以毛竹杆材为植物模板,利用人工改性技术制备羟基磷灰石改性毛竹生物炭(hierarchical porous material of hydroxy-apatite coated on bamboo biochar,HAP@B),采用单因素实验考察了HAP@B对受铅污染土壤的钝化修复效果。实验结果表明:HA...以毛竹杆材为植物模板,利用人工改性技术制备羟基磷灰石改性毛竹生物炭(hierarchical porous material of hydroxy-apatite coated on bamboo biochar,HAP@B),采用单因素实验考察了HAP@B对受铅污染土壤的钝化修复效果。实验结果表明:HAP@B质量/土壤质量=0.5%、钝化修复时间15 d、HAP@B材料粒径20~100目(0.150~0.840 mm)、土壤含水率为30%及pH>4时,受铅污染土壤的钝化修复稳定率达90%以上。同时利用XRD、FT-IR、XPS及SEM对钝化修复机制进行了表征分析。通过表征分析得知,HAP@B材料钝化修复铅污染土壤主要途径是物理吸附、静电吸附、络合反应、离子交换和溶解沉淀作用。展开更多
In this study, series of hydroxyapatites containing Mg2+ and?CO2-3 are prepared by the precipitation method with independently varying concentrations of?CO2-3 and Mg2+. All the compounds are characterized by infrared ...In this study, series of hydroxyapatites containing Mg2+ and?CO2-3 are prepared by the precipitation method with independently varying concentrations of?CO2-3 and Mg2+. All the compounds are characterized by infrared spectra (IR);powder X-ray diffraction (PXRD) and elemental analysis. The physical analysis results show that the prepared compounds are pure B-type carbonate apatite. The presence of Mg2+ and?CO2-3 in the apatite cause the following effects on its physical properties: a decrease in a-dimension but no changes in c-dimension and a decrease in crystallinity as shown in XDR patterns and IR spectra. The results of the chemical analysis allow us to predict the predominant substitution mechanisms for the CO2-3 and the Mg2+ incorporations in the calcium hydroxyapatites and to calculate their relative contributions x, y and z. (II);?? 2. (IV);?? (V). Statistical studies of the results “multiple linear regression, analysis of variance (ANOVA) and t-test of the regression coefficients” allow us to determine and to test the mathematical model proposed. Finally, the present study makes it possible to write the general formula for these com-pounds.展开更多
文摘以毛竹杆材为植物模板,利用人工改性技术制备羟基磷灰石改性毛竹生物炭(hierarchical porous material of hydroxy-apatite coated on bamboo biochar,HAP@B),采用单因素实验考察了HAP@B对受铅污染土壤的钝化修复效果。实验结果表明:HAP@B质量/土壤质量=0.5%、钝化修复时间15 d、HAP@B材料粒径20~100目(0.150~0.840 mm)、土壤含水率为30%及pH>4时,受铅污染土壤的钝化修复稳定率达90%以上。同时利用XRD、FT-IR、XPS及SEM对钝化修复机制进行了表征分析。通过表征分析得知,HAP@B材料钝化修复铅污染土壤主要途径是物理吸附、静电吸附、络合反应、离子交换和溶解沉淀作用。
文摘In this study, series of hydroxyapatites containing Mg2+ and?CO2-3 are prepared by the precipitation method with independently varying concentrations of?CO2-3 and Mg2+. All the compounds are characterized by infrared spectra (IR);powder X-ray diffraction (PXRD) and elemental analysis. The physical analysis results show that the prepared compounds are pure B-type carbonate apatite. The presence of Mg2+ and?CO2-3 in the apatite cause the following effects on its physical properties: a decrease in a-dimension but no changes in c-dimension and a decrease in crystallinity as shown in XDR patterns and IR spectra. The results of the chemical analysis allow us to predict the predominant substitution mechanisms for the CO2-3 and the Mg2+ incorporations in the calcium hydroxyapatites and to calculate their relative contributions x, y and z. (II);?? 2. (IV);?? (V). Statistical studies of the results “multiple linear regression, analysis of variance (ANOVA) and t-test of the regression coefficients” allow us to determine and to test the mathematical model proposed. Finally, the present study makes it possible to write the general formula for these com-pounds.
