Lanthanum and zirconium modified rape stalk and water chestnut shell removing phosphorus from swine wastewater
ZHOU Keren1,, ZHANG Shirong1,,, PENG Yaxi1, FENG Can1, WANG Yating2 1.College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China 2.Chengdu Academy of Environmental Sciences, Chengdu 610072, China
Abstract:Phosphorus is one of the important factors causing eutrophication of surface water, and the key to remove phosphorus from wastewater is to select high-efficiency and low-cost adsorption materials. Based on this, lanthanum and zirconium modified rape stalks (La-BC, Zr-BC) and water chestnut shells (La-TN, Zr-TN) were prepared by coprecipitation method, and their adsorption and removal of phosphorus in the simulated wastewater were investigated. The effects of different dosages of modified materials, pH of solution, initial concentration of phosphorus and reaction time on phosphorus adsorption characteristics were investigated, respectively. FT-IR and SEM-EDS characterization results showed that lanthanum and zirconium were successfully loaded on the surfaces of rape stalks and water chestnut shells. The adsorption capacity of La-TN, La-BC, Zr-TN and Zr-BC to phosphorus decreased exponentially with the increase of the dosage of modified materials, and their maximum adsorption capacities were 12.49, 11.41, 6.85 and 6.83 ${\rm{m}}{\rm{g}} \cdot {{\rm{g}}}^{-1}$, respectively. With the increase of pH, the adsorption capacity of lanthanum modified materials to phosphorus increased first and then decreased, while the adsorption capacity of zirconium modified materials decreased in power function. It was more suitable to describe the adsorption kinetics of the four modified materials using the Elovich model, and the Freundlich model was better to fit the adsorption isotherms. The adsorption capacities of La-BC, Zr-BC, La-TN, Zr-TN in swine wastewater were 14.82, 10.36, 15.41 and 8.91 ${\rm{m}}{\rm{g}} \cdot {{\rm{g}}}^{-1}$, respectively, which increased by 34, 20, 53 and 37 times of the pristine materials, indicating that the four modified materials had potential for phosphorus removal in swine wastewater. The results of this study can provide some references for the removal of phosphorus from wastewater and the recycling of agricultural wastes. Key words:phosphorus/ rape stalk/ water chestnut shell/ agricultural wastes/ modify.
图1材料改性前后SEM图谱及EDS能谱 Figure1.SEM images and EDS of materials before and after modification
表16种吸附材料表面元素质量分数 Table1.Surface element mass percentages of 6 types of adsorption materials %
吸附剂
C
O
La
Zr
Ca
BC
65.56
27.91
0
0
6.53
La-BC
44.52
26.00
29.47
0
0
Zr-BC
16.93
21.65
0
61.42
0
TN
77.76
22.24
0
0
0
La-TN
10.90
22.40
66.70
0
0
Zr-TN
10.14
11.49
0
78.37
0
吸附剂
C
O
La
Zr
Ca
BC
65.56
27.91
0
0
6.53
La-BC
44.52
26.00
29.47
0
0
Zr-BC
16.93
21.65
0
61.42
0
TN
77.76
22.24
0
0
0
La-TN
10.90
22.40
66.70
0
0
Zr-TN
10.14
11.49
0
78.37
0
下载: 导出CSV 表24种改性材料对模拟废水中磷吸附的准一级动力学模型、准二级动力学模型及叶诺维奇模型相关参数 Table2.Parameters of pseudo-first-order, pseudo-second-order and Elovich models of phosphorus adsorption insimulated wastewater by four modified materials
吸附剂
准一级动力学模型
准二级动力学模型
叶诺维奇模型
K1
qe
R2
K2
qe
R2
$\alpha_{\rm{s}}$
$\beta_{\rm{s}}$
R2
La-TN
0.04
13.31
0.630
0.008
13.74
0.964
25404
1.24
0.967
Zr-TN
0.02
7.82
0.921
0.005
8.09
0.977
20.87
1.25
0.982
La-BC
0.05
11.66
0.875
0.008
12.16
0.930
125.04
0.90
0.959
Zr-BC
0.04
7.06
0.808
0.008
7.60
0.915
4.69
1.02
0.978
吸附剂
准一级动力学模型
准二级动力学模型
叶诺维奇模型
K1
qe
R2
K2
qe
R2
$\alpha_{\rm{s}}$
$\beta_{\rm{s}}$
R2
La-TN
0.04
13.31
0.630
0.008
13.74
0.964
25404
1.24
0.967
Zr-TN
0.02
7.82
0.921
0.005
8.09
0.977
20.87
1.25
0.982
La-BC
0.05
11.66
0.875
0.008
12.16
0.930
125.04
0.90
0.959
Zr-BC
0.04
7.06
0.808
0.008
7.60
0.915
4.69
1.02
0.978
下载: 导出CSV 表34种改性材料对模拟废水中磷的等温吸附模型 Table3.Isothermal adsorption models parameters of four modified materials toward phosphorus in simulated wastewater
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1.College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China 2.Chengdu Academy of Environmental Sciences, Chengdu 610072, China Received Date: 2020-02-26 Accepted Date: 2020-05-16 Available Online: 2021-01-13 Keywords:phosphorus/ rape stalk/ water chestnut shell/ agricultural wastes/ modify Abstract:Phosphorus is one of the important factors causing eutrophication of surface water, and the key to remove phosphorus from wastewater is to select high-efficiency and low-cost adsorption materials. Based on this, lanthanum and zirconium modified rape stalks (La-BC, Zr-BC) and water chestnut shells (La-TN, Zr-TN) were prepared by coprecipitation method, and their adsorption and removal of phosphorus in the simulated wastewater were investigated. The effects of different dosages of modified materials, pH of solution, initial concentration of phosphorus and reaction time on phosphorus adsorption characteristics were investigated, respectively. FT-IR and SEM-EDS characterization results showed that lanthanum and zirconium were successfully loaded on the surfaces of rape stalks and water chestnut shells. The adsorption capacity of La-TN, La-BC, Zr-TN and Zr-BC to phosphorus decreased exponentially with the increase of the dosage of modified materials, and their maximum adsorption capacities were 12.49, 11.41, 6.85 and 6.83 ${\rm{m}}{\rm{g}} \cdot {{\rm{g}}}^{-1}$, respectively. With the increase of pH, the adsorption capacity of lanthanum modified materials to phosphorus increased first and then decreased, while the adsorption capacity of zirconium modified materials decreased in power function. It was more suitable to describe the adsorption kinetics of the four modified materials using the Elovich model, and the Freundlich model was better to fit the adsorption isotherms. The adsorption capacities of La-BC, Zr-BC, La-TN, Zr-TN in swine wastewater were 14.82, 10.36, 15.41 and 8.91 ${\rm{m}}{\rm{g}} \cdot {{\rm{g}}}^{-1}$, respectively, which increased by 34, 20, 53 and 37 times of the pristine materials, indicating that the four modified materials had potential for phosphorus removal in swine wastewater. The results of this study can provide some references for the removal of phosphorus from wastewater and the recycling of agricultural wastes.
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