Preparation and photocatalytic activity of B,Y co-doped nanosized TiO2 catalyst

The catalysts of un-doped, single-doped and co-doped titanium dioxide (TiO2) powders were prepared by sol-gel method with Ti(OC4H9)4 as a raw material. The photocatalytic decomposition of phenol in aqueous solution under UV light was used as a probe reaction to evaluate their photocatalytic activities. The effects of B, Y co-doping on the crystallite sizes, crystal pattern, surface composition, and optical property of the catalyst were investigated by thermogravimetric differential thermal analysis, X-ray d...     

活性炭负载Fe(Ⅲ)氧化物去除水中的磷酸根

利用活性炭负载铁氧化物制备了复合吸附剂,并用于水中磷酸根的去除.采用BET,SEM及XRD等手段对复合吸附剂的物理化学特性进行了表征,用静态吸附实验方法比较研究了复合吸附剂和活性炭从水溶液中吸附磷酸根的性质.结果表明:复合吸附剂具有快的吸附速度和高的吸附容量,其吸附磷酸根的性质受溶液pH值、铁含量及阴离子浓度的影响.在pH=3.0时,复合吸附剂对磷酸根的吸附容量为98.39 mg/g,而活性炭为78.90 mg/g.相比之下,Freundlich模型比Langmuir模型能更好地描述复合吸附剂和活性炭对磷酸根的吸附过程;而Lagergren二级方程却能很好地描述复合吸附剂对磷酸根的吸附动力学.水合氧化铁/活性炭复合吸附剂吸附磷酸根为吸热过程.     

leapfrog对某矿区各锌矿体的圈定简析

用leapfrog对某矿区圈定矿体实体模型,并对矿体模型进行距离幂次反比法估算资源量。资源量分级据钻孔与矿体相交点的距离进行划分,小于160m的圈成探明资源量,160至320m的圈成控制资源量,320至640m的圈成推断资源量;工程间距无限外推即采用见矿工程点向外平推80m圈成推断资源量。本次资源量估算范围除了北矿带东段采矿权外还新增了Ⅱ区的矿体。本次收集的品位表格中总共有2623个样品具有Zn品位值,但对应具有Pb品位值得样品只有1144个样品。由于Pb的数据很少,所以本次只对Zn矿体进行实体圈定并估算资源量,边界品位采用矿山生产的边界品位,即Zn的边界品位为0.6%,Pb品位未参与实体圈定和资源量估算。