掺镍 ZnFe<sub>2</sub>O<sub>4</sub> 复合材料的制备及其除藻性能

邓冬祝; 李铃; 曹传麒; 廖丹伶; 莫创荣; 李雪棠

掺镍 ZnFe₂O₄ 复合材料的制备及其除藻性能

1.
广西大学　资源环境与材料学院, 广西南宁 530000
2.
广西大学　化学化工学院, 广西南宁 530000

基金项目: 国家自然科学基金 (基金号：22065003)

详细信息

通讯作者:
莫创荣，博士，副教授，硕士生导师，研究方向为高级氧化　E-mail: mochuangrong@163.com

中图分类号: X524;TB332
计量
- 文章访问数: 106
- HTML全文浏览量: 46
- 被引次数: 0
出版历程
- 收稿日期: 2023-10-30
- 修回日期: 2023-11-27
- 录用日期: 2023-12-01
- 网络出版日期: 2023-12-25

Preparation of nickel-doped ZnFe₂O₄ composites and their algal removal properties

1.
School of Resources, Environment and Materials, Guangxi University, Nanning530000, Guangxi, China
2.
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530000, Guangxi, China

Funds: National Natural Science Foundation of China (No.22065003)

摘要

摘要: 水体富营养化导致的有害藻华(HABs)爆发日益严重，对水环境和人类健康构成了巨大的威胁。本文采用简单的水热法制备了磁性可回收的镍掺杂 ZnFe₂O₄(Ni-ZFO)吸附剂，用于去除水体中的铜绿微囊藻。通过 SEM、XRD、EDS、XPS 和 VSM 对材料进行了表征。在 30 分钟内，Ni-ZFO 复合材料的藻细胞去除率最高可达 99.09%，在 25℃、pH= 3-8 的条件下，去除率保持在 90.41% 以上。此外，Ni-ZFO的饱和磁化强度为67.93 emu/g，比ZnFe₂O₄(ZFO)高10.74 emu/g，便于回收利用。吸附过程中藻胆蛋白含量并未增加，藻细胞在吸附过程中不会破裂，这就避免了藻毒素进入水环境而造成的二次污染。经过4次循环使用后除藻率仍保持在75%以上。本文合成的 Ni-ZFO 吸附剂对藻细胞具有较强的去除效率，且不会造成二次污染，在缓解水体富营养化的实际应用中显示出巨大的潜力，同时也充实了改性ZFO在吸附领域的应用。
- 铜绿微囊藻 /
- 铁酸锌 /
- 吸附 /
- 除藻 /
- 复合材料 /
- 富营养化
Abstract: Harmful algal blooms (HABs) outbreaks due to eutrophication of water bodies are becoming increasingly serious, posing a great threat to the water environment and human health. In this paper, magnetic and recoverable nickel-doped ZnFe₂O₄ (Ni-ZFO) adsorbents were prepared by a simple hydrothermal method for the removal of Microcystis aeruginosa from water bodies. The materials were characterized by SEM, XRD, EDS, XPS and VSM. The algal cell removal of Ni-ZFO composites was up to 99.09% within 30 min and remained above 90.41% at 25℃ and pH = 3-8. In addition, the saturation magnetization intensity of Ni-ZFO was 67.93 emu/g, which was 10.74 emu/g higher than that of ZnFe₂O₄ (ZFO), and it was easy to be recycled. The content of algal bile proteins did not increase in the adsorption process, and the algal cells would not be ruptured during the adsorption process, which avoids the secondary pollution caused by Microcystins entering the water environment. The algal removal rate remained above 75% after four times of recycling. The Ni-ZFO adsorbent synthesized in this paper has strong removal efficiency for algal cells and does not cause secondary pollution, which shows great potential in the practical application of mitigating eutrophication of water bodies, and also enriches the application of modified ZFO in the field of adsorption.
- Microcystis aeruginosa /
- zinc ferrate /
- adsorption /
- algal removal /
- composites /
- eutrophicatio

HTML全文

图 1 (a-b) ZFO 的扫描电镜图; (c-d) Ni-ZFO 的扫描电镜图; (e-h) 元素(O、Fe、Ni、Zn)的 EDS 图谱

Figure 1. (a-b) The SEM plot of the ZFO; (c-d) The SEM plot of the Ni-ZFO; (e-h) EDS patterns of elements (O, Fe, Ni, Zn)

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图 2 ZFO、Ni-ZFO 的 XRD 图谱

Figure 2. XRD patterns of ZFO, Ni-ZFO

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图 3 Ni-ZFO 使用前后的傅立叶变换红外光谱图

Figure 3. FTIR profiles of Ni-ZFO before and after use

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图 4 Ni-ZFO 的XPS 光谱: (a) survey; (b) C 1 s; (c) O 1 s; (d) Fe 2p; (e) Ni 2p; (f) Zn 2p。

Figure 4. The XPS spectra of survey(a), C 1 s(b), O 1 s(c), Fe 2p(d), Ni 2p(e), Zn 2p (f) for Ni-ZFO

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图 5 ZFO、Ni-ZFO 的磁滞回归线

Figure 5. Hysteresis regression line of ZFO, Ni-ZFO

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图 6 Ni-ZFO (a)、ZFO (b)的氮吸附-解吸和孔径分布

Figure 6. Nitrogen adsorption-desorption and pore size distribution of Ni-ZFO (a), ZFO (b)

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图 7 (a) Ni-ZFO 、ZFO除藻率对比图；(b) Ni-ZFO 吸附剂用量对除藻率的影响；(c) pH 对Ni-ZFO除藻率的影响；(d) 藻密度对Ni-ZFO除藻率的影响；(e) 温度对Ni-ZFO除藻率的影响；(f) 转速对Ni-ZFO除藻率的影响

Figure 7. (a) Comparison of algal removal rates of Ni-ZFO and ZFO; (b) Effect of Ni-ZFO adsorbent dosage on algae removal rate; (c) Effect of pH on the Algae Removal Rate of Ni-ZFO; (d) Effect of Algae Density on the Algae Removal Rate of Ni-ZFO; (e) Effect of Temperature on the Algae Removal Rate of Ni-ZFO; (f) Effect of Speed on the Algae Removal Rate of Ni-ZFO

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图 8 除藻过程中藻细胞溶液的 OD₆₂₀

Figure 8. OD₆₂₀ of algal cell solution during algal removal

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图 9 Ni-ZFO吸附后藻絮体液态扫描电镜观察

Figure 9. Scanning electron microscope observation of the liquid state of algal flocs after Ni-ZFO adsorption

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图 10 (a)Ni-ZFO的阴离子干扰实验;(b)Ni-ZFO的循环实验

Figure 10. (a)Anion interference experiment of Ni-ZFO; (b)Cycle experiment of Ni-ZFO

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图 11 Ni-ZFO的Zeta电位图

Figure 11. Zeta potential diagram of Ni-ZFO

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