As the modified material, manganese oxide used in manufacturing composite is a hot research topic for environmental field. The manganese oxide modified composite was widely applied to water treatment, air fresheners, and so on. However, there were few reports on changing sorption characteristics of copper in soil with biochar-manganese oxide composite as adsorption materials. In the present study, the sorption batch experiments were employed to investigate the effects of biochar-manganese oxides composite on copper sorption in red soils. Freundlich equation was used to characterize the sorption of copper and calculate distribution coefficients. The results showed that the adsorption of Cu increased significantly by adding biochar-manganese oxides composite. Compared to the non biochar-manganese oxides composite system, the percentages of Cu adsorption increased 63.1%, 130%, 310%, and 509% with adding 0.5%, 1.0%, 2.0%, and 4.0% of biochar-manganese oxides, and their distribution coefficient (Kf) were 0.176, 0.286, 0.653, and 0.800, respectively. Among all dosages, the distribution coefficients were five times at 4.0% of biochar-manganese oxides higher than that at no adding composite materials. There was little effect on red soil pH value after adding biochar-manganese oxide composite, while, the CEC (Cation Exchange Capacity) were great influenced, especially, the dosage of biochar-manganese oxide composite was 4.0%, and CEC was 5.59 cmol.kg-1, increasing by 14.1%. The absorption peak were measured at 1034.63, 537.22, 471.45 cm-1 and the activity functional groups such as -OH, Mg-O, Si-O increased significantly in red soil after adding biochar-manganese oxide composite. Due to the complex such as Mg-O-Cu- and Si-O-Cu- were formed in red soil surface, the copper adsorption capacity of red soil was improved. It was demonstrated that biochar-manganese oxide composite could be considered as a promising material to immobilize heavy metal-contaminated soils.

采用溶胶-凝胶法制备了Fe3+/La3+共掺杂TiO2/玻璃电极,并将其作为工作电极,以饱和甘汞电极作参比电极,金属Ag片为对电极,0.1 mol/L Na2SO4为支持电解质,建立了三电极光电催化体系,对十二烷基苯磺酸钠配制的表面活性剂废水进行降解。实验表明,Freundlich等温吸附方程能很好地描述Fe3+/La3+共掺杂TiO2/玻璃电极对表面活性剂的吸附行为。实验同时考察了初始CODCr、外加偏压、电极面积、外加H2O2浓度以及涂覆层数对光电催化降解速率的影响,初步确定最佳的实验条件为:初始CODCr为20 mg/L,外加偏压为1.5 V,电极面积为44 cm2,外加H2O2浓度为55 mmol/L,涂覆层数为3层。

NiCr alloy coating was produced on the surface of 35CrMo steel with NiCr electrode by electro-spark deposition.The micro-hardness was obtained with hardness meter,the microstructure and chemical composition distribution and phase composition of the coating were investigated with scanning electron microscopy(SEM),energy dispersion spectrum(EDX) and X-ray diffraction(XRD) respectively.The results show that the micro-hardness of the coating is about 2 times as that of the substrate.Inter-diffusion takes place and metallurgy combination layer forms between the coating and the substrate,the main phase composition of the coating consists of NiCrFe and FeNi.