A surface plasmon resonance(SPR)sensor with Ag/PbS/GR hybrid nanostructure has been proposed for the diagnostics of liquid phase samples.Here Ag/PbS/GR hybrid nanostructure is designed as an asymmetric MIM waveguide f...A surface plasmon resonance(SPR)sensor with Ag/PbS/GR hybrid nanostructure has been proposed for the diagnostics of liquid phase samples.Here Ag/PbS/GR hybrid nanostructure is designed as an asymmetric MIM waveguide for surface plasmon.Due to the guided wave SPR(GWSPR)modes,the index of the liquid phase samples can be measured more accurately than the conventional SPR sensors.Numerical simulation results show that the sensitivity of the sensor is about 5 times higher than the conventional SPR sensors.The origin of the enhancement mechanism is the combination of GWSPR in the Ag/PbS/GR hybrid nanostructure which enables the surface plasmon to spread along the PbS layer.In Ag/PbS/GR hybrid nanostructure,the electric field is concentrated mostly in the PbS layer,and the enhancement of the field intensity is nearly30%.展开更多
In this study, effects of water conditions （flooded, wet, or dry） and eggshell dosages （0, 0.1, 1.0, and 10.0 g/kg soil, respectively） on pH variation, content of unavailable state of heavy metals, form of heavy m...In this study, effects of water conditions （flooded, wet, or dry） and eggshell dosages （0, 0.1, 1.0, and 10.0 g/kg soil, respectively） on pH variation, content of unavailable state of heavy metals, form of heavy metals, and available nutritious element calcium （Ca） in acid soils contaminated with heavy metals were investigated, respectively. The soil samples were continuously cultivated indoors and analyzed by toxicity characteristic leaching procedure and community bureau of reference （BCR） sequential extraction procedure. The results showed that the addition of eggshell could effectively improve the pH of acid soil and increase it to neutral level. Moreover, the contents of unavailable state of heavy metals Cu, Zn, and Cd increased significantly. Furthermore, when the soil was cultivated under the flooded condition with 1.0 g/kg eggshell, the unavailable state ofCu, Zn, and Cd increased the most, and these heavy metals were transformed into residual state. On the other hand, the amount of available state of Ca increased to 432.19 from 73.34 mg/kg with the addition of 1.0 g/kg eggshell, which indicated that the addition of eggshell dramatically improved the available state of Ca. Therefore, eggshell could ameliorate the soil environment as it led to the decrease of available heavy metals and improvement of fertilization effectively. In a word, this study indicates that the addition of eggshell would be a new potential method for remediation of acid field soils contaminated with heavy metals.展开更多
基金supported by Anhui University Natural Science Research Project,China(KJ2015A153)National Natural Science Foundation of China (11304002)
文摘A surface plasmon resonance(SPR)sensor with Ag/PbS/GR hybrid nanostructure has been proposed for the diagnostics of liquid phase samples.Here Ag/PbS/GR hybrid nanostructure is designed as an asymmetric MIM waveguide for surface plasmon.Due to the guided wave SPR(GWSPR)modes,the index of the liquid phase samples can be measured more accurately than the conventional SPR sensors.Numerical simulation results show that the sensitivity of the sensor is about 5 times higher than the conventional SPR sensors.The origin of the enhancement mechanism is the combination of GWSPR in the Ag/PbS/GR hybrid nanostructure which enables the surface plasmon to spread along the PbS layer.In Ag/PbS/GR hybrid nanostructure,the electric field is concentrated mostly in the PbS layer,and the enhancement of the field intensity is nearly30%.
文摘In this study, effects of water conditions （flooded, wet, or dry） and eggshell dosages （0, 0.1, 1.0, and 10.0 g/kg soil, respectively） on pH variation, content of unavailable state of heavy metals, form of heavy metals, and available nutritious element calcium （Ca） in acid soils contaminated with heavy metals were investigated, respectively. The soil samples were continuously cultivated indoors and analyzed by toxicity characteristic leaching procedure and community bureau of reference （BCR） sequential extraction procedure. The results showed that the addition of eggshell could effectively improve the pH of acid soil and increase it to neutral level. Moreover, the contents of unavailable state of heavy metals Cu, Zn, and Cd increased significantly. Furthermore, when the soil was cultivated under the flooded condition with 1.0 g/kg eggshell, the unavailable state ofCu, Zn, and Cd increased the most, and these heavy metals were transformed into residual state. On the other hand, the amount of available state of Ca increased to 432.19 from 73.34 mg/kg with the addition of 1.0 g/kg eggshell, which indicated that the addition of eggshell dramatically improved the available state of Ca. Therefore, eggshell could ameliorate the soil environment as it led to the decrease of available heavy metals and improvement of fertilization effectively. In a word, this study indicates that the addition of eggshell would be a new potential method for remediation of acid field soils contaminated with heavy metals.
