101
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Adsorption of fluoride from aqueous solution by graphene. J Colloid Interface Sci 2011; 363:348-54. [PMID: 21821258 DOI: 10.1016/j.jcis.2011.07.032] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2011] [Revised: 07/01/2011] [Accepted: 07/09/2011] [Indexed: 11/24/2022]
Abstract
A batch adsorption system was applied to investigate the adsorption of fluoride from aqueous solution by graphene. The adsorption capacities and rates of fluoride onto graphene at different initial pH, contact time, and temperature were evaluated. The experimental results showed that graphene is an excellent fluoride adsorbent with an adsorption capacity of up to 17.65 mg/g at initial fluoride concentration of 25 mg/L and temperature of 298 K. The isotherm analysis indicated that the adsorption data can be well described by Langmuir isotherm model. Thermodynamic studies revealed that the adsorption reaction was a spontaneous and endothermic process.
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102
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Li YH, Du Q, Peng X, Wang D, Wang Z, Xia Y, Wei B. Physico-chemical characteristics and lead biosorption properties of Enteromorpha prolifera. Colloids Surf B Biointerfaces 2011; 85:316-22. [DOI: 10.1016/j.colsurfb.2011.03.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Revised: 03/02/2011] [Accepted: 03/02/2011] [Indexed: 10/18/2022]
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103
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Vílchez R, Gómez-Silván C, Purswani J, González-López J, Rodelas B. Characterization of bacterial communities exposed to Cr(III) and Pb(II) in submerged fixed-bed biofilms for groundwater treatment. ECOTOXICOLOGY (LONDON, ENGLAND) 2011; 20:779-92. [PMID: 21400090 DOI: 10.1007/s10646-011-0629-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/26/2011] [Indexed: 05/13/2023]
Abstract
Two pilot-scale submerged-bed microbial biofilms were set up for the removal of Cr(III) and Pb(II) from groundwater, and the biological activities and structure of the bacterial communities developed in the presence of the heavy metals were analyzed. Artesian groundwater was polluted with Cr(III) or Pb(II) (15 mg/l) and amended with sucrose (250 mg/l) as carbon source. While Pb(II) was over 99% removed from groundwater during long-term operation (130 days), the efficiency of the removal of Cr(III) significantly decreased in time (95-73% after 60 days). Cr(III)-amended biofilms displayed significant lower sucrose consumption, ATP cell contents and alkaline phosphatase activity, compared to biofilms formed in the presence of Pb(II), while analysis of exopolymers demonstrated significant differences in their composition (content of carbohydrates and acetyl groups) in response to each heavy metal. According to transmission electron microscopy (TEM) and electron-dispersive X-ray analysis (EDX), Cr(III) bioaccumulated in the exopolymeric matrix without entering bacterial cells, while Pb(II) was detected both extra and intracellularly, associated to P and Si. Temperature-gradient gel electrophoresis (TGGE) profiling based on partial amplification of 16S rRNA genes was used to analyze the differences in the structure of the biofilm bacterial communities developed under exposure to each heavy metal. Prevalent populations in the biofilms were further identified by reamplification and sequencing of isolated TGGE bands. 75% of the sequences in the Pb(II) biofilter were evolutively close to the Rhodobacterales, while in the Cr(III) biofilter 43% of the sequences were found affiliated to the Rhizobiales and Sphingomonadales, and 57% to Betaproteobacteria.
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Affiliation(s)
- R Vílchez
- Grupo de Microbiología Ambiental (Environmental Microbiology Research Group), Instituto del Agua y Departamento de Microbiología, Facultad de Farmacia, Universidad de Granada, 18071, Granada, Spain
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104
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Bulgariu L, Bulgariu D, Macoveanu M. Adsorptive Performances of Alkaline Treated Peat for Heavy Metal Removal. SEP SCI TECHNOL 2011. [DOI: 10.1080/01496395.2010.536192] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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105
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Pagana A, Sklari S, Kikkinides E, Zaspalis V. Combined adsorption–permeation membrane process for the removal of chromium (III) ions from contaminated water. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2010.11.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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106
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Li Y, Du Q, Wang X, Zhang P, Wang D, Wang Z, Xia Y. Removal of lead from aqueous solution by activated carbon prepared from Enteromorpha prolifera by zinc chloride activation. JOURNAL OF HAZARDOUS MATERIALS 2010; 183:583-9. [PMID: 20709449 DOI: 10.1016/j.jhazmat.2010.07.063] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2010] [Revised: 07/12/2010] [Accepted: 07/12/2010] [Indexed: 05/07/2023]
Abstract
Activated carbon was prepared from Enteromorpha prolifera (EP) by zinc chloride activation. The physico-chemical properties of EP-activated carbon (EPAC) were characterized by thermal stability, zeta potential and Boehm titration methods. The examination showed that EPAC has a porous structure with a high surface area of 1688 m(2)/g. Batch adsorption experiments were carried out to study the effect of various parameters such as initial pH, adsorbent dosage, contact time and temperature on Pb(II) ions adsorption properties by EPAC. The kinetic studies showed that the adsorption data followed a pseudo second-order kinetic model. The isotherm analysis indicated that the adsorption data can be represented by Freundlich isotherm model. Thermodynamic studies indicated that the adsorption reaction was a spontaneous and endothermic process.
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Affiliation(s)
- Yanhui Li
- Laboratory of Fiber Materials and Modern Textile, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
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107
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Ibrahim MNM, Ngah WSW, Norliyana MS, Daud WRW, Rafatullah M, Sulaiman O, Hashim R. A novel agricultural waste adsorbent for the removal of lead (II) ions from aqueous solutions. JOURNAL OF HAZARDOUS MATERIALS 2010; 182:377-385. [PMID: 20619537 DOI: 10.1016/j.jhazmat.2010.06.044] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Revised: 06/09/2010] [Accepted: 06/11/2010] [Indexed: 05/29/2023]
Abstract
The present study explores the ability of modified soda lignin (MSL) extracted from oil palm empty fruit bunches (EFB) in removing lead (II) ions from aqueous solutions. The effect of contact time, point zero charge (pH(pzc)) and pH of the solution, initial metal ion concentration and adsorbent dosage on the removal process were investigated. Furthermore, the MSL is characterized by SEM, XRF, FT-IR and surface area analysis. Equilibrium adsorption isotherms and kinetics were investigated. The experimental data were analyzed by the Langmuir, Freundlich and Temkin models of adsorption. The kinetic data obtained at different initial concentrations were analyzed using pseudo-first-order and pseudo-second-order models. The results provide strong evidence to support the hypothesis of adsorption mechanism.
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Affiliation(s)
- M N Mohamad Ibrahim
- School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
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108
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Mahmoud ME, Hafez OF, Osman MM, Elmelegy E. Implementation of Hybrid Inorganic/Organic Adsorbents for Removal and Preconcentration of Heavy Metals from Industrial Waste and Drinking Waters. SEP SCI TECHNOL 2010. [DOI: 10.1080/01496391003688910] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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109
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Mohamad Ibrahim MN, Ahmed-Haras MR, Sipaut CS, Aboul-Enein HY, Mohamed AA. Preparation and characterization of a newly water soluble lignin graft copolymer from oil palm lignocellulosic waste. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2010.01.030] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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110
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Moreno-Castilla C, Álvarez-Merino M, Pastrana-Martínez L, López-Ramón M. Adsorption mechanisms of metal cations from water on an oxidized carbon surface. J Colloid Interface Sci 2010; 345:461-6. [DOI: 10.1016/j.jcis.2010.01.062] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Revised: 01/19/2010] [Accepted: 01/22/2010] [Indexed: 11/16/2022]
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111
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112
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Bulgariu L, Bulgariu D, Malutan T, Macoveanu M. Adsorption of Lead(II) Ions from Aqueous Solution onto Lignin. ADSORPT SCI TECHNOL 2009. [DOI: 10.1260/026361709790252623] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
The adsorption of lead(II) ions from aqueous solution onto lignin was investigated in this study. Thus, the influence of the initial solution pH, the lignin dosage, the initial Pb(II) ion concentration and the contact time were investigated at room temperature (19 ± 0.5 °C) in a batch system. Adsorption equilibrium was approached within 30 min. The adsorption kinetic data could be well described by the pseudo-second-order kinetic model, while the equilibrium data were well fitted using the Langmuir isotherm model. A maximum adsorption capacity of 32.36 mg/g was observed. The results of this study indicate that lignin has the potential to become an effective and economical adsorbent for the removal of Pb(II) ions from industrial wastewaters.
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Affiliation(s)
- Laura Bulgariu
- Department of Environmental Engineering and Management, Faculty of Chemical Engineering and Environmental Protection, Technical University “Gheorghe Asachi” of Iaşi, D. Mangeron 71A, 700050 Iaşi, Romania
| | - Dumitru Bulgariu
- Department of Geology-Geochemistry, Faculty of Geography and Geology, “Al. I. Cuza” University, Carol I 20A, 700506 Iaşi, Romania
- Romanian Academy, Filial of Iaşi, Collective of Geography, Carol I 18A, 700506 Iaşi, Romania
| | - Theodor Malutan
- Department of Environmental Engineering and Management, Faculty of Chemical Engineering and Environmental Protection, Technical University “Gheorghe Asachi” of Iaşi, D. Mangeron 71A, 700050 Iaşi, Romania
| | - Matei Macoveanu
- Department of Environmental Engineering and Management, Faculty of Chemical Engineering and Environmental Protection, Technical University “Gheorghe Asachi” of Iaşi, D. Mangeron 71A, 700050 Iaşi, Romania
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113
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Malamis S, Katsou E, Chazilias D, Loizidou M. Investigation of Cr(III) removal from wastewater with the use of MBR combined with low-cost additives. J Memb Sci 2009. [DOI: 10.1016/j.memsci.2009.01.028] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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114
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Li J, Lin Q, Zhang X, Yan Y. Kinetic parameters and mechanisms of the batch biosorption of Cr(VI) and Cr(III) onto Leersia hexandra Swartz biomass. J Colloid Interface Sci 2009; 333:71-7. [DOI: 10.1016/j.jcis.2009.02.021] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2008] [Revised: 01/01/2009] [Accepted: 02/08/2009] [Indexed: 10/21/2022]
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115
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Removal of Cr(III) and Cr(VI) from aqueous solution by adsorption on sugarcane pulp residue. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s11771-009-0017-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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116
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Li JM, Meng XG, Hu CW, Du J. Adsorption of phenol, p-chlorophenol and p-nitrophenol onto functional chitosan. BIORESOURCE TECHNOLOGY 2009; 100:1168-73. [PMID: 18930394 DOI: 10.1016/j.biortech.2008.09.015] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2008] [Revised: 09/02/2008] [Accepted: 09/04/2008] [Indexed: 05/09/2023]
Abstract
Functional chitosan, chemically modified by salicylaldehyde (CS-SA), beta-cyclodextrin (CS-CD), and a cross-linked beta-cyclodextrin polymer (EPI-CD) were prepared as adsorbents to remove phenol, p-nitrophenol and p-chlorophenol from aqueous solution. Langmuir and Freundlich models were applied to describe the adsorption isotherm of phenols, and adsorption parameters were evaluated. Functional chitosan displayed outstanding adsorption ability for phenols. To our surprise, CS-CD exhibited specific adsorption ability for p-chlorophenol. The possible adsorption interaction was discussed. Effects of pH and KCl on the adsorption suggested that the adsorption of phenols was predominated by hydrogen bonding, hydrophobic interaction and pi-pi interaction not electrostatic interaction. Effect of temperature indicated that the low temperature was favorable for the adsorption of phenols. Separation of phenols and adsorbent regeneration were carried out by simple washing with ethanol and filtrating.
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Affiliation(s)
- Jian-Mei Li
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, PR China
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