Pyrolysis of polyaniline–poly(styrene sulfonate) hydrogels to prepare activated carbons for the adsorption of vitamin B12

Jia, Yujie; Jiang, Jianchun; Sun, Kening

doi:10.1016/j.jaap.2014.10.023

Cited by 12 publications

(8 citation statements)

References 38 publications

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“…The FTIR characteristic peaked at 1590 cm −1 thus belonging to the –NH 2 deformation vibration. This also indicated the successful N-functionalization on the Fe 3 O 4 surface [ 43 ]. Peaks at 1605, 1494, 1296, 1235, and 1148, 830 cm −1 were in good agreement with PANI [ 44 ], which disappeared in Fe 3 O 4 @N-mC due to the carbonization process.…”

Section: Resultsmentioning

confidence: 94%

Pulse electromagnetic fields enhance extracellular electron transfer in magnetic bioelectrochemical systems

Zhou

Liu

Wang

et al. 2017

Biotechnol Biofuels

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BackgroundMicrobial extracellular electron transfer (EET) is essential in driving the microbial interspecies interaction and redox reactions in bioelectrochemical systems (BESs). Magnetite (Fe3O4) and magnetic fields (MFs) were recently reported to promote microbial EET, but the mechanisms of MFs stimulation of EET and current generation in BESs are not known. This study investigates the behavior of current generation and EET in a state-of-the-art pulse electromagnetic field (PEMF)-assisted magnetic BES (PEMF-MBES), which was equipped with magnetic carbon particle (Fe3O4@N-mC)-coated electrodes. Illumina Miseq sequencing of 16S rRNA gene amplicons was also conducted to reveal the changes of microbial communities and interactions on the anode in response to magnetic field.ResultsPEMF had significant influences on current generation. When reactors were operated in microbial fuel cell (MFC) mode with pulse electromagnetic field (PEMF-MMFCs), power densities increased by 25.3–36.0% compared with no PEMF control MFCs (PEMF-OFF-MMFCs). More interestingly, when PEMF was removed, the power density dropped by 25.7%, while when PEMF was reintroduced, the value was restored to the previous level. Illumina sequencing of 16S rRNA gene amplicon and principal component analysis (PCA) based on operational taxonomic units (OTUs) indicate that PEMFs led to the shifts in microbial community and changes in species evenness that decreased biofilm microbial diversity. Geobacter spp. were found dominant in all anode biofilms, but the relative abundance in PEMF-MMFCs (86.1–90.0%) was higher than in PEMF-OFF-MMFCs (82.5–82.7%), indicating that the magnetic field enriched Geobacter on the anode. The current generation of Geobacter-inoculated microbial electrolysis cells (MECs) presented the same change regularity, the accordingly increase or decrease corresponding with switch of PEMF, which confirmed the reversible stimulation of PEMFs on microbial electron transfer.ConclusionThe pulse electromagnetic field (PEMF) showed significant influence on state-of-the-art pulse magnetic bioelectrochemical systems (PEMF-MBES) in terms of current generation and microbial ecology. EET was instantaneously and reversibly enhanced in MBESs inoculated with either mixed-culture or Geobacter. PEMF notably decreased bacterial and archaeal diversities of the anode biofilms in MMFCs via changing species evenness rather than species richness, and facilitated specific enrichment of exoelectrogenic bacteria (Geobacter) on the anode surface. This study demonstrates a new magnetic approach for understanding and facilitating microbial electrochemical activities. Electronic supplementary materialThe online version of this article (doi:10.1186/s13068-017-0929-3) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 94%

Pulse electromagnetic fields enhance extracellular electron transfer in magnetic bioelectrochemical systems

Zhou

Liu

Wang

et al. 2017

Biotechnol Biofuels

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“…It is obvious that the solution becomes clear after adsorption, and the membrane sheet shows deep red due to the adsorbed VB12. The adsorption mechanism mainly including electrostatic attraction, hydrophobic interaction, and hydrogen bonding is elaborated as follows . Generally, PVDF membrane surface shows negative zeta potential .…”

Section: Resultsmentioning

confidence: 99%

“…Although the concentration is low, with the effect of biological enrichment, it would have an irreversible effect on the environment . Nowadays, many studies have been focused on the removal and recovery of VB12 from aqueous solutions …”

Section: Introductionmentioning

confidence: 99%

“…In the previous literatures, there were many studies about the removal of VB12 with adsorption process. Thereinto, carbon materials, like mesoporous carbons, activated carbons prepared by pyrolyzation of hydrogel, mesoporous activated carbon fiber modified with cerium oxide, were widely used as absorbents. Besides, other materials like polymeric adsorbents and nanoclay were also employed in the adsorption separation of VB12.…”

Section: Introductionmentioning

confidence: 99%

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Poly(vinylidene fluoride) membranes fabricated by vapor‐induced phase separation (VIPS) for the adsorption removal of VB12 from aqueous solution

Wang

Huang

Chen

et al. 2019

J of Applied Polymer Sci

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Poly(vinylidene fluoride) (PVDF) membranes without any additives were fabricated by a vapor-induced phase separation method and applied to the adsorption separation of vitamin B12 (VB12) from aqueous solution. The effects of preparation conditions including PVDF concentration in dope, vapor humidity, and exposure time on the morphologies, mechanical strength, adsorption, and permeation performances are investigated in detail. The results indicate that the PVDF membranes have a uniform spongy structure without macrovoids. The lower polymer concentration, relatively higher humidity, and longer exposure time easily leads to the formation of larger polymer nodules in the membrane matrix and lower mechanical strength of membranes. The resulted PVDF membranes exhibit superior separation efficiency for both static and dynamic adsorption for VB12. In the ultrafiltration (adsorption)-regeneration cycles, the permeation flux remains above 2500 L m −2 h −1 bar −1 and the VB12 removal ratio is above 92% after six cycles. The prepared PVDF membranes show superior adsorption capacities to other traditional adsorbents (such as activated carbons, nanoclay, etc.) for VB12 removal.

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“…Activated carbon (AC), with high surface area, micro and nanopores as well as availability of appropriate active centers, [40][41][42] facilitate it as an excellent alternative absorber. Despite many researchers have studied the absorption of heavy metals by AC, [43][44][45] few literatures report the function of AC for oil/water separation and heavy metal ion absorption. Herein, a rough copper mesh was fabricated by a facile electrochemical etching method, which is cost effective and environmentally friendly, then sandwiching with AC layer between the meshes for a better oil/water separation and heavy metal ion absorption.…”

mentioning

confidence: 99%

Sandwiched meshes with superwettability for oil/water separation and heavy metal ion absorption

Dong

Yang

Qian

et al. 2020

Asia-Pacific J Chem Eng

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Oil/water separation and heavy metal ion adsorptions have become a worldwide challenge due to the global industrial development and its indiscriminate discharge. Large numbers of methods have been developed to solve the problems, among which using superwettability material to selective separation is one of an efficient approach. However, this method cannot adsorb the heavy metal ions from water. Herein, we developed superwettability meshes that can not only separate oil/water after modification but also adsorb heavy metal ions before modification, which is just sandwiching an adsorbent layer between the meshes. The results showed that this method can separate most of oil/water mixtures with high efficiency (higher than 95%) as well as favorable recyclability. Besides, it can separate oil/water emulsion easily. In addition, the carbon layer between the meshes can adsorb heavy metal ions such as Ni(II), Cr(VI) (in the form of Cr 2 O 7 2−), and Cd(II) with high adsorption efficiency. More importantly, the carbon layer can be replaced by any other powers such as metal-organic frameworks (MOFs) and magnetic particle to extend the applications. We believe that such a novel and simple approach can provide some new perspectives to settle the environmental problems.

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Pyrolysis of polyaniline–poly(styrene sulfonate) hydrogels to prepare activated carbons for the adsorption of vitamin B12

Cited by 12 publications

References 38 publications

Pulse electromagnetic fields enhance extracellular electron transfer in magnetic bioelectrochemical systems

Pulse electromagnetic fields enhance extracellular electron transfer in magnetic bioelectrochemical systems

Poly(vinylidene fluoride) membranes fabricated by vapor‐induced phase separation (VIPS) for the adsorption removal of VB12 from aqueous solution

Sandwiched meshes with superwettability for oil/water separation and heavy metal ion absorption

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