1
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Xue Y, Jia Y, Liu S, Yuan S, Ma R, Ma Q, Fan J, Zhang WX. Electrochemical reduction of wastewater by non-noble metal cathodes: From terminal purification to upcycling recovery. JOURNAL OF HAZARDOUS MATERIALS 2023; 459:132106. [PMID: 37506648 DOI: 10.1016/j.jhazmat.2023.132106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 07/18/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023]
Abstract
A shift beyond conventional environmental remediation to a sustainable pollutant upgrading conversion is extremely desirable due to the rising demand for resources and widespread chemical contamination. Electrochemical reduction processes (ERPs) have drawn considerable attention in recent years in the fields of oxyanion reduction, metal recovery, detoxification and high-value conversion of halogenated organics and benzenes. ERPs also have the potential to address the inherent limitations of conventional chemical reduction technologies in terms of hydrogen and noble metal requirements. Fundamentally, mechanisms of ERPs can be categorized into three main pathways: direct electron transfer, atomic hydrogen mediation, and electrode redox pairs. Furthermore, this review consolidates state-of-the-art non-noble metal cathodes and their performance comparable to noble metals (e.g., Pd, Pt) in electrochemical reduction of inorganic/organic pollutants. To overview the research trends of ERPs, we innovatively sort out the relationship between the electrochemical reduction rate, the charge of the pollutant, and the number of electron transfers based on the statistical analysis. And we propose potential countermeasures of pulsed electrocatalysis and flow mode enhancement for the bottlenecks in electron injection and mass transfer for electronegative pollutant reduction. We conclude by discussing the gaps in the scientific and engineering level of ERPs, and envisage that ERPs can be a low-carbon pathway for industrial wastewater detoxification and valorization.
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Affiliation(s)
- Yinghao Xue
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, PR China
| | - Yan Jia
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, PR China
| | - Shuan Liu
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, PR China
| | - Shiyin Yuan
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, PR China
| | - Raner Ma
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, PR China
| | - Qian Ma
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, PR China
| | - Jianwei Fan
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, PR China.
| | - Wei-Xian Zhang
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, PR China
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2
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Teng J, Peydayesh M, Lu J, Zhou J, Benedek P, Schäublin RE, You S, Mezzenga R. Amyloid-Templated Palladium Nanoparticles for Water Purification by Electroreduction. Angew Chem Int Ed Engl 2022; 61:e202116634. [PMID: 35040240 PMCID: PMC9306645 DOI: 10.1002/anie.202116634] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Indexed: 12/16/2022]
Abstract
Electrocatalysis offers great promise for water purification but is limited by low active area and high uncontrollability of electrocatalysts. To overcome these constraints, we propose hybrid bulk electrodes by synthesizing and binding a Pd nanocatalyst (nano-Pd) to the electrodes via amyloid fibrils (AFs). The AFs template is effective for controlling the nucleation, growth, and assembly of nano-Pd on the electrode. In addition, the three-dimensional hierarchically porous nanostructure of AFs is beneficial for loading high-density nano-Pd with a large active area. The novel hybrid cathodes exhibit superior electroreduction performance for the detoxification of hexavalent chromium (Cr6+ ), 4-chlorophenol, and trichloroacetic acid in wastewater and drinking water. This study provides a proof-of-concept design of an AFs-templated nano-Pd-based hybrid electrode, which constitutes a paradigm shift in electrocatalytic water purification, and broadens the horizon of its potential engineered applications.
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Affiliation(s)
- Jie Teng
- State Key Laboratory of Urban Water Resource and EnvironmentSchool of EnvironmentHarbin Institute of TechnologyNo. 73, Huanghe RoadNangang District, Harbin150090P. R. China
- Department of Health Sciences & TechnologyETH ZurichSchmelzbergstrasse 98092ZurichSwitzerland
| | - Mohammad Peydayesh
- Department of Health Sciences & TechnologyETH ZurichSchmelzbergstrasse 98092ZurichSwitzerland
| | - Jiandong Lu
- State Key Laboratory of Urban Water Resource and EnvironmentSchool of EnvironmentHarbin Institute of TechnologyNo. 73, Huanghe RoadNangang District, Harbin150090P. R. China
| | - Jiangtao Zhou
- Department of Health Sciences & TechnologyETH ZurichSchmelzbergstrasse 98092ZurichSwitzerland
| | - Peter Benedek
- Department of Information Technology and Electrical EngineeringETH Zurich8092ZurichSwitzerland
| | - Robin E. Schäublin
- Scientific Center for Optical and Electron Microscopy (ScopeM)ETH ZurichOtto-Stern-Weg 38093ZurichSwitzerland
| | - Shijie You
- State Key Laboratory of Urban Water Resource and EnvironmentSchool of EnvironmentHarbin Institute of TechnologyNo. 73, Huanghe RoadNangang District, Harbin150090P. R. China
| | - Raffaele Mezzenga
- Department of Health Sciences & TechnologyETH ZurichSchmelzbergstrasse 98092ZurichSwitzerland
- Department of MaterialsETH ZurichWolfgang Pauli Strasse 108093ZurichSwitzerland
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3
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Ma JF, Hou YN, Guo J, Sharif HMA, Huang C, Zhao J, Li H, Song Y, Lu C, Han Y, Zhang Y, Wang AJ. Rational design of biogenic Pd xAu y nanoparticles with enhanced catalytic performance for electrocatalysis and azo dyes degradation. ENVIRONMENTAL RESEARCH 2022; 204:112086. [PMID: 34562479 DOI: 10.1016/j.envres.2021.112086] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 09/14/2021] [Accepted: 09/17/2021] [Indexed: 06/13/2023]
Abstract
The green biogenic PdAu nanoparticles (bio-PdAu NPs) exhibits remarkable catalytic performance in hydrogenation, which is highly desired. However, the catalytic principles and effectiveness of bio-PdxAuy NPs in response to various catalytic systems (electrocatalysis and suspension-catalysis) are unclear. Herein, a facile synthetic strategy for bio-PdxAuy NPs synthesis with controlled size and the catalytic principles for hydrogen evolution reaction (HER) and azo dye degradation is reported. In the biosynthetic process, the size and composition of the bio-PdxAuy NPs could be precisely controlled by predesigning the precursor mass ratio of Pd/Au, and the Au proportion showed a linear relationship with the size of NPs (R2 = 0.92). The obtained bio-PdxAuy NPs exhibit variable activity in electrocatalysis (HER) and suspension-catalysis (azo dye degradation). For electrocatalysis, the formation of conductive networks that facilitates the extracellular electron transfer is crucial. It was revealed that the bio-Pd2Au8 exhibited superior electrocatalytic performance in HER/toward hydrogen evolution, with a maximum current density of 1.65 mA cm-2, which was 1.54 times higher than that commercial Pd/C (1.07 mA cm-2). The high electrocatalytic activity was attributed to its appropriate size (81.38 ± 6.14 nm) and uniform distribution on the cell surface, which promoted the extracellular electron transfer by constructing a conductive network between catalyst and electrode. However, for suspension-catalysis, the size effect and synergistic effect of bimetallic NPs have a more prominent effect on the degradation of azo dyes. As the increase of Au proportion the particle size decreases, and the catalytic activity of bio-PdxAuy improved significantly. The response principles of bio-PdxAuy proposed in this study provide a reliable reference for the rational design of bio-based bimetallic catalysts with enhanced catalytic performance.
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Affiliation(s)
- Jin-Feng Ma
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China; National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Ya-Nan Hou
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China; National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.
| | - Jianbo Guo
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China.
| | | | - Cong Huang
- National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Jianhai Zhao
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China
| | - Haibo Li
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China
| | - Yuanyuan Song
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China
| | - Caicai Lu
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China
| | - Yi Han
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China
| | - Yousuo Zhang
- CCCC-TDC Harbour Construction Engineering Co., Ltd., Huanggu Dongheng street 8#, Tianjin, 300450, China
| | - Ai-Jie Wang
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
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4
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Teng J, Peydayesh M, Lu J, Zhou J, Benedek P, Schäublin R, You S, Mezzenga R. Amyloid‐Templated Palladium Nanoparticles for Water Purification by Electroreduction. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202116634] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jie Teng
- ETH Zurich: Eidgenossische Technische Hochschule Zurich HEST SWITZERLAND
| | - Mohammad Peydayesh
- ETH Zurich: Eidgenossische Technische Hochschule Zurich HEST SWITZERLAND
| | - Jiandong Lu
- Harbin Institute of Technology school of environment CHINA
| | - Jiangtao Zhou
- ETH Zurich: Eidgenossische Technische Hochschule Zurich HEST SWITZERLAND
| | - Peter Benedek
- ETH Zurich: Eidgenossische Technische Hochschule Zurich Information Technology and Electrical Engineering SWITZERLAND
| | - Robin Schäublin
- ETH Zurich: Eidgenossische Technische Hochschule Zurich scopeM SWITZERLAND
| | - Shijie You
- Harbin Institute of Technology School of Environment CHINA
| | - Raffaele Mezzenga
- ETH Zurich Food & Soft Materials Science Schmelzbergstrasse 9, LFO, E23 8092 Zürich SWITZERLAND
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5
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Zhou D, Luo YH, Zheng CW, Long M, Long X, Bi Y, Zheng X, Zhou C, Rittmann BE. H 2-Based Membrane Catalyst-Film Reactor (H 2-MCfR) Loaded with Palladium for Removing Oxidized Contaminants in Water. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:7082-7093. [PMID: 33900089 DOI: 10.1021/acs.est.1c01189] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Scalable applications of precious-metal catalysts for water treatment face obstacles in H2-transfer efficiency and catalyst stability during continuous operation. Here, we introduce a H2-based membrane catalyst-film reactor (H2-MCfR), which enables in situ reduction and immobilization of a film of heterogeneous Pd0 catalysts that are stably anchored on the exterior of a nonporous H2-transfer membrane under ambient conditions. In situ immobilization had >95% yield of Pd0 in controllable forms, from isolated single atoms to moderately agglomerated nanoparticles (averaging 3-4 nm). A series of batch tests documented rapid Pd-catalyzed reduction of a wide spectrum of oxyanions (nonmetal and metal) and organics (e.g., industrial raw materials, solvents, refrigerants, and explosives) at room temperature, owing to accurately controlled H2 supply on demand. Reduction kinetics and selectivity were readily controlled through the Pd0 loading on the membranes, H2 pressure, and pH. A 45-day continuous treatment of trichloroethene (TCE)-contaminated water documented removal fluxes up to 120 mg-TCE/m2/d with over 90% selectivity to ethane and minimal (<1.5%) catalyst leaching or deactivation. The results support that the H2-MCfR is a potentially sustainable and reliable catalytic platform for reducing oxidized water contaminants: simple synthesis of an active and versatile catalyst that has long-term stability during continuous operation.
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Affiliation(s)
- Dandan Zhou
- Engineering Lab for Water Pollution Control and Resources Recovery of Jilin Province, School of Environment, Northeast Normal University, Changchun 130021, China
| | - Yi-Hao Luo
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona 85287-5701, United States
| | - Chen-Wei Zheng
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona 85287-5701, United States
| | - Min Long
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona 85287-5701, United States
| | - Xiangxing Long
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona 85287-5701, United States
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Arizona State University, Tempe, Arizona 85287-5701, United States
| | - Yuqiang Bi
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Arizona State University, Tempe, Arizona 85287-5701, United States
| | - Xiong Zheng
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Chen Zhou
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona 85287-5701, United States
| | - Bruce E Rittmann
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona 85287-5701, United States
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Arizona State University, Tempe, Arizona 85287-5701, United States
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6
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Ilunga AK, Mamba BB, Nkambule TT. Methyl orange degradation enhanced by hydrogen spillover onto platinum nanocatalyst surface. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.6050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Ali K. Ilunga
- Nanotechnology and Water Sustainability (NanoWS) Research Unit University of South Africa (UNISA Science Campus) Florida (Johannesburg) PO Box 392 South Africa
| | - Bhekie B. Mamba
- Nanotechnology and Water Sustainability (NanoWS) Research Unit University of South Africa (UNISA Science Campus) Florida (Johannesburg) PO Box 392 South Africa
| | - Thabo T.I. Nkambule
- Nanotechnology and Water Sustainability (NanoWS) Research Unit University of South Africa (UNISA Science Campus) Florida (Johannesburg) PO Box 392 South Africa
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7
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Najem M, Nada AA, Weber M, Sayegh S, Razzouk A, Salameh C, Eid C, Bechelany M. Palladium/Carbon Nanofibers by Combining Atomic Layer Deposition and Electrospinning for Organic Pollutant Degradation. MATERIALS 2020; 13:ma13081947. [PMID: 32326154 PMCID: PMC7215890 DOI: 10.3390/ma13081947] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/14/2020] [Accepted: 04/16/2020] [Indexed: 11/23/2022]
Abstract
As organic dyes are a major source of pollution, it is important to develop novel and efficient heterogeneous catalysts with high activity for their degradation. In this work, two innovative techniques, atomic layer deposition and electrospinning, were used to prepare palladium nanoparticles (Pd NPs) supported on carbon nanofibers (CNFs). The sample morphology was investigated using scanning and transmission electron microscopy. This showed the presence of nanofibers of several micrometers in length and with a mean diameter of 200 nm. Moreover, the size of the highly dispersed Pd NPs was about 7 nm. X-ray photoelectron spectroscopy visually validated the inclusion of metallic Pd. The prepared nano-catalysts were then used to reduce methyl orange (MO) in the presence of sodium borohydride (NaBH4). The Freundlich isotherm model was the most suitable model to explain the adsorption equilibrium for MO onto the Pd/CNF catalysts. Using 5 mL MO dye-solution (0.0305 mM) and 1 mL NaBH4 (0.026 mM), a 98.9% of catalytic activity was achieved in 240 min by 0.01 g of the prepared nano-catalysts Pd/C (0.016 M). Finally, no loss of catalytic activity was observed when such catalysts were used again. These results represent a promising avenue for the degradation of organic pollutants and for heterogeneous catalysis.
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Affiliation(s)
- Melissa Najem
- Institut Européen des Membranes, IEM–UMR 5635, ENSCM, CNRS, University Montpellier, 34730 Montpellier, France; (M.N.); (A.A.N.); (M.W.); (S.S.); (C.S.)
| | - Amr A. Nada
- Institut Européen des Membranes, IEM–UMR 5635, ENSCM, CNRS, University Montpellier, 34730 Montpellier, France; (M.N.); (A.A.N.); (M.W.); (S.S.); (C.S.)
- Department of Analysis and Evaluation, Egyptian Petroleum Research Institute, Cairo, Nasr City P.B. 11727, Egypt
| | - Matthieu Weber
- Institut Européen des Membranes, IEM–UMR 5635, ENSCM, CNRS, University Montpellier, 34730 Montpellier, France; (M.N.); (A.A.N.); (M.W.); (S.S.); (C.S.)
| | - Syreina Sayegh
- Institut Européen des Membranes, IEM–UMR 5635, ENSCM, CNRS, University Montpellier, 34730 Montpellier, France; (M.N.); (A.A.N.); (M.W.); (S.S.); (C.S.)
- Laboratory of Chemical Analyses, Faculty of Sciences 2, Lebanese University, Fanar B.P. 90656, Lebanon;
| | - Antonio Razzouk
- Laboratory of Chemical Analyses, Faculty of Sciences 2, Lebanese University, Fanar B.P. 90656, Lebanon;
| | - Chrystelle Salameh
- Institut Européen des Membranes, IEM–UMR 5635, ENSCM, CNRS, University Montpellier, 34730 Montpellier, France; (M.N.); (A.A.N.); (M.W.); (S.S.); (C.S.)
| | - Cynthia Eid
- EC2M, Faculty of Science 2, Fanar Campus, Lebanese University, Fanar B.P. 90656, Lebanon;
| | - Mikhael Bechelany
- Institut Européen des Membranes, IEM–UMR 5635, ENSCM, CNRS, University Montpellier, 34730 Montpellier, France; (M.N.); (A.A.N.); (M.W.); (S.S.); (C.S.)
- Correspondence:
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8
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Ma H, Li S, Wang H, Schneider WF. Water-Mediated Reduction of Aqueous N-Nitrosodimethylamine with Pd. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:7551-7563. [PMID: 31244058 DOI: 10.1021/acs.est.9b01425] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Pd-catalyzed reduction has emerged as a promising treatment strategy to remove the recalcitrant disinfection byproduct N-nitrosodimethylamine (NDMA). However, the reaction pathways remain unexplored, and questions remain about how water solvent influences NDMA reduction mechanisms and selectivity. Here, we compute the energies and barriers of all relevant elementary steps in NDMA reduction by H2 on Pd(111) using density functional theory. We further calculate water-assisted H-shuttling for all hydrogenation reactions explicitly and include water solvation for all elementary reactions implicitly. We parametrize microkinetic models to predict product formation rates and selectivities over a wide range of NDMA concentrations. We show that H2O-mediated H-shuttling lowers the reaction barriers for all hydrogenation reactions involved in NDMA reduction while implicit solvation has negligible impact on the reaction and activation energies. We further conduct batch experiments with SiO2-supported Pd nanoparticles and compare them with the microkinetic models. The predicted rates, selectivity, and apparent activation energy from the model parametrized with both explicit H2O-mediated H-shuttling and implicit solvation correspond well with experimental observations. Models that ignore water as an H-shuttle or solvent fail to recover the experimental rates and apparent activation energy. We identified the rate-determining steps of the reaction and show the reaction flow pathways of the complicated reaction network. Finally, we demonstrate that water-mediated H-shuttling changes the rate-determining steps and reaction flows of elementary reactions.
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Affiliation(s)
- Hanyu Ma
- Department of Chemical and Biomolecular Engineering , University of Notre Dame , Notre Dame , Indiana 46556 , United States
| | - Sichi Li
- Department of Chemical and Biomolecular Engineering , University of Notre Dame , Notre Dame , Indiana 46556 , United States
| | - Haitao Wang
- School of Environmental Science and Technology , Nankai University , Tianjin 300350 , PR China
| | - William F Schneider
- Department of Chemical and Biomolecular Engineering , University of Notre Dame , Notre Dame , Indiana 46556 , United States
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9
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Jiang SF, Xi KF, Yang J, Jiang H. Biochar-supported magnetic noble metallic nanoparticles for the fast recovery of excessive reductant during pollutant reduction. CHEMOSPHERE 2019; 227:63-71. [PMID: 30981971 DOI: 10.1016/j.chemosphere.2019.04.044] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 03/25/2019] [Accepted: 04/06/2019] [Indexed: 06/09/2023]
Abstract
The catalytic reduction of diverse pollutants by noble metal catalysts in the presence of reductants is a highly effective and widely used method. However, the considerable cost of noble metal catalysts impedes the practical application of this method, and the recovery of excessive reductants has not been reported previously. In this work, we prepared inexpensive biochar-supported magnetic noble metallic nanoparticles (NPs) and efficiently recovered the excessive reductants in the form of H2. The as-synthesized biochar-supported noble metallic NPs exhibited high H2 recovery during the 4-nitrophenol reduction reaction. Results showed that the catalysts with low noble metallic content have higher H2 recovery rate than commercial Pd/C, Ag/C, and Pt/C. The catalytic mechanism of magnetic biochar-supported noble metallic NPs was demonstrated to be a "synergetic effect", where biochar and Fe3O4 acted as accelerants that enable noble metallic NPs to produce active hydrogen for the reduction reaction, and the excess active hydrogen atoms combined to form H2.
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Affiliation(s)
- Shun-Feng Jiang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Kun-Fang Xi
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Jing Yang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Hong Jiang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China.
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10
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Ilunga AK, Khoza T, Tjabadi E, Meijboom R. Effective Catalytic Reduction of Methyl Orange Catalyzed by the Encapsulated Random Alloy Palladium-Gold Nanoparticles Dendrimer. ChemistrySelect 2017. [DOI: 10.1002/slct.201701631] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Ali K. Ilunga
- Department of Chemistry; University of Johannesburg, PO Box; 524 Auckland Park 2006 Johannesburg South Africa
| | - Thembisile Khoza
- Department of Biochemistry; University of Johannesburg, PO Box; 524, Auckland Park 2006 Johannesburg South Africa
| | - Evah Tjabadi
- Department of Chemistry; University of Johannesburg, PO Box; 524 Auckland Park 2006 Johannesburg South Africa
| | - Reinout Meijboom
- Department of Chemistry; University of Johannesburg, PO Box; 524 Auckland Park 2006 Johannesburg South Africa
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11
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Cho DW, Kwon G, Ok YS, Kwon EE, Song H. Reduction of Bromate by Cobalt-Impregnated Biochar Fabricated via Pyrolysis of Lignin Using CO 2 as a Reaction Medium. ACS APPLIED MATERIALS & INTERFACES 2017; 9:13142-13150. [PMID: 28362484 DOI: 10.1021/acsami.7b00619] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this study, pyrolysis of lignin impregnated with cobalt (Co) was conducted to fabricate a Co-biochar (i.e., Co/lignin biochar) for use as a catalyst for bromate (BrO3-) reduction. Carbon dioxide (CO2) was employed as a reaction medium in the pyrolysis to induce desired effects associated with CO2; (1) the enhanced thermal cracking of volatile organic compounds (VOCs) evolved from the thermal degradation of biomass, and (2) the direct reaction between CO2 and VOCs, which resulted in the enhanced generation of syngas (i.e., H2 and CO). This study placed main emphases on three parts: (1) the role of impregnated Co in pyrolysis of lignin in the presence of CO2, (2) the characterization of Co/lignin biochar, and (3) evaluation of catalytic capability of Co-lignin biochar in BrO3- reduction. The findings from the pyrolysis experiments strongly evidenced that the desired CO2 effects were strengthened due to catalytic effect of impregnated Co in lignin. For example, the enhanced generation of syngas from pyrolysis of Coimpregnated lignin in CO2 was more significant than the case without Co impregnation. Moreover, pyrolysis of Coimpregnated lignin in CO2 led to production of biochar of which surface area (599 m2 g-1) is nearly 100 times greater than the biochar produced in N2 (6.6 m2 g-1). Co/lignin biochar produced in CO2 also showed a great performance in catalyzing BrO3- reduction as compared to the biochar produced in N2.
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Affiliation(s)
- Dong-Wan Cho
- Department of Environment and Energy, Sejong University , Seoul 05006, South Korea
| | - Gihoon Kwon
- Department of Environment and Energy, Sejong University , Seoul 05006, South Korea
| | - Yong Sik Ok
- School of Natural Resources and Environmental Science & Korea Biochar Research Center, Kangwon National University , Chuncheon 24341, South Korea
| | - Eilhann E Kwon
- Department of Environment and Energy, Sejong University , Seoul 05006, South Korea
| | - Hocheol Song
- Department of Environment and Energy, Sejong University , Seoul 05006, South Korea
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12
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Duan L, Li M, Liu H. Biosynthesised palladium nanoparticles using
Eucommia ulmoides
bark aqueous extract and their catalytic activity. IET Nanobiotechnol 2015; 9:349-54. [DOI: 10.1049/iet-nbt.2015.0020] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Liansheng Duan
- College of Chemistry and Chemical EngineeringWuhan Textile UniversityWuhan 430073People's Republic of China
- College of Chemistry and BiologyHubei University of EducationWuhan 430205People's Republic of China
| | - Ming Li
- College of Chemistry and Chemical EngineeringWuhan Textile UniversityWuhan 430073People's Republic of China
| | - Huihong Liu
- College of Chemistry and Chemical EngineeringWuhan Textile UniversityWuhan 430073People's Republic of China
- Hubei Key Laboratory of Low Dimensional Optoelectronic Material and DevicesHubei University of Arts and SciencesXiangyangHubei 440053People's Republic of China
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13
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Vargas R, Borrás C, Méndez D, Mostany J, Scharifker BR. Electrochemical oxygen transfer reactions: electrode materials, surface processes, kinetic models, linear free energy correlations, and perspectives. J Solid State Electrochem 2015. [DOI: 10.1007/s10008-015-2984-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Wang Y, Liu J, Wang P, Werth CJ, Strathmann TJ. Palladium Nanoparticles Encapsulated in Core–Shell Silica: A Structured Hydrogenation Catalyst with Enhanced Activity for Reduction of Oxyanion Water Pollutants. ACS Catal 2014. [DOI: 10.1021/cs500971r] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Yin Wang
- Department
of Civil and Environmental Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Jinyong Liu
- Department
of Civil and Environmental Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Peng Wang
- Water
Desalination and Reuse Center, Biological and Environmental Sciences
and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Charles J. Werth
- Department
of Civil and Environmental Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Timothy J. Strathmann
- Department
of Civil and Environmental Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
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15
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Radjenovic J, Flexer V, Donose BC, Sedlak DL, Keller J. Removal of the X-ray contrast media diatrizoate by electrochemical reduction and oxidation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:13686-13694. [PMID: 24261992 DOI: 10.1021/es403410p] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Due to their resistance to biological wastewater treatment, iodinated X-ray contrast media (ICM) have been detected in municipal wastewater effluents at relatively high concentrations (i.e., up to 100 μg L(-1)), with hospitals serving as their main source. To provide a new approach for reducing the concentrations of ICMs in wastewater, electrochemical reduction at three-dimensional graphite felt and graphite felt doped with palladium nanoparticles was examined as a means for deiodination of the common ICM diatrizoate. The presence of palladium nanoparticles significantly enhanced the removal of diatrizoate and enabled its complete deiodination to 3,5-diacetamidobenzoic acid. When the system was employed in the treatment of hospital wastewater, diatrizoate was reduced, but the extent of electrochemical reduction decreased as a result of competing reactions with solutes in the matrix. Following electrochemical reduction of diatrizoate to 3,5-diacetamidobenzoic acid, electrochemical oxidation with boron-doped diamond (BDD) anodes was employed. 3,5-Diacetamidobenzoic acid disappeared from solution at a rate that was similar to that of diatrizoate, but it was more readily mineralized than the parent compound. When electrochemical reduction and oxidation were coupled in a three-compartment reactor operated in a continuous mode, complete deiodination of diatrizoate was achieved at an applied cathode potential of -1.7 V vs SHE, with the released iodide ions electrodialyzed in a central compartment with 80% efficiency. The resulting BDD anode potential (i.e., +3.4-3.5 V vs SHE) enabled efficient oxidation of the products of the reductive step. The presence of other anions (e.g., chloride) was likely responsible for a decrease in I(-) separation efficiency when hospital wastewater was treated. Reductive deiodination combined with oxidative degradation provides benefits over oxidative treatment methods because it does not produce stable iodinated intermediates. Nevertheless, the process must be further optimized for the conditions encountered in hospital wastewater to improve the separation efficiency of halide ions prior to the electrooxidation step.
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Affiliation(s)
- Jelena Radjenovic
- Advanced Water Management Centre, The University of Queensland , Queensland 4072, Australia
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16
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Hutchison JM, Poust SK, Kumar M, Cropek DM, Macallister IE, Arnett CM, Zilles JL. Perchlorate reduction using free and encapsulated Azospira oryzae enzymes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:9934-9941. [PMID: 23924304 DOI: 10.1021/es402081b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Existing methods for perchlorate remediation are hampered by the common co-occurrence of nitrate, which is structurally similar and a preferred electron acceptor. In this work, the potential for perchlorate removal using cell-free bacterial enzymes as biocatalysts was investigated using crude cell lysates and soluble protein fractions of Azospira oryzae PS, as well as soluble protein fractions encapsulated in lipid and polymer vesicles. The crude lysates showed activities between 41 700 to 54 400 U L(-1) (2.49 to 3.06 U mg(-1) total protein). Soluble protein fractions had activities of 15 400 to 29 900 U L(-1) (1.70 to 1.97 U mg(-1)) and still retained an average of 58.2% of their original activity after 23 days of storage at 4 °C under aerobic conditions. Perchlorate was removed by the soluble protein fraction at higher rates than nitrate. Importantly, perchlorate reduction occurred even in the presence of 500-fold excess nitrate. The soluble protein fraction retained its function after encapsulation in lipid or polymer vesicles, with activities of 13.8 to 70.7 U L(-1), in agreement with theoretical calculations accounting for the volume limitation of the vesicles. Further, encapsulation mitigated enzyme inactivation by proteinase K. Enzyme-based technologies could prove effective at perchlorate removal from water cocontaminated with nitrate or sulfate.
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Affiliation(s)
- Justin M Hutchison
- Department of Civil and Environmental Engineering, University of Illinois , Urbana, Illinois 61801, United States
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17
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Shuai D, McCalman DC, Choe JK, Shapley JR, Schneider WF, Werth CJ. Structure Sensitivity Study of Waterborne Contaminant Hydrogenation Using Shape- and Size-Controlled Pd Nanoparticles. ACS Catal 2013. [DOI: 10.1021/cs300616d] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Danmeng Shuai
- Department
of Civil and Environmental Engineering, ‡Department of Chemistry, and §Center of Advanced
Materials for the Purification of Water with Systems, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
- Department
of Chemical and Biomolecular Engineering, ∥Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame,
Indiana 46556, United States
| | - Dorrell C. McCalman
- Department
of Civil and Environmental Engineering, ‡Department of Chemistry, and §Center of Advanced
Materials for the Purification of Water with Systems, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
- Department
of Chemical and Biomolecular Engineering, ∥Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame,
Indiana 46556, United States
| | - Jong Kwon Choe
- Department
of Civil and Environmental Engineering, ‡Department of Chemistry, and §Center of Advanced
Materials for the Purification of Water with Systems, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
- Department
of Chemical and Biomolecular Engineering, ∥Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame,
Indiana 46556, United States
| | - John R. Shapley
- Department
of Civil and Environmental Engineering, ‡Department of Chemistry, and §Center of Advanced
Materials for the Purification of Water with Systems, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
- Department
of Chemical and Biomolecular Engineering, ∥Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame,
Indiana 46556, United States
| | - William F. Schneider
- Department
of Civil and Environmental Engineering, ‡Department of Chemistry, and §Center of Advanced
Materials for the Purification of Water with Systems, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
- Department
of Chemical and Biomolecular Engineering, ∥Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame,
Indiana 46556, United States
| | - Charles J. Werth
- Department
of Civil and Environmental Engineering, ‡Department of Chemistry, and §Center of Advanced
Materials for the Purification of Water with Systems, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
- Department
of Chemical and Biomolecular Engineering, ∥Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame,
Indiana 46556, United States
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18
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Zhang R, Shuai D, Guy KA, Shapley JR, Strathmann TJ, Werth CJ. Elucidation of Nitrate Reduction Mechanisms on a Pd-In Bimetallic Catalyst using Isotope Labeled Nitrogen Species. ChemCatChem 2012. [DOI: 10.1002/cctc.201200457] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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19
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Gusseme BD, Soetaert M, Hennebel T, Vanhaecke L, Boon N, Verstraete W. Catalytic dechlorination of diclofenac by biogenic palladium in a microbial electrolysis cell. Microb Biotechnol 2012; 5:396-402. [PMID: 22221490 PMCID: PMC3821682 DOI: 10.1111/j.1751-7915.2011.00325.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Accepted: 12/06/2011] [Indexed: 12/01/2022] Open
Abstract
Diclofenac is one of the most commonly detected pharmaceuticals in wastewater treatment plant (WWTP) effluents and the receiving water bodies. In this study, biogenic Pd nanoparticles ('bio-Pd') were successfully applied in a microbial electrolysis cell (MEC) for the catalytic reduction of diclofenac. Hydrogen gas was produced in the cathodic compartment, and consumed as a hydrogen donor by the bio-Pd on the graphite electrodes. In this way, complete dechlorination of 1 mg diclofenac l(-1) was achieved during batch recirculation experiments, whereas no significant removal was observed in the absence of the biocatalyst. The complete dechlorination of diclofenac was demonstrated by the concomitant production of 2-anilinophenylacetate (APA). Through the addition of -0.8 V to the circuit, continuous and complete removal of diclofenac was achieved in synthetic medium at a minimal HRT of 2 h. Continuous treatment of hospital WWTP effluent containing 1.28 µg diclofenac l(-1) resulted in a lower removal efficiency of 57%, which can probably be attributed to the affinity of other environmental constituents for the bio-Pd catalyst. Nevertheless, reductive catalysis coupled to sustainable hydrogen production in a MEC offers potential to lower the release of micropollutants from point-sources such as hospital WWTPs.
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Affiliation(s)
- Bart De Gusseme
- Laboratory of Microbial Ecology and Technology (LabMET), Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B‐9000 Gent, Belgium
| | - Maarten Soetaert
- Laboratory of Microbial Ecology and Technology (LabMET), Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B‐9000 Gent, Belgium
| | - Tom Hennebel
- Laboratory of Microbial Ecology and Technology (LabMET), Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B‐9000 Gent, Belgium
| | - Lynn Vanhaecke
- Laboratory of Chemical Analysis, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B‐9820 Merelbeke, Belgium
| | - Nico Boon
- Laboratory of Microbial Ecology and Technology (LabMET), Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B‐9000 Gent, Belgium
| | - Willy Verstraete
- Laboratory of Microbial Ecology and Technology (LabMET), Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B‐9000 Gent, Belgium
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20
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Radjenović J, Farré MJ, Mu Y, Gernjak W, Keller J. Reductive electrochemical remediation of emerging and regulated disinfection byproducts. WATER RESEARCH 2012; 46:1705-1714. [PMID: 22265615 DOI: 10.1016/j.watres.2011.12.042] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Revised: 12/14/2011] [Accepted: 12/18/2011] [Indexed: 05/31/2023]
Abstract
Long-term exposure to low concentrations of disinfection byproducts (DBPs) in drinking water has been associated with increased human-health risks of bladder cancer and adverse reproductive outcomes. In this study, we investigated electrochemical reduction utilizing a resin-impregnated graphite cathode for the degradation of 17 DBPs (i.e. halomethanes, haloacetonitriles, halopropanones, chloral hydrate and trichloronitromethane) at low μg L(-1) concentration levels. The reduction experiments were potentiostatically controlled at cathode potentials -700, -800 and -900 mV vs Standard Hydrogen Electrode (SHE) during 24 h. At the lowest potential applied (i.e. -900 mV vs SHE), the disappearance of DBPs from the solution after 24 h of reduction was >70%, except for chloroform (32%), 1,1-dichloropropanone (48%), and chloral hydrate (31%). Due to the participation of several removal mechanisms (e.g. electrochemical reduction, adsorption, volatilization and/or hydrolysis) it was not possible to distinguish the removal efficiencies of electrochemical reduction of individual compounds. Adsorption of the more hydrophilic DBPs (i.e. haloacetonitriles, chloral hydrate, and 1,1-dichloropropanone) onto the electrode seems to be affected by the cathode polarization, as the removals observed in the open circuit experiments were significantly higher than the ones obtained in electrochemical reduction under the same conditions. The overall efficiency of reduction was estimated based on the analyses of the released Cl(-), Br(-) and I(-) ions. Nearly complete C-I bond cleavage was achieved at all three potentials applied, and from the theoretically predicted release of I(-) ions, calculated based on the removed DBPs, 86 ± 9 to 92 ± 1% was measured in the catholyte solution at -700 to -900 mV vs SHE. Debromination efficiencies obtained were 74 ± 3, 79 ± 6 and 68 ± 4% at -700, -800 and -900 mV vs SHE, while for C-Cl bond cleavage the obtained values were 69 ± 1, 72 ± 1 and 76 ± 4%, respectively. Nevertheless, dechlorination efficiencies are to be considered as approximate, since an increase in Cl(-) concentration was observed in the open circuit experiments due to the hydrolysis of some of the chlorine-containing DBPs. Although the Coulombic efficiencies for DPBs dehalogenation were only 1.9 ± 0.3 (-900 mV vs SHE) -4.1 ± 0.2% (-700 mV vs SHE), relatively low energy consumption of the process was observed, estimated at 72 ± 2 Wh m(-3) at -900 mV vs SHE for the concentration range of DBPs in this study (i.e. 65.3-129.7 μg L(-1)). The study demonstrated that reductive electrochemical treatment has the potential to be a modern remediation technology for the removal of low concentrations of halogenated DBPs in water.
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Affiliation(s)
- Jelena Radjenović
- The University of Queensland, QLD Advanced Water Management Centre, Brisbane, Queensland 4072, Australia.
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21
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Chaplin BP, Reinhard M, Schneider WF, Schüth C, Shapley JR, Strathmann TJ, Werth CJ. Critical review of Pd-based catalytic treatment of priority contaminants in water. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:3655-3670. [PMID: 22369144 DOI: 10.1021/es204087q] [Citation(s) in RCA: 201] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Catalytic reduction of water contaminants using palladium (Pd)-based catalysts and hydrogen gas as a reductant has been extensively studied at the bench-scale, but due to technical challenges it has only been limitedly applied at the field-scale. To motivate research that can overcome these technical challenges, this review critically analyzes the published research in the area of Pd-based catalytic reduction of priority drinking water contaminants (i.e., halogenated organics, oxyanions, and nitrosamines), and identifies key research areas that should be addressed. Specifically, the review summarizes the state of knowledge related to (1) proposed reaction pathways for important classes of contaminants, (2) rates of contaminant reduction with different catalyst formulations, (3) long-term sustainability of catalyst activity with respect to natural water foulants and regeneration strategies, and (4) technology applications. Critical barriers hindering implementation of the technology are related to catalyst activity (for some contaminants), stability, fouling, and regeneration. New developments overcoming these limitations will be needed for more extensive field-scale application of this technology.
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Affiliation(s)
- Brian P Chaplin
- Department of Civil and Environmental Engineering, Villanova University, Villanova, Pennsylvania 19085, United States
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22
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Shuai D, Choe JK, Shapley JR, Werth CJ. Enhanced activity and selectivity of carbon nanofiber supported Pd catalysts for nitrite reduction. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:2847-2855. [PMID: 22295991 DOI: 10.1021/es203200d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Pd-based catalyst treatment represents an emerging technology that shows promise to remove nitrate and nitrite from drinking water. In this work we use vapor-grown carbon nanofiber (CNF) supports in order to explore the effects of Pd nanoparticle size and interior versus exterior loading on nitrite reduction activity and selectivity (i.e., dinitrogen over ammonia production). Results show that nitrite reduction activity increases by 3.1-fold and selectivity decreases by 8.0-fold, with decreasing Pd nanoparticle size from 1.4 to 9.6 nm. Both activity and selectivity are not significantly influenced by Pd interior versus exterior CNF loading. Consequently, turnover frequencies (TOFs) among all CNF catalysts are similar, suggesting nitrite reduction is not sensitive to Pd location on CNFs nor Pd structure. CNF-based catalysts compare favorably to conventional Pd catalysts (i.e., Pd on activated carbon or alumina) with respect to nitrite reduction activity and selectivity, and they maintain activity over multiple reduction cycles. Hence, our results suggest new insights that an optimum Pd nanoparticle size on CNFs balances faster kinetics with lower ammonia production, that catalysts can be tailored at the nanoscale to improve catalytic performance for nitrite, and that CNFs hold promise as highly effective catalyst supports in drinking water treatment.
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Affiliation(s)
- Danmeng Shuai
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
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23
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De Gusseme B, Hennebel T, Vanhaecke L, Soetaert M, Desloover J, Wille K, Verbeken K, Verstraete W, Boon N. Biogenic palladium enhances diatrizoate removal from hospital wastewater in a microbial electrolysis cell. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:5737-5745. [PMID: 21663047 DOI: 10.1021/es200702m] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
To decrease the load of pharmaceuticals to the environment, decentralized wastewater treatment has been proposed for important point-sources such as hospitals. In this study, a microbial electrolysis cell (MEC) was used for the dehalogenation of the iodinated X-ray contrast medium diatrizoate. The presence of biogenic palladium nanoparticles (bio-Pd) in the cathode significantly enhanced diatrizoate removal by direct electrochemical reduction and by reductive catalysis using the H(2) gas produced at the cathode of the MEC. Complete deiodination of 3.3 μM (2 mg L(-1)) diatrizoate from a synthetic medium was achieved after 24 h of recirculation at an applied voltage of -0.4 V. An equimolar amount of the deiodinated metabolite 3,5-diacetamidobenzoate (DAB) was detected. Higher cell voltages increased the dehalogenation rates, resulting in a complete removal after 2 h at -0.8 V. At this cell voltage, the MEC was also able to remove 85% of diatrizoate from hospital effluent containing 0.5 μM (292 μg L(-1)), after 24 h of recirculation. Complete removal was obtained when the effluent was continuously fed at a volumetric loading rate of 204 mg diatrizoate m(-3) total cathodic compartment (TCC) day(-1) to the MEC with a hydraulic retention time of 8 h. At -0.8 V, the MEC system could also eliminate 54% of diatrizoate from spiked urine during a 24 h recirculation experiment. The final product DAB was demonstrated to be removable by nitrifying biomass, which suggests that the combination of a MEC and bio-Pd in its cathode offers potential to dehalogenate pharmaceuticals, and to significantly lower the environmental burden of hospital waste streams.
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Affiliation(s)
- Bart De Gusseme
- Laboratory of Microbial Ecology and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Gent, Belgium
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