The removal and recovery of Cr(VI) by Li/Al layered double hydroxide (LDH)

Hsu, Liang-Ching; Wang, Shan‐Li; Tzou, Yu-Min; Lin, Cheng-Nan; Chen, J.H.

doi:10.1016/j.jhazmat.2006.08.024

Cited by 68 publications

(22 citation statements)

References 29 publications

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“…The adsorption capacity of LIG is therefore expected to be significantly greater than that of gibbsite. Previous studies on the adsorption of some inorganic and organic anions by LIG have demonstrated its reactivity toward these anions [26][27][28][29]. For example, a maximum adsorption of 3.81 mmol g −1 was previously reported for chromate [29].…”

Section: Introductionmentioning

confidence: 87%

Phosphate removal from water using lithium intercalated gibbsite

Wang

Cheng

Tzou

et al. 2007

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 87%

Phosphate removal from water using lithium intercalated gibbsite

Wang

Cheng

Tzou

et al. 2007

Journal of Hazardous Materials

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“…LDHs have positively charged layers of metal hydroxides and the anions and water molecules are located between the layers. The positive charges that are produce from the isomorphous substitution of divalent cations and trivalent cations, are counter balanced by anions located between the layers [14]. LDHs have a general formula of ( ) ) [15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Application of Mg/Al Layered Double Hydroxide for the Degradation of Congo Red in Aqueous Solution

Ayawei¹,

Angaye²,

Wankasi³

et al. 2015

OJPC

122

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The adsorption properties of layered double hydroxide (Mg/Al-CO3) for the removal of Congo Red (CR) dye from aqueous solution were studied. The layered double hydroxide was synthesized by co-precipitation method and characterized by X-ray diffraction (XRD), Fourier Transform Infrared spectroscopic (FTIR) and Energy-Dispersive X-ray Spectroscopic (EDX). The effects of various experimental parameters such as contact time, dye concentrations and temperature variation were investigated. The results show that the amount of Congo Red adsorbed increases with increase in temperature but decreases with increase in initial dye concentration and contact time. The data were also fitted to several kinetic models: zero-order kinetic model, first-order kinetic model, second-order kinetic model, pseudo-second-order kinetic model and third-order kinetic model respectively. The adsorption process was best defined by zero-order-kinetic model (R 2 = 1). Langmuir, Freundich, Temkin and Dubinin-kaganer-Radushkevich (DPK) adsorption isotherm models were applied to analyze adsorption data with Temkin isotherm being the most applicable to the adsorption process. Thermodynamic parameters e.g. ∆G o , ∆S o , ∆H o and ∆Hx of the adsorption process were found to be endothermic, spontaneous and feasible.

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“…Various LDHs with easily exchangeable anions, such as chloride-LDHs, have been explored as adsorbents to remove chromate contaminants in recent years [13][14][15][16][17][18][19]. For example, ZnAl-, MgAl-and ZnCr-Cl-LDHs were reported to adsorb ca.…”

Section: Introductionmentioning

confidence: 99%