Optimization, isotherm, kinetic and thermodynamic studies of Pb(II) ions adsorption onto N-maleated chitosan-immobilized TiO 2 nanoparticles from aqueous media

Shaker, Medhat A.; Yakout, Amr A.

doi:10.1016/j.saa.2015.10.027

Cited by 38 publications

(17 citation statements)

References 56 publications

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“…2.1-20.9 kJ mol −1 , while the heats of chemisorption generally fall into a range of 80-200 kJ mol −1 . Therefore, as presented in Tables 3S (1)(2)(3)(4), it seems that adsorption of dye molecules by impregnated carbons can be attributed to a physical adsorption, better described by the Freundlich isotherm model, rather than a pure chemical adsorption process. The positive values of ΔS 0 indicate the affinity of the adsorbent towards the adsorbate species and suggest increased randomness at the solid/solution interface with some structural changes in the adsorbate and the adsorbent 42 as well.…”

Section: Effect Of Initial Dye Concentration (Isotherms)mentioning

confidence: 94%

“…Thermodynamic analysis was also carried out based on the change of Gibbs free energy (ΔG 0 , kJ mol −1 ), enthalpy (ΔH 0 , kJ mol −1 ) and entropy (ΔS 0 , kJ mol −1 K). The thermodynamic parameters, at pH = 10 and for selected RB5 concentrations (Co) are presented in Tables 3S (1)(2)(3)(4). From the tables it can be observed that all adsorbents (B, Bm, Bma and Bmi) present negative ΔG 0 values showing the spontaneous adsorption of RB5.…”

Section: Effect Of Initial Dye Concentration (Isotherms)mentioning

confidence: 99%

“…Textile industry wastewaters containing toxic dyes, that are irresponsibly discharged into rivers and oceans result in serious damage to water resources and contribute to environmental pollution . Dyes can affect human bodies via food resources and/or skin contacts, so that decrease of their concentration to values lower than a threshold limit is an important environmental and major health issue, as well …”

Section: Introductionmentioning

confidence: 99%

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Effective impregnation for the preparation of magnetic mesoporous carbon: application to dye adsorption

Saroyan

Giannakoudakis

Sarafidis

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND In this study, magnetic mesoporous activated carbons were synthesized either via co‐precipitation of iron salts onto activated carbon or via impregnation of activated carbon with magnetic nanoparticles by sonication. The resulting impregnated carbons were examined as adsorbents for the removal of Reactive Black 5 (RB5) from aqueous solutions. RESULTS The magnetic nanocomposites were characterized by various techniques (nitrogen adsorption, Fourier transform infrared spectroscopy, X‐ray diffraction, vibrating sample magnetometry, and scanning electron microscope measurements). The results of characterization analyses revealed that co‐precipitation was unsuccessful for the preparation of magnetic carbon while sonication led to a super‐paramagnetic activated carbon. Adsorption studies revealed that although magnetic carbon presented a decreased adsorption capacity compared with raw carbon, it was an acceptable dye adsorbent. High pH and high ionic strength values favored dye adsorption, while the data of adsorption isotherms and kinetics were better fitted by the Freundlich isotherm model and the pseudo‐second‐order kinetic model, respectively. Regeneration of dye‐loaded activated carbons by thermal re‐activation and re‐use of regenerated samples were also investigated. CONCLUSION Mesoporous magnetic activated carbon, with a saturation magnetization of 18 emu g−1, was successfully synthesized by sonication of activated carbon and magnetite nanoparticles. The magnetic carbon was found to be an adequate dye adsorbent with a maximum adsorption capacity of 445.294 mg g−1. © 2017 Society of Chemical Industry

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Section: Effect Of Initial Dye Concentration (Isotherms)mentioning

confidence: 94%

Section: Effect Of Initial Dye Concentration (Isotherms)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effective impregnation for the preparation of magnetic mesoporous carbon: application to dye adsorption

Saroyan

Giannakoudakis

Sarafidis

et al. 2017

J of Chemical Tech & Biotech

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“…The derived value of kf were shown at Table 1. However, the high kf value indicated high adsorption capacity [17].…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 96%

Isotherm Study on the Adsorption of Cadmium (II) onto Hydroxyapatite from Sea Shells Synthesized by Low Temperature Hydrothermal Method

Fadli¹,

Yenti²,

Zultiniar³

et al. 2016

Proceeding of the First International Conference on Technology, Innovation and Society

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The release of Cadmium (Cd 2+ ) ion onto the water as a result of industrial activities and its waste stream causes a negative impact on the environment and human health. The potential of synthesized HAp to remove Cd 2+ from aqueous solutions was investigated in a batch reactor under different experimental condition. Hydroxyapatite (HAp) were prepared from sea shells by low temperature hydrothermal method. This study also investigates the effects of process parameter such as initial concentration and adsorbent dosage to determine the appropriate model between Langmuir and Freundlich. The experimental results show that adsorption capacity (qe) increased with increasing initial concentration of Cd 2+ (Co). Initial concentration increased from ~20 to ~40 mg/L, qe increased from 19,24 to 37,32; 12,81 to 25,49 and 9,62 to 19,31 mg/g when adsorbent dosage was 1; 1,5 and 2 g/L respectively. The percentage of removal increased with increasing adsorbent dosage. Adsorbent dosage increases from 1 to 2 g/L, the adsorption percentage increased from 96,51 to 96,93; 96,79 to 97,06 and from 94,81 to 97,07% at the initial concentration of Cd 2+ ~20, 30 and 40 mg/L, respectively. The adsorption data described well by the Freundlich isotherm model, indicating heterogeneous adsorbent surface during adsorption of Cd 2+ onto Hap.

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“…10 Outro tipo de adsorvente, também eficaz e de baixo custo, o que viabiliza o processo, são os chamados bioadsorventes, no qual se podem destacar a quitosana e seus derivados. [11][12][13][14][15][16][17][18] A capacidade da quitosana em adsorver metais é devido principalmente à presença de grupos aminos(-NH2) que estão presentes em sua estrutura 19 e esta capacidade varia de acordo com a cristalinidade, afinidade por água, porcentagem de desacetilação e quantidade de grupos amino 20 . A quitosana, apesar de ter grande potencial, possui algumas limitações, como estabilidade mecânica baixa, baixa solubilidade, baixa porosidade, baixa resistência térmica e baixa área superficial.…”

Section: Introductionunclassified

Remoção de Níquel(II) e Cádmio(II) em N-Lauroil Quitosana em Soluções Aquosas: Cinética e Isotermas

et al. 2019

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Quitosana reagiu com cloreto de lauroil para obter o adsorvente N-Lauroil Quitosana(NLQ). O adsorvente foi usado para estudos de adsorção em solução aquosa de íons de níquel(II) e cádmium. Foram realizados estudos de pH, cinéticos e de equilíbrio. O pH ótimo observado foi de 5,0 e 5,5 para os íons de níquel(II) e cádmium(II), respectivamente. Dos estudos cinéticos, foi observada a cinética de pseudoprimeira ordem. Os dados da adsorção em equilíbrio foram analisados pelos modelos de Langmuir, Freudlinch e Tenkim. A capacidade máxima de adsorção (qmax) foram 20,1 e 49,3 mg g-1respectivamente para o níquel(II) e cádmio(II).

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Optimization, isotherm, kinetic and thermodynamic studies of Pb(II) ions adsorption onto N-maleated chitosan-immobilized TiO 2 nanoparticles from aqueous media

Cited by 38 publications

References 56 publications

Effective impregnation for the preparation of magnetic mesoporous carbon: application to dye adsorption

Effective impregnation for the preparation of magnetic mesoporous carbon: application to dye adsorption

Isotherm Study on the Adsorption of Cadmium (II) onto Hydroxyapatite from Sea Shells Synthesized by Low Temperature Hydrothermal Method

Remoção de Níquel(II) e Cádmio(II) em N-Lauroil Quitosana em Soluções Aquosas: Cinética e Isotermas

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