Removal of Pb(II) from aqueous solutions by adsorption on magnetic bentonite

Zou, Chenglong; Jiang, Wei; Liang, Jiyan; Sun, Xiaohang; Guan, Yinyan

doi:10.1007/s11356-018-3652-0

Cited by 100 publications

(38 citation statements)

References 35 publications

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“…As shown in Table , the R 2 value of the Langmuir model was larger compared to the Freundlich model, therefore, the Langmuir isotherm model better describe the desorption behaviour of Pb(II) on M−B. The maximum residual adsorption amount of Pb(II) ions on M−B was 5.291 mg g –1 , while the adsorption saturation capacity calculated as 80.65 mg g –1 in our previous study . After the M−B saturated with Pb(II) ions was desorbed and regenerated under the experimental conditions of desorption.…”

Section: Resultssupporting

confidence: 48%

“…Before the desorption regeneration experiments, the Pb(II) ions was adsorbed by M−B. According to our previous study, the adsorption experiment was investigated at 35 °C, pH 5.0, initial Pb(II) concentration of 200 mg L –1 , and M−B dosage of 10.0 g L –1 . After contacting for 90 min, the adsorption reached equilibrium, the residual Pb(II) concentration ( c e1 ) of 2.81 mg L –1 was determined.…”

Section: Resultsmentioning

confidence: 99%

“…The K F value of Freundlich adsorption isotherm model reflects the adsorption affinity and adsorption capacity of adsorbent to adsorbate ,. The K F value calculated was 9.188 during Pb(II) ions adsorption on M−B in our previous study, while the K F value in the desorption process significantly decreased to 0.043 in this study. It indicated that the adsorption affinity and the adsorption capacity of M−B to Pb(II) ions decreased under the desorption condition, resulted in desorption occurring.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous study, magnetic bentonite (M−B) was prepared to solve the separation problem and improve the operability. It showed effective performance on the Pb(II) adsorption, about 98.9% adsorption removal rate was achieved within 90 min at adsorbent dosage of 10 g L –1 for initial Pb(II) concentration of 200 mg L –1 at 40 °C and pH 5.0.…”

Section: Introductionmentioning

confidence: 99%

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Desorption Regeneration Performance of Magnetic Bentonite after Pb(II) Adsorbed

et al. 2019

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Bentonite and its modifications have been widely used in the environmental pollution control and adsorption of heavy metals ions due to the large surface area, high adsorption capacity and low cost. However, it will become hazardous solid waste after saturation adsorption with a difficult problem to treat it. So the saturated adsorbent after adsorption of heavy metal ions needs to be disposed of properly. It will be of great scientific and economic value to study the regeneration recycling of bentonite after heavy metals ions adsorption. Desorption regeneration of magnetic bentonite (MÀ B) after Pb (II) adsorption with NaNO 3 solution was studied in this paper. The effects of several parameters on desorption regeneration were explored and it showed effective desorption regeneration performance. The desorption rate reached 90.21% using 50 mL g -1 and 1.00 mol L -1 NaNO 3 desorption liquid at pH 3.0, 35°C for the first time.The desorption process better conformed to the second-order kinetic equation and the Langmuir model. The physical and chemical feature of regenerated MÀ B and the original were comparatively analyzed by XRD, FT-IR, SEM and BET. It showed that MÀ B still remained stable structure after 6 times adsorption-desorption cycles. The study will provide useful experiences and references for its high effective utilization.[a] Dr.

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Section: Resultssupporting

confidence: 48%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Desorption Regeneration Performance of Magnetic Bentonite after Pb(II) Adsorbed

et al. 2019

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“…Due to Pb(II)'s high toxicity, the United States Environmental Protection Agency (USEPA) has set a very low tolerance limit of Pb(II) (0.015 mg/L) for drinking water [4]. Various techniques are used for the removal of heavy metals from water and wastewater, including chemical sedimentation [5], ion exchange [6], membrane [7], and adsorption [8][9][10][11]. Among them, adsorption is appealing owing to its simple application, low cost, and remarkable efficiency.…”

Section: Introductionmentioning

confidence: 99%

Uptake of Pb(II) Ions from Simulated Aqueous Solution via Nanochitosan

et al. 2019

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In this work, nanochitosan (NC) was prepared through ionic gelation using low molecular weight chitosan and maleic acid (MA). The synthesized NC was characterized by atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). During preparation, the particle size of the material depended on parameters such as concentration of chitosan and pH of the aqueous solution. After controlling the mentioned parameters, NC smaller than 100 nm was prepared. The chitosan and prepared NC were employed for the adsorption of Pb(II) from an aqueous solution in the form of a batch system. Among the sorption parameters, pH showed the strongest effect on the sorption process and removal of the maximum number of Pb(II) ions was obtained at pH value of 6. Pseudo-first-order and pseudo-second-order models were used to track the kinetics of the adsorption process. Langmuir and Freundlich’s isotherms were subjected to the absorption data to evaluate absorption capacity. NC proved to be an excellent adsorbent with a remarkable capacity to eliminate Pb(II) ions from aqueous solutions at multiple concentrations. The NC also showed better performance with a comparatively easier preparation process than in other reported work.

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Retracted: Adsorption of Pb(II) and Cd(II) by magnetic chitosan‐salicylaldehyde Schiff base: Synthesis, characterization, thermal study and antibacterial activity

Hachem

Jasim

Al‐Gazally

et al. 2022

J Chinese Chemical Soc

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In this paper, new magnetic chitosan‐salicylaldehyde Schiff base (ChS@Fe2O3) was prepared and characterized by FT‐IR, DSC, XRD, VSM and SEM and utilized as an efficient sorbent for the removal of Pb(II) and Cd(II) ions from aqueous solution. Moreover, the effect of solution pH, Pb(II) and Cd(II) initial concentration, adsorbent dosage and contact time on the adsorption process was examined thoroughly and optimized. Also, the adsorbent reusability and adsorption mechanism were studied. The sorption capacity of Pb(II) and Cd(II) ions at optimum condition was found to be 135.8 and 114.8 mg/g, respectively. The adsorption efficiency of ChS@Fe2O3 remained above 88 and 72%, respectively for Pb(II) and Cd(II) ions. Finally, antibacterial activities evaluation of ChS@Fe2O3 were conducted against S. aureus, B. cereus, E. coli and P. aeruginosa bacteria strains. The results exhibited the high activity against all bacteria strains.

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Removal of Pb(II) from aqueous solutions by adsorption on magnetic bentonite

Cited by 100 publications

References 35 publications

Desorption Regeneration Performance of Magnetic Bentonite after Pb(II) Adsorbed

Desorption Regeneration Performance of Magnetic Bentonite after Pb(II) Adsorbed

Uptake of Pb(II) Ions from Simulated Aqueous Solution via Nanochitosan

Retracted: Adsorption of Pb(II) and Cd(II) by magnetic chitosan‐salicylaldehyde Schiff base: Synthesis, characterization, thermal study and antibacterial activity

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