NDLI: Arsenic mitigation by chitosan-based porous magnesia-impregnated alumina: performance evaluation in continuous packed bed column

Content Provider	Springer Nature Link
Author	Sarkar, P. Saha, S.
Copyright Year	2015
Abstract	Dissolved arsenic in contaminated groundwater is a major concern on a global scale due to its extreme toxicity. This paper reports a magnesium oxide-impregnated mesoporous alumina synthesized using biopolymer chitosan template. The adsorbent was first characterized by BET, SEM and EDAX analysis. The packed column performed effectively over wide range of pH and exhibited a maximum adsorption capacity of 17.2 mg/g for an input arsenic concentration of 20 mg/L. The experimental data fitted well with pseudo-second-order kinetics. Thermodynamic study on the adsorption phenomena revealed that arsenic adsorption on the porous adsorbent was spontaneous, and the process was exothermic. The arsenic sorption capacity at breakthrough point was greatly dependent on bed depth. A bed depth service time approach was adopted to describe the continuous flow system. The column after exhaustion was regenerated by eluting the bound arsenate [As(V)] with ~15 bed volume sodium hydroxide solution. The adsorbent could retain its capacity up to five cycles of such regeneration. The influence of different operating conditions such as bed depth, flow rate and initial arsenic concentration was investigated statistically by the two-level full-factorial experimental designs to evaluate optimum operating conditions.
Starting Page	243
Ending Page	256
Page Count	14
File Format	PDF
ISSN	17351472
Journal	International Journal of Environmental Science & Technology
Volume Number	13
Issue Number	1
e-ISSN	17352630
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-04-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Drinking water Ecotoxicology Breakthrough Water Management Waste Water Technology Adsorption BDST model Aquatic Pollution Environment Water Pollution Control Factorial design Environmental Chemistry Environmental Science and Engineering Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Environmental Engineering Agricultural and Biological Sciences

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