Fei Shao - Academia.edu (original) (raw)
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Papers by Fei Shao
Materials Chemistry and Physics, 2005
The ternary undecatungsto chromoferrous heteropoly acid (HPA) H 6 Fe(H 2 O)CrW 11 O 39 Á 14H 2 O ... more The ternary undecatungsto chromoferrous heteropoly acid (HPA) H 6 Fe(H 2 O)CrW 11 O 39 Á 14H 2 O has been synthesized for the ®rst time by the stepwise acidi®cation and the stepwise addition of solutions of the component elements as well as ion exchanging±cooling method. The optimal proportion of the solutions of the component elements and the pH of the synthesis reaction are given. The product is characterized by chemical analysis, IR, UV, XRD and TG-DTA. The results of AC impedance measurement show that its proton conductivity is 3:89 Â 10 À3 S cm À1 at room temperature (208C). #
Desalination, 2011
Laboratory study of recovering HNO 3 solution from acidic effluents discharged by an electrodialy... more Laboratory study of recovering HNO 3 solution from acidic effluents discharged by an electrodialysis plant for extracting lithium from concentrated brine at East Taijinar Salt Lake, China, was conducted using diffusion dialysis (DD) with homogenous anion exchange membrane (DF120). The effects of concentrations of nitric acid and metal ions (including Li, Na, K, Mg, Ca) and water to spent acid flow rate (W/A) ratio on the performance of diffusion dialysis were investigated. Results indicated that acid recovery increased with the concentration of the feed. The membrane showed moderate monovalent permselectivity: divalent cations were more effectively retained as opposed to monovalent cations. The selectivity between metal and hydrogen ions were impaired by increasing W/A ratio. The acid recovery reached its maximum at 3.0 mol/L H + , demonstrating that the efficiency at feeding concentrations above 3.0 mol/L would be low for the DF120 membrane. The increase of salt content in the spent acid to 3.0 mol/L and above conceivably impaired the selectivity of the membrane. As such, acid recovery should be best performed with acid effluents with lower-to-medium salt content and hydrogen concentration. Also, a suitably lower W/A ratio should be adopted for effective acid recovery with low water cost.
Materials Chemistry and Physics, 2005
The ternary undecatungsto chromoferrous heteropoly acid (HPA) H 6 Fe(H 2 O)CrW 11 O 39 Á 14H 2 O ... more The ternary undecatungsto chromoferrous heteropoly acid (HPA) H 6 Fe(H 2 O)CrW 11 O 39 Á 14H 2 O has been synthesized for the ®rst time by the stepwise acidi®cation and the stepwise addition of solutions of the component elements as well as ion exchanging±cooling method. The optimal proportion of the solutions of the component elements and the pH of the synthesis reaction are given. The product is characterized by chemical analysis, IR, UV, XRD and TG-DTA. The results of AC impedance measurement show that its proton conductivity is 3:89 Â 10 À3 S cm À1 at room temperature (208C). #
Desalination, 2011
Laboratory study of recovering HNO 3 solution from acidic effluents discharged by an electrodialy... more Laboratory study of recovering HNO 3 solution from acidic effluents discharged by an electrodialysis plant for extracting lithium from concentrated brine at East Taijinar Salt Lake, China, was conducted using diffusion dialysis (DD) with homogenous anion exchange membrane (DF120). The effects of concentrations of nitric acid and metal ions (including Li, Na, K, Mg, Ca) and water to spent acid flow rate (W/A) ratio on the performance of diffusion dialysis were investigated. Results indicated that acid recovery increased with the concentration of the feed. The membrane showed moderate monovalent permselectivity: divalent cations were more effectively retained as opposed to monovalent cations. The selectivity between metal and hydrogen ions were impaired by increasing W/A ratio. The acid recovery reached its maximum at 3.0 mol/L H + , demonstrating that the efficiency at feeding concentrations above 3.0 mol/L would be low for the DF120 membrane. The increase of salt content in the spent acid to 3.0 mol/L and above conceivably impaired the selectivity of the membrane. As such, acid recovery should be best performed with acid effluents with lower-to-medium salt content and hydrogen concentration. Also, a suitably lower W/A ratio should be adopted for effective acid recovery with low water cost.