黄土中不同碳酸盐—磷酸盐比例对P形态的影响及其作用机制
发布时间：2021-01-25 15:17
发生在矿物/水界面的化学反应对营养物质和污染物在水环境中的迁移和生物有效性有重要作用。磷酸盐（P）是植物生长的必需营养元素,由于潜在磷矿资源短缺和对磷肥料需求的快速增长,P被定义为消失的养分。同时应用XRD、SEM/EDX、 FTIR及MAS-NMR等技术手段研究不同碳酸盐和磷酸盐配比对碳酸钙形成转化的影响。使用ESEM和XPS研究了碳酸盐与大量磷酸盐结合对含碳酸盐和不含碳酸盐的黄土以及P形态的影响。主要结果如下：1.磷酸盐在方解石矿物表面的吸附与沉淀磷酸盐可以在方解石矿物表面发生吸附或沉淀反应,可能是因为在碱性条件下磷酸盐有极强的粘结作用。在低P浓度（8.2—32.8μM）条件下,磷酸盐会快速吸附在方解石表面,随后吸附速率逐渐降低。使用Langmuir拟合pH8.0～9.0磷在方解石表面的结合量,其最大结合量q max分别为28.5,27.5和21μMP/g。使用ECOSAT进行形态分布计算表明在低磷浓度下（8.2-24.6μM）主要以吸附反应为主,并且随着磷酸盐浓度的增加吸附量逐渐降低,最终发生沉淀。在pH8.0时,矿物/水界面的主要机理是吸附,而在高磷浓度（49.3和57.5gM...
【文章来源】：华中农业大学湖北省 211工程院校 教育部直属院校
【文章页数】：72 页
【学位级别】：博士
【文章目录】：
ABSTRACT
摘要
ABBREVIATIONS
1 INTRODUCTION
1.1 Adsorption/precipitation of phosphate on calcite
1.1.1 Factors effects the phosphate binding ion exchange on pure calcite
1.2 Interaction between calcium and phosphate
1.2.1 Factors effects the transformation of P and calcium into calcium orthophosphate
1.2.2 Transformation mechanisms of P and calcium into calcium orthophosphates
1.3 Inorganic phosphate binding with components of soil
1.3.1 Factors affect the binding amounts of inorganic phosphate on loess soil
1.3.2 Soil constituents
1.4 Rationale and significance
2 EXPERIMENTAL PROCEDURE
2.1 Water and chemicals
2.2 Syntheses method
2.2.1 Calcite
2.2.2 Phosphate and carbonate ratios on the transformation of calcium orthophosphates
2.3 Soil sample
2.4 Binding studies
2.4.1 Calcite
2.4.2 Soil
2.5 Characterization
2.5.1 X-ray diffraction
2.5.2 Scanning electron microscopy with energy-dispersive X-ray spectroscopy
2.5.3 Environmental scanning electron microscope with Energy-dispersive X-ray spectroscopy
2.5.4 Fourier transform infrared spectroscopy
2.5.5 Magic angle spinning nuclear magnetic resonance
2.5.6 X-ray photoelectron spectroscopy
3 RESULTS
3.1 Calcite
3.1.1 X-ray diffraction
3.1.2 Scanning electron microscopy with energy dispersed X-ray
3.1.3 Zeta potential and specific surface area（SSA）
3.2 Binding amounts of inorganic phosphate on calcite
3.3 Effect of P and carbonate ratios on the transformation of calcium orthophosphates
3.3.1 Types of synthesized products
3.3.2 Morphology and elemental distribution of synthezied products
3.3.3 Infrared spectrum of synthesized products
3.3.4 P speciation of synthesized products
3.4 Binding amounts of P with components of soil
3.4.1 Types of soil
3.4.2 Phosphorus speciation in tested samples
3.4.3 Surface characterization using XPS
3.4.4 Morphology and elemental distribution of tested samples
4 DISCUSSIONS
4.1 Binding amounts of phosphate on calcite
4.1.1 Summary
4.2 Effect of carbonate and phosphate on the transformation of calcium orthophosphates
4.2.1 Summary
4.3 Binding amounts of P with components of loess
4.3.1 Summary
5 CONCLUSION
INNOVIATION
PROSPECT
REFERENCES
APPENDIX
ACKNOWLEDGEMENT
【参考文献】：
期刊论文
[1]Dynamics of crystallization and dissolution of calcium orthophosphates at the near-molecular level[J]. WANG LiJun1,LU JianWei1,XU FangSen1 & ZHANG FuSuo2 1 College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China;2 College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193,China. Chinese Science Bulletin. 2011(08)
[2]Inorganic Phosphorus Fractions and Phosphorus Availability in a Calcareous Soil Receiving 21-Year Superphosphate Application[J]. WANG Jun1,2, LIU Wen-Zhao1,2, MU Han-Feng2 and DANG Ting-Hui1 1State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100 (China) 2College of Urban and Environment, Northwest University, Xi’an 710127 (China). Pedosphere. 2010(03)
本文编号：2999453
【文章来源】：华中农业大学湖北省 211工程院校 教育部直属院校
【文章页数】：72 页
【学位级别】：博士
【文章目录】：
ABSTRACT
摘要
ABBREVIATIONS
1 INTRODUCTION
1.1 Adsorption/precipitation of phosphate on calcite
1.1.1 Factors effects the phosphate binding ion exchange on pure calcite
1.2 Interaction between calcium and phosphate
1.2.1 Factors effects the transformation of P and calcium into calcium orthophosphate
1.2.2 Transformation mechanisms of P and calcium into calcium orthophosphates
1.3 Inorganic phosphate binding with components of soil
1.3.1 Factors affect the binding amounts of inorganic phosphate on loess soil
1.3.2 Soil constituents
1.4 Rationale and significance
2 EXPERIMENTAL PROCEDURE
2.1 Water and chemicals
2.2 Syntheses method
2.2.1 Calcite
2.2.2 Phosphate and carbonate ratios on the transformation of calcium orthophosphates
2.3 Soil sample
2.4 Binding studies
2.4.1 Calcite
2.4.2 Soil
2.5 Characterization
2.5.1 X-ray diffraction
2.5.2 Scanning electron microscopy with energy-dispersive X-ray spectroscopy
2.5.3 Environmental scanning electron microscope with Energy-dispersive X-ray spectroscopy
2.5.4 Fourier transform infrared spectroscopy
2.5.5 Magic angle spinning nuclear magnetic resonance
2.5.6 X-ray photoelectron spectroscopy
3 RESULTS
3.1 Calcite
3.1.1 X-ray diffraction
3.1.2 Scanning electron microscopy with energy dispersed X-ray
3.1.3 Zeta potential and specific surface area（SSA）
3.2 Binding amounts of inorganic phosphate on calcite
3.3 Effect of P and carbonate ratios on the transformation of calcium orthophosphates
3.3.1 Types of synthesized products
3.3.2 Morphology and elemental distribution of synthezied products
3.3.3 Infrared spectrum of synthesized products
3.3.4 P speciation of synthesized products
3.4 Binding amounts of P with components of soil
3.4.1 Types of soil
3.4.2 Phosphorus speciation in tested samples
3.4.3 Surface characterization using XPS
3.4.4 Morphology and elemental distribution of tested samples
4 DISCUSSIONS
4.1 Binding amounts of phosphate on calcite
4.1.1 Summary
4.2 Effect of carbonate and phosphate on the transformation of calcium orthophosphates
4.2.1 Summary
4.3 Binding amounts of P with components of loess
4.3.1 Summary
5 CONCLUSION
INNOVIATION
PROSPECT
REFERENCES
APPENDIX
ACKNOWLEDGEMENT
【参考文献】：
期刊论文
[1]Dynamics of crystallization and dissolution of calcium orthophosphates at the near-molecular level[J]. WANG LiJun1,LU JianWei1,XU FangSen1 & ZHANG FuSuo2 1 College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China;2 College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193,China. Chinese Science Bulletin. 2011(08)
[2]Inorganic Phosphorus Fractions and Phosphorus Availability in a Calcareous Soil Receiving 21-Year Superphosphate Application[J]. WANG Jun1,2, LIU Wen-Zhao1,2, MU Han-Feng2 and DANG Ting-Hui1 1State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100 (China) 2College of Urban and Environment, Northwest University, Xi’an 710127 (China). Pedosphere. 2010(03)
本文编号：2999453
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