Adsorption Behavior of Heavy Metal Ions by Hybrid Inulin-TEOS for Water Treatment

سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 27

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شناسه ملی سند علمی:

JR_CEJ-8-9_003

تاریخ نمایه سازی: 1 اردیبهشت 1403

چکیده مقاله:

The present work reports the adsorption behavior involved in the adsorption of heavy metal ions using a hybrid inulin-tetraethoxysilane (TEOS) adsorbent produced through the sol-gel process. An aqueous multi-element solution was used in order to examine the inulin-TEOS adsorbent efficiency in removing Cd۲+, Co۲+, and Ni۲+ ions. The effects of the contact duration, adsorbent dosage, initial concentration, and solution pH on the adsorption of the targeted metal ions in batch systems were evaluated. The optimal conditions for the removal of all targeted heavy metals were as follows: ۳۰ mg of an adsorbent dosage at pH ۴ and ۵ minutes of contact time with an initial concentration of ۰.۵ mg/L. A one-way analysis of variance (one-way ANOVA) with a replication test showed that all parameters had significant differences at a p-value of ۰.۰۵. At the optimum condition, ۹۲.۵۹%, ۹۰.۲۷%, and ۸۶.۴۷۲% of Cd۲+, Ni۲+, and Co۲+ were removed, respectively. Findings from kinetic studies suggest that the pseudo-second order model can successfully describe the overall adsorption process. Additionally, the adsorption process can be adequately explained using an intra-particle diffusion model with diffusion rate constants following the sequence of Kint,۱ > Kint,۲ for Co۲+ and Ni۲+ and Kint,۱ > Kint,۲ > Kint,۳ for Cd۲+ in each step. The results suggest that Ni۲+ fits with the Langmuir isotherm, while Cd۲+ and Co۲+ better fit the Freundlich one. Finally, the adsorbent can be reused and is able to retain a good percentage of removal, with percentage difference decreases of ۱.۹۹%, ۳.۲۹%, and ۴.۱۲% for Cd۲+, Ni۲+, and Co۲+, respectively, after the fifth cycle. The hybrid inulin-TEOS bio-sorbent has good adsorption capacity and durability, which could offer a low-cost practical cleaner production process for removing targeted analytes from wastewater. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۲-۰۸-۰۹-۰۳ Full Text: PDF

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