1
|
Lv X, Qin X, Wang K, Peng Y, Wang P, Jiang G. Nanoscale zero valent iron supported on MgAl-LDH-decorated reduced graphene oxide: Enhanced performance in Cr(VI) removal, mechanism and regeneration. JOURNAL OF HAZARDOUS MATERIALS 2019; 373:176-186. [PMID: 30921568 DOI: 10.1016/j.jhazmat.2019.03.091] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 02/25/2019] [Accepted: 03/20/2019] [Indexed: 06/09/2023]
Abstract
The scaled application of nanoscale zero-valent iron nanoparticles (nZVI or Fe° NPs) in environmental remediation is challenged by easy surface passivation and particle aggregation. To improve this situation and enhance their performance in Cr(VI) removal from water phase, we present one novel strategy to hybridize nZVI with layered double hydroxide (LDH) decorated reduced graphene oxide (rGO). The as-prepared ternary (Fe@LDH/rGO) composites possess better dispersibility, improved hydrophilicity and more positive surfaces that allows higher removal efficiency and capacity for Cr(VI) oxyanions. Composition proportion are optimized and influences of surroundings (solution pH, Cr(VI) concentration and temperature) are evaluated. Also, we demonstrate that Fe@LDH/rGO can be reused with suitable post-treatments, which combines alkaline solution desorption and NaBH4 revivification possess. Cr desorption and Fe leaching ratio during regeneration should be critical indicators that determine the recovery efficiency. Synergistic effect within this ternary system not only contributes to its superiorities in stability, but also continuous iron corrosion via the formation of micro Fe-C batteries, where rGO acts as cathode and alternative electron conductor. The present work suggests great potentials of Fe@LDH/rGO composites in groundwater remediation.
Collapse
Affiliation(s)
- Xiaoshu Lv
- Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
| | - Xiaofeng Qin
- Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
| | - Kaifeng Wang
- Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
| | - Yiyin Peng
- Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
| | - Peng Wang
- Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
| | - Guangming Jiang
- Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China.
| |
Collapse
|
2
|
Improved reductive transformation of iopromide by magnetite containing reduced graphene oxide nanosacks as electron shuttles. Colloids Surf A Physicochem Eng Asp 2019; 566:188-195. [PMID: 31662597 DOI: 10.1016/j.colsurfa.2019.01.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The novel application of magnetite containing reduced graphene oxide nanosacks (MrGO-N) as electron shuttles to improve the reductive degradation of pharmaceutical pollutant, iopromide (IOP), was evaluated. The MrGO-N were synthesized by ultrasonicated nebulization process, and their physicochemical characterization was performed by potentiometric titrations, zeta potential, high resolution transmission electron microscopy (HR-TEM), X-ray diffraction, as well as by Raman and Fourier transform infrared spectroscopies. Results demonstrated the thermal reduction of precursor graphene oxide sheets, the removal of different oxygenated groups, and the successful assembly of magnetite nanoparticles (MNP) in the graphene sacks. Also, reduction experiments revealed 72 % of IOP removal efficiency and up to 2.5-fold faster degradation of this pollutant performed with MrGO-N as redox catalysts in batch assays and with sulfide as electron donor. Chemical transformation pathway of IOP provides evidence of complete dehalogenation and further transformation of aromatic ring substituents. Greater redox-mediating ability of MrGO-N was observed, which was reflected in the catalytic activity of these nanomaterials during the reductive degradation of IOP. Transformation byproducts with simpler chemical structure were identified, which could lead to complete degradation by conventional methodologies in a complementary treatment process. Redox-mediating activity of MrGO-N could potentially be applied in wastewater treatment systems in order to facilitate the biodegradation of priority contaminants.
Collapse
|
3
|
Toral-Sánchez E, Rangel-Mendez JR, Hurt RH, Ascacio Valdés JA, Aguilar CN, Cervantes FJ. Novel application of magnetic nano-carbon composite as redox mediator in the reductive biodegradation of iopromide in anaerobic continuous systems. Appl Microbiol Biotechnol 2018; 102:8951-8961. [PMID: 30058007 DOI: 10.1007/s00253-018-9250-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 07/13/2018] [Accepted: 07/15/2018] [Indexed: 10/28/2022]
Abstract
The redox-mediating capacity of magnetic reduced graphene oxide nanosacks (MNS) to promote the reductive biodegradation of the halogenated pollutant, iopromide (IOP), was tested. Experiments were performed using glucose as electron donor in an upflow anaerobic sludge blanket (UASB) reactor under methanogenic conditions. Higher removal efficiency of IOP in the UASB reactor supplied with MNS as redox mediator was observed as compared with the control reactor lacking MNS. Results showed 82% of IOP removal efficiency under steady state conditions in the UASB reactor enriched with MNS, while the reactor control showed IOP removal efficiency of 51%. The precise microbial transformation pathway of IOP was elucidated by high-performance liquid chromatography coupled to mass spectroscopy (HPLC-MS) analysis. Biotransformation by-products with lower molecular weight than IOP molecule were identified in the reactor supplied with MNS, which were not detected in the reactor control, indicating the contribution of these magnetic nano-carbon composites in the redox conversion of this halogenated pollutant. Reductive reactions of IOP favored by MNS led to complete dehalogenation of the benzene ring and partial rupture of side chains of this pollutant, which is the first step towards its complete biodegradation. Possible reductive mechanisms that took place in the biodegradation of IOP were stated. Finally, the novel and successful application of magnetic graphene composites in a continuous bioreactor to enhance the microbial transformation of IOP was demonstrated.
Collapse
Affiliation(s)
- E Toral-Sánchez
- IPICYT/División de Ciencias Ambientales, Camino a la Presa San José 2055, Col. Lomas 4a. Sección, C.P. 78216, San Luis Potosí, SLP, Mexico
| | - J R Rangel-Mendez
- IPICYT/División de Ciencias Ambientales, Camino a la Presa San José 2055, Col. Lomas 4a. Sección, C.P. 78216, San Luis Potosí, SLP, Mexico
| | - Robert H Hurt
- School of Engineering/Institute for Molecular and Nanoscale Innovation (IMNI), Brown University, Providence, RI, 02912, USA
| | - Juan A Ascacio Valdés
- Food Research Department, School of Chemistry (DIA-UAdeC), Universidad Autónoma de Coahuila, 25280, Saltillo, Coahuila, Mexico
| | - Cristóbal N Aguilar
- Food Research Department, School of Chemistry (DIA-UAdeC), Universidad Autónoma de Coahuila, 25280, Saltillo, Coahuila, Mexico
| | - F J Cervantes
- IPICYT/División de Ciencias Ambientales, Camino a la Presa San José 2055, Col. Lomas 4a. Sección, C.P. 78216, San Luis Potosí, SLP, Mexico.
| |
Collapse
|
4
|
Khannanov A, Kiiamov A, Valimukhametova A, Tayurskii DA, Börrnert F, Kaiser U, Eigler S, Vagizov FG, Dimiev AM. γ-Iron Phase Stabilized at Room Temperature by Thermally Processed Graphene Oxide. J Am Chem Soc 2018; 140:9051-9055. [DOI: 10.1021/jacs.8b04829] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Artur Khannanov
- Laboratory for Advanced Carbon Nanomaterials, Kazan Federal University, Kazan 420008, Russian Federation
| | - Airat Kiiamov
- Laboratory for Advanced Carbon Nanomaterials, Kazan Federal University, Kazan 420008, Russian Federation
- Institute of Physics, Kazan Federal University, Kremlyovskaya str. 18, Kazan 420008, Russian Federation
| | - Alina Valimukhametova
- Laboratory for Advanced Carbon Nanomaterials, Kazan Federal University, Kazan 420008, Russian Federation
| | - Dmitrii A. Tayurskii
- Laboratory for Advanced Carbon Nanomaterials, Kazan Federal University, Kazan 420008, Russian Federation
- Institute of Physics, Kazan Federal University, Kremlyovskaya str. 18, Kazan 420008, Russian Federation
| | - Felix Börrnert
- Materialwissenschaftliche Elektronenmikroskopie, Universität Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Ute Kaiser
- Materialwissenschaftliche Elektronenmikroskopie, Universität Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Siegfried Eigler
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
| | - Farit G. Vagizov
- Institute of Physics, Kazan Federal University, Kremlyovskaya str. 18, Kazan 420008, Russian Federation
| | - Ayrat M. Dimiev
- Laboratory for Advanced Carbon Nanomaterials, Kazan Federal University, Kazan 420008, Russian Federation
| |
Collapse
|
5
|
Aerosol Synthesis of N and N-S Doped and Crumpled Graphene Nanostructures. NANOMATERIALS 2018; 8:nano8060406. [PMID: 29882781 PMCID: PMC6027206 DOI: 10.3390/nano8060406] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 05/29/2018] [Accepted: 05/30/2018] [Indexed: 11/19/2022]
Abstract
Chemically modified graphene–based materials (CMG) are currently attracting a vast interest in their application in different fields. In particular, heteroatom-doped graphenes have revealed great potentialities in the field of electrocatalysis as substitutes of fuel cell noble metal–based catalysts. In this work, we investigate an innovative process for doping graphene nanostructures. We optimize a novel synthetic route based on aerosol preparation, which allows the simultaneous doping, crumpling, and reduction of graphene oxide (GO). Starting from aqueous solutions containing GO and the dopant precursors, we synthesize N- and N,S-dual-doped 3D graphene nanostructures (N-cGO and N,S-cGO). In the aerosol process, every aerosol droplet can be considered as a microreactor where dopant precursors undergo thermal decomposition and react with the GO flakes. Simultaneously, thanks to the relatively high temperature, GO undergoes crumpling and partial reduction. Using a combination of spectroscopic and microscopic characterization techniques, we investigate the morphology of the obtained materials and the chemical nature of the dopants within the crumpled graphene sheets. This study highlights the versatility of the aerosol process for the design of new CMG materials with tailored electrocatalytic properties.
Collapse
|
6
|
Ren M, Qian X, Fang M, Yue D, Zhao Y. Ferric (hydr)oxide/mesoporous carbon composites as Fenton-like catalysts for degradation of phenol. RESEARCH ON CHEMICAL INTERMEDIATES 2018. [DOI: 10.1007/s11164-018-3358-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|