Adsorption of sodium dodecylsulfate on a hydrotalcite-like compound. Effect of temperature, pH and ionic strength

Pavan, Paulo César; Crepaldi, Eduardo L.; Gomes, Gilmar de Almeida; Valim, João Barros

doi:10.1016/s0927-7757(98)00847-4

Cited by 174 publications

(113 citation statements)

References 51 publications

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“…Indeed, the LDH-C20 particles arrange themselves in a non-uniform stacking of irregular hexagonal plate-like particles. Also, there appears to be an uneven surface and unshaped edges, probably as a consequence of the excess of anionic surfactants draped over the outer particle surfaces [52,54,55]. The successful exchange of these surfactants into the LDH layers was also confirmed by the FTIR spectra ( Figure 5).…”

Section: Muksing Et Al -Express Polymer Letters Vol5 No5 (2011) 4mentioning

confidence: 75%

Effect of surfactant alkyl chain length on the dispersion, and thermal and dynamic mechanical properties of LDPE/organo-LDH composites

Muksing¹,

Magaraphan²,

Coiai³

et al. 2011

Express Polym. Lett.

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Abstract. Low density polyethylene/layered double hydroxide (LDH) composites were prepared via melt compounding using different kinds of organo-LDHs and polyethylene-grafted maleic anhydride as the compatibilizer. The organo-LDHs were successfully prepared by converting a commercial MgAl-carbonate LDH into a MgAl-nitrate LDH, which was later modified by anion exchange with linear and branched sodium alkyl sulfates having different alkyl chain lengths (n c = 6, 12 and 20). It was observed that, depending on the size of the surfactant alkyl chain, different degrees of polymer chain intercalation were achieved, which is a function of the interlayer distance of the organo-LDHs, of the packing level of the alkyl chains, and of the different interaction levels between the surfactant and the polymer chains. In particular, when the number of carbon atoms of the surfactant alkyl chain is larger than 12, the intercalation of polymer chains in the interlayer space and depression of the formation of large aggregates of organo-LDH platelets are favored. A remarkable improvement of the thermal-oxidative degradation was evidenced for all of the composites; whereas only a slight increase of the crystallization temperature and no significant changes of both melting temperature and degree of crystallinity were achieved. By thermodynamic mechanical analysis, it was evidenced that a softening of the matrix is may be due to the plasticizing effect of the surfactant.

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Section: Muksing Et Al -Express Polymer Letters Vol5 No5 (2011) 4mentioning

confidence: 75%

Effect of surfactant alkyl chain length on the dispersion, and thermal and dynamic mechanical properties of LDPE/organo-LDH composites

Muksing¹,

Magaraphan²,

Coiai³

et al. 2011

Express Polym. Lett.

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“…(3 ... (5) According to the first order reaction condition a plot between in(A t -A 0 ) and time was constructed giving straight lines (Fig.3 a,b ) that the efficiency of trapping is remarkably increased at strong acidic (88%) and strong basic medium ( 77% ) which confirms that efficiency of organic herbicide capture ( carbaryl ) is catalysed by both of H + and OH -that means it could proceeds at acidic or basic conditions . From this plot, the activation enthalpy was found to be ΔH* = -314.6 KJ/mol & ΔG* = 51.4 KJ/ mol and ΔS* = 58.8 J/mol K. These thermodynamic activation parameters help to understand and support the proposed catalytic oxidative mechanism enhancing us to estimate how much the ease of such these reaction to occur spontaneously [15][16][17][18][19] .…”

Section: Order Of the Reactionmentioning

confidence: 82%

Computational Modeling and Nano-Synthesis of Graphene-Graphite Mixtures for Organic Pollutant Capture from Industrial Water-Drains

El‐Shenawy¹,

Atta²,

Kora³

et al. 2013

Orientjchem.

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Computational modeling and visualization studies were performed using computerized advanced programs. The theoretical investigations was succeeded to design Graphene-Graphite mixtures nano-surface catalyst to apply as nano-molecular sieving materials.The synthesized molecular sieving was carefully characterized by both of XRD and AFM to prove the internal structure of the new molecular sieving material. Capture efficiency towards some selected organic herbicides (such as carbaryl pesticide) was examined and investigated in presence of H 2 O 2 which loaded over material surface of G1-G2 (Graphene-Graphite mixture). Hydrogen peroxide was applied as oxidative environmentally friend agent to decompose organic pollutant. The nanosynthesized molecular sieving exhibited very good efficiency towards captures of organic pollutant from industrial water drains such as carbaryl insecticides. Some of the kinetic parameters were investigated in this article, results obtained indicate that, the rate of oxidative degradation of pesticides (carbaryl insecticides) were found to be pH-dependent. The mechanism was proposed and the activation parameters were calculated.

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“…LDH consists of the positively charged metal hydroxide layers with anions located in the interlayer for charge compensation of the cationic layers. Because of their potential application in wide range of areas such as catalyst precursors [6], anion exchangers [7], absorbents [8,9] and bio-active materials [10], LDHs have drawn increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic O2 evolution from water over Zn–Cr layered double hydroxides intercalated with inorganic anions

Hirata

Tadanaga

Tatsumisago

2015

Materials Research Bulletin

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Adsorption of sodium dodecylsulfate on a hydrotalcite-like compound. Effect of temperature, pH and ionic strength

Cited by 174 publications

References 51 publications

Effect of surfactant alkyl chain length on the dispersion, and thermal and dynamic mechanical properties of LDPE/organo-LDH composites

Effect of surfactant alkyl chain length on the dispersion, and thermal and dynamic mechanical properties of LDPE/organo-LDH composites

Computational Modeling and Nano-Synthesis of Graphene-Graphite Mixtures for Organic Pollutant Capture from Industrial Water-Drains

Photocatalytic O2 evolution from water over Zn–Cr layered double hydroxides intercalated with inorganic anions

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