کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6467371 1423252 2017 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A statistical shrinking core model to estimate the overall dechlorination rate of PCE by an assemblage of zero-valent iron nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
A statistical shrinking core model to estimate the overall dechlorination rate of PCE by an assemblage of zero-valent iron nanoparticles
چکیده انگلیسی


- A shrinking-core model is developed for nanoparticles/dissolved pollutant reactions.
- The overall reaction rate is expressed as function of transport/reaction parameters.
- The statistics of particle size distribution is incorporated into the model.
- Batch tests of dissolved PCE remediation by nZVI are used for parameter estimation.
- For the system nZVI/PCE, the parameter values are estimated with inverse modeling.

A parametric shrinking-core model is used to quantify the dechlorination rate of chlorinated pollutants dissolved in water by zero-valent iron nanoparticles (nZVI). The mass-transfer processes are coupled with the instantaneous reaction occurring in the solid/liquid interface to compute the transient changes of dissolved pollutant concentration in bulk and suspended nZVI concentration. A sensitivity analysis is carried out to identify the dominant parameters governing the overall reaction rate for a system of uniform nanoparticles. The model is extended to assemblages of non-uniform ZVI nanoparticles with sizes following a distribution function. The statistical shrinking-core model is used to estimate the PCE dechlorination kinetic parameters along with the mass-transfer coefficients with inverse modeling of batch experiments. The observed discrepancy between numerical predictions and experimental datasets may be attributed to uncertainties associated with the nZVI oxidation by other species, and PCE adsorbed on oxidized iron. An approximate analysis of model equations allows the development of an analytic phenomenological model providing the overall reaction rate as a function of dissolved PCE concentration.

137

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 167, 10 August 2017, Pages 191-203
نویسندگان
, , , , ,