University of Tehran Press Iranian Journal of Soil and Water Research 2008-479X 55 10 2024 12 21 Pre-concentration of cadmium soluble in water by carbon spheres synthesized using the oilothermal method Pre-concentration of cadmium soluble in water by carbon spheres synthesized using the oilothermal method 1743 1760 99945 10.22059/ijswr.2024.374697.669687 FA Firouzeh Norouzi Goldareh Soil Science Dep, Bu-Ali Sina University, Hamedan, Iran Ghasem Rahimi Associate Prof. Soil science, Faculty of Agriculture, Bu Ali Sina University. Hamadan Reza Khavari Farid Soil Science Dep., Bu-Ali Sina University, Hamedan, Iran Journal Article 2024 04 04 The use of carbon adsorbents in solid phase extraction (SPE) of cadmium in very low concentrations has become very common due to its high efficiency and low price. In this research, carbon spheres (CSs) produced from sucrose were synthesized using the hot oil method and were used as carbon adsorbents in solid phase extraction of cadmium from aqueous solutions. Adsorption isotherm experiments in the concentration range of 5 to 10000 ppb cadmium, kinetics of adsorption in 10 to 140 seconds, pH-dependent adsorption in the range of pH 1 to 10 and the effect of ionic strength and competing cations on the efficiency of cadmium adsorption in concentrations after The field was carried out from 0 to 50 ppm. The efficiency of cadmium washing using HNO3 was done in the concentration and volume range of 0.1 to 0.5 (eqL-1) and 40 to 160 (μl), respectively. CSs had a specific surface area of 375/500 m2g-1 with a completely spherical and smooth shape. The data of isotherm and kinetics of Cd adsorption showed the best fit with Langmuir model and Elovich model, respectively. The maximum cadmium absorption capacity (qm) for CSs was equal to 7.367 mg g-1. Cd absorption efficiency reached the maximum absorption value at pH 10. CSs showed the highest resistance of cadmium absorption efficiency against potassium cation. A normal concentration of 0.5 HNO3 in a volume of 160 microliters was considered for washing Cd from CSs. Therefore, CSs can be a suitable carbon adsorbent for SPE Cadmium from water samples. The use of carbon adsorbents in solid phase extraction (SPE) of cadmium in very low concentrations has become very common due to its high efficiency and low price. In this research, carbon spheres (CSs) produced from sucrose were synthesized using the hot oil method and were used as carbon adsorbents in solid phase extraction of cadmium from aqueous solutions. Adsorption isotherm experiments in the concentration range of 5 to 10000 ppb cadmium, kinetics of adsorption in 10 to 140 seconds, pH-dependent adsorption in the range of pH 1 to 10 and the effect of ionic strength and competing cations on the efficiency of cadmium adsorption in concentrations after The field was carried out from 0 to 50 ppm. The efficiency of cadmium washing using HNO3 was done in the concentration and volume range of 0.1 to 0.5 (eqL-1) and 40 to 160 (μl), respectively. CSs had a specific surface area of 375/500 m2g-1 with a completely spherical and smooth shape. The data of isotherm and kinetics of Cd adsorption showed the best fit with Langmuir model and Elovich model, respectively. The maximum cadmium absorption capacity (qm) for CSs was equal to 7.367 mg g-1. Cd absorption efficiency reached the maximum absorption value at pH 10. CSs showed the highest resistance of cadmium absorption efficiency against potassium cation. A normal concentration of 0.5 HNO3 in a volume of 160 microliters was considered for washing Cd from CSs. Therefore, CSs can be a suitable carbon adsorbent for SPE Cadmium from water samples. https://ijswr.ut.ac.ir/article_99945_7a75d2b072da2cf84ced3f5167e5a5e8.pdf