Effect of Combined Foliar Spray on Heavy Metals Accumulation in Facility Fruit Vegetables

In order to explore the effects of combined foliar spray which was prepared from potassium fulvate and Zn on heavy metal accumulations in three kinds of facility fruit vegetables,cucumber,tomato and white melon,the foliar spray was applied from fruit setting to maturation.The results showed that the combined foliar spray significantly promoted the absorption of Zn and Cu in the three fruit vegetables,blocked the absorption of Cr,As and Pb in cucumber,significantly blocked the absorption of Cd in white melon,blocked the absorption of Pb in white melon,and showed a tendency of blocking the absorption of heavy metals Cd and As in tomato.

Effects of rape straw and red mud on extractability and bioavailability of cadmium in a calcareous soil

Screening of cost-effective soil amendments is important to develop ＂in situ＂ remediation techniques for cadmium （Cd） contaminated soils. In this study, different soil amendments, including red mud, a by-product of the alumina industry, and acid-treated, nano-treated by nanoparticle milling, nano and acid-treated red muds, zeolite, corn straw, and rape straw, were evaluated to immobilize Cd in two added levels （2 and 5 mg Cd·kg^-1 soil） in a calcareous soil by single and sequential extractions and by cucumber （Cucumis sativus L.） pot experiments. Results indicated that cruciferous rape straw significantly decreased the concentrations of water soluble, extractable Cd in soils, and Cd in cucumber plants, and it was more effective than gramineous corn straw. Also, red mud generally decreased the extractability and bioavailability of Cd added to calcareous soils more effectively than zeolite. Furthermore, the efficiency of red mud could be increased by the treatment of nano-particle milling due to the increase in specific surface area of red mud. It is potential to use rape straw and red mud as soil amendments to develop a cost-effective and efficient ＂in situ＂ rernediation technology for Cd mildly contaminated calcareous soils.

Enhanced electrochemical performance and mechanism study of AgLi1/3Sn2/3O2 for lithium storage

Herein,AgLi1/3Sn2/3O2 with delafossite structure was prepared by treating the layered compound Li2 SnO3 with molten AgN03 via ion exchange of Li^+for Ag^+.The structure characterization and the electrochemical performance of AgLi1/3Sn2/3O2 was thoroughly investigated.AgLi1/3Sn2/3O2 is found to possess stacking lamellar morphology,which means small electrochemical impedance and so facilitates charge transfer kinetics during the cycling.Compared with Li2 Sn03,due to the introducing of excellent electrical conductivity of silver,AgLi1/3Sn2/3O2 exhibits improved electrochemical performance in terms of capacity,cycling stability and coulombic efficiency.The results show AgLi1/3Sn2/3O2 presents favorable specific capacity of 339 mAh/g at current density of 200 mA/g after 50 cycles and initial coulombic efficiency of 96%.Exsitu XRD analysis revealed the reaction mechanism of AgLi1/3Sn2/3O2 as an anode for lithium ion batteries.