Adsorption of 2,4-D on Mg/Al–NO3 layered double hydroxides with varying layer charge density

Chao, Yia-Feng; Chen, Pin-Chieh; Wang, Shan‐Li

doi:10.1016/j.clay.2007.09.003

Cited by 81 publications

(33 citation statements)

References 27 publications

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“…Although previous studies have revealed the promising performance of LDHs in removing anionic contaminants from water under laboratory conditions [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], some uncertainties exist with respect to the removal efficiency of LDHs in real-world conditions. Industrial wastewater and polluted surface water and groundwater usually have a chemical composition much more complex than those used in laboratory studies.…”

Section: Introductionmentioning

confidence: 94%

“…Previous studies showed that when Mg/Al-NO 3 LDHs have a higher layer charge density (i.e., Al 3+ /(Mg 2+ + Al 3+ ) molar ratio) and a larger basal spacing, the interlayer nitrate in LDHs is exchanged more easily by 2,4-D, arsenate, benzoate, chromate, silicate, teraborate, and terephthalate [5,10,14,18,23]. The increasing d-spacing of Mg/Al-NO 3 LDHs upon increasing layer charge density is correlated to the change in the orientation of interlayer nitrate with respect to the hydroxide layers of LDHs [24].…”

Section: Introductionmentioning

confidence: 98%

“…Therefore, LDHs have the unique property of being positively charged, which may be applied to complement the deficiency of anion adsorbents in the environment, and make them useful as barriers for the migration of anionic contaminants in groundwater or scavenging hazardous anions in drinking water and industrial wastewater. Previous studies have demonstrated the reactivity of LDHs toward several contaminants, such as 2,4-D [5][6][7][8], benzoate [9,10], phosphate [11,12], arsenate [13,14], arsenite [15], chromate [16][17][18] and selenate [19], in water.…”

Section: Introductionmentioning

confidence: 99%

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Preferential adsorption of 2,4-dichlorophenoxyacetate from associated binary-solute aqueous systems by Mg/Al-NO3 layered double hydroxides with different nitrate orientations

Chao

Lee

Wang

2009

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preferential adsorption of 2,4-dichlorophenoxyacetate from associated binary-solute aqueous systems by Mg/Al-NO3 layered double hydroxides with different nitrate orientations

Chao

Lee

Wang

2009

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

“…2,4-dichlorophenoxyacetic acid (2,4-D) is one of the phenoxyacetic acid herbicides, which is widely applied for control of broadleaf weeds in grain croplands, forests, domestic lawns, commercial turfs, and aquacultures [3,4]. This herbicide exists in anionic form in aqueous solutions due to its low pK a (i.e., 2.73) [4]. Such anionic herbicides are particular concerns because they are very weakly retained by most soils and hence, can rapidly move in the soil solution, leading to the contamination of surface and ground waters [1,2].…”

Section: Introductionmentioning

confidence: 99%

Characterization and 2,4-D adsorption of sepiolite nanofibers modified by N-cetylpyridinium cations

Bakhtiary

Shirvani

Shariatmadari

2013

Microporous and Mesoporous Materials

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A Mixed‐Metal Oxides/Graphitic Carbon Nitride: High Visible Light Photocatalytic Activity for Efficient Mineralization of Rhodamine B

Huy

Thao

Dao

et al. 2017

Adv Materials Inter

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Photocatalysis involves the excitation of semiconductor materials by light absorption to produce electron-hole pairs, following charge-pair separation to induce the oxidation of organic pollutants. [1b] Among various semiconductors, oxides of the elements Ti, Bi, Zn, and Sn are preferable materials for photocatalytic processes. [1a] However, most of them generally show poor efficiency in photocatalytic reactivity due to wide band gaps of the materials and relatively high recombination rates of electron-hole pairs. Various promising approaches using composite materials, morphology control, noble metal loading, and heterostructural construction have been explored to enhance photocatalytic activity of the semiconductor materials. [1a] However, these strategies often require complicated preparation procedures. Therefore, the search for simple compounds with an enhanced ability to degrade organic pollutants has been the focus in photocatalytic research area. Recently, graphitic carbon nitride (g-C 3 N 4 ) with a stacked 2D structure has received much attention as a metal-free semiconductor and is rapidly becoming a favorite in material science. With medium band gap and thermal/chemical stability in an ambient environment, g-C 3 N 4 has become one of the most promising photocatalytic materials. [2] More importantly, doping with metal ions or nonmetal ions to form active sites for optimal heterojunctions leading to modify the band gap and morphology has been achieved for efficient separation of pairs electrons and holes to enhance the photocatalytic performance of g-C 3 N 4 significantly. A number of studies on the photocatalytic performance of g-C 3 N 4 have been reported to date. [3] Layered double hydroxides (LDHs), a group of layered functional materials with a special octahedral microstructure, have the following major features: the chemical composition of the layers is adjustable, the type and number of interlayer anions is exchangeable, and the particle size distribution is controllable. [4] Recently, LDHs have received worldwide attention because of their multiple applications, such as adsorbents, [5] catalysts, and catalytic supports. [6] The general formula of LDHs is [M 1−x 2+ M x 3+ (OH) 2 ] x+ (A n− ) x/n : yH 2 O, where M 2+ and M 3+ are divalent (Ca 2+ , Mg 2+ , Zn 2+ , Ni 2+ , Cu 2+ ) and trivalent (Al 3+ , Fe 3+ , Cr 3+ ) metal Novel photocatalysts in the form of zinc oxide-zinc bismuth oxide (mixedmetal oxide [MMO]) and graphitic carbon nitride (CN) hybrid composites are developed via a co-precipitation method followed by calcination at 520 °C. The as-prepared MMO-CN hybrid composites are evaluated on the basis of their photocatalytic activities for Rhodamine B (RhB) in aqueous solutions under visible light irradiation. The strong electronic coupling between two components within the MMO-CN heterostructure, which suppresses the photogenerated recombination of electrons and holes to a remarkable extent, is revealed. The prepared composites exhibit an excellent photocatalytic activity, leading to mo...

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Adsorption of 2,4-D on Mg/Al–NO3 layered double hydroxides with varying layer charge density

Cited by 81 publications

References 27 publications

Preferential adsorption of 2,4-dichlorophenoxyacetate from associated binary-solute aqueous systems by Mg/Al-NO3 layered double hydroxides with different nitrate orientations

Preferential adsorption of 2,4-dichlorophenoxyacetate from associated binary-solute aqueous systems by Mg/Al-NO3 layered double hydroxides with different nitrate orientations

Characterization and 2,4-D adsorption of sepiolite nanofibers modified by N-cetylpyridinium cations

A Mixed‐Metal Oxides/Graphitic Carbon Nitride: High Visible Light Photocatalytic Activity for Efficient Mineralization of Rhodamine B

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