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3. Effect of PH on PCP Remediation by Smectite Supported Pd0/Fe0

Author

Jun Li Han, Cun Yi Song, and Han Zhong Jia

Subjects
chemistry.chemical_compound, Reaction rate constant, chemistry, Environmental remediation, Inorganic chemistry, Rate change, Environmental engineering, Reactivity (chemistry), General Medicine, Reaction system, Clay minerals, Corrosion, Pentachlorophenol
Abstract

Due to its influence on iron corrosion and involvement in dechlorination reaction, the concentration of H+ (i.e. reaction pH) is crucial to the reactivity and efficiency of nanosized Pd0/Fe0. In this study, PCP dechlorination by smectite-templated Pd0/Fe0 was studied and the effect of pH on PCP dechlorination was investigated in detail. The reaction rate constant is critically dependant on the reaction pH over the range 6.0~10.0. When the pH is 6.0~8.0, the dechlorination rate constant () increases rapidly with decreasing the reaction pH value; the rate change is up to 3.346 folds with decreasing of per pH unit; while it decreases down to 0.3338 when pH is in the range 8.0~10.0. The reductive efficiency of zero-valent iron (ZVI) was further investigated by spiking excess PCP in the reaction system. The maximal reaction efficiency of ZVI for PCP dechlorination attains to 78% when pH is 9.0. The difference between the dechlorination rate and reductive efficiency with respect to reaction pH suggest that ZVI could not be effectively utilized to reduce PCP under acidic condition.

Published
2013

4. Dynamic Behavior of Sandwich Beams with Different Cores

Author

Han Bin Jia, Dong Xu Zhang, Lei Tian, Ying Wu, and Yan Jun Lü

Subjects
Timoshenko beam theory, Transverse plane, Nonlinear system, Materials science, General Engineering, Metal foam, Fiber, Composite material, Galerkin method, Nonlinear differential equations, Pyramid (geometry)
Abstract

The nonlinear dynamic behaviour of sandwich beams with different cores under transverse cycling loads is investigated in this paper. Based on Euler-Bernoulli beam theory, the second-order nonlinear ordinary differential equation of the sandwich beams with different cores is established by applying Hamilton’s principle and Galerkin method. The effects of the cores of metal foam and lightweight wood and porous metal fiber as well as pyramid lattice structure on the dynamic behaviour are studied through numerical simulations. It is shown that the dynamic behaviour of sandwich beams is not solely determined by and

Published
2012

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