Magnetic spent bleaching earth carbon (Mag-SBE@C) for efficient adsorption of tetracycline hydrochloride: Response surface methodology for optimization and mechanism of action

Liu, Yongde; Li, Jinsong; Wu, Lairong; Shi, Yahui; He, Qiaochong; Chen, Jing; Wan, Dongjin

doi:10.1016/j.scitotenv.2020.137817

Cited by 49 publications

(24 citation statements)

References 40 publications

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“…After the adsorption of nitrate or nitrite, new peaks were observed at 1,384 cm À1 and 1,271 cm À1 , corresponding to nitrate and nitrite (Ogata et al 2018), indicating the successful adsorption of nitrate and nitrite on M-CHT. Moreover, for all samples, the peak at 582 cm À1 corresponded to the Fe-O stretching vibration (Liu et al 2020b(Liu et al , 2021b, which…”

Section: Ftir Analysismentioning

confidence: 92%

Adsorption of nitrate and nitrite from aqueous solution by magnetic Mg/Fe hydrotalcite

Chen

Wei

et al. 2021

Water Supply

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In this study, magnetic Mg/Fe hydrotalcite calcined material (M-CHT) was synthesized through co-precipitation and calcination method, and was used to effectively remove nitrate and nitrite from water. M-CHT can restore its original layered structure after the adsorption of nitrate or nitrite, and can be easily separated by the applied magnetic field. The first-order and pseudo-second-order kinetic models (R2 ≥ 0.97) can better describe the adsorption kinetic process. The equilibrium isotherm showed that the Langmuir model provided a better fit to the experimental data than the Freundlich model for nitrates and nitrites. With temperature increased from 298 to 308 K, the maximum adsorption capacity obtained by the Langmuir model increased from 10.60 to 16.90 mg-N/g for nitrate and 7.89 to 14.28 mg-N/g for nitrite, respectively. The adverse effect of coexisting anions ranked in the order of ClO4− > Cl− > SO42− > F− > CO32− > PO43−. The actual Fe2+/Fe3+ value of M-CHT (0.56) is nearly consistent with the theoretical value of 0.5, and the saturation magnetic strength value of M-CHT is 9.15 emu/g, greatly contributing to the solid-liquid separation. Overall, M-CHT with features of magnetic properties and satisfactory adsorption capacity exhibits the greatly promising for application in wastewater purification.

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Section: Ftir Analysismentioning

confidence: 92%

Adsorption of nitrate and nitrite from aqueous solution by magnetic Mg/Fe hydrotalcite

Chen

Wei

et al. 2021

Water Supply

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“…The shapes of the contours can indicate the intensity of interaction between two variables. 30 It is clear that the more elliptical the contours are, the more prominent the interactions are, and vice versa. Therefore, the interactions of temperature−ratio (Figure 4a,b) and temperature−time (Figure 4c,d) were strong.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Porous Catalytic Pyrolysis Char Derived from Oily Sludge for Enhanced Adsorption

Han

Gong³

et al. 2021

ACS Omega

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A novel pyrolysis char (PC), prepared by H 3 PO 4 catalytic pyrolysis of oily sludge (OS), was presented to remove methylene blue (MB) dye from aqueous solution for the first time. The optimal preparation conditions (catalytic pyrolysis temperature of 411 °C, H 3 PO 4 impregnation ratio of 2.44, and catalytic pyrolysis time of 59 min) were predicted by the response surface methodology. The optimal PC exhibited favorable hierarchical porous properties, which brought a large adsorption capability (322.89 mg/g). The adsorption process fitted well with the Langmuir model and pseudo-second order model. In addition, thermodynamic parameters showed that the adsorption process was endothermic (ΔH 0 > 0) and spontaneous (ΔG 0 < 0). The adsorption capability was strongly influenced by coexisting metal ions due to the competitive adsorption effect. The inhibition for MB adsorption was arranged in the following order:

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“…The specific surface area and pore volume of SBE@C were increased by the pyrolysis, which was conducive to improving the adsorption capacity. However, the decrease of the average pore size may be caused by the incomplete carbonization of organic matters under the conditions of high temperature pyrolysis and the blocking of some pore channels 32 …”

Section: Resultsmentioning

confidence: 99%

“…However, the decrease of the average pore size may be caused by the incomplete carbonization of organic matters under the conditions of high temperature pyrolysis and the blocking of some pore channels. 32 Analysis of elements and surface functional groups Table 1 presents the elemental analysis and surface oxygencontaining functional group analysis of SBE and SBE@C by the elemental analyzer and Boehm titration. 33 The element contents of SBE are as follows: C (15.86 wt.%), H (3.01 wt.%), O (12.88 wt.%), and N (0.42 wt.%).…”

Section: Characterization Analysismentioning

confidence: 99%

Insights into lead removal in water using a novel carbonized material derived from the by‐product of oil refining: action mechanism and performance optimization

Wan

Cheng

Shi

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Pollution control by the treatment of waste is a hot issue currently being studied that continues to attract more and more attention. In this work, by using the solid by‐products of oil refining (i.e., spent bleaching earth, SBE) as the raw materials, an environmentally‐friendly adsorbent (i.e., spent bleaching earth carbon, SBE@C) was prepared by the pyrolysis of SBE to adsorb Pb(II) from water. RESULTS Herein, Pb(II) maximum adsorption capacity of SBE@C (63.30 mg g–1) from the Langmuir model is about twice that of SBE (33.13 mg g–1). This is mainly attributed to the increased surface area and surface hydrophobicity of SBE@C after pyrolysis. The adsorption kinetics indicated that the pseudo‐second‐order kinetic model and the Elovich model can better fit the kinetic process of SBE and SBE@C for Pb(II) adsorption, respectively. Coexisting cations cause the decrease of Pb(II) adsorption capacity by SBE@C to varying degrees, and the order of their inhibition is: Na+ < K+ < Mg2+ < Cu2+ < Al3+ < Fe3+. Increasing the initial pH of the solution (2.20–5.75) can promote Pb(II) adsorption capacity of SBE@C. CONCLUSION Based on the results of characterization, Pb(II) adsorption mechanism by SBE@C is proposed, including the surface adsorption, electrostatic attraction, ion exchange, and surface complexation. Meanwhile, SBE@C has an excellent re‐utilization ability, and the adsorption ability of SBE@C was speculated to be lost after nine cycles. Overall, SBE@C is considered an economical and efficient adsorbent with broad application prospects.

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Magnetic spent bleaching earth carbon (Mag-SBE@C) for efficient adsorption of tetracycline hydrochloride: Response surface methodology for optimization and mechanism of action

Cited by 49 publications

References 40 publications

Adsorption of nitrate and nitrite from aqueous solution by magnetic Mg/Fe hydrotalcite

Adsorption of nitrate and nitrite from aqueous solution by magnetic Mg/Fe hydrotalcite

Hierarchical Porous Catalytic Pyrolysis Char Derived from Oily Sludge for Enhanced Adsorption

Insights into lead removal in water using a novel carbonized material derived from the by‐product of oil refining: action mechanism and performance optimization

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