Latest trends in heavy metal removal from wastewater by biochar based sorbents

Gupta, Sarthak; Sireesha, Sadamanti; Sreedhar, I.; Patel, Chintan; Anitha, K.

doi:10.1016/j.jwpe.2020.101561

Cited by 171 publications

(72 citation statements)

References 196 publications

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“…Generally, a higher TC concentration provides a stronger driving force for the adsorption reaction. Therefore, the adsorption capacity increases with increasing TC concentration, which agrees with Le Chatelier's principle (Leng et al, 2015;Gupta et al, 2020).…”

Section: Effect Of Tc Concentrationsupporting

confidence: 81%

Combining Oxidative Torrefaction and Pyrolysis of Phragmites australis: Improvement of the Adsorption Capacity of Biochar for Tetracycline

Jiang¹,

Tan²,

Huang³

et al. 2021

Front. Energy Res.

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Section: Effect Of Tc Concentrationsupporting

confidence: 81%

Combining Oxidative Torrefaction and Pyrolysis of Phragmites australis: Improvement of the Adsorption Capacity of Biochar for Tetracycline

Jiang¹,

Tan²,

Huang³

et al. 2021

Front. Energy Res.

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“…Biochar is typically rich in functional groups such as hydroxyl, carboxyl, carbonyl, and methylene on the surfaces of the pore system [40]. Biochar has a large surface area and strong adsorption efficiency that makes it attractive for the removal of heavy metals from wastewater [41]. Surface modification is categorized into activation and formation of composite [42].…”

Section: Introductionmentioning

confidence: 99%

Pristine and Magnetic Kenaf Fiber Biochar for Cd2+ Adsorption from Aqueous Solution

Saeed

Harun

Sufian

et al. 2021

IJERPH

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Development of strategies for removing heavy metals from aquatic environments is in high demand. Cadmium is one of the most dangerous metals in the environment, even under extremely low quantities. In this study, kenaf and magnetic biochar composite were prepared for the adsorption of Cd2+. The synthesized biochar was characterized using (a vibrating-sample magnetometer VSM), Scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The adsorption batch study was carried out to investigate the influence of pH, kinetics, isotherm, and thermodynamics on Cd2+ adsorption. The characterization results demonstrated that the biochar contained iron particles that help in improving the textural properties (i.e., surface area and pore volume), increasing the number of oxygen-containing groups, and forming inner-sphere complexes with oxygen-containing groups. The adsorption study results show that optimum adsorption was achieved under pH 5–6. An increase in initial ion concentration and solution temperature resulted in increased adsorption capacity. Surface modification of biochar using iron oxide for imposing magnetic property allowed for easy separation by external magnet and regeneration. The magnetic biochar composite also showed a higher affinity to Cd2+ than the pristine biochar. The adsorption data fit well with the pseudo-second-order and the Langmuir isotherm, with the maximum adsorption capacity of 47.90 mg/g.

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“…According to R 2 and χ 2 in Table 2, the pseudo-second-order kinetic fitted better than first-order kinetic, and the calculated q e (1.29 mg/g) were close to the experimental q e (1.21 mg/g). The pseudo-second-order kinetic linked closely with the formation of chemical bonds (Gupta et al 2020). It took a longer time to achieve equilibrium by S-PSB (120 min) than PSB (60 min), meanwhile P adsorption speed of S-PSB (k 2 : 0.039 g/mg/min) was much slower than that of PSB (k 2 : 0.205 g/mg/min).…”

Section: Enhanced P Adsorption Capacity Of S-psbmentioning

confidence: 99%

Sediment metals adhering to biochar enhanced phosphorus adsorption in sediment capping

Cheng

Fan

Zhang

et al. 2021

Water Science and Technology

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Metal ions in sediment were inherent Ca and Fe sources for biochar modification. In this work, effect of Ca2+ and Fe2+ released from sediment on biochar for phosphorus adsorption was evaluated. Results showed that, raw peanut shell biochar (PSB) was poor in phosphorus adsorption (0.48 mg/g); sediment-triggered biochar (S-PSB) exhibited P adsorption capacity of 1.32 mg/g in capping reactor and maximum adsorption capacity of 10.72 mg/g in Langmuir model. Sediment released Ca2+ of 2.2–4.1 mg/L and Fe2+/Fe3+ of 0.2–9.0 mg/L. The metals loaded onto biochar surface in the forms of Ca-O and Fe-O, with Ca and Fe content of 1.47 and 0.29%, respectively. Sediment metals made point of zero charge (pHpzc) of biochar shifted from 5.39 to 6.46. The mechanisms of enhanced P adsorption by S-PSB were surface complexation of CaHPO4 followed by precipitation of Ca3(PO4)2 and Ca5(PO4)3(OH). Sediment metals induced modification of biochar and improvement of P adsorption, which was feasible to overcome the shortcomings of biochar on phosphorus control in sediment capping.

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Latest trends in heavy metal removal from wastewater by biochar based sorbents

Cited by 171 publications

References 196 publications

Combining Oxidative Torrefaction and Pyrolysis of Phragmites australis: Improvement of the Adsorption Capacity of Biochar for Tetracycline

Combining Oxidative Torrefaction and Pyrolysis of Phragmites australis: Improvement of the Adsorption Capacity of Biochar for Tetracycline

Pristine and Magnetic Kenaf Fiber Biochar for Cd2+ Adsorption from Aqueous Solution

Sediment metals adhering to biochar enhanced phosphorus adsorption in sediment capping

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