Lead and uranium sorptive removal from aqueous solution using magnetic and nonmagnetic fast pyrolysis rice husk biochars

Wang, Shujuan; Guo, Wei; Gao, Fan; Wang, Yunkai; Gao, Yue

doi:10.1039/c7ra13540h

Cited by 66 publications

(24 citation statements)

References 56 publications

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“…The markedly higher decrease in the adsorption capacity of Co 2+ ions on the biosorbent during the adsorption–desorption cycles as compared to TT confirmed the different adsorption behavior. In addition, four adsorption–desorption cycles practically did not affect the magnetic separation of biosorbent ( Figure 11 ), confirming the very good stability of microwave synthesized nanoparticles and microparticles of iron oxides impregnated on the biomass surface also in an acidic environment (0.1 M HCl and 0.1 M CH 3 COOH), which is in agreement with the study of Wang et al [ 43 ]. Moreover, as was pointed out by Philben et al [ 44 ], the physical and chemical structure of moss cell walls cause their high persistence in the environment, and this could also contribute to their notable biocomposite stability.…”

Section: Resultssupporting

confidence: 90%

Magnetically Functionalized Moss Biomass as Biosorbent for Efficient Co2+ Ions and Thioflavin T Removal

et al. 2020

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Microwave synthesized iron oxide nanoparticles and microparticles were used to prepare a magnetically responsive biosorbent from Rhytidiadelphus squarrosus moss for the rapid and efficient removal of Co2+ ions and thioflavin T (TT). The biocomposite was extensively characterized using Fourier transformed infrared (FTIR), XRD, SEM, and EDX techniques. The magnetic biocomposite showed very good adsorption properties toward Co2+ ions and TT e.g., rapid kinetics, high adsorption capacity (218 μmol g−1 for Co and 483 μmol g−1 for TT), fast magnetic separation, and good reusability in four successive adsorption–desorption cycles. Besides the electrostatic attraction between the oxygen functional moieties of the biomass surface and both Co2+ and TT ions, synergistic interaction with the –FeOH groups of iron oxides also participates in adsorption. The obtained results indicate that the magnetically responsive biocomposite can be a suitable, easily separable, and recyclable biosorbent for water purification.

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Section: Resultssupporting

confidence: 90%

Magnetically Functionalized Moss Biomass as Biosorbent for Efficient Co2+ Ions and Thioflavin T Removal

et al. 2020

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“…From the perspective of magnetic medium, iron oxides such as Fe 3 O 4 and γ-Fe 2 O 3 , have been studied largely due to their low cost of raw materials (a wide range of ferric salts) and ease of synthesis (Chen et al 2011;Han et al 2015;Liu et al 2019b;Rajapaksha et al 2016;Wang et al 2018a). Pure metals such as Fe and Co are magnetic; thus, magnetic biochars can be obtained when they are coated on biochar (Wang et al 2017;Yang et al 2018;Zhou et al 2014;Zhu et al 2017a).…”

Section: Magnetic Biocharsmentioning

confidence: 99%

Application of biochar-based materials in environmental remediation: from multi-level structures to specific devices

Wang

et al. 2020

Biochar

144

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The development of biochar has triggered a hot-spot in various research fields including agriculture, energy, environment, and materials. Biochar-based materials provide a novel approach against environmental challenging issues. Considering the rapid development of biochar materials, this review serves as a valuable platform to summarize the recent progress on the theoretical investigation and engineering applications of biochar materials in environmental remediation. For a better understanding of the structure-application relationships, the structural properties of biochar from macroscopic and microscopic aspects are summarized. The multilevel structures including elements, phases, surface chemistry, and molecular are highlighted to elucidate the multi-functional properties of biochars. Sorption, catalysis, redox reaction, and biological activity of biochar are briefly illustrated, which influence the transport, transformation, and removal of organic and inorganic pollutants in the environments. According to the multi-level structures and structure-application relationships of biochar, specific biocharbased materials and devices have been designed for practical environmental application. The important progress on the functionalization and device of biochar-based materials, including magnetic biochars, 2D and 3D biochar-based macrostructures, immobilized microorganism on biochar, and biochar-amended biofilters are highlighted. The environmental friendliness and sustainability of biochar-based materials, considering the whole cycle from synthesis to application, are evaluated.

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“…Use of the biochar-based magnetic materials to remove the heavy metal pollutants from the aqueous solutions not only exhibits high removal performance but also enables the spent adsorbents to be easily disposed using a low strength magnetic separation device [ 14 ]. In the recent literature, studies concerning the magnetic biochars used for controlling the heavy metal pollution, a variety of magnetic components were loaded/coated on the biochars derived from a wide range of biomass sources, thus, improving the structure and functionality [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. The most commonly utilized magnetic substances are magnetite (Fe 3 O 4 ) and maghemite (γ-Fe 2 O 3 ).…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, cobalt ferrite (CoFe 2 O 4 ) was combined by Reddy et al with the pine bark biochar for achieving the magnetic biochar material with excellent adsorption performance of Pb(II) and Cd(II) [ 26 ]. Recently, Wang et al reported the preparation of magnetic greigite/biochar composites (MGBs) using less-commonly used Fe 3 S 4 nanosheets as a magnetic modifier, thereby, demonstrating the efficient removal of Cr (VI) on MGBs [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Adsorption of CuFe2O4-Loaded Corncob Biochar for Pb(II)

Zhao

Cai

et al. 2020

Molecules

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A series of the magnetic CuFe2O4-loaded corncob biochar (CuFe2O4@CCBC) materials was obtained by combining the two-step impregnation of the corncob biochar with the pyrolysis of oxalate. CuFe2O4@CCBC and the pristine corncob biochar (CCBC) were characterized using XRD, SEM, VSM, BET, as well as pHZPC measurements. The results revealed that CuFe2O4 had a face-centered cubic crystalline phase and was homogeneously coated on the surface of CCBC. The as-prepared CuFe2O4@CCBC(5%) demonstrated a specific surface area of 74.98 m2·g−1, saturation magnetization of 5.75 emu·g−1 and pHZPC of 7.0. The adsorption dynamics and thermodynamic behavior of Pb(II) on CuFe2O4@CCBC and CCBC were investigated. The findings indicated that the pseudo-second kinetic and Langmuir equations suitably fitted the Pb(II) adsorption by CuFe2O4@CCBC or CCBC. At 30 °C and pH = 5.0, CuFe2O4@CCBC(5%) displayed an excellent performance in terms of the process rate and adsorption capacity towards Pb(II), for which the theoretical rate constant (k2) and maximum adsorption capacity (qm) were 7.68 × 10−3 g·mg−1··min−1 and 132.10 mg·g−1 separately, which were obviously higher than those of CCBC (4.38 × 10−3 g·mg−1·min−1 and 15.66 mg·g−1). The thermodynamic analyses exhibited that the adsorption reaction of the materials was endothermic and entropy-driven. The XPS and FTIR results revealed that the removal mechanism could be mainly attributed to the replacement of Pb2+ for H+ in Fe/Cu–OH and –COOH to form the inner surface complexes. Overall, the magnetic CuFe2O4-loaded biochar presents a high potential for use as an eco-friendly adsorbent to eliminate the heavy metals from the wastewater streams.

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Lead and uranium sorptive removal from aqueous solution using magnetic and nonmagnetic fast pyrolysis rice husk biochars

Abstract: This paper discusses the sorption characteristics of Pb(ii) and U(vi) on magnetic and nonmagnetic rice husk biochars.

Cited by 66 publications

References 56 publications

Magnetically Functionalized Moss Biomass as Biosorbent for Efficient Co2+ Ions and Thioflavin T Removal

Magnetically Functionalized Moss Biomass as Biosorbent for Efficient Co2+ Ions and Thioflavin T Removal

Application of biochar-based materials in environmental remediation: from multi-level structures to specific devices

Study on the Adsorption of CuFe2O4-Loaded Corncob Biochar for Pb(II)

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