Numerical study of aerosols motion and deposition outside and inside buildings with different geometries

In this study, motion and deposition of various sizes of aerosols in turbulent flow of air inside and outside of two-dimensional buildings with closed and open windows have been investigated, numerically. This simulation was based on FVM solving of RANS equations with k–ε model. Eulerian–Lagrangian method was used to simulate fluid and particles motions, respectively, and one-way coupling between them was considered. Effect of particles size on deposition efficiency has been calculated. The results shown that, the particles deposition outside and inside of the building with domical roof is less than triangular and flat roof buildings.     

An electrochemical nanocomposite modified carbon paste electrode as a sensor for simultaneous determination of hydrazine and phenol in water and wastewater samples

In this study, we report preparation of a high sensitive electrochemical sensor for determination of hydrazine in the presence of phenol in water and wastewater samples. In the first step, we describe synthesis and characterization of ZnO/CNTs nanocomposite with different methods such as transmission electron microscopy (TEM) and X-ray diffraction (XRD). In the second step, application of the synthesis nanocomposite describes the preparation of carbon paste electrode modified with n-(4-hydroxyphenyl)-3,5-dinitrobenzamide as a high sensitive and selective voltammetric sensor for determination of hydrazine and phenol in water and wastewater samples. The mediated oxidation of hydrazine at the modified electrode was investigated by cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy (EIS). Also, the values of catalytic rate constant (k) and diffusion coefficient (D) for hydrazine were calculated. Square wave voltammetry (SWV) of hydrazine at the modified electrode exhibited two linear dynamic ranges with a detection limit (3σ) of 8.0 nmol L^?1. SWV was used for simultaneous determination of hydrazine and phenol at the modified electrode and quantitation of hydrazine and phenol in some real samples by the standard addition method.