Influences of ultrasound on the performance of phosphorus removal using the LaCO3OH-modified montmorillonite

doi:10.19965/j.cnki.iwt.2022-1033

Abstract

Abstract:

Assisted with the ultrasound，the lanthanum（La）-based nanoparticle was deployed to modify montmorillonite（Mt）. Using the removal efficiency of phosphorus as the evaluation criteria，the response surface methodology was used to assess the influences of Mt concentration，ultrasonic power，and ultrasonic time on phosphorus removal. The optimized Mt composite（La-Mt） was further applied to investigate systematically the adsorption characteristics，including kinetics，isotherm，effect of coexisting anion，and regeneration performance. The results indicated that the Mt mass concentration was the most significant factor impacting phosphorus removal，followed by the ultrasonic power and ultrasonic time. With the condition that Mt mass concentration of 2.9 g/L，ultrasonic time of 14.239 min，and ultrasonic power of 281.469 W，the synthetic Mt composite demonstrated the best removal rate close to 100%. Adsorption of phosphorus on La-Mt was well fitted by the pseudo second-order mode and the Freundlich mode，suggesting a multilayer chemical adsorption process. Except the high concentration SO₄ ^2-，the Cl^-，NO₃ ^-，and HCO₃ ^- showed negligible influence on phosphorus removal，indicating the favorable anti-interfering property. Compared to NaOH，Na₂CO₃ was more suitable for the regeneration of the saturated La-Mt，where the removal rate of 98% was obtained even after regenerated for 4 times when 0.1 mol/L Na₂CO₃ was used.

Key words: lanthanum, montmorillonite, ultrasound, modification, phosphorus removal

摘要：

在超声作用下，采用镧基纳米颗粒对蒙脱石进行改性，以除磷效率为评价指标，结合响应曲面实验设计从蒙脱石质量浓度、超声时间和超声功率三方面讨论了合成条件对改性蒙脱石除磷特性的影响。对优选的改性蒙脱石开展了包括吸附动力学、等温线、共存离子影响以及再生性等方面的系统性吸附探究。结果表明，蒙脱石质量浓度对磷去除率的影响最为显著，其次为超声功率和超声时间；当蒙脱石质量浓度为2.9 g/L、超声时间为14.239 min、超声功率为281.469 W时，制备的改性蒙脱石除磷效果最佳，磷去除率接近100%。优选的改性蒙脱石对磷酸根的吸附过程符合准二级动力学和Freundlich模型，属于多分子层的化学吸附。除高浓度SO₄ ^2-外，Cl^-、NO₃ ^-和HCO₃ ^-对改性蒙脱石除磷的影响较小，抗干扰性强。碳酸钠比氢氧化钠更适合吸附材料的再生，经0.1 mol/L的Na₂CO₃溶液再生4次后对磷的去除率仍高达98%。

关键词: 镧, 蒙脱石, 超声, 改性, 除磷

CLC Number:

X703.1

Hongkai CAO, Yunyun YANG, Wuhui LUO. Influences of ultrasound on the performance of phosphorus removal using the LaCO₃OH-modified montmorillonite[J]. Industrial Water Treatment, 2023, 43(9): 100-109.

曹宏凯, 杨云云, 罗武辉. 超声对LaCO₃OH改性蒙脱石除磷特性的影响研究[J]. 工业水处理, 2023, 43(9): 100-109.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2022-1033

https://www.iwt.cn/EN/Y2023/V43/I9/100

Figures/Tables 15

References 34

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影响因子	编码及水平
影响因子	-1	0	1
超声时间/min	2	9	16
超声功率/W	200	450	700
蒙脱石质量浓度/（g·L^-1）	1	3	5

影响因子	编码及水平
影响因子	-1	0	1
超声时间/min	2	9	16
超声功率/W	200	450	700
蒙脱石质量浓度/（g·L^-1）	1	3	5

编号	超声时间/min	超声功率/W	蒙脱石质量浓度/（g·L^-1）	吸附量/（mg·g^-1）
1	16	700	3	3.054
2	9	450	3	3.104
3	9	450	3	3.088
4	16	200	3	3.104
5	9	450	3	3.082
6	16	450	1	3.043
7	9	700	5	2.386
8	9	200	1	3.065
9	9	700	1	3.043
10	9	450	3	3.049
11	2	450	5	2.419
12	2	450	1	3.054
13	9	200	5	2.542
14	9	450	3	3.038
15	2	200	3	3.065
16	2	700	3	3.054
17	16	450	5	2.330

编号	超声时间/min	超声功率/W	蒙脱石质量浓度/（g·L^-1）	吸附量/（mg·g^-1）
1	16	700	3	3.054
2	9	450	3	3.104
3	9	450	3	3.088
4	16	200	3	3.104
5	9	450	3	3.082
6	16	450	1	3.043
7	9	700	5	2.386
8	9	200	1	3.065
9	9	700	1	3.043
10	9	450	3	3.049
11	2	450	5	2.419
12	2	450	1	3.054
13	9	200	5	2.542
14	9	450	3	3.038
15	2	200	3	3.065
16	2	700	3	3.054
17	16	450	5	2.330

项目	平方和	自由度	均方差	F	P	显著性
模型	1 343.94	9	149.33	96.09	<0.000 1	显著
超声时间（A）	0.567 1	1	0.567 1	0.364 9	0.564 8
超声功率（B）	7.18	1	7.18	4.62	0.068 6
蒙脱石质量浓度（C）	831.71	1	831.71	535.22	<0.000 1
AB	0.308	1	0.308	0.198 2	0.669 6
AC	1.59	1	1.59	1.02	0.345 8
BC	4.64	1	4.64	2.99	0.127 5
A²	2.74	1	2.74	1.76	0.225 7
B²	2.19	1	2.19	1.41	0.274 3
C²	489.93	1	489.93	315.28	<0.000 1
残差	10.88	7	1.55
失拟项	7.92	3	2.64	3.57	0.125 5	不显著
纯误差	2.96	4	0.74
总离差	1 354.81	16

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Influences of ultrasound on the performance of phosphorus removal using the LaCO₃OH-modified montmorillonite

超声对LaCO₃OH改性蒙脱石除磷特性的影响研究

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Freundlich模型				Langmuir模型
K _F	1/n	R ²		Q _max/（mg·g^-1）	K _L/（L·mg^-1）	R ²
23.765	0.314	0.917		95.203	0.213	0.894

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