM. The adsorption behavior for Cu(Ⅱ) onto MHA was also studied. It was disclosed that the adsorption isotherm conformed to the Langmuir adsorption model, showing single layer adsorption. The adsorption kinetics can be described as the pseudo-second-order model, illustrating the adsorption of Cu(Ⅱ) on the MHA was chemisorption. Adsorption thermodynamics indicated that the adsorption was spontaneous at 25—55°C. The results showed that MHA was a highly efficient, sustainable adsorbent for Cu(Ⅱ) and provided a new insight for the design of biomass adsorbents.

Key words: magnetic humic acid, characterization, adsorption isotherm, adsorption kinetics, adsorption thermodynamics

中图分类号:

周敏茹,姚培,张启蒙,李树白,刘媛,夏守鑫. 磁响应型胡敏酸纳米材料的制备及其对Cu(Ⅱ)的吸附性能[J]. 化工进展, 2020, 39(3): 1145-1152.

Minru ZHOU,Pei YAO,Qimeng ZHANG,Shubai LI,Yuan LIU,Shouxin XIA. Preparation of magnetic humic acid adsorbent and its application in the removal for Cu(Ⅱ)[J]. Chemical Industry and Engineering Progress, 2020, 39(3): 1145-1152.

图/表 14

参考文献 26

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重金属离子	q_me/mg·g^-1	Langmuir等温模型			Freundlich 等温模型
重金属离子	q_me/mg·g^-1	q_mc/mg·g^-1	b/L·mg^-1	R²	k_F	n	R²
Cu(Ⅱ)	129.0	135.7	0.199	0.999	42.717	3.792	0.940

重金属离子	q_me/mg·g^-1	Langmuir等温模型			Freundlich 等温模型
重金属离子	q_me/mg·g^-1	q_mc/mg·g^-1	b/L·mg^-1	R²	k_F	n	R²
Cu(Ⅱ)	129.0	135.7	0.199	0.999	42.717	3.792	0.940

吸附剂	最大吸附容量 /mg·g^-1	吸附条件	文献
有机肥活性炭	21.9	pH=4.5	[19]
香蕉茎秆生物炭	81.36	pH=5	[20]
壳聚糖－牡蛎壳粉复合微球	46.58	室温	[21]
粉煤灰酸溶渣分子筛	41.02	室温, pH=8.0	[22]
鸟嘌呤改性纤维素	83	室温, pH=6	[23]
壳聚糖-草酸盐复合吸附剂	175.4	30°C, pH=5.0	[24]
MHA	128.3	25°C, pH=6.0	本研究

吸附剂	最大吸附容量 /mg·g^-1	吸附条件	文献
有机肥活性炭	21.9	pH=4.5	[19]
香蕉茎秆生物炭	81.36	pH=5	[20]
壳聚糖－牡蛎壳粉复合微球	46.58	室温	[21]
粉煤灰酸溶渣分子筛	41.02	室温, pH=8.0	[22]
鸟嘌呤改性纤维素	83	室温, pH=6	[23]
壳聚糖-草酸盐复合吸附剂	175.4	30°C, pH=5.0	[24]
MHA	128.3	25°C, pH=6.0	本研究

重金属离子	q_ee/mg·g^-1	伪一级方程			伪二级方程
重金属离子	q_ee/mg·g^-1	k₁/min^-1	q_ec/mg·g^-1	R²	k₂/min^-1	q_ec/mg·g^-1	R²
Cu(Ⅱ)	123.0	0.023	166.7	0.977	1.004×10^-4	157.2	0.990