چكيده به لاتين
The risk of water pollution is increasing every day. Therefore, many studies have been done to solve this problem on different materials. Zeolites and natural polymers along with their modifications have been widely used to remove water pollutants. Xanthan gum is considered an important natural and industrial biopolymer due to its extraordinary properties such as non-toxicity, cell growth ability and non-sensitizing effect. In the present study, two types of nanocomposites have been prepared and investigated. In the first nanocomposite (XAZC), a chemical modification with acrylamide was first performed. Similarly, two chemical modifications were done on clinoptilolite zeolite, the first one was acid modification with hydrochloric acid and the second one was modification with cobalt oxide by co-precipitation method and finally they were composited together in aqueous solution and the results showed that in concentration, time, The optimal amount of adsorbent and pH for crystal violet dye and gemifloxacin drug were 100 mg/l, 30 minutes, 1.25 g/l, 6 and 160 minutes, 3.75 mg/g, 8, respectively. The maximum equilibrium absorption for crystal violet and gemifloxacin was 597.11 and 236.77 mg/g, respectively. And the second nanocomposite (XBZF) was obtained from physical modification with beta-cyclodextrin by composite with zeolite/cobalt ferrite by a simple method in aqueous solution. The zeolite modified with hydrochloric acid was prepared by co-precipitation with cobalt ferrite to magnetize the composite. The final one was tested for absorption performance with crystal violet and gemifloxacin in concentration, time, amount and pH, which were 25 mg/L, 30 minutes, 1.25 g/L, 8 and 25 mg/L, 60 minutes, 25/L, respectively. 1 g/liter, 8 was obtained as optimal. The maximum equilibrium absorption for crystal violet and gemifloxacin was 833.33 and 483.44 mg/g, respectively. The results obtained from Langmuir and Freundrich isotherms showed the better correlation coefficient of Langmuir isotherm for the first composite and Freundich isotherm for the second composite. All samples were analyzed by XRD, FTIR, SEM, EDAX, TGA, Zeta Potential, VSM and BET methods.
