Abstract
Proper remediation of aquatic environments contaminated by toxic organic dyes has become a research focus globally for environmental and chemical engineers. This study evaluates the adsorption potential of a polymer-based adsorbent, thiourea-modified poly(acrylonitrile-co-acrylic acid) (T-PAA) adsorbent, for the simultaneous uptake of malachite green (MG) and methylene blue (MB) dye ions from binary system in a continuous flow adsorption column. The influence of inlet dye concentrations, pH, flow rate, and adsorbent bed depth on adsorption process were investigated, and the breakthrough curves obtained experimentally. Results revealed that the sorption capacity of the T-PAA for MG and MB increase at high pH, concentration and bed-depth. Thomas, Bohart-Adams, and Yoon-Nelson models constants were calculated to describe MG and MB adsorption. It was found that the three dynamic models perfectly simulate the adsorption rate and behavior of cationic dyes entrapment. Finally, T-PAA adsorbent demonstrated good cyclic stability. It can be regenerated seven times (or cycles) with no significant loss in adsorption potential. Overall, the excellent sorption capacity and multiple usage make T-PAA polymer an attractive adsorbent materials for treatment of multicomponent dye bearing effluent in a fixed-bed column system.
Highlights
The treatment of dye-bearing wastewater has become subject of great concern nowadays, due to environmental pollution and its adverse effect on public health
Fixed-bed adsorption column are extensively used for water purification and pollution control
Fixed-bed columns are vital in the determination of key adsorption test parameters such as breakthrough and saturated times, which are used to assess process efficiency and it industrial applicability [6]
Summary
The treatment of dye-bearing wastewater has become subject of great concern nowadays, due to environmental pollution and its adverse effect on public health. Cationic dyes are highly soluble in water and produce bright shining color. They are released as effluent water from industries such as paint, textile, printing, pharmaceutical, rubber, leather, food, and cosmetics [1]. Cationic dyes and their breakdown products are mutagenic, carcinogenic, and even toxic at trace level [2,3,4]. The most widely applied technique for the removal of dyes and other emerging contaminants from water is adsorption process, due to simple operating procedure, effectiveness and regeneration capability. Fixed-bed columns are vital in the determination of key adsorption test parameters such as breakthrough and saturated times, which are used to assess process efficiency and it industrial applicability [6]
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