Effect of biochar modified with magnetite nanoparticles and HNO3 for efficient removal of Cr(VI) from contaminated water: A batch and column scale study

Imran, Muhammad; Khan, Zia Ul Haq; Iqbal, Majid; Iqbal, Jibran; Shah, Noor S.; Munawar, Saba; Ali, Shafaqat; Murtaza, Behzad; Naeem, Muhammad Asif; Rizwan, Muhammad

doi:10.1016/j.envpol.2020.114231

Cited by 115 publications

(39 citation statements)

References 67 publications

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“…The peak at around 1600 cm –1 was assigned to C=C stretching vibrations, 34 and the peak at 1375 cm –1 was attributed to phenolic O-H bending, and the signal at 1100–1020 cm –1 can be ascribed to overlapping P–O and C–O peaks. 1 , 34 Peaks between 700 and 900 cm –1 were associated with aromatic out-of-plane C–H bending vibrations. 35 Also, the peaks at 880, 670, and 578 cm –1 were indicative of Fe-OH.…”

Section: Resultsmentioning

confidence: 99%

“…Cr(VI) is 500 times larger toxic to living organisms than Cr(III). 1 Cr(VI)-containing wastewater is discharged from general industrial processes, such as metal processing, pigments, manufactures of chromium salt, electroplating, catalysis, magnetic tapes, and leather tanning, etc. 2 Therefore, it is important to realize the removal and control of Cr(VI) from wastewater.…”

Section: Introductionmentioning

confidence: 99%

“… 3 Of these methods, the adsorption method is easy, economic, and efficient. 1 , 4 However, there is a lack of multifunctional adsorbents with sufficient adsorption capacity and easy separation for further Cr(VI) adsorption. 5 …”

Section: Introductionmentioning

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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Fan et al (2016) prepared biochar of municipal sewage sludge and tea waste through co-pyrolysis for the adsorption of methylene blue from kinetics, isotherm, thermodynamic and mechanism. Imran et al (2020) studied effect of biochar modified with magnetite nanoparticles and HNO 3 for efficient removal of Cr(VI). The results showed that this novel biochar is applicable with excellent reusability and stability under acidic conditions for the practical treatment of Cr (VI) contaminated water.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Co(II) from aqueous solution using municipal sludge biochar modified by HNO3

Hu¹,

Zhang²,

Chen³

et al. 2021

Water Science and Technology

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Herein adsorption studies were proposed on a carboxylated sludge biochar (CSB) material modified by HNO3 to assess its capacity in the removal of cobalt from aqueous solution. The as-prepared sludge biochar material were characterized by Brunaure-Emmett-Teller (BET), Fourier transform infrared (FT-IR), Thermogravimetric analysis (TGA), Energy-dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The isotherm process could be well described by Langmuir isotherm model. The adsorption kinetics indicated that cobalt adsorption followed pseudo-second-order kinetic model. The mechanism between Co(II) and biochar involved electrostatic interaction, ion exchange, surface complexation and physical function. The adsorption capacity on CSB was as high as 72.27 mg·g−1, surpassing original sludge biochar (SB). This is due to the fact that CSB had abundant oxygen-containing functional groups and many hydroxyls, as well as, the BET surface areas increased when SB was modified by HNO3, which stimulate adsorption effect. Therefore, this work shows that CSB could be used as an efficient adsorbent to remove Co(II) in the wastewater.

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“…Many types of adsorbents have been used in adsorption methods, such as activated carbon, 17 agricultural waste, 18 clay, 19 alginic acid nanohydrogel, 20 and biosorbent 21 . These adsorbents have selective adsorption characteristics and have certain effects on the treatment of wastewater containing heavy metal ions 22‐25 …”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cr(VI) onto a low‐cost ceramsite: Preparation, kinetics, and thermodynamics

Zhao

et al. 2021

Int J Applied Ceramic Tech

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A novel composite ceramsite derived from bamboo powders and bentonite was developed as adsorbents for waste water treatment. The microstructure, morphology, and thermal properties of ceramsite were characterized by X‐ray powder diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X‐ray fluorescence, and differential thermal analysis. The effect of compositions, sintering temperatures, sintering time, pH, and adsorption time on the adsorption performance of the ceramsites were studied. The results revealed that the maximum Cr(VI) removal rate of 99% can be obtained in the ceramsite with weight ratio bamboo to bentonite of 6:4, the annealing temperature of 1000°C, the solution pH 1 and contact time of 12 h. The adsorption kinetics and adsorption isotherm analysis revealed that the adsorption process best followed pseudo‐second‐order reaction kinetics and the Freundlich adsorption isotherm. The adsorption mechanism was discussed and both chemisorption and physiosorption were proposed as adsorption mechanism of Cr(VI). Moreover, the thermodynamic parameters, including changes in Gibbs free energy, entropy, and enthalpy, were studied in detail. The bamboo powder/bentonite composite ceramsite developed in this work is a promising candidate as an effective and economical adsorbent for Cr(VI) ions removal.

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Effect of biochar modified with magnetite nanoparticles and HNO3 for efficient removal of Cr(VI) from contaminated water: A batch and column scale study

Cited by 115 publications

References 67 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 Co(II) from aqueous solution using municipal sludge biochar modified by HNO3

Adsorption of Cr(VI) onto a low‐cost ceramsite: Preparation, kinetics, and thermodynamics

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