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Ajao V, Nam K, Chatzopoulos P, Spruijt E, Bruning H, Rijnaarts H, Temmink H. Regeneration and reuse of microbial extracellular polymers immobilised on a bed column for heavy metal recovery. WATER RESEARCH 2020; 171:115472. [PMID: 31931379 DOI: 10.1016/j.watres.2020.115472] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 12/20/2019] [Accepted: 01/03/2020] [Indexed: 06/10/2023]
Abstract
Microbial extracellular polymeric substances (EPS) have gained increasing attention for various water treatment applications. In this study, EPS produced from nitrogen-limited glycerol/ethanol-rich wastewater were used to recover Cu2+ and Pb2+ from aqueous solutions. Continuous flow-through tests were conducted on a column packed with silica gel coated with polyethyleneimine, to which EPS were irreversibly attached as shown by optical reflectometry. These immobilised EPS excellently adsorbed Cu2+ and Pb2+, with 99.9% of influent metal adsorbed before the breakthrough points. Metal desorption was achieved with 0.1M HCl, with an average recovery of 86% for Cu2+ and 90% recovery for Pb2+. For the first time, we successfully showed the possibility to regenerate and reuse the immobilised EPS for five adsorption-desorption cycles (using Cu2+ as an example) with no reduction in the adsorbed amount at the breakthrough point (qbp). Based on the mass balance of the associated metal ions participating in the adsorption process, ion exchange was identified as the major mechanism responsible for Cu2+ and Pb2+ adsorption by EPS. The results demonstrate the potential of wastewater-produced EPS as an attractive and perhaps, cost-effective biosorbent for heavy metal removal (to trace effluent concentrations) and recovery (86-99%).
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Affiliation(s)
- Victor Ajao
- Wetsus - European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911 MA, Leeuwarden, the Netherlands; Sub-department of Environmental Technology, Wageningen University and Research, Bornse Weilanden 9, 6708 WG, Wageningen, the Netherlands.
| | - Kang Nam
- School of Life Sciences and Environmental Technology, Avans University of Applied Science, Breda, the Netherlands
| | - Paraschos Chatzopoulos
- Wetsus - European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911 MA, Leeuwarden, the Netherlands
| | - Evan Spruijt
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Harry Bruning
- Sub-department of Environmental Technology, Wageningen University and Research, Bornse Weilanden 9, 6708 WG, Wageningen, the Netherlands
| | - Huub Rijnaarts
- Sub-department of Environmental Technology, Wageningen University and Research, Bornse Weilanden 9, 6708 WG, Wageningen, the Netherlands
| | - Hardy Temmink
- Wetsus - European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911 MA, Leeuwarden, the Netherlands; Sub-department of Environmental Technology, Wageningen University and Research, Bornse Weilanden 9, 6708 WG, Wageningen, the Netherlands
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Manjunathan P, Marakatti VS, Chandra P, Kulal AB, Umbarkar SB, Ravishankar R, Shanbhag GV. Mesoporous tin oxide: An efficient catalyst with versatile applications in acid and oxidation catalysis. Catal Today 2018. [DOI: 10.1016/j.cattod.2017.10.009] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Mohandas JC, Abou-Hamad E, Callens E, Samantaray MK, Gajan D, Gurinov A, Ma T, Ould-Chikh S, Hoffman AS, Gates BC, Basset JM. From single-site tantalum complexes to nanoparticles of Ta x N y and TaO x N y supported on silica: elucidation of synthesis chemistry by dynamic nuclear polarization surface enhanced NMR spectroscopy and X-ray absorption spectroscopy. Chem Sci 2017; 8:5650-5661. [PMID: 28989603 PMCID: PMC5621011 DOI: 10.1039/c7sc01365e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 06/08/2017] [Indexed: 11/30/2022] Open
Abstract
Air-stable catalysts consisting of tantalum nitride nanoparticles represented as a mixture of Ta x N y and TaO x N y with diameters in the range of 0.5 to 3 nm supported on highly dehydroxylated silica were synthesized from TaMe5 (Me = methyl) and dimeric Ta2(OMe)10 with guidance by the principles of surface organometallic chemistry (SOMC). Characterization of the supported precursors and the supported nanoparticles formed from them was carried out by IR, NMR, UV-Vis, extended X-ray absorption fine structure, and X-ray photoelectron spectroscopies complemented with XRD and high-resolution TEM, with dynamic nuclear polarization surface enhanced NMR spectroscopy being especially helpful by providing enhanced intensities of the signals of 1H, 13C, 29Si, and 15N at their natural abundances. The characterization data provide details of the synthesis chemistry, including evidence of (a) O2 insertion into Ta-CH3 species on the support and (b) a binuclear to mononuclear transformation of species formed from Ta2(OMe)10 on the support. A catalytic test reaction, cyclooctene epoxidation, was used to probe the supported nanoparticles, with 30% H2O2 serving as the oxidant. The catalysts gave selectivities up to 98% for the epoxide at conversions as high as 99% with a 3.4 wt% loading of Ta present as Ta x N y /TaO x N y .
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Affiliation(s)
- Janet C Mohandas
- King Abdullah University of Science & Technology , KAUST Catalysis Center (KCC) , 23955-6900 Thuwal , Saudi Arabia .
| | - Edy Abou-Hamad
- King Abdullah University of Science & Technology , KAUST Catalysis Center (KCC) , 23955-6900 Thuwal , Saudi Arabia .
| | - Emmanuel Callens
- King Abdullah University of Science & Technology , KAUST Catalysis Center (KCC) , 23955-6900 Thuwal , Saudi Arabia .
| | - Manoja K Samantaray
- King Abdullah University of Science & Technology , KAUST Catalysis Center (KCC) , 23955-6900 Thuwal , Saudi Arabia .
| | - David Gajan
- Institut de Sciences Analytiques (CNRS/ENS-Lyon/UCB-Lyon 1) , Université de Lyon , Centre de RMN à Très Hauts Champs , 69100 , Villeurbanne , France
| | - Andrei Gurinov
- King Abdullah University of Science & Technology , KAUST Catalysis Center (KCC) , 23955-6900 Thuwal , Saudi Arabia .
| | - Tao Ma
- Department of Chemical Engineering , University of California , Davis , California 95616 , USA .
| | - Samy Ould-Chikh
- King Abdullah University of Science & Technology , KAUST Catalysis Center (KCC) , 23955-6900 Thuwal , Saudi Arabia .
| | - Adam S Hoffman
- Department of Chemical Engineering , University of California , Davis , California 95616 , USA .
| | - Bruce C Gates
- Department of Chemical Engineering , University of California , Davis , California 95616 , USA .
| | - Jean-Marie Basset
- King Abdullah University of Science & Technology , KAUST Catalysis Center (KCC) , 23955-6900 Thuwal , Saudi Arabia .
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Macià Escatllar A, Ugliengo P, Bromley ST. Modeling hydroxylated nanosilica: Testing the performance of ReaxFF and FFSiOH force fields. J Chem Phys 2017; 146:224704. [DOI: 10.1063/1.4985083] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Affiliation(s)
- Antoni Macià Escatllar
- Departament de Ciència de Materials i Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, E-08028 Barcelona, Spain
| | - Piero Ugliengo
- Dipartimento di Chimica and NIS Centre, Università degli Studi di Torino, 10125 Torino, Italy
| | - Stefan T. Bromley
- Departament de Ciència de Materials i Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, E-08028 Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), E-08010 Barcelona, Spain
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Cuko A, Macià A, Calatayud M, Bromley ST. Global optimisation of hydroxylated silica clusters: A cascade Monte Carlo Basin Hopping approach. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2016.12.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Wang W, Daran JC, Poli R, Agustin D. OH-substituted tridentate ONO Schiff base ligands and related molybdenum(VI) complexes for solvent-free (ep)oxidation catalysis with TBHP as oxidant. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2016.02.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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