Visible Spectroscopy of Methylene Blue on Hectorite, Laponite B, and Barasym in Aqueous Suspension

Cenens, Jos

doi:10.1346/ccmn.1988.0360302

Cited by 310 publications

(226 citation statements)

References 29 publications

Supporting

Mentioning

203

Contrasting

Unclassified

Order By: Relevance

“…The specificity of absorption depends on a number of factors, including protonation, adsorption to other materials, and metachromasy -the formation of dimers and higher-order aggregates depending on concentration and other interactions [22]. Methylene blue can exist as MB + , MBH 2 + , (MB + ) 2 and (MB + ) 3 in aqueous solution.…”

Section: Methylene Blue and Its Analysismentioning

confidence: 99%

Comparative Adsorption of Methylene Blue on Different Low Cost Adsorbents by Continuous Column Process

Hossain¹,

Ali²,

Islam³

2018

ILCPA

View full text Add to dashboard Cite

Abstract. Dyes are commonly found in the effluents of many industries. The effectiveness of adsorption for the removal of dye from wastewaters has been made it an ideal alternative to other expensive treatment methods. Continuous column adsorption is more affective than batch adsorption. A comparative column adsorption study was performed using three different low cost adsorbents for the removal of methylene blue from synthetic wastewater. Sand was collected from Cox's Bazar, and sugarcane bagasse and used black tea leaves were locally prepared in laboratory. Three columns were designed for different adsorbents maintaining all conditions were to be approximately similar. UV-vis spectroscopic method was used for analysis of methylene blue in solution. Column adsorption experiments were performed to investigate the comparison of breakthrough curves and exhaust capacity of three different adsorbents. Column study shows that the adsorption capacity of used black tea leaves is highest. The adsorption capacity of bagasse is lower than tea leaves but higher than sand.

show abstract

Section: Methylene Blue and Its Analysismentioning

confidence: 99%

Comparative Adsorption of Methylene Blue on Different Low Cost Adsorbents by Continuous Column Process

Hossain¹,

Ali²,

Islam³

2018

ILCPA

View full text Add to dashboard Cite

show abstract

“…Conforme o tempo passa, ocorre uma reordenação das moléculas nas superfícies externas levando à formação de monômeros do corante que, por sua vez, migram para os espaços interlamelares (superfícies internas) onde sofrem protonação pelas moléculas de água que se encontram no local. 32 Em alguns casos, alguns monômeros que estejam na solução podem migrar diretamente para esses espaços internos, sem adsorver inicialmente nas superfícies externas.…”

Section: Corantes Em Argilas 22-30unclassified

Adsorção do corante azul de metileno em partículas de argilominerais: análise dos tamanhos das partículas

Sartori¹,

Morais²,

Filho³

et al. 2011

Quím. Nova

View full text Add to dashboard Cite

Recebido em 15/4/10; aceito em 4/11/10; publicado na web em 18/2/11 ADSORPTION OF METHYLENE BLUE ON CLAY MINERALS PARTICLES: ANALYSIS OF THE CLAY PARTICLE SIZES.Interactions of cationic dye methylene blue (MB) with clay particles in aqueous suspension have been extensively studied. As already known, the number of natural negative charges on the clay modifies significantly the particle sizes dispersed in water and therefore the nature of the interaction with the dye. This work evaluated with UV-Vis spectroscopy method how the clay particle sizes weighted on the adsorption and rearrangement of the dye molecules in aqueous system. The results obtained from light-scattering measurements confirmed that larger particles are found in suspensions containing the high-charged clays as the visible absorption band related to the MB aggregates (570 nm) on these suspensions prevailed.Keywords: clays; methylene blue; UV-Vis spectroscopy. INTRODUÇÃOSempre houve um interesse muito grande nos processos de adsorção de moléculas orgânicas em sistemas coloidais aquosos, sobretudo naqueles contendo argilominerais. 1-12 O conhecimento sobre tais processos manifesta-se em diferentes setores da sociedade como agricultura, indústrias, águas, etc.. 13 Diversas espécies químicas podem ser adsorvidas em diferentes substratos, como as argilas. Argilas 13-17Os argilominerais são os minerais constituintes das argilas. Eles são silicatos hidratados dispostos em camadas (ou lamelas) formadas por subcamadas (ou "folhas") de tetraedros de silício (ou alumínio) e oxigênio e subcamadas de octaedros compostos por átomos de alumínio (ou ferro e magnésio) e oxigênio. Há uma classificação dos argilominerais em função da disposição das subcamadas, a qual considera a razão entre as subcamadas tetraédrica e octaédrica, respectivamente. Por exemplo, um mineral formado por uma subcamada tetraédrica e uma octaédrica é classificado como argilomineral do tipo 1:1. Se houver duas subcamadas tetraédricas e uma octaédrica, o material é classificado como mineral do tipo 2:1.Pode ainda haver substituições de alguns dos átomos nas estruturas que compõem o argilomineral. Quando átomos de Si 4+ são substituídos por Al 3+ na folha octaédrica, e átomos de Al 3+ são substituídos por Mg 2+ , o material fica com carga líquida negativa, que é contrabalanceada por íons metálicos como Na + , K + , Ca 2+ , etc., ou íons moleculares como NH 4 + , moléculas de surfactantes e corantes catiônicos, etc., presentes nas superfícies das partículas. A quantidade desses contra-íons pode ser medida e resulta na capacidade de troca catiônica (ctc) da argila, expressa usualmente em miliequivalentes do íon para cada 100 g de argila (meq/100 g). As montmorilonitas, por exemplo, possuem ctc que podem variar de 70 até 170 meq/100 g. 13 Outra característica de algumas argilas é a sua capacidade de adsorção de moléculas de água na superfície das camadas, fazendo com que haja um inchamento e provocando a dispersão das mesmas, quando há água suficiente para isso. No entanto, geralmente essa dispers...

show abstract

“…Some organic cations (such as MB) can form dimers, trimers and even higher order of aggregates in solution (Spencer and Sutter 1979;Cenens and Shoonheydt 1988). Aggregation of molecules, which may be considered a proportion of added dye, reduces the concentration of monomer, Xi +.…”

Section: Adsorption Modelingmentioning

confidence: 99%

Sorption of Selected Cationic and Neutral Organic Molecules on Palygorskite and Sepiolite

Shariatmadari

Mermut

Benke

1999

Clays and clay miner.

View full text Add to dashboard Cite

Abstract--Palygorskite and sepiolite show a high sorption capacity for organic molecules. Adsorption of 2 organic cations, methylene blue (MB) and crystal violet (CV), by palygorskite and sepiolite were examined. The maximum sorption of MB and CV far exceeded the cation exchange capacity (CEC) of these minerals. This shows that, besides the contribution of free negative sorption sites (P), the sites satisfied with sorption of single cations (PXi ~ and neutral sorption sites (N) on clay surfaces may contribute to the sorption of organic cations. The number of neutral sites was determined by examining the sorption of 2 neutral organic molecules, triton-X 100 (TXI00) and 15 crown ether 5 (15C5), and by application of the Langmuir isotherm.To determine the contribution of different sites, an adsorption model that applies the Gouy-Chapman equation and takes into account the formation of different clay-organic complexes in a closed system was employed. Application of this model to sorption data provided the calculation of binding coefficients for neutral sites, as well as the surface potential of the minerals at different sorbate concentrations.At sorption maxima, for both palygorskite and sepiolite, the contribution of neutral sites for sorption of organic cations was the highest, followed by the PXi ~ sites in case of CV sorption, while in sorption of MB the contribution of P-sites was the second highest. The Fourier transform infrared (FTIR) patterns of clay-organic cation complexes compared with pure clays confirm that the sorption of organic cations is by silanol groups located at the edge of fibrous crystals, which account for neutral sorption sites.

show abstract

Visible Spectroscopy of Methylene Blue on Hectorite, Laponite B, and Barasym in Aqueous Suspension

Cited by 310 publications

References 29 publications

Comparative Adsorption of Methylene Blue on Different Low Cost Adsorbents by Continuous Column Process

Comparative Adsorption of Methylene Blue on Different Low Cost Adsorbents by Continuous Column Process

Adsorção do corante azul de metileno em partículas de argilominerais: análise dos tamanhos das partículas

Sorption of Selected Cationic and Neutral Organic Molecules on Palygorskite and Sepiolite

Contact Info

Product

Resources

About