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A Novel Adsorbent Obtained by Inserting Carbon Nanotubes Into Cavities of Diatomite and Applications for Organic Dye Elimination From Contaminated Water

A Novel Adsorbent Obtained by Inserting Carbon Nanotubes Into Cavities of Diatomite and Applications for Organic Dye Elimination From Contaminated Water

Hongwen Yu, Bunshi Fugetsu

J Hazard Mater. 2010 May 15;177(1-3):138-45.

PMID: 20045251

Abstract:

A novel approach is described for establishing adsorbents for elimination of water-soluble organic dyes by using multi-walled carbon nanotubes (MWCNTs) as the adsorptive sites. Agglomerates of MWCNTs were dispersed into individual tubes (dispersed-MWCNTs) using sodium n-dodecyl itaconate mixed with 3-(N,N-dimethylmyristylammonio)-propanesulfonate as the dispersants. The resultant dispersed-MWCNTs were inserted into cavities of diatomite to form composites of diatomite/MWCNTs. These composites were finally immobilized onto the cell walls of flexible polyurethane foams (PUF) through an in situ PUF formation process to produce the foam-like CNT-based adsorbent. Ethidium bromide, acridine orange, methylene blue, eosin B, and eosin Y were chosen to represent typical water-soluble organic dyes for studying the adsorptive capabilities of the foam-like CNT-based adsorbent. For comparisons, adsorptive experiments were also carried out by using agglomerates of the sole MWCNTs as adsorbents. The foam-like CNT-based adsorbents were found to have higher adsorptive capacities than the CNT agglomerates for all five dyes; in addition, they are macro-sized, durable, flexible, hydrophilic and easy to use. Adsorption isotherms plotted based on the Langmuir equation gave linear results, suggesting that the foam-like CNT-based adsorbent functioned in the Langmuir adsorption manner. The foam-like CNT-based adsorbents are reusable after regeneration with aqueous ethanol solution.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP14933096	3-(N,N-Dimethylmyristylammonio)propanesulfonate		14933-09-6	Price

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