Removal of Cr(<scp>vi</scp>) from water using polypyrrole/attapulgite core–shell nanocomposites: equilibrium, thermodynamics and kinetics

Chen, Yong; Xu, Hui; Wang, Shiyu; Kang, Long

doi:10.1039/c3ra47351a

Cited by 53 publications

(20 citation statements)

References 16 publications

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“…25 It can be seen from ATP spectra that the peaks at 1086 cm À1 , 791 cm À1 and 565 cm À1 are respectively attributed to Si-O-Si stretching vibration and bending vibration. 8 Aer polymerization, the spectrum of PPy/Fe 3 O 4 /ATP composite clearly exhibits characteristic absorption peaks with respect to PPy, Fe 3 O 4 , ATP, which indicates the formation of PPy/Fe 3 O 4 /ATP composite. The phase purity and crystal structure of the samples have been identied by X-ray diffraction technique and the results are shown in Fig.…”

Section: Resultsmentioning

confidence: 94%

“…The rapid adsorption for Cr(VI) using PPy/Fe 3 O 4 /ATP as adsorbent may be attributed to the synergistic effect of PPy, Fe 3 O 4 and ATP. 8,31 This also indicates that the PPy/ Fe 3 O 4 /ATP composites is particularly suitable for Cr(VI) adsorbents.…”

Section: Adsorption Performance Of Ppy/fe 3 O 4 /Atp Compositementioning

confidence: 82%

“…log q e ¼ log K f + 1/n log c e (8) where c e (mg L À1 ) is the equilibrium concentration of Cr(VI) in water, q e (mg g À1 ) is the Cr(VI) amount adsorbed at equilibrium, q max (mg g À1 ) is the amount adsorbed onto the surface of adsorbent at equilibrium. The value of b (L mg À1 ) relates the heat of adsorption, while the Langmuir constants q max represent the adsorption capacity of monolayer adsorbent.…”

Section: Adsorption Isothermmentioning

confidence: 99%

“…6 Attapulgite (ATP) is a kind of crystalline hydrated magnesium aluminum silicate with unique brous three-dimensional structure, excellent chemical stability and strong adsorption. 7,8 However, ATP may easily agglomerate due to its large surface area, and therefore its adsorption efficiency becomes low.…”

Section: Introductionmentioning

confidence: 99%

“…The PPy/ATP were utilized as adsorbent for the removal of Cr(VI), which showed a maximum adsorption capacity of 46.14 mg g À1 . 8 Specically, conjugated PPy is a promising candidate due to its novel conjugated structure and redox properties, offering a rich electrochemical chain that undergoes ion doping and dedoping on the PPy nitrogen, which may additionally experience interaction and synergistic effect with metal oxides. 18 Inspired by the above analysis and based on our previous work of PPy-based composites.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Insight into the synergistic effect on adsorption for Cr(vi) by a polypyrrole-based composite

Sun

Zhang

et al. 2020

RSC Adv.

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show abstract

Section: Resultsmentioning

confidence: 94%

Section: Adsorption Performance Of Ppy/fe 3 O 4 /Atp Compositementioning

confidence: 82%

Section: Adsorption Isothermmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Insight into the synergistic effect on adsorption for Cr(vi) by a polypyrrole-based composite

Sun

Zhang

et al. 2020

RSC Adv.

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Amino‐Functionalized Multilayer Core–Shell Mesoporous Organosilica Nanospheres for Cr(VI) Removal

Lai

Sun

Hou

et al. 2018

Adv Materials Inter

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Developing low-cost and highly efficient adsorbents for the removal of toxic heavy metal ions has been the subject of intensive research with the increasingly stringent water pollution control standards. In this paper, three types of amino-functionalized multi-layer core-shell mesoporous organosilica nanospheres (MCMONs) have been synthesized using an indirect co-condensation method for Cr(VI) removal applications. Results show that amino groups have been successfully immobilized on the nanospheres and these amino-functionalized MCMONs exhibit unique organic-inorganic multi-layer core-shell structures . When used as adsorbent for Cr(VI) removal, our N-(3-trimethoxysilylpropyl)diethylenetriamine functionalized MCMONs exhibits an maximum adsorption capacity of 279.92 mg/g at initial Cr(VI) concentration of 150 mg/L. This is about 20% greater than the highest Cr(VI) adsorption capacity previously reported for other core-shell silica-based adsorbents, demonstrating the great potential of our MCMONs in Cr(VI) removal applications.

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Facile synthesis of coral cauliflower‐like polypyrrole hemispheres toward screening electromagnetic interference pollution

Kulkarni

Kandesar

Velhal

et al. 2021

J of Applied Polymer Sci

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In this study, coral cauliflower‐like polypyrrole (PPy) hemispheres are synthesized on an alumina substrate via a simple chemical oxidative polymerization route. The stony coral‐like morphology of PPy hemispheres acts as a conducting trap in absorbing electromagnetic (EM) radiation via multiple internal reflections. A PPy thin film deposited at 0.2 M pyrrole concentration shows a minimum reflection loss (RL) of −30.80 dB (99.9% microwave absorption) at the frequency of 14.2 GHz, and the highest total shielding effectiveness achieved is −18.3 dB at 16.8 GHz at 4.38 μm film thickness. The thin films exhibit excellent microwave absorption ability at low thicknesses, and the effective absorption bandwidth (RL < –10 dB) attains a high value of 2.2 GHz in the frequency range of 13–15.2 GHz. These findings can help researchers to enhance the EM wave absorption characteristics in a broad frequency region using lightweight intrinsically conducting polymers.

show abstract

Removal of Cr(vi) from water using polypyrrole/attapulgite core–shell nanocomposites: equilibrium, thermodynamics and kinetics

Cited by 53 publications

References 16 publications

Insight into the synergistic effect on adsorption for Cr(vi) by a polypyrrole-based composite

Insight into the synergistic effect on adsorption for Cr(vi) by a polypyrrole-based composite

Amino‐Functionalized Multilayer Core–Shell Mesoporous Organosilica Nanospheres for Cr(VI) Removal

Facile synthesis of coral cauliflower‐like polypyrrole hemispheres toward screening electromagnetic interference pollution

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