Investigation of Removal Efficiency of Nano Sized Alumina for Removal of Acid Red 18 from Aqueous Solutions

Background and Objectives: Acid Red 18 dye was one of the Azo colors that are used in textile and dyeing industries. These dyes are often toxic and carcinogenic to humans and the environment as pollution. This study was conducted with the aim of investigating on nano alumina efficiency for removal of Acid Red 18 dye from aqueous solutions. Materials and Methods: This study was carried out in the laboratory scales and effect of The initial concentration of dye (25 to 100 mg/l), pH solution (3, 7, 11), nano alumina concentration (0.1, 0.4, 1, 1.5 g/l) and contact time in range 5 to 240 min on dye removal efficiency were evaluated. Also kinetic and isotherm models of adsorption process were evaluated. Results: The high removal efficiency was observed in pH=3, contact time=60 min and Adsorbent concentration of 0.4 g/L. The rate of color removal were 63/24, 50/84 and 20 percent respectively at pH of 3, 7 and 11 for the initial dye concentration of 25 mg/l and 0.4 g/l mass absorbent that showing with increasing pH removal efficiency is reduced. the studied dye absorption isotherm was fitted Langmuir model (R2=0.994) which was 83.33 mg/g for maximum adsorption. The results from kinetic studies showed that removal of the studied dye was best described by pseudo-second order kinetic model (r2=0.999). Conclusion: The present study shows nano alumina powder is promising adsorbent for removal of Acid Red 18 from aqueous solution

Investigation of Nano Alumina Efficiency for Removal of Acid Red 18 Dye from Aqueous Solutions

Background: Textile and dying industries are considered most important industries of each country. In these industries due to the use of different colors in different processes, their wastewater is highly colored and must be treated before discharge to the environment. The objective of this study was Investigation of nano alumina efficiency for removal of Acid Red 18 dye from aqueous solutions. Methods: This study was carried out in the laboratory scales. Synthetic solution was made from Acid Red 18 dye stock and effect of different parameters such as dye concentration, pH solution, nano alumina concentration and contact time on dye removal efficiency were evaluated. Also kinetic and isotherm models of adsorption process were evaluated. Results: Results from experiments showed that dye removal was increased with increasing contact time and nano alumina powder concentration, while decreased with increasing of pH and dye concentration. Experimental data were best fitted to Longmuir isotherm model (r2=0.994). The maximum adsorption capacity for Acid Red 18 was found 83.33 mg g-1. The results from kinetic studies showed that removal of Acid Red 18 was best described by pseudo-second order kinetic model (r2=0.999). Conclusion: The present study shows nano alumina powder is promising adsorbent for removal of Acid Red 18 from aqueous solution

Effects of the COVID-19 pandemic on lifestyle among Iranian population: A multicenter cross-sectional study

Background: Quarantine, an unpleasant experience, was implemented in many countries to limit the spread of Coronavirus disease 2019 (COVID-19), which it could associated whit lifestyle changes. The present study aimed to determine the changes in Iranian's lifestyle during COVID-19 pandemic. Materials and Methods: In the present cross-sectional study, 2710 Iranian people completed an online researcher-made questionnaire asking lifestyle regarding COVID-19, which includes five sections about physical activity, stress and anxiety, nutrition habit, sleep disorders, and interpersonal relationship in addition to demographic data from January to February 2021, using the multistage cluster sampling method. Results: The participants' mean age was 33.78 ± 11.50 years and 68.3 of them were female. Traveling, sightseeing, and family visits have been eliminated from 91, 83.5, and 77.5 of participants' lives, respectively. There were increase in stress level (P < 0.001), weight of the participants (P < 0.001), sleep problems (P < 0.001), and healthier foods (P < 0.001) but decrease in interpersonal communication (P < 0.001) and the amount of physical activity (P < 0.001). Conclusion: In summary, this study indicates some changes in lifestyle of Iranian people, including changes in some eating practices, physical activity, social communication, and sleeping habits during the pandemic. However, as the COVID-19 pandemic is ongoing, a comprehensive understanding of these behaviors and habits can help develop interventions to mitigate the negative lifestyle behaviors during COVID-19 pandemic. © 2022 EDP Sciences. All rights reserved