Adsorption behavior and mechanism of Cd(II) on loess soil from China

Wu, Yan; Tang, Xiaowu; Chen, Yunmin; Zhan, Liangtong; Li, Zhenze; Tang, Qiang

doi:10.1016/j.jhazmat.2009.06.121

Cited by 143 publications

(46 citation statements)

References 43 publications

(46 reference statements)

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“…However, the assessment of pH effects by conventional methods was not possible in this study due to the rapid degradation of calcite-water equilibrium in an open system. Therefore, we adopted another method reported earlier, 9) in which a calcite-rich adsorbent was used. The adsorbent (10 g L À1 ) was added to Cd(II) solutions (100 mg L À1 , 100 mL) of which initial pH was fixed at the desired values (from 4 to 11) in advance.…”

Section: Effect Of Solution Phmentioning

confidence: 99%

“…Wang et al 9) showed a diagram of Cd(II) species distribution in the presence of calcite in an open system: The maximum amount of CdCO 3 precipitation was 17% at pH 9.5 and Cd(OH) 2 30 to 90% at pH range of 10-11. Therefore, it is obvious that Cd(II) precipitation as CdCO 3 or Cd(OH) 2 may participate in the Cd(II) removal in higher pH range than 9.…”

Section: Effect Of Solution Phmentioning

confidence: 99%

“…Many studies have been performed to seek inexpensive alternative adsorbents for Cd removal using natural or industrial wastes. [7][8][9] Gypsum is produced as a byproduct from flue gas desulfurization (FGD) systems which are applied to control SO x gas at coal-fired power plants. It is known as FGD gypsum and its annual worldwide production reaches approximately 7 million tons per year.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Cd(II) on Waste Calcite Produced by the Carbonation of Flue Gas Desulfurization (FGD) Gypsum

et al. 2011

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The waste calcite, by-product of the carbonation reaction of flue gas desulfurization (FGD) gypsum, was evaluated as low-cost adsorbent for Cd(II) removal from wastewater. Batch experiments were performed in aqueous solution varying contact time, initial pH of Cd(II) solution, adsorbent dose, and Cd(II) concentration. The sorption rate of Cd(II) on the adsorbent was high during initial 1 h and decreased slowly reaching a plateau after about 12 h. The adsorption kinetics of Cd(II) could be best described by the pseudo-second order model while its isotherm was found to fit with the Langmuir model. The maximum adsorption capacity was 7.99 mg g À1 . It is believed that waste calcite would be an addition to the list of low-cost adsorbents for Cd(II) removal in wastewater treatment.

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Section: Effect Of Solution Phmentioning

confidence: 99%

Section: Effect Of Solution Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption of Cd(II) on Waste Calcite Produced by the Carbonation of Flue Gas Desulfurization (FGD) Gypsum

et al. 2011

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“…The q e value increased from 52.33 to 81.58 mg g −1 for PAA-Bent and from 33.51 to 57.08 mg g −1 for Bent, with doubling the initial Pb concentration from 400 to 800 mg L −1 . There was a decrease in the rate constant k 2 for PAA-Bent and Bent when increasing the initial Pb concentration from 400 to 800 mg L −1 ( Table 3), confirming that the solution with lower Pb concentration reaches equilibrium faster [49].…”

Section: Lead Sorption Kineticsmentioning

confidence: 64%

Kinetics and thermodynamics of Pb sorption onto bentonite and poly(acrylic acid)/bentonite hybrid sorbent

Rafiei

Shirvani

Ogunseitan

2016

Desalination and Water Treatment

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“…A relatively high initial concentration (100 mg/L, 0.89 mM) was selected for Cd(II) solution since it is the common value in engineering sorption studies. 15,16) 2. Experimental Procedure…”

Section: Introductionmentioning

confidence: 99%

Enhanced Cd(II) Uptake by the Bassanite Phase Contained in Waste Calcite Produced via the Carbonation of Flue Gas Desulfurization (FGD) Gypsum

et al. 2011

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The uptake of Cd(II) by waste calcite, a by-product of the carbonation of flue gas desulfurization (FGD) gypsum, was investigated in a batch experiment. The uptake of Cd(II) by and the dissolution of Ca(II) from the waste calcite particles were monitored simultaneously as a function of exposure time to 0.89 mM Cd(II) solution. The reagent-grade calcite particles were also examined for a comparative study. The waste calcite contained bassanite, dolomite, and muscovite as the major impurity phases. X-ray diffraction study revealed that the bassanite phase dissolved almost completely during the 1st hour of the exposure to the solution while other phases were intact for two days. The amount of removed Cd(II) was found to be proportionally related to dissolved Ca(II) reflecting the exchange nature of the adsorption. The use of waste calcite instead of reagent-grade calcite enhanced Ca(II) dissolution and thereby Cd(II) uptake significantly. The waste calcite removed about 90% of initial Cd(II) while reagent calcite removed only 6% during the exposure for 2 days to 0.89 mM Cd(II) solution. The enhanced Ca(II) dissolution and Cd(II) uptake by the waste calcite were attributed to the fast-dissolving bassanite phase which provides the substantial quantity of Ca(II) and sulfate ions to the calcite/solution interface.

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Adsorption behavior and mechanism of Cd(II) on loess soil from China

Cited by 143 publications

References 43 publications

Adsorption of Cd(II) on Waste Calcite Produced by the Carbonation of Flue Gas Desulfurization (FGD) Gypsum

Adsorption of Cd(II) on Waste Calcite Produced by the Carbonation of Flue Gas Desulfurization (FGD) Gypsum

Kinetics and thermodynamics of Pb sorption onto bentonite and poly(acrylic acid)/bentonite hybrid sorbent

Enhanced Cd(II) Uptake by the Bassanite Phase Contained in Waste Calcite Produced via the Carbonation of Flue Gas Desulfurization (FGD) Gypsum

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