As(III) and As(V) removal mechanisms by Fe-modified biochar characterized using synchrotron-based X-ray absorption spectroscopy and confocal micro-X-ray fluorescence imaging

Xu, Yong; Xie, Xianjun; Feng, Yujie; Ashraf, Muhammad Aqeel; Liu, Yingying; Su, Chunli; Qian, Kun; Liu, Peng

doi:10.1016/j.biortech.2020.122978

Cited by 51 publications

(16 citation statements)

References 47 publications

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“…This suggests that the 5BC-Fe@B500 with a 5:1 modifier mass ratio achieved a larger Cr(VI) removal rate, which was consistent with the results in Figure 2 b. 27 …”

Section: Resultssupporting

confidence: 87%

“…This suggests that the 5BC-Fe@B500 with a 5:1 modifier mass ratio achieved a larger Cr(VI) removal rate, which was consistent with the results in Figure 2b. 27 Adsorption isotherms of Cr(VI) onto 1BC-Fe@B500, 5BC-Fe@B500, and 10BC-Fe@B500 are shown in Figure 2c. The Langmuir, Freundlich, and Temkin models were applied to fit the isotherm data, and the model parameters are shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Synthesis Methods on the High-Efficiency Removal of Cr(VI) from Aqueous Solution by Fe-Modified Magnetic Biochars

Jian

Feng

et al. 2020

ACS Omega

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Fe-modified biochars have been widely used in removal of Cr(VI) from water due to the resulting modified surface functional groups and magnetization property. However, few studies have synthetically investigated modification methods and synthesis parameters on the improvement of the removal efficiency of Cr(VI) by Fe-modified biochars. Herein, 10 types of corn straw-based magnetic biochars were produced using pre-modification and post-modification methods with various modifier ratios, and the highest heating temperature (HHT). Cr(VI) removal results suggest that the removal efficiency of pre-modified biochars ranged from 50.7 to 98.6%, which was much higher than that of post-modified (6.6–21.6%) and unmodified biochars (0.4–7.6%). The effect of synthesis methods on Cr(VI) adsorption was in the following order: Fe-modification method > modifier ratio > HHT. The adsorption kinetics and isotherm results of three types of pre-modified biochars were well fitted with the pseudo-second-order model (R 2 > 0.99) and the Langmuir adsorption model (R 2 > 0.99), respectively, indicating the surface homogeneity of the pre-modified biochars and unilayer chemisorptions of Cr(VI). Characterization results show that iron oxides or zerovalent iron particles were successfully deposited onto the surface of biochars and magnetism was introduced. A good Pearson correlation (r = −0.9694) between the removal efficiency and pH value in modified biochar suggests that the lower pH value may offer more positive charges and promote electrostatic attraction. Therefore, the dominant mechanism for enhanced Cr(VI) adsorption on pre-modified biochar was electrostatic attraction, resulting from its distinguished acidity nature. Our findings provide new insights into the high-efficiency removal of Cr(VI) onto Fe-modified magnetic biochars and will benefit future design of more efficient magnetic biochars.

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“…This suggests that the 5BC-Fe@B500 with a 5:1 modifier mass ratio achieved a larger Cr(VI) removal rate, which was consistent with the results in Figure 2 b. 27 …”

Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Influence of Synthesis Methods on the High-Efficiency Removal of Cr(VI) from Aqueous Solution by Fe-Modified Magnetic Biochars

Jian

Feng

et al. 2020

ACS Omega

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“…Preliminary screening of the As(V) removal rates for the DPL and the raw biochars after 120 min showed that BC-300 was not effective in removing As(V), whereas BC-500 and BC-800 demonstrated the ability to adsorb As(V) by 15% and 22%, respectively. This can be expected due to greater porous structure formed in biochar produced at higher temperatures, as reviewed by other similar research studies [57]. Therefore, these biochars were then selected for further characterization work by conducting the proximate analysis, while BC-300 was not used due to the low adsorption performance.…”

Section: Biochar Characterizationmentioning

confidence: 99%

Adsorption of Arsenic on Fe-Modified Biochar and Monitoring Using Spectral Induced Polarization

Kirmizakis

Tawabini

Siddiq

et al. 2022

Water

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This work demonstrates the potential of Fe-modified biochar for the treatment of arsenic (As) simulated wastewater and the monitoring of adsorption in real-time. Specifically, we propose the utilization of date-palm leaves for the production of biochar, further modified with Fe in order to improve its adsorption function against inorganic pollutants, such as As. Both the original biochar and the Fe-modified biochar were used for adsorption of As in laboratory batch and column experiments. The monitoring of the biochar(s) performance and As treatment was also enhanced by using the spectral induced polarization (SIP) method, offering real-time monitoring, in addition to standard chemical monitoring. Both the original and the Fe-modified biochar achieved high removal rates with Fe-modified biochar achieving up to 98% removal of As compared to the 17% by sand only (control). In addition, a correlation was found between post-adsorption measurements and SIP measurements.

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“…However, this peak was attenuated in BCFM, BCF and BCM adsorbents suggesting successful loading of the oxides into the biochar [26]. Another shoulder peak at 1,630 cm -1 was seen in the BC sample which indicated deformation of water molecule indicating physisorption of water [36]. Peak at 1,730 cm -1 in the BC adsorbent was attributed to the presence of non-ionic esters or carboxylic acid groups (-COOCH 3 /-COOH) [20].…”

Section: Adsorbent Characterizationsmentioning

confidence: 98%

Batch and continuous reactor studies for the adsorption of As(III) from wastewater using a hybrid biochar loaded with transition metal oxides: Kinetics and mass transfer analysis

Gupta

Giri

Rene

et al. 2020

Environmental Engineering Research

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As(III) presence in low concentration (1-5 mg/L) in water presents a challenging problem in its removal. In the present study, biochar prepared by pyrolysis of mustard cake and loaded with Fe-Mn binary oxides through hydrothermal technique was used for adsorptive removal of As(III) from water in batch and continuous mode. The synthesised biochar exhibited mesoporous structures in the range of 2-50 nm (based on BET analysis). The maximum adsorption capacity (95.7 mg/g) obtained using biochar loaded with both Fe-Mn oxides was found to be 1.4 times higher than that of pristine biochar. The adsorption equilibria was best described by Freundlich isotherm (based on R 2 and χ 2) suggesting that the As(III) adsorption was multilayered. The external mass transfer coefficients (β L = 10-5 cm 2 /s) were observed to be higher than film (D f = 10-7-10-9 cm 2 /s) and intraparticle (D i = 10-9 cm 2 /s) diffusivities in batch mode. In column studies, Thomas model gave the best correlation coefficient (R 2 > 0.95) and the adsorption was limited by external mass transfer. Kinetic rate constant decreased with increase in initial As(III) concentration and flow rate. The oxide loaded biochar exhibited reusability up to three times for As(III) removal.

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As(III) and As(V) removal mechanisms by Fe-modified biochar characterized using synchrotron-based X-ray absorption spectroscopy and confocal micro-X-ray fluorescence imaging

Cited by 51 publications

References 47 publications

Influence of Synthesis Methods on the High-Efficiency Removal of Cr(VI) from Aqueous Solution by Fe-Modified Magnetic Biochars

Influence of Synthesis Methods on the High-Efficiency Removal of Cr(VI) from Aqueous Solution by Fe-Modified Magnetic Biochars

Adsorption of Arsenic on Fe-Modified Biochar and Monitoring Using Spectral Induced Polarization

Batch and continuous reactor studies for the adsorption of As(III) from wastewater using a hybrid biochar loaded with transition metal oxides: Kinetics and mass transfer analysis

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