以硅藻土为原料,利用铁尾矿的酸浸液对其进行改性,制备了改性硅藻土,利用XRD、XRF对改性硅藻土进行了表征,并研究了改性硅藻土对废水中磷的吸附行为。结果表明,改性硅藻土的物相组成、化学组成及含量均发生了改变;改性硅藻土对磷的吸附...以硅藻土为原料,利用铁尾矿的酸浸液对其进行改性,制备了改性硅藻土,利用XRD、XRF对改性硅藻土进行了表征,并研究了改性硅藻土对废水中磷的吸附行为。结果表明,改性硅藻土的物相组成、化学组成及含量均发生了改变;改性硅藻土对磷的吸附效果好于硅藻土原土;20 min为吸附平衡时间;对于50 m L 5mg/L的含磷废水,改性硅藻土投加量1.2 g,磷去除率可达81.08%;酸性环境有利于磷的吸附;温度对改性硅藻土吸附磷影响较小;改性硅藻土对磷的吸附行为较符合Freundlich吸附等温式,且为优惠吸附。展开更多
The Kenya Rift Valley is relatively prone to underground erosion ground fissures and associated disasters,which gravely hinder local engineering construction and economic development.In this research,we performed fiel...The Kenya Rift Valley is relatively prone to underground erosion ground fissures and associated disasters,which gravely hinder local engineering construction and economic development.In this research,we performed field and experimental studies on ground fissures in the Kenya Rift Valley area,and determined the structural characteristics of underground erosion fissures.Based on a geological survey of the area,we generalized a geological model for typical ground fissures and reproduced the intermediate process of ground fissure propagation using a large-scale physical model test.Further,the development process of underground erosion fissures were categorized into four stages:uniform infiltration,preferential infiltration,cavity expansion,and collapse formation stages.During the development of underground erosion fissures,water content was distributed symmetrically along the fissures,and these fissures acted as the primary infiltration paths of water.When the ground collapsed,the increase in negative pore water pressure was greater,whereas the increase in positive pore water pressure was less in the shallow soil;moreover,in the deep soil,the increase in positive pore water pressure was greater than that of negative pore water pressure.Additionally,the earth pressure increment initially increased and then decreased with the development of erosion.During underground erosion collapse,the water content and pore water pressure appeared to increase and decrease rapidly.These results can be employed to predict the occurrence of underground erosion ground fissures and the resulting soil collapse.展开更多
文摘以硅藻土为原料,利用铁尾矿的酸浸液对其进行改性,制备了改性硅藻土,利用XRD、XRF对改性硅藻土进行了表征,并研究了改性硅藻土对废水中磷的吸附行为。结果表明,改性硅藻土的物相组成、化学组成及含量均发生了改变;改性硅藻土对磷的吸附效果好于硅藻土原土;20 min为吸附平衡时间;对于50 m L 5mg/L的含磷废水,改性硅藻土投加量1.2 g,磷去除率可达81.08%;酸性环境有利于磷的吸附;温度对改性硅藻土吸附磷影响较小;改性硅藻土对磷的吸附行为较符合Freundlich吸附等温式,且为优惠吸附。
基金supported by the National Science Foundation of China(No.41920104010,41877250,and 41807243)。
文摘The Kenya Rift Valley is relatively prone to underground erosion ground fissures and associated disasters,which gravely hinder local engineering construction and economic development.In this research,we performed field and experimental studies on ground fissures in the Kenya Rift Valley area,and determined the structural characteristics of underground erosion fissures.Based on a geological survey of the area,we generalized a geological model for typical ground fissures and reproduced the intermediate process of ground fissure propagation using a large-scale physical model test.Further,the development process of underground erosion fissures were categorized into four stages:uniform infiltration,preferential infiltration,cavity expansion,and collapse formation stages.During the development of underground erosion fissures,water content was distributed symmetrically along the fissures,and these fissures acted as the primary infiltration paths of water.When the ground collapsed,the increase in negative pore water pressure was greater,whereas the increase in positive pore water pressure was less in the shallow soil;moreover,in the deep soil,the increase in positive pore water pressure was greater than that of negative pore water pressure.Additionally,the earth pressure increment initially increased and then decreased with the development of erosion.During underground erosion collapse,the water content and pore water pressure appeared to increase and decrease rapidly.These results can be employed to predict the occurrence of underground erosion ground fissures and the resulting soil collapse.
