abdollahzadeh h

The aim of this research was to study the role of perfectionism and eating attitude in predicting body image concerns in university students.

The statistical population included all Azad university students in the academic year of 2019-2020 in Golestan province. The research sample consisted of 500 university students who were selected through Cluster sampling method. Body image concern questionnaire (Littleton et al, 2005), perfectionism questionnaire (Ahwaz, 1378) and eating attitude(Garner et al. 1982) were used to gather data. The Data were analyzed by stepwise regression analyses.

The results of stepwise regression analyses indicated that there is a correlation coefficient (0.332) between perfectionism and body image concerns, which is significant at the level (P <0.01) and there is a correlation coefficient (0.273) between  eating attitudes and body image concern, which is significant at the level (P <0.01). Perfectionism and eating attitudes can predict 14% of body image concerns.

The findings of the study confirm the role of perfectionism and eating attitudes in predicting body image concerns, which can facilitate the explanation and etiology of this variable.

The presence of natural organic matter in water sources creates various problems, especially in common water treatment process. These compounds cause unfavorable taste and odor in water and are among the most important precursors of water disinfection by-products. This study was carried out to evaluate the efficiency of activated carbon (AC) and activated carbon modified with ZnO nanoparticles (AC-ZnO) in removal of humic acid (HA) from aqueous solutions.

In the present experimental study, the removal of HA with AC or AC-ZnO was discontinuously studied as a function of pH, contact time, HA concentration, and absorbent dose. The structure of absorbents and their morphology were investigated by FTIR, SEM, XRD and pHpzc techniques. The HA was measured using spectrophotometer at the wavelength of 245 nm. Absorption isotherm was determined by using Langmuir and Froundlich models and absorption kinetics by pseudo-first and pseudo second-order models.

The efficiency of removing HA had a direct relationship with absorbent dose and inverse relationship with pH and HA concentrations. The optimal removal rate of HA for 1.6 g/L dose of AC or AC-ZnO were reached to 82.44 % and 96/26%, respectively, in HA concentration of 50 mg/L and contact time of 40 minutes

The removal rate was considerably higher for AC-ZnO than AC, which indicates the effective role of nanoparticulate stabilization on activated carbon. As a result, the method of nanoparticulate stabilization on activated carbon can provide an effective and very efficient adsorbent and appropriate alternative to remove humic acid from aqueous media.