The role of the hybridization between Mn 3d and O 2p orbitals in the existence of the Griffiths phase in La0.85Ca0.15MnO3.

Favourable conditions for the existence of the Griffiths phase in the La0.85Ca0.15MnO3 compound are experimentally investigated in terms of electronic and lattice structure by temperature-dependent x-ray absorption spectroscopy, valence band photoemission spectroscopy, and x-ray diffraction experiments.

[Coupling AFM fluid imaging with micro-flocculation filtration process for the technological optimization].

Atomic force microscope (AFM) fluid imaging was applied to the study of micro-flocculation filtration process and the optimization of micro-flocculation time and the agitation intensity of G values. It can be concluded that AFM fluid imaging proves to be a promising tool in the observation and characterization of floc morphology and the dynamic coagulation processes under aqueous environmental conditions. Through the use of AFM fluid imaging technique, optimized conditions for micro-flocculation time of 2 min and the agitation intensity (G value) of 100 s(-1) were obtained in the treatment of dye-printing industrial tailing wastewater by the micro-flocculation filtration process with a good performance.

[Effects of pH value on the adsorption and degradation of 2, 4-DCP by nanoscale zero-valent iron].

To evaluate the effect of pH on the degradation of 2,4-DCP by zero-valent iron nanoparticles (with the particle size of 30-40 nm in diameter) samples were taken for TEM, SEM-EDX, and ICP-OES analysis and investigated on the particle morphology changes and 2,4-DCP removal under different pH conditions. It is shown that iron nanoparticles agglomerate from individual particles and tiny clusters into massive aggregate assemblies with their surfaces oxidized and coated by the needle-like rotten iron oxide products (FeOOH) in the degradation process, which will block up a further reaction of 2,4-DCP dechlorination, while the low pH value condition in acidic system can effectively suppress particles aggregation and the surface oxidation, although iron loss in the solid phase is somehow inevitable. Large quantity of Fe2+ ions soaked out from iron nanoparticles significantly promote 2,4-DCP removal by reduction, and the solution pH tends to go up in the reaction process.

[Comparative study on the coagulation of PACl with different contents of aluminum polymeric species].

Based on the Ferron assay of aluminum species, jar test and filterability index, four types of PACl products of Al(a),, Al(b), Al(c), and Al(abc) are investigated on raw water samples from settling tank of water plant, which denote the different dominant aluminum species of AlCl3 for monomer or oligomer, PACl with high Al13 contents for mediate polymer of Al(b), PACl with high Al(c) contents for aluminum high polymer or Al (OH)3 sol, and industrial PACl for the mixed aluminum polymeric species with variety of alkalinity of Al(a), Al(b) and Al(c), respectively. Multiple parameters including the residual turbidity, UV254, particles removal, filterability index as well as the floc formation kinetics are monitored to make a comprehensive evaluation of their coagulation and settling-filtration performance. It indicates that PACl with high Al(b) contents demonstrate their predominant ability in the turbidity removal, whereas PACl with high Al(c) contents prefer to cutting down the particles and UV254.

Comparative study on the removal technologies of 2-methylisoborneol (MIB) in drinking water.

Removal of 2-methylisoborneol (MIB) in drinking water by ozone, powdered activated carbon (PAC), potassium permanganate and potassium ferrate was investigated. The adsorption kinetics of MIB by both wood-based and coat-based PACs show that main removal of MIB occurs within contact time of 1 h. Compared with the wood-based PAC, the coat-based PAC evidently improved the removal efficiency of MIB.