磁性γ-Fe<sub>2</sub>O<sub>3</sub>/玉米秸秆淀粉的制备及其对废水中U(VI)吸附性能

范甲; 胡世琴; 魏柏; 杨金辉; 曾倩; 杨芳婷

doi:10.13801/j.cnki.fhclxb.20211124.001

磁性γ-Fe₂O₃/玉米秸秆淀粉的制备及其对废水中U(VI)吸附性能

doi: 10.13801/j.cnki.fhclxb.20211124.001

范甲¹,
胡世琴^{1, 2},
魏柏^{1, 2},
杨金辉^{1, 2, ,},
曾倩¹,
杨芳婷¹

1.
南华大学　土木工程学院，衡阳 421001
2.
南华大学　污染控制与资源化技术湖南省高校重点实验室，衡阳421001

基金项目: 国家级大学生创新创业训练项目(S202010555024)

详细信息

通讯作者:
杨金辉，硕士，教授，硕士生导师，研究方向为水处理材料　E-mail ：842893915@qq.com

中图分类号: TQ424
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- 文章访问数: 774
- HTML全文浏览量: 274
- PDF下载量: 31
- 被引次数: 0
出版历程
- 收稿日期: 2021-08-09
- 修回日期: 2021-10-29
- 录用日期: 2021-11-13
- 网络出版日期: 2021-11-25
- 刊出日期: 2022-08-22

Preparation of magnetic γ-Fe₂O₃/corn stalk starch and its adsorption performance for U(VI) in wastewater

FAN Jia¹,
HU Shiqin^{1, 2},
WEI Bai^{1, 2},
YANG Jinhui^{1, 2
, ,},
ZENG Qian¹,
YANG Fangting¹

1.
College of Civil Engineering, University of South China, Hengyang 421001, China
2.
Hunan Province Key Laboratory of Pollution Control and Resource Reuse Technology, University of South China, Hengyang 421001, China

摘要

摘要: 随着核能发展，放射性核素铀通过各种途径流入环境，对人类的身体健康构成潜在威胁。以废弃玉米秸秆为原料自制玉米秸秆淀粉(CSS)，采用共沉淀法将磁性γ-Fe₂O₃包裹在CSS表面合成磁性γ-Fe₂O₃/CSS，并用于溶液中U(VI)的吸附。考察初始pH值、投加量、时间、初始浓度、温度和共存离子等因素对γ-Fe₂O₃/CSS吸附U(VI)性能的影响，并加以分析。采用SEM、FTIR、XPS对吸附前后的磁性γ-Fe₂O₃/CSS进行表征分析，深入研究其对吸附U(VI)的技术机制。结果表明：在适宜条件下，γ-Fe₂O₃/CSS对U(VI)的最大吸附量达到214.1 mg/g。准二级动力学模型更准确地描述其吸附过程即以化学吸附为主。磁性γ-Fe₂O₃/CSS对U(VI)吸附符合Langmuir模型和Freundlich模型。吸附机制主要为U(VI)与γ-Fe₂O₃/CSS的羟基、羧基发生络合反应与离子交换作用。通过4次吸附解吸实验表明，U(VI)吸附率仍在78.60%以上，说明磁性γ-Fe₂O₃/CSS具有一定的再生能力。
- γ-Fe₂O₃ /
- 玉米秸秆淀粉 /
- 铀 /
- 吸附性能 /
- 离子交换
Abstract: With the development of nuclear energy, the radionuclide uranium flows into the environment through various channels, posing a potential threat to human health. Using waste corn stalks as raw materials, self-made corn stalk starch (CSS) was used, and magnetic γ-Fe₂O₃ was wrapped on the surface of CSS by co-precipitation method to synthesize magnetic γ-Fe₂O₃/CSS, which was used to adsorb U(VI) in the solution. The effects of factors such as initial pH value, dosage, time, initial concentration, temperature and coexisting ions on the adsorption performance of γ-Fe₂O₃/CSS for U(VI) were investigated and analyzed. The SEM, FTIR, XPS were used to characterize and analyze the magnetic γ-Fe₂O₃/CSS before and after adsorption, and the technical mechanism of adsorption of U(VI) was deeply studied. The results show that the maximum adsorption capacity of γ-Fe₂O₃/CSS for U(VI) reaches 214.1 mg/g in certain conditions. The quasi-second-order kinetic model describes the adsorption process more accurately, that is, chemical adsorption is the main. The adsorption of magnetic γ-Fe₂O₃/CSS on U(VI) satisfies Langmuir model and Freundlich model. The adsorption mechanism is mainly complex reaction and ion exchange between U(VI) and the hydroxyl and carboxyl groups of γ-Fe₂O₃/CSS. Four adsorption and desorption experiments show that the U(VI) adsorption rate is still above 78.60%, indicating that the magnetic γ-Fe₂O₃/CSS has a certain regeneration ability.
- γ-Fe₂O₃ /
- corn stalk starch /
- uranium /
- adsorption performance /
- ion exchange

HTML全文

图 1 磁性γ-Fe₂O₃/玉米秸秆淀粉(CSS)材料构筑示意图

Figure 1. Schematic diagram of the construction of magnetic γ-Fe₂O₃/corn stalk starch (CSS) materials

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图 2 γ-Fe₂O₃/CSS吸附U(VI)前(a)和吸附U(VI)后(b)的 SEM 图像

Figure 2. SEM images of γ-Fe₂O₃/CSS before (a) and after (b) adsorption of U(VI)

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图 3 γ-Fe₂O₃/CSS吸附U(VI)前后的FTIR图谱

Figure 3. FTIR spectra of γ-Fe₂O₃/CSS before and after the adsorption of U(VI)

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图 4 γ-Fe₂O₃/CSS吸附U(VI)前后的XPS全谱图 (a) 和U4f (b)、Fe2p (c) 和O1s (d) 的精细图谱

Figure 4. XPS full spectra of γ-Fe₂O₃/CSS before and after adsorption of U(VI) (a) and fine spectrums of U4f (b), Fe2p (c) and O1s (d)

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图 5 pH对γ-Fe₂O₃/CSS吸附性能的影响

Figure 5. Effect of pH on the adsorption performance of γ-Fe₂O₃/CSS

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图 6 γ-Fe₂O₃/CSS投加量对吸附性能的影响

Figure 6. Effect of dosage on the adsorption performance of γ-Fe₂O₃/CSS

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图 7 时间对γ-Fe₂O₃/CSS吸附U(VI)影响 (a) 和准一级 (b)、准二级(c)动力学拟合曲线

Figure 7. Influence of time on the adsorption of U(VI) by γ-Fe₂O₃/CSS (a) and the kinetic fitting curves of quasi-first-order (b) and quasi-second-order (c)

q—Adsorption capacity; q_t—Adsorption capacity of adsorbent to U(VI) at time t; q_e—Equilibrium adsorption capacity to U(VI)

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图 8 初始浓度对γ-Fe₂O₃/CSS吸附U(VI)的影响(a)及Freundlich (b)、Langmuir (c)等温线拟合曲线

Figure 8. Effect of initial concentration on the adsorption of U(VI) by γ-Fe₂O₃/CSS (a) and the fitting curves of Freundlich (b) and Langmuir (c) isotherms

C_e—Equilibrium concentration of adsorbed U(VI)

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图 9 温度对γ-Fe₂O₃/CSS吸附性能的影响

Figure 9. Effect of temperature on the adsorption performance of γ-Fe₂O₃/CSS

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图 10 共存离子对γ-Fe₂O₃/CSS吸附性能的影响

Figure 10. Effect of coexisting ions on the adsorption performance of γ-Fe₂O₃/CSS

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图 11 γ-Fe₂O₃/CSS的再生性能

Figure 11. Regenerative performance of γ-Fe₂O₃/CSS

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表 1 γ-Fe₂O₃/CSS对U(VI)吸附动力学参数

Table 1. Adsorption kinetics parameters of U(VI) by γ-Fe₂O₃/CSS

Adsorbent	q_e(Experiment)/ (mg·g⁻¹)	Quasi-first-order dynamics model			Quasi-second-order dynamics model
Adsorbent	q_e(Experiment)/ (mg·g⁻¹)	K₁/min⁻¹	q_e(Calculation)/ (mg·g⁻¹)	R²	K₂/(g·mg⁻¹·min⁻¹)	q_e(Calculation)/ (mg·g⁻¹)	R²
γ-Fe₂O₃/CSS	74.76	0.0419	6.15	0.9518	0.0241	75.02	0.9999
Notes: q_e—Equilibrium adsorption capacity to U(VI); K₁—Adsorption rate constant of quasi-first-order model; K₂—Adsorption rate constant of quasi-second-order model; R²—Correlation coefficient.

下载: 导出CSV

表 2 γ-Fe₂O₃/CSS对U(VI)的吸附等温线拟合参数

Table 2. Adsorption isotherm parameters of U(VI) by γ-Fe₂O₃/CSS

Freundlich			Langmuir
K_F	1/n	R²	q_m/(mg·g⁻¹)	K_L	R²
116.7	0.238	0.9866	214.1	1.99	0.9818
Notes: K_F—Adsorption equilibrium constant of Freundlich model; K_L—Adsorption equilibrium constant of Langmuir model; 1/n—Empirical parameter related to adsorption strength; q_m—Maximum adsorption capacity of γ-Fe₂O₃/CSS to U(VI).

下载: 导出CSV

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