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Zhang J, Ding T, Zhang Z, Xu L, Zhang C. Enhanced Adsorption of Trivalent Arsenic from Water by Functionalized Diatom Silica Shells. PLoS One 2015; 10:e0123395. [PMID: 25837498 PMCID: PMC4383452 DOI: 10.1371/journal.pone.0123395] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Accepted: 02/18/2015] [Indexed: 11/23/2022] Open
Abstract
The potential of porous diatom silica shells as a naturally abundant low-cost sorbent for the removal of arsenic in aqueous solutions was investigated in a batch study. The objective of this work was to chemically modify the silica shells of a diatom Melosira sp. with bifunctional (thiol and amino) groups to effectively remove arsenic in its toxic As(III) form (arsenite) predominant in the aquatic environment. Sorption experiments with this novel sorbent were conducted under varying conditions of pH, time, dosage, and As(III) concentration. A maximum adsorption capacity of 10.99 mg g-1 was achieved within 26 h for a solution containing 12 mg L-1 As(III) at pH 4 and sorbent dosage of 2 g L-1. The functionalized diatom silica shells had a surface morphological change which was accompanied by increased pore size at the expense of reduced specific surface area and total pore volume. As(III) adsorption was best fitted with the Langmuir-Freundlich model, and the adsorption kinetic data using pore surface diffusion model showed that both the external (film) and internal (intraparticle) diffusion can be rate-determining for As(III) adsorption. Fourier transform infrared spectroscopy (FTIR) indicated that the thiol and amino groups potentially responsible for As(III) adsorption were grafted on the surface of diatom silica shells. X-ray photoelectron spectroscopy (XPS) further verified that this unique sorbent proceeded via a chemisorption mechanism through the exchange between oxygen-containing groups of neutral As(III) and thiol groups, and through the surface complexation between As(III) and protonated nitrogen and hydroxyl groups. Results indicate that this functionalized bioadsorbent with a high As(III) adsorption capacity holds promise for the treatment of As(III) containing wastewater.
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Affiliation(s)
- Jianying Zhang
- Environmental Science Institute, Zhejiang University, Hangzhou, Zhejiang, People’s Republic of China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang, People’s Republic of China
- * E-mail:
| | - Tengda Ding
- Environmental Science Institute, Zhejiang University, Hangzhou, Zhejiang, People’s Republic of China
- Institute of Science and Technology Strategy, Jiangxi Academy of Sciences, Nanchang, Jiangxi, People’s Republic of China
| | - Zhijian Zhang
- Environmental Science Institute, Zhejiang University, Hangzhou, Zhejiang, People’s Republic of China
| | - Liping Xu
- Environmental Science Institute, Zhejiang University, Hangzhou, Zhejiang, People’s Republic of China
| | - Chunlong Zhang
- Department of Environmental Sciences, University of Houston-Clear Lake, Houston, Texas, United States of America
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52
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Liu Q, Zheng Y, Zhong L, Cheng X. Removal of tetracycline from aqueous solution by a Fe3O4 incorporated PAN electrospun nanofiber mat. J Environ Sci (China) 2015; 28:29-36. [PMID: 25662235 DOI: 10.1016/j.jes.2014.04.016] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 04/18/2014] [Accepted: 04/21/2014] [Indexed: 05/22/2023]
Abstract
Pollution of antibiotics, a type of emerging contaminant, has become an issue of concern, due to their overuse in human and veterinary application, persistence in environment and great potential risk to human and animal health even at trace level. In this work, a novel adsorbent, Fe3O4 incorporated polyacrylonitrile nanofiber mat (Fe-NFM), was successfully fabricated via electrospinning and solvothermal method, targeting to remove tetracycline (TC), a typical class of antibiotics, from aqueous solution. Field emission scanning electron microscopy and X-ray diffraction spectroscopy were used to characterize the surface morphology and crystal structure of the Fe-NFM, and demonstrated that Fe-NFM was composed of continuous, randomly distributed uniform nanofibers with surface coating of Fe3O4 nanoparticles. A series of adsorption experiments were carried out to evaluate the removal efficiency of TC by the Fe-NFM. The pseudo-second-order kinetics model fitted better with the experimental data. The highest adsorption capacity was observed at initial solution pH4 while relative high adsorption performance was obtained from initial solution pH4 to 10. The adsorption of TC on Fe-NFM was a combination effect of both electrostatic interaction and complexation between TC and Fe-NFM. Freundlich isotherm model could better describe the adsorption isotherm. The maximum adsorption capacity calculated from Langmuir isotherm model was 315.31 mg/g. Compared to conventional nanoparticle adsorbents which have difficulties in downstream separation, the novel nanofiber mat can be simply installed as a modular compartment and easily separated from the aqueous medium, promising its huge potential in drinking and wastewater treatment for micro-pollutant removal.
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Affiliation(s)
- Qing Liu
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Yuming Zheng
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
| | - Lubin Zhong
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Xiaoxia Cheng
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; College of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
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53
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Ma Y, Liu WJ, Zhang N, Li YS, Jiang H, Sheng GP. Polyethylenimine modified biochar adsorbent for hexavalent chromium removal from the aqueous solution. BIORESOURCE TECHNOLOGY 2014; 169:403-408. [PMID: 25069094 DOI: 10.1016/j.biortech.2014.07.014] [Citation(s) in RCA: 203] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 07/02/2014] [Accepted: 07/03/2014] [Indexed: 05/20/2023]
Abstract
A chemical modified biochar with abundant amino groups for heavy metal removal was prepared using polyethylenimine (PEI) as a modification reagent, and used as an adsorbent for the removal of Cr(VI) from aqueous solution. The biochars before and after modification were characterized by Fourier transformed infrared spectroscopy, X-ray photoelectron spectroscopy etc. The adsorption of Cr(VI) by the modified biochar was obeyed pseudo-second-order kinetic model and Langmuir adsorption isotherm model. Its maximum adsorption capacity was 435.7 mg/g, which was much higher than that of pristine biochar (23.09 mg/g). Results also indicated that the removal of Cr(VI) by the PEI modified biochar depended on solution pH, and a low pH value was favorable for the Cr(VI) removal. The results herein revealed that the PEI modified biochar had a good potential as a suitable material for sorption and detoxification of Cr(VI) from aqueous solution.
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Affiliation(s)
- Ying Ma
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Wu-Jun Liu
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Nan Zhang
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Yu-Sheng Li
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Hong Jiang
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Guo-Ping Sheng
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
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54
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Balderas-Valadez RF, Agarwal V. Porous silicon functionalization for possible arsenic adsorption. NANOSCALE RESEARCH LETTERS 2014; 9:508. [PMID: 25249826 PMCID: PMC4171714 DOI: 10.1186/1556-276x-9-508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 08/22/2014] [Indexed: 06/03/2023]
Abstract
Thiol-functionalized porous silicon (PS) monolayer was evaluated for its possible application in As (III) adsorption. Dimercaptosuccinic acid (DMSA) attached to mesoporous silicon via amide bond linkages was used as a chelate for As (III). Two different aminosilanes namely 3-(aminopropyl) triethoxysilane (APTES) and 3-aminopropyl (diethoxy)-methylsilane (APDEMS) were tested as linkers to evaluate the relative response for DMSA attachment. The aminosilane-modified PS samples were attached to DMSA by wet impregnation followed by the adsorption of As (III). Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) have been used to identify the functional groups and to estimate the As (III) content, respectively. FTIR spectroscopy confirmed the covalent bonding of DMSA with amide and R-COOH groups on the nanostructured porous surface. XPS confirms the preferred arsenic adsorption on the surface of PS/DMSA samples as compared to the aminosilane-modified and bare PS substrates.
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Affiliation(s)
| | - Vivechana Agarwal
- CIICAp, UAEM, Av. Universidad 1001 Col. Chamilpa, Cuernavaca, Morelos CP 62210, Mexico
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55
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Simsek EB, Beker U. Equilibrium arsenic adsorption onto metallic oxides : Isotherm models, error analysis and removal mechanism. KOREAN J CHEM ENG 2014. [DOI: 10.1007/s11814-014-0176-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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56
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Zhang WB, Deng M, Sun CX, Wang SB. Ultrasound-Enhanced Adsorption of Chromium(VI) on Fe3O4 Magnetic Particles. Ind Eng Chem Res 2013. [DOI: 10.1021/ie401497k] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Wang-Bing Zhang
- Department of Applied Chemistry and ‡Analysis and Testing Central Facility, Anhui University of Technology, Maanshan, Anhui 243002, P. R. China
| | - Miao Deng
- Department of Applied Chemistry and ‡Analysis and Testing Central Facility, Anhui University of Technology, Maanshan, Anhui 243002, P. R. China
| | - Chu-Xiao Sun
- Department of Applied Chemistry and ‡Analysis and Testing Central Facility, Anhui University of Technology, Maanshan, Anhui 243002, P. R. China
| | - Shang-Bing Wang
- Department of Applied Chemistry and ‡Analysis and Testing Central Facility, Anhui University of Technology, Maanshan, Anhui 243002, P. R. China
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57
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Wang T, Zhang L, Wang H, Yang W, Fu Y, Zhou W, Yu W, Xiang K, Su Z, Dai S, Chai L. Controllable synthesis of hierarchical porous Fe3O4 particles mediated by poly(diallyldimethylammonium chloride) and their application in arsenic removal. ACS APPLIED MATERIALS & INTERFACES 2013; 5:12449-59. [PMID: 24251780 DOI: 10.1021/am403533v] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Hierarchical porous Fe3O4 particles with tunable grain size were synthesized based on a facile poly (diallyldimethylammonium chloride) (PDDA)-modulated solvothermal method. The products were characterized with scanning electron microscopy (SEM) and transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), N2 adsorption-desorption technique, vibrating sample magnetometer (VSM), and dynamic light scattering (DLS). The results show that increasing the PDDA dosage decrease the grain size and particle size, which increased the particle porosity and enhanced the surface area from 7.05 to 32.75 m(2) g(-1). Possible mechanism can be ascribed to the PDDA function on capping the crystal surface and promoting the viscosity of reaction medium to mediate the growth and assembly of grain. Furthermore, the arsenic adsorption application of the as-obtained Fe3O4 samples was investigated and the adsorption mechanism was proposed. High magnetic Fe3O4 particles with increased surface area display improved arsenic adsorption performance, superior efficiency in low-level arsenic removal, high desorption efficiency, and satisfactory magnetic recyclability, which are very promising compared with commercial Fe3O4 particles.
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Affiliation(s)
- Ting Wang
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University , Changsha 410017, P. R. China
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58
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Shen H, Chen J, Dai H, Wang L, Hu M, Xia Q. New Insights into the Sorption and Detoxification of Chromium(VI) by Tetraethylenepentamine Functionalized Nanosized Magnetic Polymer Adsorbents: Mechanism and pH Effect. Ind Eng Chem Res 2013. [DOI: 10.1021/ie4010805] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Haoyu Shen
- Ningbo Institute
of Technology, Zhejiang University, Ningbo, Zhejiang 315100, China
| | - Junliang Chen
- Ningbo Institute
of Technology, Zhejiang University, Ningbo, Zhejiang 315100, China
| | - Huofeng Dai
- Ningbo Institute
of Technology, Zhejiang University, Ningbo, Zhejiang 315100, China
| | - Lubo Wang
- Ningbo Institute
of Technology, Zhejiang University, Ningbo, Zhejiang 315100, China
| | - Meiqin Hu
- Ningbo Institute
of Technology, Zhejiang University, Ningbo, Zhejiang 315100, China
| | - Qinghua Xia
- Ministry-of-Education
Key Laboratory for the Synthesis and Applications of Organic Functional
Molecules, Hubei Collaborative Innovation Center for Advanced Organochemical
Materials, Hubei University, Wuhan, Hubei 430062, China
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59
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Mohd A, Ab Karim Ghani WAW, Resitanim NZ, Sanyang L. A Review: Carbon Dioxide Capture: Biomass-Derived-Biochar and Its Applications. J DISPER SCI TECHNOL 2013. [DOI: 10.1080/01932691.2012.704753] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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60
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Tang W, Su Y, Li Q, Gao S, Shang JK. Superparamagnetic magnesium ferrite nanoadsorbent for effective arsenic (III, V) removal and easy magnetic separation. WATER RESEARCH 2013; 47:3624-34. [PMID: 23726698 DOI: 10.1016/j.watres.2013.04.023] [Citation(s) in RCA: 101] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 04/14/2013] [Accepted: 04/15/2013] [Indexed: 05/12/2023]
Abstract
By doping a proper amount of Mg(2+) (~10%) into α-Fe2O3 during a solvent thermal process, ultrafine magnesium ferrite (Mg0.27Fe2.50O4) nanocrystallites were successfully synthesized with the assistance of in situ self-formed NaCl "cage" to confine their crystal growth. Their ultrafine size (average size of ~3.7 nm) and relatively low Mg-content conferred on them a superparamagnetic behavior with a high saturation magnetization (32.9 emu/g). The ultrafine Mg0.27Fe2.50O4 nanoadsorbent had a high specific surface area of ~438.2 m(2)/g, and demonstrated a superior arsenic removal performance on both As(III) and As(V) at near neutral pH condition. Its adsorption capacities on As(III) and As(V) were found to be no less than 127.4 mg/g and 83.2 mg/g, respectively. Its arsenic adsorption mechanism was found to follow the inner-sphere complex mechanism, and abundant hydroxyl groups on its surface played the major role in its superior arsenic adsorption performance. It could be easily separated from treated water bodies with magnetic separation, and could be easily regenerated and reused while maintaining a high arsenic removal efficiency. This novel superparamagnetic magnesium ferrite nanoadsorbent may offer a simple single step adsorption treatment option to remove arsenic contamination from water without the pre-/post-treatment requirement for current industrial practice.
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Affiliation(s)
- Wenshu Tang
- Environment Functional Materials Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, Liaoning Province, PR China
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61
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Simultaneous removal of arsenate and arsenite by a nanostructured zirconium–manganese binary hydrous oxide: Behavior and mechanism. J Colloid Interface Sci 2013; 397:137-43. [DOI: 10.1016/j.jcis.2012.11.056] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2012] [Revised: 11/18/2012] [Accepted: 11/23/2012] [Indexed: 11/19/2022]
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62
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Yang T, Liu JW, Gu C, Chen ML, Wang JH. Expression of arsenic regulatory protein in Escherichia coli for selective accumulation of methylated arsenic species. ACS APPLIED MATERIALS & INTERFACES 2013; 5:2767-2772. [PMID: 23484908 DOI: 10.1021/am400578y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
ArsR is a metalloregulatory protein with high selectivity and affinity toward arsenic. We hereby report the expression of ArsR in Escherichia coli by cell engineering, which significantly enhances the adsorption/accumulation capacity of methylated arsenic species. The ArsR-expressed E. coli cells (denoted as E. coli-ArsR) give rise to 5.6-fold and 3.4-fold improvements on the adsorption/accumulation capacity for monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA), with respect to native E. coli cells. The uptake of MMA and DMA by the E. coli-ArsR is a fast process fitting Langmuir adsorption model. It is interesting to note that the accumulation of methylated arsenic is virtually not affected by the presence of competing heavy-metal species, at least 10 times of Cd(II) and Pb(II) are tolerated for the adsorption of 1 mg L(-1) methylated arsenic. In addition, an ionic strength of up to 2 g L(-1) Na+ poses no obvious effect on the sorption of 1 mg L(-1) MMA and DMA. Furthermore, the accumulation of MMA and DMA is less sensitive to the variation of pH value, with respect to the blank control cells. Consequently, 82.4% of MMA and 96.3% of DMA at a concentration of 50 μg L(-1) could be readily removed from aqueous medium by 12 g L(-1) of E. coli-ArsR . This illustrates a great potential for the E. coli-ArsR for selective remediation of methylated arsenic species in waters, even in the presence of a high concentration of salts.
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Affiliation(s)
- Ting Yang
- Research Center for Analytical Sciences, College of Sciences, Box 332, Northeastern University, Shenyang 110819, People's Republic of China
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63
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Warner CL, Chouyyok W, Mackie KE, Neiner D, Saraf LV, Droubay TC, Warner MG, Addleman RS. Manganese doping of magnetic iron oxide nanoparticles: tailoring surface reactivity for a regenerable heavy metal sorbent. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:3931-3937. [PMID: 22329500 DOI: 10.1021/la2042235] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A method for tuning the analyte affinity of magnetic, inorganic nanostructured sorbents for heavy metal contaminants is described. The manganese-doped iron oxide nanoparticle sorbents have a remarkably high affinity compared to the precursor material. Sorbent affinity can be tuned toward an analyte of interest simply by adjustment of the dopant quantity. The results show that following the Mn doping process there is a large increase in affinity and capacity for heavy metals (i.e., Co, Ni, Zn, As, Ag, Cd, Hg, and Tl). Capacity measurements were carried out for the removal of cadmium from river water and showed significantly higher loading than the relevant commercial sorbents tested for comparison. The reduction in Cd concentration from 100 ppb spiked river water to 1 ppb (less than the EPA drinking water limit of 5 ppb for Cd) was achieved following treatment with the Mn-doped iron oxide nanoparticles. The Mn-doped iron oxide nanoparticles were able to load ~1 ppm of Cd followed by complete stripping and recovery of the Cd with a mild acid wash. The Cd loading and stripping is shown to be consistent through multiple cycles with no loss of sorbent performance.
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Affiliation(s)
- Cynthia L Warner
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
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64
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Removal of methylated arsenic using a nanostructured zirconia-based sorbent: Process performance and adsorption chemistry. J Colloid Interface Sci 2012; 367:362-9. [DOI: 10.1016/j.jcis.2011.10.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Revised: 09/27/2011] [Accepted: 10/03/2011] [Indexed: 11/23/2022]
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65
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Tian Y, Wu M, Lin X, Huang P, Huang Y. Synthesis of magnetic wheat straw for arsenic adsorption. JOURNAL OF HAZARDOUS MATERIALS 2011; 193:10-6. [PMID: 21862216 DOI: 10.1016/j.jhazmat.2011.04.093] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Revised: 03/23/2011] [Accepted: 04/23/2011] [Indexed: 05/12/2023]
Abstract
Magnetic wheat straw (MWS) with different Fe(3)O(4) content was synthesized by using in-situ co-precipitation method. It was characterized by powder X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). This material can be used for arsenic adsorption from water, and can be easily separated by applied magnetic field. The introduction of wheat straw template highly enhanced the arsenic adsorption of Fe(3)O(4). Among three adsorption isotherm models examined, the data fitted Langmuir model better. Fe(3)O(4) content and initial pH value influenced its adsorption behavior. Higher Fe(3)O(4) content corresponded to a higher adsorption capacity. In the pH range of 3-11, As(V) adsorption was decreased with increasing of pH; As(III) adsorption had the highest capacity at pH 7-9. Moreover, by using 0.1 mol L(-1) NaOH aqueous solution, it could be regenerated. This work provided an efficient way for making use of agricultural waste.
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Affiliation(s)
- Ye Tian
- State Engineering Research Center of Engineering Plastics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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66
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Zheng YM, Zou SW, Nanayakkara KN, Matsuura T, Chen JP. Adsorptive removal of arsenic from aqueous solution by a PVDF/zirconia blend flat sheet membrane. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2011.02.034] [Citation(s) in RCA: 133] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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67
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Zheng YM, Liu T, Jiang J, Yang L, Fan Y, Wee ATS, Chen JP. Characterization of hexavalent chromium interaction with Sargassum by X-ray absorption fine structure spectroscopy, X-ray photoelectron spectroscopy, and quantum chemistry calculation. J Colloid Interface Sci 2011; 356:741-8. [PMID: 21310422 DOI: 10.1016/j.jcis.2010.12.070] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2010] [Revised: 12/17/2010] [Accepted: 12/18/2010] [Indexed: 11/30/2022]
Abstract
Hexavalent chromium represents higher toxicity in aqueous solutions. It can be removed by such low-cost biosorbents as Sargassum sp. In this study, X-ray absorption fine structure spectroscopy, X-ray photoelectron spectroscopy, and quantum chemistry (QC) calculation were used to study the interactions between hexavalent chromium and Sargassum sp. during the biosorption. It was found that most of the adsorbed Cr(VI) ions were reduced to Cr(III) after the biosorption. The electrons for the reduction of Cr(VI) were possibly supplied from the Sargassum biomass, some organic compounds of which were oxidized. Cr(III) ions were coordinated with the oxygen atoms from either carboxyl or hydroxyl functional groups to form an octahedral structural metal complex. The coordination numbers of the formed Cr complex were 4-6, and bond length of Cr-O was 1.98Å. QC calculation proved the possible formation of the Cr(III) metal complex, and revealed that carboxyl from biomass could be strongly bound with Cr(III). A three-step removal mechanism of Cr(VI) by Sargassum was proposed.
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Affiliation(s)
- Yu-Ming Zheng
- Department of Civil and Environmental Engineering, National University of Singapore, Singapore, Singapore
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68
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Deng S, Liu H, Zhou W, Huang J, Yu G. Mn-Ce oxide as a high-capacity adsorbent for fluoride removal from water. JOURNAL OF HAZARDOUS MATERIALS 2011; 186:1360-6. [PMID: 21208743 DOI: 10.1016/j.jhazmat.2010.12.024] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 12/03/2010] [Accepted: 12/06/2010] [Indexed: 05/05/2023]
Abstract
A novel Mn-Ce oxide adsorbent with high sorption capacity for fluoride was prepared via co-precipitation method in this study, and the granular adsorbent was successfully prepared by calcining the mixture of the Mn-Ce powder and pseudo-boehmite. High-resolution transmission electron microscopy (TEM) image showed that the Mn-Ce adsorbent consisted of about 4.5 nm crystals, and X-ray diffraction (XRD) analysis indicated the formation of solid solution by Mn species entering CeO(2) lattices. The surface hydroxyl group density on the Mn-Ce adsorbent was determined to be as high as 15.3 mmol g(-1), mainly responsible for its high sorption capacity for fluoride. Sorption isotherms showed that the sorption capacities of fluoride on the powdered and granular adsorbent were 79.5 and 45.5 mg g(-1) respectively at the equilibrium fluoride concentration of 1 mg L(-1), much higher than all reported adsorbents. Additionally, the adsorption was fast within the initial 1 h. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis revealed that the hydroxyl groups on the adsorbent surface were involved in the sorption of fluoride. Both anion exchange and electrostatic interaction were involved in the sorption of fluoride on the Mn-Ce oxide adsorbent.
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Affiliation(s)
- Shubo Deng
- Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
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69
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Ma Y, Zheng YM, Chen JP. A zirconium based nanoparticle for significantly enhanced adsorption of arsenate: Synthesis, characterization and performance. J Colloid Interface Sci 2011; 354:785-92. [DOI: 10.1016/j.jcis.2010.10.041] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2010] [Revised: 10/15/2010] [Accepted: 10/19/2010] [Indexed: 10/18/2022]
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70
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Chen B, Chen Z, Lv S. A novel magnetic biochar efficiently sorbs organic pollutants and phosphate. BIORESOURCE TECHNOLOGY 2011; 102:716-23. [PMID: 20863698 DOI: 10.1016/j.biortech.2010.08.067] [Citation(s) in RCA: 415] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2010] [Revised: 08/19/2010] [Accepted: 08/22/2010] [Indexed: 05/12/2023]
Abstract
Biochar derived from agricultural biomass waste is increasingly recognized as a multifunctional material for agricultural and environmental applications. Three novel magnetic biochars (MOP250, MOP400, MOP700) were prepared by chemical co-precipitation of Fe3+/Fe2+ on orange peel powder and subsequently pyrolyzing under different temperatures (250, 400 and 700 °C), which resulted in iron oxide magnetite formation and biochar preparation in one-step. The MOP400 was comprised of nano-size magnetite particles and amorphous biochar, and thus exhibited hybrid sorption capability to efficiently remove organic pollutants and phosphate from water. For organic pollutants, MOP400 demonstrated the highest sorption capability, and even much larger than the companion non-magnetic biochar (OP400). For phosphate, magnetic biochars, especially MOP250, demonstrated much higher sorption capability than the companion non-magnetic biochars. No significantly competitive effect between organic pollutant and phosphate was observed. These suggest that the magnetic biochar is a potential sorbent to remove organic contaminants and phosphate simultaneously from wastewater.
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Affiliation(s)
- Baoliang Chen
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310028, China.
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Liu J, Du X. Fast removal of aqueous Hg(ii) with quaternary ammonium-functionalized magnetic mesoporous silica and silica regeneration. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10111k] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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72
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A novel strategy to prepare ZnO/PbS heterostructured functional nanocomposite utilizing the surface adsorption property of ZnO nanosheets. Catal Today 2010. [DOI: 10.1016/j.cattod.2010.07.013] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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73
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Chowdhury SR, Yanful EK. Arsenic and chromium removal by mixed magnetite-maghemite nanoparticles and the effect of phosphate on removal. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2010; 91:2238-47. [PMID: 20598797 DOI: 10.1016/j.jenvman.2010.06.003] [Citation(s) in RCA: 182] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Revised: 05/10/2010] [Accepted: 06/02/2010] [Indexed: 05/21/2023]
Abstract
Adsorption of arsenic and chromium by mixed magnetite and maghemite nanoparticles from aqueous solution is a promising technology. In the present batch experimental study, a commercially grade nano-size 'magnetite', later identified in laboratory characterization to be mixed magnetite-maghemite nanoparticles, was used in the uptake of arsenic and chromium from different water samples. The intent was to identify or develop a practical method for future groundwater remediation. The results of the study showed 96-99% arsenic and chromium uptake under controlled pH conditions. The maximum arsenic adsorption occurred at pH 2 with values of 3.69 mg/g for arsenic(III) and 3.71 mg/g for arsenic(V) when the initial concentration was kept at 1.5 mg/L for both arsenic species, while chromium(VI) concentration was 2.4 mg/g at pH 2 with an initial chromium(VI) concentration of 1 mg/L. Thus magnetite-maghemite nanoparticles can readily adsorb arsenic and chromium in an acidic pH range. Redox potential and pH data helped to infer possible dominating species and oxidation states of arsenic and chromium in solution. The results also showed the limitation of arsenic and chromium uptake by the nano-size magnetite-maghemite mixture in the presence of a competing anion such as phosphate. At a fixed adsorbent concentration of 0.4 g/L, arsenic and chromium uptake decreased with increasing phosphate concentration. Nano-size magnetite-maghemite mixed particles adsorbed less than 50% arsenic from synthetic water containing more than 3 mg/L phosphate and 1.2 mg/L of initial arsenic concentration, and less than 50% chromium from synthetic water containing more than 5 mg/L phosphate and 1.0 mg/L of chromium(VI). In natural groundwater containing more than 5 mg/L phosphate and 1.13 mg/L of arsenic, less than 60% arsenic uptake was achieved. In this case, it is anticipated that an optimum design with magnetite-maghemite nanoparticles may achieve high arsenic uptake in field applications.
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Affiliation(s)
- Saidur Rahman Chowdhury
- Department of Civil and Environmental Engineering, University of Western Ontario, London, ON N6A 5B9, Canada.
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Adamescu A, Mitchell W, Hamilton IP, Al-Abadleh HA. Insights into the surface complexation of dimethylarsinic acid on iron (oxyhydr)oxides from ATR-FTIR studies and quantum chemical calculations. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:7802-7807. [PMID: 20857976 DOI: 10.1021/es1011516] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The surface chemistry of methylated arsenicals with ubiquitous geosorbents and industrial catalysts is poorly understood. These arsenic compounds pose both a health and an environmental risk in addition to being a challenge to the energy industry. We report herein a detailed spectroscopic analysis of the surface structure of dimethylarsinic acid (DMA) adsorbed on hematite and goethite using attenuated total internal reflectance Fourier transform infrared spectroscopy (ATR-FTIR). Spectra of adsorbed DMA, DMA(ads), were collected in situ as a function of pH and ionic strength, using both H(2)O and D(2)O at 298 K in flow mode. Experimental data were complemented with DFT calculations of geometries and frequencies of hydrated DMA-iron oxide clusters. Results indicate the simultaneous formation of inner- and outer-sphere complexes with distinct spectral components. Desorption behavior of DMA due to chloride and phosphate was studied as a function of time from the decrease in the absorbance of apparent spectral features. The impact of our studies on the environmental fate of DMA in geochemical environments and the design of technologies to reduce arsenic content in fuels are discussed.
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Affiliation(s)
- Adrian Adamescu
- Chemistry Department, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada
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75
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Sun XF, Ma Y, Liu XW, Wang SG, Gao BY, Li XM. Sorption and detoxification of chromium(VI) by aerobic granules functionalized with polyethylenimine. WATER RESEARCH 2010; 44:2517-2524. [PMID: 20181374 DOI: 10.1016/j.watres.2010.01.027] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2009] [Revised: 12/23/2009] [Accepted: 01/25/2010] [Indexed: 05/26/2023]
Abstract
This study describes the modification of aerobic granules by grafting polyethylenimine (PEI) for simultaneous sorption and detoxification of Cr(VI). After modification, the uptake capacity of modified aerobic granules (MAG) showed about 401.5 mg/g at pH 5.5 and increased by 274% compared to the control. Adsorption experiments were carried out as a function of contact time, pH and concentration of Cr(VI). It was found that the equilibrium sorption can be attained within 3 h and the process obeys the Redlich-Peterson isotherm model. The adsorption process is a function of pH of the solution, with the greater adsorption at pH 5.2. The interaction characteristics between the Cr and MAG were elucidated by applying FTIR and XPS analyses. FTIR results showed that the -NH2 groups in the sorbent are involved in the adsorption process. XPS results verified the presence of Cr(III) on the MAG surface in the pH range 1.5-8.5, suggesting that some Cr(VI) anions were reduced to Cr(III) during the sorption.
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Affiliation(s)
- Xue-Fei Sun
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
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Preparation and characterization of zirconium-based magnetic sorbent for arsenate removal. J Colloid Interface Sci 2009; 338:22-9. [DOI: 10.1016/j.jcis.2009.06.021] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Accepted: 06/10/2009] [Indexed: 11/16/2022]
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