Lead (Pb<sup>2+</sup>) sorptive removal using chitosan-modified biochar: batch and fixed-bed studies

Dewage, Narada Bombuwala; Fowler, Robert J.; Pittman, Charles U.; Mohan, Dinesh; Mlsna, Todd

doi:10.1039/c8ra04600j

Cited by 83 publications

(22 citation statements)

References 61 publications

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“…The CGBC has a lower temperature weight loss region (225-270 • C) where chitosan thermally degrades (Hong et al, 2007), followed by a slower loss of chitosan residue up to ∼540 • C. From 540 to 1000 • C, CGBC exhibits more weight loss than GBC due to the continued weight loss from chitosan residues along with the underlying biochar decomposition and the lower ash content of the CGBC. These weight loss changes for GBC and CGBC are comparable to what is found in the literature (Zhou et al, 2013;Dewage et al, 2018).…”

Section: Characterization Of Chitosan Coated Biocharsupporting

confidence: 88%

Cadmium and Copper Removal From Aqueous Solutions Using Chitosan-Coated Gasifier Biochar

Burk

Herath

Crisler

et al. 2020

Front. Environ. Sci.

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Gasifier Biochar (GBC) and Chitosan-Coated Gasifier Biochar (CGBC) derived from pine wood was used to remove Cu2+ and Cd2+ from water. Chitosan-Coated Gasifier Biochar was made by mixing GBC with aqueous acetic acid chitosan solution followed by treatment with NaOH. Both CGBC and GBC were characterized using FT-IR, scanning electron microscopy, surface area measurement (BET), elemental analysis, thermogravimetric analysis, and point of zero charge. Chitosan accounts for 25% of the weight of the CGBC. Thermogravimetric analysis showed chitosan decomposes sharply at 225–270°C and then more slowly thereafter. The BET surface areas of GBC and CGBC were 34.1 and 4.61 m2/g, respectively. Batch adsorption studies performed at pH values of 2–5 followed Cu2+ and Cd2+ adsorption quantitatively using atomic absorption spectrophotometry. Sorption was evaluated using the Freundlich, Langmuir, and Sips isotherm models. Cu2+ adsorption on CGBC fit best the Sips model (capacity 111.5 mg/g) and Cd2+ with the Langmuir model (capacity 85.8 mg/g). Langmuir adsorption capacities on GBC were 83.7 and 68.6 mg/g for Cu2+ and Cd2+ respectively. CGBC removed more Cu2+(25.8 mg/g) and Cd2+(17.2 mg/g) than GBC because chitosan modification generates amine coordination sites that enhance metal adsorption. Adsorption on CGBC and GBC of both metal ions followed pseudo-second order kinetics.

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Section: Characterization Of Chitosan Coated Biocharsupporting

confidence: 88%

Cadmium and Copper Removal From Aqueous Solutions Using Chitosan-Coated Gasifier Biochar

Burk

Herath

Crisler

et al. 2020

Front. Environ. Sci.

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“…As shown in Table 2 and Figure 6, the elimination efficiencies of the emerging micropollutants increased with increasing the pH from 4 to 6, and maximum micropollutant removal occurred at pH 6, whereas at pH 5-6, the net surface charge is positive and ion repulsion still exists [39]. Then, the removal effectiveness decreased from pH 6 to 8.…”

Section: Emerging Micropollutants Removalmentioning

confidence: 89%

Cross-Linked Magnetic Chitosan/Activated Biochar for Removal of Emerging Micropollutants from Water: Optimization by the Artificial Neural Network

Mojiri

Kazeroon

Gholami

2019

Water

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One of the most important types of emerging micropollutants is the pharmaceutical micropollutant. Pharmaceutical micropollutants are usually identified in several environmental compartments, so the removal of pharmaceutical micropollutants is a global concern. This study aimed to remove diclofenac (DCF), ibuprofen (IBP), and naproxen (NPX) from the aqueous solution via cross-linked magnetic chitosan/activated biochar (CMCAB). Two independent factors—pH (4–8) and a concentration of emerging micropollutants (0.5–3 mg/L)—were monitored in this study. Adsorbent dosage (g/L) and adsorption time (h) were fixed at 1.6 and 1.5, respectively, based on the results of preliminary experiments. At a pH of 6.0 and an initial micropollutant (MP) concentration of 2.5 mg/L, 2.41 mg/L (96.4%) of DCF, 2.47 mg/L (98.8%) of IBP, and 2.38 mg/L (95.2%) of NPX were removed. Optimization was done by an artificial neural network (ANN), which proved to be reasonable at optimizing emerging micropollutant elimination by CMCAB as indicated by the high R2 values and reasonable mean square errors (MSE). Adsorption isotherm studies indicated that both Langmuir and Freundlich isotherms were able to explain micropollutant adsorption by CMCAB. Finally, desorption tests proved that cross-linked magnetic chitosan/activated biochar might be employed for at least eight adsorption-desorption cycles.

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“…46,80−82 The column performance can be explained by means of a breakthrough curve. 81−83 Figure S11 shows an ideal breakthrough curve, where C and V e are the fluoride concentrations in the effluent and volume of fluoride free water passing through 1.0 cm 3 of the biochar, respectively. Column breakthrough point was selected at a low effluent concentration, C b and exhaustion point at C x close to C o (influent concentration).…”

Section: Methodsmentioning

confidence: 99%

Simplified Batch and Fixed-Bed Design System for Efficient and Sustainable Fluoride Removal from Water Using Slow Pyrolyzed Okra Stem and Black Gram Straw Biochars

2019

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Okra stem biochar (OSBC) and black gram straw biochar (BGSBC) were prepared by slow pyrolysis at 500 and 600 °C, respectively. OSBC and BGSBC were characterized using SBET, Fourier transform infrared, X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy, SEM–energy dispersive X-ray, and energy dispersive X-ray fluorescence. High carbon contents (dry basis) of 66.2 and 67.3% were recorded in OSBC and BGSBC, respectively. The OSBC surface area (23.52 m2/g) was higher than BGSBC (9.27 m2/g). The developed biochars successfully remediate fluoride contaminated water. Fluoride sorption experiments were accomplished at 25, 35, and 45 °C. Biochar-fluoride adsorption equilibrium data were fitted to Langmuir, Freundlich, Sips, Temkin, Koble–Corrigan, Radke and Prausnitz, Redlich–Peterson, and Toth isotherm models. The sorption dynamic data was better fitted to the pseudo-second order rate equation versus the pseudo-first order rate equation. The Langmuir sorption capacities of QOSBC0 = 20 mg/g and QBGSBC0 = 16 mg/g were obtained. Biochar fixed-bed dynamic studies were accomplished to ascertain the design parameters for developing an efficient and sustainable fluoride water treatment system. A column capacity of 6.0 mg/g for OSBC was achieved. OSBC and BGSBC satisfactorily remediated fluoride from contaminated ground water and may be considered as a sustainable solution for drinking water purification.

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Lead (Pb²⁺) sorptive removal using chitosan-modified biochar: batch and fixed-bed studies

Abstract: Batch and fixed-bed column studies for the removal of lead (Pb2+) from aqueous solution by chitosan-modified pinewood biochar.

Cited by 83 publications

References 61 publications

Cadmium and Copper Removal From Aqueous Solutions Using Chitosan-Coated Gasifier Biochar

Cadmium and Copper Removal From Aqueous Solutions Using Chitosan-Coated Gasifier Biochar

Cross-Linked Magnetic Chitosan/Activated Biochar for Removal of Emerging Micropollutants from Water: Optimization by the Artificial Neural Network

Simplified Batch and Fixed-Bed Design System for Efficient and Sustainable Fluoride Removal from Water Using Slow Pyrolyzed Okra Stem and Black Gram Straw Biochars

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Lead (Pb2+) sorptive removal using chitosan-modified biochar: batch and fixed-bed studies

Abstract: Batch and fixed-bed column studies for the removal of lead (Pb2+) from aqueous solution by chitosan-modified pinewood biochar.

Cited by 83 publications

References 61 publications

Cadmium and Copper Removal From Aqueous Solutions Using Chitosan-Coated Gasifier Biochar

Cadmium and Copper Removal From Aqueous Solutions Using Chitosan-Coated Gasifier Biochar

Cross-Linked Magnetic Chitosan/Activated Biochar for Removal of Emerging Micropollutants from Water: Optimization by the Artificial Neural Network

Simplified Batch and Fixed-Bed Design System for Efficient and Sustainable Fluoride Removal from Water Using Slow Pyrolyzed Okra Stem and Black Gram Straw Biochars

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Lead (Pb²⁺) sorptive removal using chitosan-modified biochar: batch and fixed-bed studies