一步法制备糖蜜基活性炭及其界面吸附行为

doi:10.7503/cjcu20170221

高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (12): 2156.doi: 10.7503/cjcu20170221

• 研究论文: 无机化学 • 上一篇下一篇

一步法制备糖蜜基活性炭及其界面吸附行为

高烨^1,³, 王威², 庞丽云², 曹礼媛², 郭玉鹏²(), 赵纯¹()

1. 吉林大学电子科学与工程学院, 2. 化学学院, 长春 130012
2. 化学学院, 长春 130012
3. 长春师范大学化学学院, 长春 130032

收稿日期:2017-04-11 出版日期:2017-12-10 发布日期:2017-11-21
作者简介:联系人简介: 赵纯, 男, 博士, 教授, 主要从事导电聚合物和无机纳米颗粒制备复合薄膜方面的研究. E-mail: zchun@jlu.edu.cn.郭玉鹏, 男, 博士, 教授, 主要从事功能材料的制备及应用研究. E-mail: guoyupeng@jlu.edu.cn.
基金资助:
国家自然科学基金(批准号: J1103302)和长春师范大学自然科学基金资助

One-step Synthesis of Activated Carbon from Molasses and Its Interfacial Adsorption Behavior^†

GAO Ye^1,³, WANG Wei², PANG Liyun², CAO Liyuan², GUO Yupeng^2,^*(), ZHAO Chun^1,^*()

1. College of Electronic Science and Engineering
2. College of Chemistry, Jilin University, Changchun 130012, China
3. College of Chemistry, Changchun Normal University, Changchun 130032, China

Received:2017-04-11 Online:2017-12-10 Published:2017-11-21
Contact: GUO Yupeng,ZHAO Chun E-mail:guoyupeng@jlu.edu.cn;zchun@jlu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.J1103302) and the Natural Science Foundation of Changchun Normal University, China

摘要/Abstract

摘要：

以糖厂废弃的糖蜜为原料, Na₂CO₃为活化剂, 采用一步直接化学活化法制备了糖蜜基活性炭(AC). 采用X射线衍射(XRD)、扫描电子显微镜(SEM)、 N₂吸附-脱附及元素分析手段对产物进行了表征, 证实其为多孔的石墨化碳材料, 比表面积高达1023 m²/g. 研究了糖蜜基活性炭对溶液中的重金属离子Pb(Ⅱ)的脱除性能, 结果表明: 糖蜜基活性炭的吸附容量高于市售活性炭(CC), 且所需吸附时间和投炭量均低于市售活性炭; 其吸附动力学符合准二级动力学的Langmuir吸附, 为单分子层的化学吸附; 吸附Pb(Ⅱ)的糖蜜基活性炭可循环再生和重复使用.

关键词: 糖蜜, 活性炭, 低成本, 循环再生, 界面吸附

Abstract:

The molasses-based activated carbon(AC) was prepared with Na₂CO₃ as activator by one-step chemical activation method. With the characterization of X-ray diffraction(XRD), scanning electron microscopy(SEM), N₂ adsorption-desorption analysis and elemental analysis, the results showed that the activated carbon is graphitized carbon with specific surface area of 1023 m²/g. The removal capacity of molasses-based activated carbon on Pb(Ⅱ) in solution was studied, the results showed that the adsorption capacity of molasses-based activated carbon was higher than that of commercial activated carbon(CC). With the molasses-based activated carbon as adsorbent, the adsorption time was shorter and the mass of activated carbon were lower than those with commercial activated carbon as adsorbent. The adsorption kinetic fitted better to pesudo-second-order Langumir model, demonstrating a chemical adsorption of monolayer. The molasses-based activated carbon can be recycled and reused for Pb(Ⅱ) adsorption.

Key words: Molasses, Activated carbon, Low-cost, Recycle, Interfacial adsorption

中图分类号:

O613

TrendMD:

高烨, 王威, 庞丽云, 曹礼媛, 郭玉鹏, 赵纯. 一步法制备糖蜜基活性炭及其界面吸附行为. 高等学校化学学报, 2017, 38(12): 2156.

GAO Ye, WANG Wei, PANG Liyun, CAO Liyuan, GUO Yupeng, ZHAO Chun. One-step Synthesis of Activated Carbon from Molasses and Its Interfacial Adsorption Behavior^†. Chem. J. Chinese Universities, 2017, 38(12): 2156.

图/表 9

Fig.1 One-step synthesis of activated carbon from molasses for adsorption of Pb(Ⅱ)

Fig.2 XRD pattern of AC/850/1/4∶1

Fig.3 SEM images of AC/850/1/4∶1(A) and CC(B)

Table 1 Textural characteristics and the specific capacity of AC/850/1/4∶1 and CC*

Sample	S_BET/(m²·g^-1)	V_t/(cm³·g^-1)	V_mic/(cm³·g^-1)	V_mes/(cm³·g^-1)	D_ave/nm	S_mic/(m²·g^-1)	S_ext/(m²·g^-1)
AC/850/1/4∶1	1023	0.49	0.08	0.35	23.8	675	328
CC	544	0.26	0.05	0.07	10.3	345	199

Fig.4 Effects of initial concentration of Pb(Ⅱ)(A), time(B), pH(C), mass of AC(D) and temperature(E) on adsorption of Pb(Ⅱ)

Fig.5 Linear kinetic plots of pseudo-second order model for Pb(Ⅱ) adsorptionPb(Ⅱ) concentration: 70 mg/L; volume of Pb(Ⅱ) solution: 50 mL; mass of AC and CC: 0.1 g; pH=5; contact time: 0~1440 min; temperature: 298 K.

Table 2 Pseudo-second order kinetic model constants for the adsorption of Pb(Ⅱ) onto adsorbents

Adsorbent	q_e,cal/(mg·g^-1)	q_e,exp/(mg·g^-1)	10³ k₂/g·(mg·min)^-1	r²
AC	33.03	34.98	10.00	0.99999
CC	19.15	20.94	2.71	0.99981

Fig.6 ce/qe-ce plots for Pb(Ⅱ) adsorptionPb(Ⅱ) concentration: 25—400 mg/L; volume of Pb(Ⅱ) solution: 50 mL; mass of AC and CC: 0.1 g; pH=5; contact time: 240 min; temperature: 298 K.

Table 3 Langmuir parameters for the adsorption of Pb(Ⅱ) onto adsorbents

Adsorbent	q_m/(mg·g^-1)	k_L/(L·mg^-1)	r²
AC	880.0	0.74	0.9999
CC	480.2	0.43	0.9998

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一步法制备糖蜜基活性炭及其界面吸附行为

One-step Synthesis of Activated Carbon from Molasses and Its Interfacial Adsorption Behavior^†

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一步法制备糖蜜基活性炭及其界面吸附行为

One-step Synthesis of Activated Carbon from Molasses and Its Interfacial Adsorption Behavior†

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One-step Synthesis of Activated Carbon from Molasses and Its Interfacial Adsorption Behavior^†