Characterization of GMZ bentonite and its application in the adsorption of Pb(II) from aqueous solutions

Wang, Suowei; Dong, Yunhui; He, Manli; Chen, Lei; Yu, Xiaojiao

doi:10.1016/j.clay.2008.07.028

Cited by 179 publications

(61 citation statements)

References 32 publications

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“…That might be attributed to the greater selectivity of anionic sulfate groups of the resin for Na + cations than that for organic cations 23 since Na + ions are smaller in size in comparison to organic cations and hence the mobility of Na + is higher than organic cations 24 . Similar results represented by Wang 25 . For more explanation, the electrostatic interaction plays an essential role in the ion exchange technique.…”

Section: Effect Of Ionic Strengthsupporting

confidence: 77%

Adsorption Behavior of some N-alkyl Pyridinium Salts from Aqueous Solution on Amberlite-IR 120 H+ resin

2018

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The effect of Amberlite-IR 120 H + resin to remove some organic compounds (N-alkyl pyridinium salts) from aqueous solutions at certain conditions was investigated. The effect of resin dosage, contact time, adsorbate concentration, ionic strength and solution temperature on the adsorption efficiency was examined. The experimental data collected generally proved that the adsorption efficiency decreased as the alkyl chain increased. The thermodynamic equilibrium parameters of the adsorption processes were evaluated and showed that the adsorption process is spontaneous, disordered and exothermic. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D.R) isotherm models were applied based on the batch method. Freundlich, Temkin and D. R gave bilinear segments model based on the adsorbate initial concentrations except that for compound III where it gave straight of one segment for Temkin adsorption isotherm. Overall, Amberlite-IR 120 H + resin is effective in removing some N-alkyl pyridinium salts from an aqueous solution.

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Section: Effect Of Ionic Strengthsupporting

confidence: 77%

Adsorption Behavior of some N-alkyl Pyridinium Salts from Aqueous Solution on Amberlite-IR 120 H+ resin

2018

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“…3. The absorption band at 3621 cm −1 was due to the stretching vibration of structural OH group (Al-OH) of Na + -bentonite; the bands at 3432 and 1631 cm −1 corresponded to the stretching and bending vibrations of H 2 O, respectively; the band at 1045 cm −1 represented the stretching vibration of Si-O, while the band corresponding to Al-Al-OH bending vibration was observed at 921 cm −1 ; the band at 790 cm −1 implied quartz admixture in the samples; the bands at 528 and 466 cm −1 were associated with the bending vibrations of Si-O-Mg and Si-O-Fe, respectively (Eren and Afsin, 2008;Liu et al, 2010;Wang et al, 2009;Yuan et al, 2008). After clay was pillared, the amount of OH groups (H-OH and Al-OH) increased markedly on account of the much stronger absorption at 1631, 3432 and 3621 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Catalytic wet peroxide oxidation of 4-chlorophenol over Al-Fe-, Al-Cu-, and Al-Fe-Cu-pillared clays: Sensitivity, kinetics and mechanism

Zhou

Zhang

et al. 2014

Applied Clay Science

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Al-Fe-, Al-Cu-, and Al-Fe-Cu-PILCs were synthesized, characterized and tested in the catalytic wet peroxide oxidation of 4-chlorophenol (4-CP). An apparent induction period followed by a rapid oxidation was observed during the Fenton-like reaction, and the whole reaction could be modeled well using a Fermi's kinetic equation (R 2 = 0.9938~0.9993). The generation of hydroxyl radicals (HO • ) from surface-catalyzed decomposition of H 2 O 2 was the oxidation cause whereas the dissolution of active metals was its result. Accordingly, induction period was the cause of heterogeneous surface activation (catalysis or modification) for more HO • formed by decreasing pH. 4-CP oxidation proceeded via 4-chlorocatechol (major) and hydroquinone (minor) pathways, along the formation of main intermediate (5-chloro-1,2,4-benzentriol). Finally besides CO 2 , H 2 O and Cl − two main compounds (I and II) formed, where the former was identified as 2,4-dioxopentanedioic acid whereas the latter as ferric-oxalate complex. There were marked structural and active differences between Al-Fe-PILC and Al-Cu-PILC in which compared to the latter, the former possessed higher SSA and activity but its optimal calcination temperature was lower and the induction time was also longer. In addition, compound II accounted for a considerable proportion in Al-Fe-PILC system whereas compound I was almost only component in Al-Cu-PILC system.

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“…As bandas na faixa de 3400-3500 cm -1 e 1642 cm -1 foram atribuídas ao modo de vibração de alongamento de água absorvida pelas argilas [3]. Absorção em torno de 1030 cm -1 foi referente ao estiramento Si-O da folha tetraédrica [26]. deformação angular do Si-O-Al e em torno de 464 cm -1 do Si-O-Si [27].…”

Section: Figura 2: Difratogramas De Raios X Das Amostras Arg1 (A) E Aunclassified

Argila natural aplicada à clarificação de óleo lubrificante automotivo usado

et al. 2017

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ResumoArgilas para o processo de clarificação são largamente utilizadas na indústria de rerrefino de óleos lubrificantes usados, principalmente por sua capacidade adsorvente de reter impurezas. O presente estudo teve objetivo de determinar as condições ótimas do processo de clarificação de lubrificantes usados a partir de argilas naturais e realizar a recuperação de tais argilas. O processo de rerrefino do lubrificante usado foi otimizado a partir de um planejamento experimental. As argilas recuperadas não apresentaram mudanças significativas em suas estruturas originais, de acordo com as técnicas de difração de raios X, espectroscopia no infravermelho e análise termogravimétrica. Os resultados das caracterizações dos lubrificantes atenderam a portaria ANP nº 130, que regulamenta sua comercialização no país. Todos os solventes foram recuperados por destilação a vácuo. Palavras-chave: clarificação, lubrificante automotivo, argila natural. AbstractClarification process using clays is widely used in the used lubricating oils re-refining industry, mainly because of its adsorbent capacity to retain impurities. This study aimed to the determination of optimal conditions for used lubricating oil clarification process, using natural clays as well as its recovery to be re-used to the process. The re-refining process of used lubricating oil was optimized from experimental design. Recovered clays showed no significant changes in their original structures, according to the X-ray diffraction, infrared spectroscopy, and thermogravimetric analyzes. The results of used lubricating oil characterizations were in accordance to the ANP resolution n o 130, which regulates its commercialization in the country. All solvents were recovered by vacuum distillation.

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Characterization of GMZ bentonite and its application in the adsorption of Pb(II) from aqueous solutions

Cited by 179 publications

References 32 publications

Adsorption Behavior of some N-alkyl Pyridinium Salts from Aqueous Solution on Amberlite-IR 120 H+ resin

Adsorption Behavior of some N-alkyl Pyridinium Salts from Aqueous Solution on Amberlite-IR 120 H+ resin

Catalytic wet peroxide oxidation of 4-chlorophenol over Al-Fe-, Al-Cu-, and Al-Fe-Cu-pillared clays: Sensitivity, kinetics and mechanism

Argila natural aplicada à clarificação de óleo lubrificante automotivo usado

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