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- W2334646021 abstract "By monitoring the change of the solution pH value, the dissolution kinetics of gel-derived Zn 2 SiO 4 powders (amorphous, β and α-phase nanometers in size) at various solution pH ranges and temperatures were studied. At 30°C, all the polymorphs showed a near-linear pH dependence on logarithmic dissolution rates in the range of pH = 1–4 and the slopes (i.e., − n value in the formula of rate = ka H + n ) of logarithmic dissolution rate-pH plots are −0.53, −0.63, and −0.51 for α, β and amorphous phases, respectively. The similarity of the pH dependencies for the polymorphs is due to the same leading cation (i.e., Zn 2+ as active site) for dissolution and similar structural linkage and hence, a similar protonation-detachment process of dissolution. The apparent activation energies for dissolution of all the powders at pH = 2 and 30–60°C indicated a diffusion-controlled process. Smaller particles of α-Zn 2 SiO 4 caused a higher acidic dissolution rate, a lower activation energy, but nearly the same pH dependence of dissolution. At 30°C and a given pH, a critical concentration of Fe 2+ in solution is required to significantly suppress the acidic dissolution of α-Zn 2 SiO 4 powders. This has been attributed to the adsorption equilibrium of Fe 2+ , which depends on pH and surface structure." @default.
- W2334646021 created "2016-06-24" @default.
- W2334646021 creator A5002765396 @default.
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- W2334646021 date "1994-09-01" @default.
- W2334646021 modified "2023-09-27" @default.
- W2334646021 title "Dissolution kinetics of Zn2SiO4 powders: Effects of polymorphs, temperature, particle size, and Fe2+ presence" @default.
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- W2334646021 doi "https://doi.org/10.1016/0016-7037(94)90151-1" @default.
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