Removal of chloride ion from aqueous solution by ZnAl-NO3 layered double hydroxides as anion-exchanger

Lv, Liang; Sun, Peide; Gu, Zhengyu; Du, Hangeng; Pang, Xinyi; Xin, Tao; Xu, Renjie; Xu, Lili

doi:10.1016/j.jhazmat.2008.04.114

Cited by 160 publications

(70 citation statements)

References 18 publications

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“…The Langmuir parameter of q e 0 is the upper limit for q e and represents the maximum sorption of the ion determined by the number of reactive surface sorption sites (Bradl 2004). The q e 0 values for anthracite coal, limestone, and pozzolan were in the range of 55 and 98 mg g -1 , in agreement with the literature (Lv et al 2009). …”

Section: Removal Of CLsupporting

confidence: 90%

Potential of anthracite, dolomite, limestone and pozzolan as reactive media for de-icing salt removal from road runoff

Santiago-Martín

Michaux

Guesdon

et al. 2016

Int. J. Environ. Sci. Technol.

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De-icing salt (NaCl) application is a common practice during winter road maintenance in northern countries, compromising ecosystem services. Ecoengineering facilities, including reactive filter beds, are becoming an effective strategy for road runoff management. Different materials (anthracite coal, dolomite, limestone, and pozzolan) were tested as reactive media of filter beds. Characterization showed that dolomite has the best physical properties (resistance to fragmentation, porosity) for filter bed construction and maintenance, followed by limestone. NaCl removal efficiency was investigated in batch at different concentrations (150-5000 mg L -1 Cl). Removal efficiency substantially varied depending on the element (Cl or Na), the material, and the added NaCl concentration. At the lowest NaCl concentration, Cl removal was higher onto anthracite (48 %) and dolomite (59 %); but greater Na removal was reached onto limestone (54 %) and pozzolan (67 %). At higher concentrations, Cl removal was similar (anthracite), decreased (dolomite), or increased (limestone, pozzolan); and Na removal increased (anthracite) or decreased (dolomite, limestone, pozzolan). Parallel experiments at 4°C showed lower NaCl removal, anthracite being the most efficient. Practical applicability was evaluated in columns using synthetic runoff solution (NaCl and metals). NaCl removal efficiency was much lower in column assays with respect to batch. The highest NaCl removal was reached onto dolomite, followed by limestone. Metals were successfully removed, generally remaining over time in a wide range (41-89 % Cd, 78-97 % Ni, 44-88 % Cu, and 3-83 % Zn) depending on the material, being pozzolan the least efficient. Further studies including a combination of materials would be of high interest.

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Section: Removal Of CLsupporting

confidence: 90%

Potential of anthracite, dolomite, limestone and pozzolan as reactive media for de-icing salt removal from road runoff

Santiago-Martín

Michaux

Guesdon

et al. 2016

Int. J. Environ. Sci. Technol.

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“…The presence of the curcumin in the ZLH interlayers was also elucidated by FTIR spectroscopy, which supported the PXRD results [19]. Figure 2 exhibited the FTIR spectrum of pure ZnO, curcumin, and ZiCUR.…”

Section: Fourier Transform Infrared Analysissupporting

confidence: 76%

Intercalation Study of Curcumin Into Zinc Layered Hydroxide

Jaafar¹

2016

MJAS

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Zinc layered hydroxide (ZLH) intercalated with curcumin was successfully prepared by ion exchange method. The synthesised nanocomposite was characterised by Powder X-ray diffraction (PXRD) and Fourier transform infrared spectroscopy (FTIR). The obtained intercalation compound, ZLH-curcumin nanocomposite (ZiCUR), showed a basal spacing of 10.0 Å when 0.01M of curcumin solution was used in the synthesis. The shifting in the stretching frequency of the curcumin anion provides strong evidence that the anion is bonded to the ZLH through electrostatic force. In FTIR, after intercalation, there is a noticeable shift of the O-H stretching vibrational bands. This is due to the formation of strong hydrogen bonds between curcumin and -OH groups in ZLH. Thus, this indicates that curcumin anions are present in the sample and were intercalated between positively charged ZLH layers, as indicated by the characteristics of PXRD pattern.Keywords: zinc layered hydroxide, curcumin, ion exchange method Abstrak Zink hidroksida berlapis (ZHB) disisip bersama kurkumin telah berjaya disediakan menggunakan kaedah pertukaran ion. Komposit nano yang telah di sintesis dicirikan menggunakan X-ray Serbuk Pembelauan dan Spektroskopi Infra Merah Transformasi Fourier. Sebatian interkalasi yang diperoleh iaitu komposit nano zink hidrosida berlapis-kurkumin, menunjukkan jarak basal sebanyak 10.0 Å apabila kepekatan 0.01M larutan kurkumin digunakan semasa proses sintesis. Perubahan pada frekuensi anion kurkumin menunjukkan bukti yang kukuh di mana anion telah dilekatkan kepada ZHB menggunakan daya elektrostatik. Melalui Spektroskopi Infra Merah Transformasi Fourier, selepas interkalasi, perubahan yang ketara pada O-H regangan jalur getaran dapat di lihat. Hal ini kerana, pembentukan ikatan hidrogen yang kuat antara kurkumin dan kumpulan -OH di dalam ZHB. Maka, ia menunjukkan bahawa anion kurkumin hadir di dalam sampel dan telah disisipkan antara lapisan ZHB yang bercas positif, seperti mana yang ditunjukkan oleh ciri -ciri corak Spektroskopi Infra Merah Transformasi Fourier.

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“…An option to complement the conventional biological treatment of textile effluents is the use of a physicochemical step of pre-or posttreatment. Several studies demonstrated that the group of hydrotalcites, which are layered double hydroxides (LDH) or anionic clays, are efficient materials to adsorb and/or intercalate anionic compounds such as sulphate dyes and surfactants, halides, sulfates, nitrates, silicates, chlorides, and polymers (Barriga et al, 2002;Bouraada et al, 2009;Bouraada et al, 2008;Cardoso et al, 2003;Cavani et al, 1991;Das et al, 2007;Das et al, 2006;Dias et al, 2011;Lazaradis et al, 2003;Lv et al, 2009;Lv et al, 2008b;Seida and Nakano, 2002;Ulibarri et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Use of calcined layered double hydroxides for the removal of color and organic matter from textile effluents: kinetic, equilibrium and recycling studies

Teixeira

Aquino

Pereira

et al. 2014

Braz. J. Chem. Eng.

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-This paper presents data for the synthesis and characterization of layer double hydroxides (LDH) and their use for color and chemical oxygen demand (COD) removal from effluents generated by a textile industry. Adsorption studies with raw and biologically treated (activated sludge) textile effluent showed that the pseudo-second order model best fitted the experimental data, leading to adsorption coefficients of 39.1 and 102.9 mgCOD/gLDH for raw and treated effluents, respectively. The best conditions for color and COD removal were obtained at lower values of temperature and pH (25 °C and pH 7) and, in these conditions, an LDH dose of 10 g/L resulted in color removal efficiencies of 56% for samples of raw and 66% for samples of treated effluent. Recycling studies indicated that the reuse of thermally treated LDH led to a progressive loss in the removal efficiencies of COD and color. The reduction was more pronounced with samples of the raw textile effluent. LDH characterization performed before and after each adsorption and regeneration experiment showed that there was no intercalation of dye molecules in the interlayer region of the LDH, indicating that COD and color removal might be due to the adsorption of organic molecules onto the LDH surface.

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Removal of chloride ion from aqueous solution by ZnAl-NO3 layered double hydroxides as anion-exchanger

Cited by 160 publications

References 18 publications

Potential of anthracite, dolomite, limestone and pozzolan as reactive media for de-icing salt removal from road runoff

Potential of anthracite, dolomite, limestone and pozzolan as reactive media for de-icing salt removal from road runoff

Intercalation Study of Curcumin Into Zinc Layered Hydroxide

Use of calcined layered double hydroxides for the removal of color and organic matter from textile effluents: kinetic, equilibrium and recycling studies

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