Impact of Crosslinking Degree on Structure, Swelling Behaviour and Heavy Metals Uptake of Polyacrylate/Kaolin Hydrogel Composite | ||||
| Egyptian Journal of Chemistry | ||||
| Article 38, Volume 64, Issue 6, June 2021, Page 3077-3085 PDF (959.44 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2021.59457.3277 | ||||
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| Authors | ||||
Mohamed Sorour; heba hani   ; Hayam Shaalan; Eman Sayed; Amany Elmansoup
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| Chemical Engineering and Pilot Plant Department, National Research Centre, El-Buhouth Street, Dokki, Giza, Egypt | ||||
| Abstract | ||||
| Polyacrylate/kaolin hydrogel composite was prepared via ultrasonic irradiation using various crosslinking agent contents (N, N'-Methylenebisacrylamide (MBA)) and characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and Brunauer Emmett and Teller (BET) method. Moreover, heavy metals adsorption was investigated using synthetic solutions and industrial wastewater (single and mixed elements) in both lab-scale batch and pilot-scale continuous modes. Results indicated that 0.3 wt% MBA is the optimum content regarding structure, swelling behavior and single element batch adsorption results. Batch tests revealed adsorption capacities of 75, 33, 38 and 96 mg/g for Cr, Co, Ni and Pb, respectively from mixed solutions. It is inferred that mixed synthetic solutions and industrial wastewater have lower adsorption capacities than single solutions, where Pb attained the highest performance. Pilot-scale continuous adsorption for mixed synthetic solutions in a fluidized bed column revealed that 24 h cycle time is appropriate for Cr and Pb removal while 48 h is optimum for Co and Ni. Sulphuric acid revealed the best desorption efficiencies which lie in the order of Co > Ni >Pb >>Cr. According to these results, the developed hydrogel composite is reliable for heavy metals uptake under different adsorption modes. | ||||
| Keywords | ||||
| polyacrylate composite; crosslinking degree; heavy metals; adsorption/desorption; industrial wastewater | ||||
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