Magnetic adsorption separation process: an alternative method of mercury extracting from aqueous solution using modified chitosan coated Fe3O4 nanocomposites

Journal of Chemical Technology and Biotechnology - Tập 92 Số 1 - Trang 188-200 - 2017
Ali Azari1,2, Hamed Gharibi3, Babak Kakavandi4, Ghader Ghanizadeh5, Allahbakhsh Javid3, Amir Hossein Mahvi2, Kiomars Sharafi1,2, Touba Khosravia6
1Department of Environmental Health Engineering, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
2Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
3Department of Environmental Health Engineering, School of Public Health, Shahroud University of Medical Sciences, Shahroud, Iran
4Department of Environmental Health Engineering, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
5Health Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
6Research Center for Environmental Determinants of Health (RCEDH), Kermanshah University of Medical Sciences, Kermanshah, Iran

Tóm tắt

AbstractBACKGROUND

In the present work, Hg (II) is considered as one of the most dangerous elements being released excessively into the environment from various sources. Therefore, the aim of this study is the removal of Hg (II) from wastewater effluent by synthesizing a magnetic chitosan modified with glutaraldehyde (MCS‐GA) as an adsorbent. The composite structure was characterized using SEM/EDAX, FTIR, and XRD techniques. The adsorbent was tested by a batch system to determine the optimum conditions for removing Hg (II) under real conditions.

RESULTS

The results showed that 0.5% GA effectively enhanced the removal efficiency. The maximum adsorption capacity of MCS‐GA was 96 mg g−1 at pH 5.0 and 25 °C. The adsorption isotherm data obeyed the Langmuir model (R2>0.981) and pseudo‐second‐order (R2>0.996) kinetic models. It was also found that Hg (II) adsorption on MCS‐GA is inherently exothermic and occurs spontaneously. The reusability of MCS‐GA was approved over 12 sequential cycles of adsorption–desorption. ANOVA analysis showed that the contact time has a synergistic effect on Hg (II) removal, whereas pH and initial concentration have antagonistic effects.

CONCLUSION

Overall, the synthesized adsorbent was able to remove Hg (II) efficiently under both experimental and real conditions. © 2016 Society of Chemical Industry

Từ khóa


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Thông tin xuất bản

Journal of Chemical Technology and Biotechnology

Tập 92 Số 1

188-200

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