Defluoridation by highly efficient calcium hydroxide nanorods from synthetic and industrial wastewater

Chaudhary, Mohit; Maiti, Abhijit

doi:10.1016/j.colsurfa.2018.10.052

Cited by 39 publications

(17 citation statements)

References 46 publications

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“…Here, the geochemical modeling with Visual Minteq 3.1 suggests that adsorption was the predominant reaction of As(V) removal at pH 6 whereas precipitation was the main mechanism at pH 8 ( Figure 3a). The saturation index (Table 1) The positive values of the saturation index indicate the supersaturated condition due to the formation of a particular product [24,25].…”

Section: Removal Of Heavy Metals As(v) and Zn(ii) And Turbidity Accormentioning

confidence: 99%

“…The saturation index (Table 1) calculated using Visual Minteq 3.1 confirms that Zn3(AsO4)2•2.5H2O(s) was the main species of As(V) precipitate at solution pH 8. The positive values of the saturation index indicate the supersaturated condition due to the formation of a particular product [24,25].…”

Section: Removal Of Heavy Metals As(v) and Zn(ii) And Turbidity Accormentioning

confidence: 99%

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A Hybrid Ion-Exchange Fabric/Ceramic Membrane System to Remove As(V), Zn(II), and Turbidity from Wastewater

et al. 2020

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Ceramic membranes and ion exchangers are effective at removing turbidity and ionic contaminants from water, respectively. In this study, we demonstrate the performance of a hybrid ion-exchange fabric/ceramic membrane system to treat metal ions and turbidity at the same time in synthetic wastewater. The removal rate of As(V) and Zn(II) by the ceramic membrane increased with solution pH, while turbidity was completely removed regardless of the solution pH. The main reaction of As(V) removal was adsorption at solution pH 6 and precipitation at solution pH 8, whereas phase-change was the predominant reaction for Zn(II) removal at both solution pH values. The removal efficiency of the ion-exchange fabric was affected by the solution pH, with the maximum removal capacity of As(V) occurring at solution pH 4. The As(V) adsorption capacity of the ion-exchange fabric reached equilibrium within 120 min. The ion-exchange capacity of the ion-exchange fabric was compared with commercial ion-exchange fibers. The regeneration efficiency of the ion-exchange fabric using 0.1 M NaCl solution was around 95% on average and decreased slightly as the number of regeneration cycles was increased. Over 80% of As(V) and Zn(II) were steadily removed at solution pH 6 by the hybrid ion-exchange fabric/ceramic membrane system. Reduced flow rate and removal capacity were recovered through a backwashing process during continuous treatment with the hybrid ion-exchange fabric/ceramic membrane system.

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Section: Removal Of Heavy Metals As(v) and Zn(ii) And Turbidity Accormentioning

confidence: 99%

Section: Removal Of Heavy Metals As(v) and Zn(ii) And Turbidity Accormentioning

confidence: 99%

A Hybrid Ion-Exchange Fabric/Ceramic Membrane System to Remove As(V), Zn(II), and Turbidity from Wastewater

et al. 2020

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“…This valorization can produce CaO and Ca(OH) 2 , which has the capacity to effectively remove phosphate. The nanoscale size of produced product provides enormous surface area and activated surface for effective adsorption of phosphorus, fluoride, and many other heavy metals such as Pb, Cu, As, and Cd [16][17][18]. Numerous studies have been performed on bioceramics, lime sludge, and red mud (~46 wt.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Lime Mud Waste from Paper Mills for Efficient Phosphorus Removal

Khan

Ramakrishna

et al. 2019

Sustainability

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In this study, we utilized lime mud waste from paper mills to synthesize calcium hydroxide (Ca(OH)2) nanoparticles (NPs) and investigate their application for the removal of phosphorus from aqueous solution. The NPs, composed of green portlandite with hexagonal shape, were successfully produced using a precipitation method at moderately high temperature. The crystal structure and characterization of the prepared Ca(OH)2 nanoparticles were analyzed by field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. The effects of Ca(OH)2 NP dosage and contact time on removal of phosphorus were also investigated. The results show that the green portlandite NPs can effectively remove phosphorus from aqueous solution. The phosphorus removal efficiencies within 10 min are 53%, 72%, 78%, 98%, and 100% with the different mass ratios of Ca(OH)2 NPs/phosphorus (CNPs/P) of 2.2, 3.5, 4.4, 5.3, and 6.2, respectively. Due to the efficient phosphorus removal, the calcium hydroxide nanoparticles (CNPs) could be a potential candidate for this application in domestic or industrial wastewater treatment.

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“…F-containing wastewater can be treated by chemical precipitation method [20,21], coagulation and precipitation method [22,23], adsorption method [24][25][26][27][28][29], electrocoagulation method [20,[30][31][32][33], reverse osmosis method [34][35][36], and ion exchange method [37,38]. Generally, chemicals such as CaCl 2 and CaO are added for precipitating fluoride in wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…Zeng, Ling, Li, Luo, Sui and Guan [20] used 0.84 g/L CaCl 2 to precipitate fluoride in synthetic water with 400 mg/L F − , 15.2 mg/L Ca 2+ and 2.16 Mg 2+ , with high fluoride removal of 95.73%. Calcium hydroxide nanorods with dosage of 2 g/L were adopted for fluoride precipitation in acidic electroplating industrial wastewater containing 75 mg/L, with F − removal of 91.7% [21]. The coagulation and precipitation methods remove F − by adding a coagulant, such as iron salt (polyferric sulfate) and aluminum salt (polyaluminum sulfate), to produce a gelatinous substance.…”

Section: Introductionmentioning

confidence: 99%

Precipitation Methods Using Calcium-Containing Ores for Fluoride Removal in Wastewater

et al. 2019

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F-containing wastewater does great harm to human health and the ecological environment and thus needs to be treated efficiently. In this paper, the new calcium-containing precipitant calcite and aided precipitant fluorite were adopted to purify F-containing wastewater. Relevant reaction conditions, such as reaction time, oscillation rate, dosage of hydrochloric acid, calcite dosage and the assisting sedimentation performance of fluorite, and action mechanism are analyzed. The experiment showed that the removal rate of fluoride in simulated wastewater reached 96.20%, when the reaction time, the dosage of calcite, the dosage of 5% dilute hydrochloric acid, and the oscillation rate was 30 min, 2 g/L, 21.76 g/L, and 160 r/min, respectively. Moreover, the removal rate of fluoride in the actual F-containing smelting wastewater reaches approximately 95% under the optimum condition of calcite dosage of 12 g/L, reaction time of 30 min, and oscillation rate of 160 r/min. The addition of fluorite significantly improves the sedimentation performance of the reactive precipitates. The experimental results showed that calcite and fluorite can effectively reduce the concentration of fluoride ions in F-containing wastewater and solve the problem of slow sedimentation of reactive precipitates.

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Defluoridation by highly efficient calcium hydroxide nanorods from synthetic and industrial wastewater

Cited by 39 publications

References 46 publications

A Hybrid Ion-Exchange Fabric/Ceramic Membrane System to Remove As(V), Zn(II), and Turbidity from Wastewater

A Hybrid Ion-Exchange Fabric/Ceramic Membrane System to Remove As(V), Zn(II), and Turbidity from Wastewater

Utilization of Lime Mud Waste from Paper Mills for Efficient Phosphorus Removal

Precipitation Methods Using Calcium-Containing Ores for Fluoride Removal in Wastewater

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