چکیده مقاله
The removal of heavy metals from aqueous environments remains one of the most critical challenges in water treatment In this study, natural Iranian zeolite and humic acid HA modified zeolite were investigated as low cost and eco friendly sorbents for the adsorption of cadmium Cd²⁺ and nickel Ni²⁺ ions from aqueous solutions Batch equilibrium experiments were carried out under controlled pH 5 5 and temperature 25 °C with initial metal concentrations ranging from 25 to 600 mg L⁻¹ The experimental data were fitted to both Freundlich and Langmuir isotherm models The results showed that the adsorption process was well described by both models with correlation coefficients R higher than 0 98, indicating a strong agreement between experimental and theoretical data For Cd²⁺, the maximum adsorption capacity qₘₐₓ increased from 5 5 mg g⁻¹ for natural zeolite to 7 0 mg g⁻¹ for HA modified zeolite Similarly, for Ni²⁺, qₘₐₓ increased from 4 9 mg g⁻¹ to 5 6 mg g⁻¹ after modification The Freundlich constants KF also increased notably after modification from 0 31 to 0 63 L g⁻¹ for Cd²⁺ and 0 10 to 0 32 L g⁻¹ for Ni²⁺ , indicating enhanced adsorption affinity These findings demonstrate that humic acid modification significantly improves the adsorption capacity of natural zeolite due to the introduction of additional functional groups and improved surface reactivity Given the low cost, local availability, and environmental compatibility of natural zeolites, this method provides a practical and sustainable approach for heavy metal removal from aqueous environments
کلیدواژهها
نویسندگان
Hajar Merrikhpour
Civil, Water and Environmental Engineering Faculty, Shahid Beheshti University, Tehran, Iran Department of Agriculture, Sayyed Jamaleddin Asadabadi University, Asadabad, Iran
شیوه ارجاع
Merrikhpour, Hajar,1404,Natural and Modified Zeolites as Cost-Effective Adsorbents for Heavy Metal Removal from Aqueous Media,The Third National Conference on Water Quality Management and the Fifth National Conference on Water Consumption Management with a Waste Reduction and Recycling Approach,Tehran
ارائهشده در
مجموعه مقالات سومین همایش ملی مدیریت کیفیت آب و پنجمین همایش ملی مدیریت مصرف آب با رویکرد کاهش هدررفت و بازیافت11 آذر 1404 · تهران