Exploration of As(III)/As(V) Uptake from Aqueous Solution by Synthesized Calcium Sulfate Whisker

Chen, Xiaojuan; Yang, Lei; Zhang, Junfeng; Huang, Yan

doi:10.1016/j.cjche.2014.09.018

Cited by 29 publications

(9 citation statements)

References 43 publications

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“…In the 2nd stage, As was removed by Ca(OH) 2 and the removal rate was 99.8 wt.%. The stability experiment showed that CO 3 2− had insignificant influence on the stability of precipitate. In the 3rd stage, Fe 2 (SO 4 ) 3 was utilized to reduce As in the solution down to 0.2 mg L −1 or even less, which met the discharge limited (0.3 mg L −1 ).…”

Section: Resultsmentioning

confidence: 97%

“…According to Fig. 6, the precipitate was relatively stable and the presence of CO 3 2− showed little effect on the stability of precipitate. The precipitate needs to be further solidified/stabilized due to the 30 wt.% arsenic content, although the solubility of arsenic was below 5 mg L −1 .…”

Section: Effect Of Co 3 2− On the Stability Of Precipitates In The 2nmentioning

confidence: 94%

“…To realize the effect of CO 3 2− on arsenic removal and the stability of precipitation in the 2nd stage, two neutralizers including CaCO 3 and Ca(OH) 2 were used in the 1st stage and lime was used to remove arsenic in the 2nd stage. The effect of CO 3 2− on arsenic removal and the stability of precipitates were therefore evaluated.…”

Section: Effect Of Co 3 2− On Arsenic Removal In the 2nd Stagementioning

confidence: 99%

“…The 2st stage focused on producing sediment with high arsenic content and reducing its total quantity with lime as a neutralizer. At the same time, the effect of CO 3 2− on the stability of precipitation was studied. The 3rd stage aims to further remove the residual arsenic to keep its content below 0.2 mg L −1 by addition of ferric sulfate.…”

Section: Introductionmentioning

confidence: 99%

“…It is widely known that toxicity of arsenic, even at low concentrations, can cause cancer [3,4]. Therefore, arsenic removal from dirty acid wastewater is a global critical issue.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A novel strategy for arsenic removal from dirty acid wastewater via CaCO3-Ca(OH)2-Fe(III) processing

Lü

Chen

et al. 2016

Journal of Water Process Engineering

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Section: Resultsmentioning

confidence: 97%

Section: Effect Of Co 3 2− On the Stability Of Precipitates In The 2nmentioning

confidence: 94%

Section: Effect Of Co 3 2− On Arsenic Removal In the 2nd Stagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…It is widely known that toxicity of arsenic, even at low concentrations, can cause cancer [3,4]. Therefore, arsenic removal from dirty acid wastewater is a global critical issue.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A novel strategy for arsenic removal from dirty acid wastewater via CaCO3-Ca(OH)2-Fe(III) processing

Lü

Chen

et al. 2016

Journal of Water Process Engineering

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Characterization and mechanism of natural rubber composites reinforced by modified calcium sulfate whisker

Qin

et al. 2023

J of Applied Polymer Sci

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This study concentrated on the mechanical properties of natural rubber (NR) composites [modified calcium sulfate whisker (MCSW)] and the reinforcement mechanism of MCSW on NR. First, anhydrous CSW with an orthogonal crystal system bottom center structure was prepared by hydrothermal method. Subsequently, MCSW was obtained by treating whiskers with inorganic, organic compounds, which effectively coated the surface of the whiskers with an average thickness of 40.85 nm, making the surface change from hydrophilic to hydrophobic. The CSW/MCSW filler was added to the NR under the optimum experimental conditions of 70°C, 12 min, 5 times of rolling, 140°C, and 1 h of curing time. The results showed that the tensile strength, elongation at break, and crosslink density of the NR composites with 15 phr of MCSW added were increased by 80.8%, 9.0%, and 80.2%, respectively, compared with the NR without the filler. The mechanism of MCSW improving the performance of composites was revealed from vulcanization kinetics and interfacial thermodynamics. In this work, a new type of high‐efficiency environmental protection NR filler reinforcing agent was developed.

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Synthesis of robust insoluble anhydrite whiskers from desulphurization gypsum containing organic matter via improved hydrothermal‐calcination process for the removal of lead and zinc ions

Liu

et al. 2022

J of Chemical Tech & Biotech

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Background: An improved hydrothermal-calcination method was used to convert desulphurization gypsum containing organic matter (OM-gypsum) to insoluble anhydrite (II-CaSO 4 ) whiskers, where OM-gypsum was directly transformed to soluble anhydrite (γ-CaSO 4 ) whiskers via the hydrothermal method followed by calcination. The synthesized II-CaSO 4 whiskers were applied for the removal of lead ion (Pb(II)) and zinc ion (Zn(II)).Results: The synthesized II-CaSO 4 whiskers possessed a smooth surface, large aspect ratio, and high whiteness of above 90%. The mother liquor after synthesis could be recycled. The synthesized II-CaSO 4 whiskers exhibited maximum adsorption capacities of 641.03 mg/g and 14.00 mg/g for Pb(II) and Zn(II), respectively, under optimal adsorption conditions. The pseudo-second-order model and Langmuir isotherm model were appropriate for describing the adsorption process of II-CaSO 4 whiskers. Compared with II-CaSO 4 whiskers calcined from hemihydrate gypsum and the short and columnar II-CaSO 4 crystals, the synthesized II-CaSO 4 whiskers in this work possessed a superior adsorption performance. Conclusion:The improved hydrothermal-calcination process could completely remove the organic matter from OM-gypsum, and the direct formation of γ-CaSO 4 intermediate helped avoid the lattice collapse caused by the removal of water molecules during calcination. The excellent adsorption performance of the synthesized II-CaSO 4 whiskers in this work could be attributed to their large negatively charged surface areas, which were formed by the large aspect ratio and excellent stability. This work provides a practical method for the comprehensive utilization of chemical gypsum containing organic impurities.

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Exploration of As(III)/As(V) Uptake from Aqueous Solution by Synthesized Calcium Sulfate Whisker

Cited by 29 publications

References 43 publications

A novel strategy for arsenic removal from dirty acid wastewater via CaCO3-Ca(OH)2-Fe(III) processing

A novel strategy for arsenic removal from dirty acid wastewater via CaCO3-Ca(OH)2-Fe(III) processing

Characterization and mechanism of natural rubber composites reinforced by modified calcium sulfate whisker

Synthesis of robust insoluble anhydrite whiskers from desulphurization gypsum containing organic matter via improved hydrothermal‐calcination process for the removal of lead and zinc ions

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