Anion release and uptake kinetics: Structural changes of layered 2-dimensional ZnNiHN upon uptake of acetate and chlorinated acetate anions

作者：Machingauta Cleopas; Hossenlopp Jeanne M^*

来源：Journal of Colloid and Interface Science, 2013, 411: 129-137.

DOI：10.1016/j.jcis.2013.08.037

• Electronic spatial extent
• Topotactic
• Avrami Erofe%26apos
• ev
• Isoconversional

X-ray diffraction and UV-vis spectroscopy were used for the investigation of ion exchange reaction kinetics of nitrates with acetate (Ac), chloro acetate (ClAc), dichloro acetate (dClAc) and trichloro acetate (tClAc) anions, using zinc nickel hydroxy nitrate (ZnNiHN) as the exchange precursor. The exchange reactions conducted at 24, 30, 40 and 50 degrees C revealed that rate constants were inversely related to the calculated anion electronic spatial extent (ESE), while a direct relationship between rate constants and the average oxygen charges was observed. Temporal solid phase structural transformations were shown to be affected by the nature of the guest anions. The amount of nitrates released into solution has been shown to decrease as the guest anions became more chlorinated. Use of isoconversional approach revealed that activation energies changed significantly with alpha during dClAc intercalation than for the other anions. The topotactic intercalation of the guest anions, except dClAc, followed the Avrami-Erofe%26apos;ev kinetic model for the entire reaction progress.

• 出版日期2013-12-1