Teerasong Saowapak, Saenghirun Thanakrit, Sunthornchainukul Thanawat, Thammaso Supinya, Chompoosor Apiwat, Nanan Suwat
Flow Innovation-Research for Science and Technology Laboratories (FIRST Laboratories), Bangkok 10520, Thailand.
Department of Chemistry and Applied Analytical Chemistry Research Unit, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
ACS Omega. 2024 Jun 25;9(27):29644-29650. doi: 10.1021/acsomega.4c02973. eCollection 2024 Jul 9.
This work presents an adsorptive removal of indigo carmine (IC) dye using a polyvinylpyrrolidone capped bismuth oxybromide (PVP-BiOBr) adsorbent. PVP-BiOBr was synthesized via a simple precipitation method. The morphology and surface chemical structure of the adsorbent were characterized using XRD, SEM, FTIR, and BET analyses. The adsorption isotherm and kinetics were investigated to reveal the mechanism of dye removal. Prepared PVP-BiOBr has a crystallite size of 19.7 nm, with a mean particle size of ∼2 μm and a surface area of 5.14 m g. The optimum pH for this adsorptive process spanned the range of 4 to 9. Experimental data indicated applicability of the Langmuir isotherm model, and the study confirms a pseudo-second-order kinetics model. The maximum adsorption capacity for IC dye was 208.3 mg g. A flow-circulation system was developed for the treatment of IC dye contaminated water samples. PVP-BiOBr was packed inside a column and did not spill into the water sample after treatment. The removal efficiency was ≥90% after 25 min. The PVP-BiOBr adsorbent could be reused for three cycles. This work demonstrates that PVP-BiOBr is a promising candidate as an adsorbent for IC dye removal. Additionally, the flow-based system establishes an automated operation in continuous mode, which is viable for large scale applications.
本研究采用聚乙烯吡咯烷酮包覆的溴氧化铋（PVP-BiOBr）吸附剂对靛蓝胭脂红（IC）染料进行吸附去除。通过简单的沉淀法合成了PVP-BiOBr。利用XRD、SEM、FTIR和BET分析对吸附剂的形貌和表面化学结构进行了表征。研究了吸附等温线和动力学，以揭示染料去除的机制。制备的PVP-BiOBr微晶尺寸为19.7nm，平均粒径约为2μm，表面积为5.14m²/g。该吸附过程的最佳pH值范围为4至9。实验数据表明Langmuir等温线模型适用，该研究证实了拟二级动力学模型。IC染料的最大吸附容量为208.3mg/g。开发了一种流动循环系统用于处理受IC染料污染的水样。PVP-BiOBr填充在柱内，处理后不会泄漏到水样中。25分钟后去除效率≥90%。PVP-BiOBr吸附剂可重复使用三个循环。这项工作表明，PVP-BiOBr是一种有前途的IC染料去除吸附剂。此外，基于流动的系统建立了连续模式的自动化操作，适用于大规模应用。
