NHFO@蜂巢石的制备及其吸附氨氮机制

黄健; 孙运运; 张华; 奚姗姗; 王金花; 张佳妹; 何春华; 罗涛; 余韵韩

doi:10.13801/j.cnki.fhclxb.20230222.010

NHFO@蜂巢石的制备及其吸附氨氮机制

doi: 10.13801/j.cnki.fhclxb.20230222.010

黄健^{1, 2, 3},
孙运运^{1, 2, 3},
张华^{1, 2, 3, ,},
奚姗姗^{1, 2, 3},
王金花^{1, 2, 3},
张佳妹^{1, 2, 3},
何春华^{1, 2, 3},
罗涛^{1, 2, 3},
余韵韩^{1, 2}

1.
安徽建筑大学　环境与能源工程学院，合肥 230601
2.
环境污染控制与废弃物资源化利用安徽省重点实验室，合肥 230601
3.
安徽省生态文明研究院，合肥 230601

基金项目: 国家重点研发计划专项项目(2019YFC0408504)；安徽省高校省级自然科学研究项目(KJ2019ZD52；KJ2020A0466；KJ2021A0619)；安徽建筑大学引进人才及博士启动基金项目(2019QDZ64；2019QDZ60)

详细信息

通讯作者:
张华，博士，教授，硕士生导师，研究方向为水处理理论与技术　E-mail: zhanghuapaper@163.com

中图分类号: X703；TB33
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- 被引次数: 0
出版历程
- 收稿日期: 2022-11-10
- 修回日期: 2022-12-15
- 录用日期: 2023-02-15
- 网络出版日期: 2023-02-23
- 刊出日期: 2023-11-01

Preparation and adsorption mechanism of NHFO@pumice for ammonia nitrogen

HUANG Jian^{1, 2, 3},
SUN Yunyun^{1, 2, 3},
ZHANG Hua^{1, 2, 3
, ,},
XI Shanshan^{1, 2, 3},
WANG Jinhua^{1, 2, 3},
ZHANG Jiamei^{1, 2, 3},
HE Chunhua^{1, 2, 3},
LUO Tao^{1, 2, 3},
YU Yunhan^{1, 2}

1.
School of Environmental and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
2.
Anhui Provincial Key Laboratory of Environment Pollution Control and Resource Reuse, Hefei 230601, China
3.
Anhui Research Academy of Ecological Civilization, Hefei 230601, China

Funds: National Key Research and Development Program (2019YFC0408504); Provincial Natural Science Research Project of Higher Education in Anhui Province (KJ2019ZD52; KJ2020A0466; KJ2021A0619); Introduction of Talents and Doctoral Program of Anhui Jianzhu University (2019QDZ64; 2019QDZ60)

摘要

摘要: 蜂巢石与纳米水合氧化铁(NHFO)是水处理中常用的吸附剂，研究采用共沉淀法将NHFO负载到蜂巢石上，探究其对氨氮的吸附性能及机制。实验探究了初始氨氮浓度、初始pH值及共存阳离子(H⁺、Na⁺、K⁺、Mg²⁺)对NHFO@蜂巢石吸附氨氮的影响。采用SEM-EDS、XRD等手段表征NHFO@蜂巢石的形貌及结构。结果显示：氨氮初始浓度为20 mg/L，pH值7左右时具有较好的吸附能力；共存离子对氨氮的吸附有抑制作用，抑制强度为H⁺>Na⁺>K⁺>Mg²⁺。SEM-EDS、XRD、FTIR等表征手段证实了NHFO成功负载在蜂巢石上，吸附过程符合Langmuir吸附等温线(R²=0.9886)和准二级动力学模型(R²=0.9969)。研究表明：氨氮主要通过羟基和NH₄⁺的静电作用、离子交换和孔隙吸附共同实现的。该研究为吸附法处理氨氮废水提供了理论依据。
- 蜂巢石 /
- 水合氧化铁 /
- 吸附 /
- 氨氮 /
- 机制
Abstract: Both pumice and nano hydrous iron oxide (NHFO) are commonly used adsorbents in water treatment. In this study, NHFO was loaded onto pumice by co-precipitation method to explore its adsorption performance and mechanism of ammonia nitrogen. The effects of initial ammonia concentration, initial pH value and co-existing ions (H⁺, Na⁺, K⁺, Mg²⁺) on NHFO@pumice adsorption of ammonia nitrogen were investigated. SEM-EDS and XRD were used to characterize the morphology and structure of NHFO@honeycomb. The results show that the initial concentration of ammonia nitrogen is 20 mg/L and the pH value is around 7. The co-existing ions have an inhibitory effect on the adsorption of ammonia nitrogen, and the inhibitory strength is H⁺>Na⁺>K⁺>Mg²⁺. SEM-EDS, XRD, FTIR and other characterization methods confirmed that NHFO was successfully loaded on the honeycomb, and the adsorption process was consistent with Langmuir adsorption isotherm (R²=0.9886) and quasi second-order kinetic model (R²=0.9969). The mechanism of ammonia nitrogen adsorption mainly includes electrostatic interaction of hydroxyl group and NH₄⁺, ion exchange and pore adsorption. This study provides a theoretical basis for the treatment of ammonia-nitrogen water by adsorption.
- pumice /
- nano hydrous iron oxide /
- adsorption /
- ammonia nitrogen /
- mechanisms

HTML全文

图 1 ((a), (b))天然蜂巢石SEM图像；((c), (d)) 纳米水合氧化铁(NHFO)@蜂巢石SEM图像；(e) NHFO@蜂巢石EDS分析C、N、O、Fe元素分布图

Figure 1. ((a), (b)) SEM images of pumice; ((c), (d)) SEM images of nano hydrous iron oxide (NHFO)@pumice; (e) EDS images of NHFO@pumice distribution of C, N, O and Fe elements

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图 2 蜂巢石、NHFO@蜂巢石XRD图谱

Figure 2. XRD patterns of natural pumice and NHFO@pumice

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图 3 pH对NHFO@蜂巢石吸附氨氮的影响

Figure 3. Effect of pH on NHFO@pumice adsorption of ammonia nitrogen

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图 4 氨氮初始浓度对NHFO@蜂巢石吸附氨氮的影响

Figure 4. Effect of initial ammonia nitrogen concentration on NHFO@pumice adsorption of ammonia nitrogen

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图 5 共存离子对NHFO@蜂巢石吸附氨氮的影响

Figure 5. Influence of coexisting ions on NHFO@pumice adsorption of ammonia nitrogen

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图 6 NHFO@蜂巢石吸附等温线模型

Figure 6. Adsorption isotherm model of NHFO@pumice

q_t—Instantaneous adsorption capacity; C_e—Concentration

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图 7 NHFO@蜂巢石吸附动力学模型

Figure 7. Adsorption kinetics model of NHFO@pumice

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图 8 NHFO@蜂巢石傅里叶变换红外图谱

Figure 8. FTIR spectra of NHFO@pumice

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图 9 (a) NHFO@蜂巢石吸附前后XPS全谱图；(b) NHFO@蜂巢石吸附前后Na1s图谱

Figure 9. (a) XPS spectra before and after NHFO@pumice adsorption; (b) Na1s spectra before and after NHFO@pumice adsorption

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图 10 NHFO@蜂巢石吸附氨氮机制

Figure 10. Adsorption mechanism of NHFO@pumice

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表 1 NHFO@蜂巢石复合材料吸附等温线模型参数

Table 1. Adsorption isotherm model parameters of NHFO@pumice stone composites

Langmuir			Freundich
q_m/(mg·g⁻¹)	K_L	R²	K_F	n	R²
4.5393±0.0692	0.2277±0.0189	0.9886	1.7285±0.2401	0.2066±0.0341	0.8560
Notes: q_m—Maximal adsorption capacity; K_L—Langmuir constant; K_F—Freundlich constant; n—The constant of the adsorption model; R²—Variance.

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表 2 NHFO@蜂巢石复合材料吸附动力学模型参数

Table 2. Adsorption kinetics model parameters of NHFO@pumice stone composites

Pseudo-first-order	q_m	k₁	R²
Pseudo-first-order	3.7459±0.0919	0.0137±0.0012	0.9678
Pseudo-second-order	q_m	k₂	R²
Pseudo-second-order	4.2650±0.0451	0.0039±0.0002	0.9969
Elovich	a	b	R²
Elovich	0.0484±0.0267	−0.6115±0.0083	0.8786
Notes: k₁—Pseudo-first-order kinetic constant; k₂—Pseudo-second-order kinetic constant; a—Initial adsorption rate (mg/(g·min)); b—Desorption constant.

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表 3 NHFO@蜂巢石吸附前后成分相对含量(XPS全谱)

Table 3. Relative contents of NHFO@pumice before and after adsorption (Full spectrum of XPS)

Sample	Atomic ratio/at%
Sample	C	N	O	Fe	Al	Si	Na
NHFO@pumice-before adsorption	39.30	0.49	42.50	1.41	5.10	6.60	2.43
NHFO@pumice-after adsorption	36.82	2.73	43.15	2.51	4.73	5.92	1.04

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