Regeneration of magnetic biochar derived from eucalyptus leaf residue for lead(II) removal

Wang, Shengye; Tang, Yankui; Chen, Cheng; Wu, Jintao; Huang, Zhining; Mo, Yayuan; Zhang, Kaixuan; Chen, Ji-bo

doi:10.1016/j.biortech.2015.03.139

Cited by 98 publications

(15 citation statements)

References 19 publications

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“…In the regeneration, there are used, cheap and easily accessible desorbing agents such as solutions of acids [32], salts, alkalis and complexing agents [18]. …”

Section: Resultsmentioning

confidence: 99%

“…In addition, the resulting sorbent is capable of simultaneous removal of phosphates and organic impurities which is important because these compounds coexist in wastewaters. Wang et al [18] investigated the regeneration of Pb-loaded magnetic biochar. This sorbent was prepared by mixing biochar (obtained from eucalyptus leaf residue) with FeCl 3 and FeSO 4 solutions and the addition of NaOH up to the pH value 10–11.…”

Section: Introductionmentioning

confidence: 99%

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Investigations of Heavy Metal Ion Sorption Using Nanocomposites of Iron-Modified Biochar

et al. 2017

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Magnetic biochar nanocomposites were obtained by modification of biochar by zero-valent iron. The article provides information on the impact of contact time, initial Cd(II), Co(II), Zn(II), and Pb(II) ion concentrations, dose of the sorbents, solution pH and temperature on the adsorption capacity. On the basis of experiments, it was found that the optimum parameters for the sorption process are phase contact time 360 min (after this time, the equilibrium of all concentrations is reached), the dose of sorbent equal to 5 g/dm3, pH 5 and the temperature 295 K. The values of parameters calculated from the kinetic models and isotherms present the best match to the pseudo second order and Langmuir isotherm models. The calculated thermodynamic parameters ∆H 0, ∆S 0 and ∆G 0 indicate that the sorption of heavy metal ions is an exothermic and spontaneous process as well as favoured at lower temperatures, suggesting the physical character of sorption. The solution of nitric acid(V) at the concentration 0.1 mol/dm3 was the best acidic desorbing agent used for regeneration of metal-loaded magnetic sorbents. The physicochemical properties of synthesized composites were characterized by FTIR, SEM, XRD, XPS and TG analyses. The point characteristics of the double layer for biochar pHPZC and pHIEP were designated.

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“…In the regeneration, there are used, cheap and easily accessible desorbing agents such as solutions of acids [32], salts, alkalis and complexing agents [18]. …”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigations of Heavy Metal Ion Sorption Using Nanocomposites of Iron-Modified Biochar

et al. 2017

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“…A convenient and economical regeneration method can significantly reduce the cost of transportation and also the amount of wasted contaminant loaded adsorbent [78]. The adsorption-regeneration cycle can be repeated a few times which demonstrates that the adsorption capacity may drop slightly during regeneration cycle.…”

Section: Regeneration Process Cost Analysismentioning

confidence: 99%

“…Some of the regeneration techniques include thermal regeneration [79], chemical and solvent regeneration [78,82], microwave [82], microbiological, electrochemical, ultrasonic, and wet air oxidation regeneration method. Three thermal methods are available for the regeneration of carbonaceous materials namely (i) pyrolysis, (ii) pyrolysis-gasification and (iii) gasification [83].…”

Section: Regeneration Process Cost Analysismentioning

confidence: 99%

Insight into biochar properties and its cost analysis

Ahmed

Zhou

Ngo

2016

Biomass and Bioenergy

281

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Highlights  Modified biochar preparatory processes have been summarized together with improvement of surface functionalities.  Modified biochar has enhanced sorptive capacity for contaminants.  Continuous fixed bed column model has been examined with applications.  Regeneration methods for modified biochar have been discussed.  Future research directions for modified biochar have been proposed.

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“…Most exhausted adsorbents including post-adsorption biochar may require stringent conditions to be properly disposed or regenerated, which increase the processing cost and the potential risks of secondary risks (Jiang et al 2018;Wan et al 2017;Wang et al 2015). In recent years, the concept of sustainability and environmental friendliness has stimulated research interests on self-regenerating adsorbents with both adsorptive ability and photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Facile one-step synthesis of graphitic carbon nitride-modified biochar for the removal of reactive red 120 through adsorption and photocatalytic degradation

Zheng

Yang

Zhang

et al. 2019

Biochar

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Converting waste biomass into value-added biochar has been considered as a green and sustainable strategy for resource management and pollution control. In this study, graphitic carbon nitride (g-C 3 N 4 ) modified biochars (BCs) were produced through one-pot pyrolysis of urea and hickory chips in differential ratios at 520 °C. The resulting BC/g-C 3 N 4 composites were evaluated in laboratory for their physicochemical, adsorptive, and photocatalytic properties. The characterization tests showed the successful synthesis of the BC/g-C 3 N 4 composites that introduced g-C 3 N 4 structure, N-containing surface functional groups, reduced surface area, and better thermal stability to the biochar. After modification, the BC/g-C 3 N 4 composites showed better adsorption ability to reactive red 120 (RR120) than the pristine BC, due to the strong electrostatic attrition between N-containing functional groups of g-C 3 N 4 on biochar surface and anionic RR120. The BC/g-C 3 N 4 composites also inherited g-C 3 N 4 's photocatalytic activity, which is visible light responsive to generate free radicals for RR120 degradation. In addition, the composites with higher urea modification ratios were more effective in the degradation of RR120. Overall, this study demonstrates the feasibility and promising potential of combining biochar and photocatalyst for the removal of aqueous dye. Because of the synergistic adsorption and photodegradation ability, BC/g-C 3 N 4 composites present a novel and cost-effective solution for the removal of aqueous dye and other photodegradable contaminants under natural conditions.

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Regeneration of magnetic biochar derived from eucalyptus leaf residue for lead(II) removal

Cited by 98 publications

References 19 publications

Investigations of Heavy Metal Ion Sorption Using Nanocomposites of Iron-Modified Biochar

Investigations of Heavy Metal Ion Sorption Using Nanocomposites of Iron-Modified Biochar

Insight into biochar properties and its cost analysis

Facile one-step synthesis of graphitic carbon nitride-modified biochar for the removal of reactive red 120 through adsorption and photocatalytic degradation

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