The preparation of carboxylic-functional carbon-based nanofibers for the removal of cationic pollutants

Zhao, Xin; Ma, Xiaofei; Zheng, Pengwu

doi:10.1016/j.chemosphere.2018.03.131

Cited by 37 publications

(11 citation statements)

References 47 publications

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“…O pH e a  foram os que tiveram maiores efeitos sobre GOT e os efeitos de T, t e R não foram estatisticamente significativos (p < 0,05). Zhao et al (2018), também observaram que meios mais ácidos levaram à valores mais altos de GOT. Portanto, maiores velocidades de agitação levaram a maiores conversões de reações de formação de GOT (Li et al, 2018).…”

Section: Resultados E Discussõesunclassified

“…10.25 ± 0.08 g 9 9.61 ± 0.05 h 10 7.22 ± 0.09 i Os hidrocarvões apresentam valores de SBET relativamente pequenos em comparação a outros materiais adsorventes cujas áreas são, geralmente, maiores que 800 m²/g (Zhou et al, 2017). No entanto, muitos pesquisadores relataram que um fator chave na adsorção de muitos poluentes é a ocorrência de ligações químicas entre grupos funcionais e adsorventes, o que torna a área de superfície adsorvente e a estrutura porosa menos importante (Zhao et al, 2018).…”

Section: Resultados E Discussõesunclassified

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CARBONIZAçãO HIDROTéRMICA DOS RESíDUOS DE ACEROLA (MALPHIGIA EMARGINATA D.C.): INFLUêNCIA DAS VARIáVEIS DE PROCESSO

Souza¹,

Barrozo²,

Barbosa³

et al. 2019

Blucher Chemical Engineering Proceedings

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Section: Resultados E Discussõesunclassified

CARBONIZAçãO HIDROTéRMICA DOS RESíDUOS DE ACEROLA (MALPHIGIA EMARGINATA D.C.): INFLUêNCIA DAS VARIáVEIS DE PROCESSO

Souza¹,

Barrozo²,

Barbosa³

et al. 2019

Blucher Chemical Engineering Proceedings

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“…The introduction of citric acid till 1.0 g increased adsorption capacity and later decreased upon the addition of another 0.5 g. Therefore, the optimal condition for introduction is during the preparation of the fibers. The removal efficiency of Pb(II) ions decreased from 80.93% to 70.32% after five adsorption–desorption cycles . Another study by functionalizing oxolane‐2,5‐dione, increased the surface area by 4.24 times.…”

Section: Removal Of Heavy Metal Ionsmentioning

confidence: 99%

“…The removal efficiency of Pb(II) ions decreased from 80.93% to 70.32% after five adsorption-desorption cycles. [47] Another study by functionalizing oxolane-2,5-dione, increased the surface area by 4.24 times. The enhanced surface area lead to the accommodation of ≈500 times percentage increase in Pb(II) ions adsorption and ≈3000 times percentage increase in Cd(II) ions adsorption on the surface.…”

Section: Biopolymermentioning

confidence: 99%

Bio‐Based Nanofibers Involved in Wastewater Treatment

Gandavadi

Sundarrajan

Ramakrishna

2019

Macro Materials & Eng

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Studies involving bio‐based nanofibers are well utilized in the field of energy, catalysis, electronics, and environmental science. In this review, the importance of utilizing bio‐based materials for the development and optimization of multiplexed nanofibers and the modifications adopted to overcome the drawbacks of conventional electro‐spinning to facilitate better production rates, enhanced adsorption, and its potential in removing heavy metal ions, dyes, and other contaminants polluting the environment are highlighted. This work provides the readers the ability to understand the complexity in fabrication of bio‐based nanofibers focusing primarily on chitosan, cellulose, and protein‐based nanofibers and their mechanism toward quenching/degradation of water contaminants. In addition, it also provides the advantages of using bio‐based materials over synthetic materials for the development of nanofibers.

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“…At high temperatures, the nanofibers tend to relax to reach a state of minimized energy, resulting in shrinkage and bending of the nanofibers if the mats are not fixed during this process. One of the materials most often used for the creation of carbon nanofibers is polyacrylonitrile (PAN) [21][22][23][24][25]. While some authors report on stretching nanofibers-which are mostly prepared from PAN--during heating as a chance to further enhance the mechanical properties [26][27][28][29], others suggest different possibilities to fix nanofiber mats during stabilization and carbonization [30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Wet Relaxation of Electrospun Nanofiber Mats

et al. 2019

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Electrospinning can be used to produce nanofiber mats. One of the often used polymers for electrospinning is polyacrylonitrile (PAN), especially for the production of carbon nanofibers, but also for a diverse number of other applications. For some of these applications—e.g., creation of nano-filters—the dimensional stability of the nanofiber mats is crucial. While relaxation processes—especially dry, wet and washing relaxation—are well-known and often investigated for knitted fabrics, the dimensional stability of nanofiber mats has not yet been investigated. Here we report on the wet relaxation of PAN nanofiber mats, which are dependent on spinning and solution parameters such as: voltage, electrode distance, nanofiber mat thickness, and solid content in the solution. Our results show that wet relaxation has a significant effect on the samples, resulting in a dimensional change that has to be taken into account for nanofiber mats in wet applications. While the first and second soaking in pure water resulted in an increase of the nanofiber mat area up to approximately 5%, the dried sample, after the second soaking, conversely showed an area reduced by a maximum of 5%. For soaking in soap water, small areal decreases between approximately 1–4% were measured.

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The preparation of carboxylic-functional carbon-based nanofibers for the removal of cationic pollutants

Cited by 37 publications

References 47 publications

CARBONIZAçãO HIDROTéRMICA DOS RESíDUOS DE ACEROLA (MALPHIGIA EMARGINATA D.C.): INFLUêNCIA DAS VARIáVEIS DE PROCESSO

CARBONIZAçãO HIDROTéRMICA DOS RESíDUOS DE ACEROLA (MALPHIGIA EMARGINATA D.C.): INFLUêNCIA DAS VARIáVEIS DE PROCESSO

Bio‐Based Nanofibers Involved in Wastewater Treatment

Wet Relaxation of Electrospun Nanofiber Mats

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