Preparation of PVP-BiOBr Adsorbent for Efficient Indigo Carmine Dye Removal Using Flow-Circulation Systems

Saowapak Teerasong ^1,2, Thanakrit Saenghirun ², Thanawat Sunthornchainukul ²

⁰Flow Innovation-Research for Science and Technology Laboratories (FIRST Laboratories), Bangkok 10520, Thailand.

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July 15, 2024

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Summary

Polyvinylpyrrolidone capped bismuth oxybromide (PVP-BiOBr) effectively removes indigo carmine dye. This adsorbent shows high capacity and reusability in a continuous flow system for wastewater treatment.

Area Of Science

Materials Science
Environmental Chemistry
Nanotechnology

Background

Indigo carmine (IC) dye is a common water pollutant.
Effective adsorbents are needed for dye removal from industrial wastewater.

Purpose Of The Study

To synthesize and characterize polyvinylpyrrolidone capped bismuth oxybromide (PVP-BiOBr) for indigo carmine dye removal.
To investigate the adsorption mechanism and performance of PVP-BiOBr.
To develop a continuous flow system for practical dye removal applications.

Main Methods

PVP-BiOBr synthesized via precipitation.
Characterization using XRD, SEM, FTIR, and BET.
Adsorption studies to determine isotherm and kinetics.
Development of a flow-circulation system for continuous treatment.

Main Results

PVP-BiOBr exhibited a crystallite size of 19.7 nm and a surface area of 5.14 m² g⁻¹.
Optimal adsorption occurred between pH 4-9, following Langmuir isotherm and pseudo-second-order kinetics.
Maximum adsorption capacity reached 208.3 mg g⁻¹.
The flow system achieved ≥90% removal efficiency in 25 min with adsorbent reusability over three cycles.

Conclusions

PVP-BiOBr is a highly effective adsorbent for indigo carmine dye removal.
The developed flow-circulation system offers an automated and scalable solution for wastewater treatment.
PVP-BiOBr shows significant potential for industrial applications in dye removal.