A novel magnetic biochar/MgFe-layered double hydroxides composite removing Pb2+ from aqueous solution: Isotherms, kinetics and thermodynamics

Yang, Jia; Zhang, Yingshuang; Fu, Jiangang; Yuan, Liangxiao; Li, Zheng; Liu, Chang; Zhao, Donglin; Wang, Xiaobo

doi:10.1016/j.colsurfa.2019.01.064

Cited by 164 publications

(36 citation statements)

References 46 publications

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“…The positive values of ΔS 0 represented the increased randomness at the interfaces in the adsorption progress. These behaviors of RhB adsorption to the AMBC agreed with the adsorption of Pb 2+ , Congo red, Titan yellow and other pollutants onto the biomass-derived MBC [38,39].…”

Section: Rhb Adsorption Isothermssupporting

confidence: 71%

“…However, the removal efficiency of RhB from the simulated wastewater decreased to 71.6% after 3 cycles, which is significantly lower than that of RhB in pure water (92.7-98.3%). This might be caused by the complexity of the matrix, i.e., the cations, anions and other organic pollutants co-existed in the solutions may compete the adsorption sites [38]. Nevertheless, the adsorption performance of the AMBC was still considerable for industrial application.…”

Section: Stability and Regeneration Of The Ambcmentioning

confidence: 99%

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Magnetic biochar from alkali-activated rice straw for removal of rhodamine B from aqueous solution

Ren

Chen

Wang

et al. 2019

Environmental Engineering Research

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To address organic dye wastewater, economic and effective adsorbents are required. Here, magnetic biochar from alkali-activated rice straw (AMBC) was successfully synthesized using one-step magnetization and carbonization method. The alkaline activation caused the large specific surface area, high pore volume and abundant oxygen-containing groups of the AMBC, and the magnetization gave the AMBC a certain degree of electropositivity and fast equilibrium characteristics. These characteristics collectively contributed to a relative high adsorption capacity of 53.66 mg g<sup>−1</sup> for this adsorbent towards rhodamine B (RhB). In brief, RhB can spontaneously adsorb onto the heterogeneous surface of the AMBC and reach the equilibrium in 60 min. Although the initial pH, ionic strength and other substances of the solution affected the adsorption performance of the AMBC, it could be easily regenerated and reused with considerable adsorption content. Based on the results, H-bonds, π–π stacking and electrostatic interactions were speculated as the primary mechanisms for RhB adsorption onto the AMBC, which was also demonstrated by the FTIR analysis. With the advantageous features of low cost, easy separation, considerable adsorption capacity and favorable stability and reusability, the AMBC would be a potential adsorbent for removing organic dyes from wastewater.

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Section: Rhb Adsorption Isothermssupporting

confidence: 71%

Section: Stability and Regeneration Of The Ambcmentioning

confidence: 99%

Magnetic biochar from alkali-activated rice straw for removal of rhodamine B from aqueous solution

Ren

Chen

Wang

et al. 2019

Environmental Engineering Research

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“…The peak nearest the 531 cm −1 is frequently accompanied to the lattice vibrations of O-M-O and M-O (where M is a metal) 36 . In comparison with WFS, new peak at 1348 cm −1 was observed in the composite sorbent, which can be ascribed to the asymmetric stretch absorption band and the in-of-plane vibration band of the CO 3 −2 54,55 , which suggests the successful modification of the coated sand foundry waste. After adsorption of the dye, the obtained sample displayed two evidence peaks at approximately 1080 and 1159 cm -1 , which identical to the vibrations of the S = O and the aromatic ring of Congo red molecules, respectively 56 .…”

Section: Resultsmentioning

confidence: 89%

Waste foundry sand/MgFe-layered double hydroxides composite material for efficient removal of Congo red dye from aqueous solution

Ahmed

Naji

Faisal

et al. 2020

Sci Rep

126

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We aimed to obtain magnesium/iron (Mg/fe)-layered double hydroxides (LDHs) nanoparticlesimmobilized on waste foundry sand-a byproduct of the metal casting industry. XRD and ft-iR tests were applied to characterize the prepared sorbent. The results revealed that a new peak reflected LDHs nanoparticles. In addition, SEM-EDS mapping confirmed that the coating process was appropriate. Sorption tests for the interaction of this sorbent with an aqueous solution contaminated with congo red dye revealed the efficacy of this material where the maximum adsorption capacity reached approximately 9127.08 mg/g. The pseudo-first-order and pseudo-second-order kinetic models helped to describe the sorption measurements, indicating that the physical and chemical forces governed the removal process. The severity of water pollution has been resulted from the economic development adopted by human overall the world. The different industries such as textile, plastic, coating, and paper utilize the "dyes" in the different manufacturing stages 1-3 These compounds, even at extremely low concentrations can cause a significant contamination and, consequently, the destroying of the ecosystem elements 4-6. The continuous discharge of water contaminated with poisonous dyes to the environment can be formed a potential threat to the aquatic life and human health especially that the dyes are intrinsically toxic 7,8. Therefore, economical and highly efficient techniques need to be developed for treatment of the contaminated water 9-11. The presently available techniques include photocatalysis 12 , biodegradation 13 , chemical coagulation 14 , ion exchange 15-17 , and adsorption 18-22. The adsorption is one of the most valuable methods in the treatment of the aqueous solutions because of its high efficiency, ease of operation, low cost of operation, and easy desorption 23-25. The selection or fabrication of the adsorbents is the main operative point of adsorption, where these materials must be highly stable, low cost, environment-friendly, and definitely efficient 26,27. Until date, literatures have been reported different reactive materials containing activated carbon, zeolite, clay, chitosan, montmorillonite, and vermiculite 7. However, several disadvantages of these materials include the high cost, poor adsorption capacity, and low reuse rate, which limits their usage 28,29. Thus, finding more efficient, longer durability and low cost new adsorbents are a difficult but a vital task. Layered double hydroxide (LDH) is a type of layered anionic compound that is joined via a non-covalent bond-an interaction between non-framework interlayer anions and positively charged main lamellar. Its general formula is [M +2 1-x M +3 × (OH) 2 ] x + [An − x/n •mH 2 O] x − , where, M +3 is a trivalent metal ion such as Fe +3 , Cr +3 , Sc +3 , and Al +3 ; M +2 is divalent metal ions such as Mn +2 , Mg +2 , Ni +2 , and Zn +2 ; An − is an anion that balances the interlayer charge such as Cl − , OH − , NO 3 − , and CO 3 −2 ; x is the ratio of M +3 / (M +3 + M +2), var...

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“…Combining MgFe-LDH and biochar, the composite material has excellent absorption capacity and cyclic utilization. The maximum absorption capacity of Pb 2+ is 476 mg/g [108].…”

Section: Loading Ldh On Substratesmentioning

confidence: 99%

Functionalized layered double hydroxide applied to heavy metal ions absorption: A review

Tang

Qiu

Lü

et al. 2020

Nanotechnology Reviews

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The use of functional material can help mitigate the pollution by heavy metals, which presents an array of risks to human production and life. This work provides a comprehensive review of the current knowledge on functionalized layered double hydroxide (LDH) as a heavy metal absorption material, by synthesizing the information from a total of 141 relevant publications published since 2005. LDH provides a potentially highly efficient method to adsorb heavy metal ions, which is simple to prepare and of low cost. The lack of functional groups and structural components of pristine LDH, however, limits the absorption capacity and widespread applications of LDH. Through intercalation, surface modification, or loading on substrates, functional groups or structural components are introduced into the pristine LDH to prepare functionalized LDH. In this process, the hydroxyl group and the valence state of [Mg(OH)6] octahedrons play a crucial role. Functionalized LDH can be endowed with selective absorption capacity and enhanced stability and recyclability. After adsorbing heavy metal ions, functionalized LDH can be readily separated from the liquid phase. These aspects are discussed, along with the structure and composition, shape and size, and synthesis methods and research tools of LDH. This work concludes with the discussion of preparation and utilization and a look to the future in terms of identified research needs regarding the preparation, use, and recycling (or upcycling) of economical and environmental-friendly LDH.

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A novel magnetic biochar/MgFe-layered double hydroxides composite removing Pb2+ from aqueous solution: Isotherms, kinetics and thermodynamics

Cited by 164 publications

References 46 publications

Magnetic biochar from alkali-activated rice straw for removal of rhodamine B from aqueous solution

Magnetic biochar from alkali-activated rice straw for removal of rhodamine B from aqueous solution

Waste foundry sand/MgFe-layered double hydroxides composite material for efficient removal of Congo red dye from aqueous solution

Functionalized layered double hydroxide applied to heavy metal ions absorption: A review

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