Utilization of powdered peanut hull as biosorbent for removal of anionic dyes from aqueous solution

The combination of metal organic frameworks (MOFs) with other functional materials is a potential strategy for the preparation of advanced MOF-based materials. In this study, a simple approach is reported for the fabrication of cellulosic paper containing zeolitic imidazolate framework (ZIF-8) through in-situ loading in the papermaking process. The results showed that the ZIF-8 was evenly distributed in the paper substrate owing to the multi-layers structure of the cellulosic fibers, although the loading of the ZIF-8 particles on the single cellulosic fiber was nonuniform. The as-prepared ZIF-8 composites can be used as a highly efficient adsorbent material for anionic dyes in aqueous solution thanks to the positive charge on the surface of the ZIF-8 particles. More than 92% of the methyl orange (MO-) dye in the aqueous solution was rapidly removed through a simple filtration process using the ZIF-8 composite cellulosic paper (hand-sheets made in lab) when the content of ZIF-8 in cellulosic paper was high as 25.1%. In addition, the ZIF-8 composite paper had acceptable flexibility and could be reused at least 4 cycles by washing out the adsorbed dye.

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Simultaneous removal of cationic and anionic dyes from aqueous solution by double functional groups modified bagasse

Water Science & Technology ◽

10.2166/wst.2020.486 ◽

2020 ◽

Vol 82 (10) ◽

pp. 2159-2167

Author(s):

Ru-yi Zhou ◽

Jun-xia Yu ◽

Ru-an Chi

Keyword(s):

Aqueous Solution ◽

Functional Groups ◽

Order Kinetic ◽

Anionic Dyes ◽

Adsorption Capacities ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Amine Groups ◽

Modified Adsorbents ◽

Zeta Potential Analysis

Abstract Double functional groups modified bagasse (DFMBs), a series of new zwitterionic groups of carboxyl and amine modified adsorbents, were prepared through grafting tetraethylenepentamine (TEPA) onto the pyromellitic dianhydride (PMDA) modified bagasse using the DCC/DMAP method. DFMBs' ability to simultaneously remove basic magenta (BM, cationic dye) and Congo red (CR, anionic dye) from aqueous solution in single and binary dye systems was investigated. FTIR spectra and Zeta potential analysis results showed that PMDA and TEPA were successfully grafted onto the surface of bagasse, and the ratio of the amount of carboxyl groups and amine groups was controlled by the addition of a dosage of TEPA. Adsorption results showed that adsorption capacities of DFMBs for BM decreased while that for CR increased with the increase of the amount of TEPA in both single and binary dye systems, and BM or CR was absorbed on the modified biosorbents was mainly through electrostatic attraction and hydrogen bond. The adsorption for BM and CR could reach equilibrium within 300 min, both processes were fitted well by the pseudo-second-order kinetic model. The cationic and anionic dyes removal experiment in the binary system showed that DMFBs could be chosen as adsorbents to treat wastewater containing different ratios of cationic and anionic dyes.

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Adsorption of anionic dyes from aqueous solution using polyelectrolyte PDADMAC-modified-montmorillonite clay

10.5004/dwt.2020.26446 ◽

2020 ◽

Vol 208 ◽

pp. 407-422

Author(s):

Rachid Ait Akbour ◽

Jamila El Gaayda ◽

Fatima Ezzahra Titchou ◽

Aïcha Khenifi ◽

Hanane Afanga ◽

...

Keyword(s):

Aqueous Solution ◽

Montmorillonite Clay ◽

Anionic Dyes ◽

Modified Montmorillonite

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Synthesis of metal organic framework modified with carboxylated attapulgite and adsorption properties for organic dye

Pigment & Resin Technology ◽

10.1108/prt-07-2021-0072 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Fanhua Wu ◽

Yuyu Zhang ◽

Tao Li ◽

Yongfeng Liu ◽

Yi Liu ◽

...

Keyword(s):

Aqueous Solution ◽

Hybrid Materials ◽

Congo Red ◽

Metal Organic Framework ◽

Adsorption Efficiency ◽

Anionic Dyes ◽

Content Type ◽

Low Concentration ◽

Metal Organic ◽

The Cost

Purpose The purpose of this study was to prepare carboxylated attapulgite (APT-COOH) and then be used as one of the ligands to prepare metal organic framework (MOF) hybrid materials to reduce the cost of MOF materials and improve the dispersed condition of APT. And then the materials were used to enrich anionic dye Congo red from aqueous solution. Design/methodology/approach The MOF hybrid materials were designed by means of facile reflux method rather than hydrothermal method, characterized by Thermogravimetric Analysis (TGA), Fourier Transform Infrared (FTIR) Spectrometer and pore structure. The dispersed degree of APT-COOH in the MOF materials was validated according to adsorption efficiency for Congo red. Findings Due to introduction of APT-COOH, the microenvironment of the MOF materials changed, leading to different adsorption behaviors. Compared to the MOF material without APT-COOH, the adsorption capacities of the hybridized MOF materials with different amounts of APT-COOH introduced increased by 4.58% and 15.55%, respectively, as the initial concentration of Congo red solution of 300 mg/L. Meantime, hybridized MOF materials were suitable to remove Congo red with low concentration, while the MOF material without APT-COOH was appropriate to enrich Congo red with high concentration. Research limitations/implications The microstructure of MOF hybrid materials in detail is the further and future investigation. Practical implications This study will provide a method to reduce the cost of MOF materials and a theoretical support to treat anionic dyes from aqueous solution. Originality/value APT-COOH was prepared and used as one of the ligands to synthesize MOF material to improve the dispersed degree of APT-COOH and reduce the cost of the MOF materials. The adsorption efficiency was greatly enhanced with low concentration of Congo red solution, and the results indicated that hydrogen bonding, electrostatic interaction, and p-p conjugation were involved in the adsorption process. The prepared MOFs materials exhibited excellent adsorption efficiency, which made the present materials highly promising and potentially useful in practical application as adsorbents to enrich anionic dyes such as Congo red from aqueous solution.

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