Silica-enhanced agarose monolith as a highly porous and robust adsorbent for the removal of cationic dyes from wastewater

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Porous Materials Pub Date : 2024-04-24 DOI:10.1007/s10934-024-01622-8

Masoumeh Firouzy, Payman Hashemi, Alireza Ghiasvand

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Abstract

A silica-enhanced agarose monolith adsorbent was synthesized and evaluated as a highly porous and robust adsorbent for the removal of Janus Green B (JGB) as a cationic dye from aqueous solutions. For this purpose, the molded agarose monolith adsorbent was reinforced by incorporating silica into its structure. The effects of sample volume, pH, contact time, and stirring speed on the removal efficiency of the sorbent were optimized using a response surface methodology with a central composite design. Under the optimal conditions, the monolith achieved satisfactory removal efficiencies greater than 98% for JGB. The maximum adsorption capacity of the agarose-silica adsorbent for 200 mg L^− 1 of JGB was approximately 60 mg g^− 1. Structural and morphological characterization was performed using Fourier transform infrared spectroscopy, scanning electronic microscopy and, energy-dispersive X-ray spectroscopy. The monolith exhibited excellent regenerable properties, with a removal efficiency exceeding 96% after three times of usages. Equilibrium adsorption data showed better agreement with the Freundlich isotherm model compared to Langmuir. This work demonstrated the enhanced physical stability and high porosity of the agarose-silica monoliths for the efficient removal of JGB cationic dye from real-life water and wastewater samples.

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二氧化硅增强型琼脂糖整体石是一种用于去除废水中阳离子染料的高孔坚固吸附剂

本研究合成了一种二氧化硅增强型琼脂糖整体吸附剂，并对其进行了评估，认为它是一种多孔性强的吸附剂，可用于从水溶液中去除阳离子染料 Janus Green B (JGB)。为此，在模制琼脂糖整体吸附剂的结构中加入了二氧化硅。采用中心复合设计的响应面方法优化了样品量、pH 值、接触时间和搅拌速度对吸附剂去除效率的影响。在最佳条件下，整体吸附剂对 JGB 的去除率达到了令人满意的 98% 以上。琼脂糖-二氧化硅吸附剂对 200 mg L- 1 的 JGB 的最大吸附容量约为 60 mg g-1。使用傅立叶变换红外光谱、扫描电子显微镜和能量色散 X 射线光谱对结构和形态进行了表征。该整体石具有出色的可再生性，使用三次后的去除率超过 96%。与 Langmuir 相比，平衡吸附数据与 Freundlich 等温线模型更为吻合。这项工作证明了琼脂糖-二氧化硅单片具有更强的物理稳定性和高孔隙率，可有效去除实际水和废水样品中的 JGB 阳离子染料。

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来源期刊

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.