چكيده به لاتين
By gaining a better understanding of the importance of the environment and understanding the direct impact of the health of water resources on public health, effective and low-cost treatment methods and the tendency to use low-cost inorganic adsorbents have increased. In the present study, natural LECA and modified LECA with hexadecyltrimethylammonium bromide surfactant were used to remove Congo red anionic dye.To investigate the structure of natural LECA and modified LECA in order to understand the performance correctly, the adsorbent properties in both natural and modified state were investigated by XRF, SEM, BET and FTIR tests. The effects of contact time variables, initial pollutant concentration, adsorbent dosage, solution pH and temperature on the batch process were studied. The adsorption isotherms were determined and the experimental data were matched with the three Langmuir, Freundlich and Temkin models. And according to the results, the most concordance was obtained in both adsorption modes by LECA and modified LECA by Langmuir isotherm. The adsorption capacity by Langmuir isotherm in these states was 6.66 and 20.04 mg/g, respectively. Studying the behavior of the adsorption process at different temperatures provided the possibility of thermodynamic studies and by studying the influence of contact time factor on the adsorption process kinetic studies of the process. The results of these studies indicate the maximum agreement of the data with the pseudo-second-order kinetic equation. Based on the results, the availability, non-contamination and low-cost use of LECA as an inorganic adsorbent is an effective adsorbent for the removal of Congo red dyes from water and wastewater sources.
