Synthesis of green marine algal-based biochar for remediation of arsenic(V) from contaminated waters in batch and column mode of operation

Senthilkumar, R.; Prasad, D. M. Reddy; Govindarajan, Lakshmi Narasimhan; Saravanakumar, K.; Prasad, B. K.

doi:10.1080/15226514.2019.1658710

Cited by 49 publications

(24 citation statements)

References 41 publications

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“…At low pH conditions (pH 4–6), arsenate oxyanion commonly exists as negative HAsO 4 2− and H 2 AsO 4 − species . Hence, relatively elevated arsenate sorption in acidic pH values is due to existence of protonated positively charged binding sites due to saturation of additional H + ions on the surface of TOB; thereby improving the sorption of arsenate through electrostatic interaction . Conversely, decline in arsenate sorption by TOB, essentially under alkaline environments, was due to existence of surplus hydroxyl ions which compete with arsenate oxyanion for TOB surface binding sites …”

Section: Resultsmentioning

confidence: 99%

Batch and Column Arsenate Sorption Using Turbinaria ornata Seaweed Derived Biochar: Experimental Studies and Mathematical Modeling

et al. 2020

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The ability of Turbinaria ornata seaweed derived biochar (TOB) to remove arsenate ions from polluted solutions in batch and column trials has been investigated. The biochar, produced at 300 °C and 120 min through pyrolysis, exhibited maximum arsenate sorption capacity at pH 4. Batch sorption isotherm was described with different models (Freundlich, Langmuir and Sips) and the Sips model best described the experimentally derived isotherm with high correlation coefficient and low percentage error values. The maximum arsenate sorptional capacity calculated using the Langmuir model was estimated to be 0.124 mmol/g (at pH 4; 2 g/L biochar dosage and 0.5 mmol/L initial arsenate concentration). For elution trials, 0.01 M NaOH performed well to desorb arsenate from arsenate‐bounded TOB with elution efficiency greater than 99.6% with no significant damage to TOB. The capability of TOB to sorb arsenate continuously was examined in a packed column. The continuous trials were mainly performed to evaluate the impact of influential column parameters including bed height, initial arsenate concentration and flow rate. The arsenate sorptional capacity declined with improvement in flow rate, whereas enhanced with increment in bed depth and initial arsenate concentration values. Regeneration of exhausted TOB was possible with 0.01 M NaOH. After three sorption‐elution cycles it was determined that TOB exhibited superior sorption capacities and percentage removal efficiencies.

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Section: Resultsmentioning

confidence: 99%

Batch and Column Arsenate Sorption Using Turbinaria ornata Seaweed Derived Biochar: Experimental Studies and Mathematical Modeling

et al. 2020

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“…In Figure 4A, when the initial Cr(VI) concentration was set at 30 and 60 mg/L, the adsorption capacity of Cr(VI) increased slowly as the pH raised from 2.0 to 3.0. The uptake of cationic metal ions by biochar at pH 2.0 was lower than that at pH 3.0 (Senthilkumar et al, 2019). Further enhancement of equilibrium pH negatively influenced the adsorption capacity of MBC-MFC (3.0 < pH < 9.0).…”

Section: Characterization Of Mulberry Stem Biochar Composite and Mulberry Stem Biochar/ Mn-fe Binary Oxide Compositementioning

confidence: 92%

Synthesis, Optical Characterization, and Adsorption of Novel Hexavalent Chromium and Total Chromium Sorbent: A Fabrication of Mulberry Stem Biochar/Mn-Fe Binary Oxide Composite via Response Surface Methodology

Liang

Ding

et al. 2021

Front. Environ. Chem.

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In this study, a new generation chromium sorbent, mulberry stem biochar/Mn-Fe binary oxide composite (MBC-MFC), was fabricated by chemical precipitation on carbonized mulberry stem according to response surface methodology (RSM) results. RSM was more convenient to figure out the optimized preparation condition of MBC-MFC theoretically for achieving a maximum removal efficiency of Cr(VI) and total chromium (TCr), compared to labor-intensive orthogonal experiments. The RSM results showed that Fe/Mn concentration (CFe; CMn), MBC activation temperature after soaking in KOH solution (T), and pH during precipitation of Fe-Mn oxide were three main factors to significantly affect the efficiency of MBC-MFC (p < 0.05) in Cr(VI) and TCr removal. With the selected condition (CFe = 0.28 mol/L; CMn = 0.14 mol/L; T = 790°C; pH = 9.0), MBC-MFC was synthesized with a large surface area (318.53 m2/g), and the point of zero charge values of MBC-MFC was 5.64. The fabricated MBC-MFC showed excellent adsorption performance of Cr(VI) and TCr in an aqueous solution. The maximum Cr(VI) and TCr removal capacity of MBC-MFC was 56.18 and 54.97 mg/g (T = 25°C, pH = 3.0, t = 48 h, and dosage = 0.10 g/50 ml), respectively, and the maximum Cr(VI) adsorption of MBC-MFC was 4.16 times that of bare MBC, suggesting the synergistic effects of Fe/Mn oxides and MB on the performance of MBC-MFC in Cr(VI) and TCr removal. The adsorption mechanism of MBC-MFC on chromium was mainly contributed by surface complexation and electrostatic attraction. Our study offers valuable outlooks to develop high-performance biochar-based sorbents for heavy metal removal and sustainable environmental remediation.

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“…The common date seeds ( Phoenyx dactylifera ) acquired from local markets were separated from date fruits, followed by washing with DI (deionized water) and then dried in an oven at 100°C for 12 h. Dried seeds (100 g) were then placed in a crucible shielded with aluminum foils with two small vents. The sample was then heated in a muffle electrical furnace at 350°C for a period of 2 h 24 . The muffle electrical furnace was initially purged with nitrogen gas to make a low‐oxygen environment.…”

Section: Methodsmentioning

confidence: 99%

“…About 100 ml solution of each metal with known concentrations and 0.2 g of DSDB were contacted in a 250 ml Erlenmeyer flask. The suspension was then agitated in an incubated shaker for a period of 8 h at a fixed rate of 180 rpm and temperature of 30 ± 1°C 24 . Once the process was completed and the suspension attained equilibrium, the samples were centrifuged for 15 min at a speed of 2100 rpm.…”

Section: Methodsmentioning

confidence: 99%

Single and competitive sorption potential of date seed‐derived biochar during removal of lead (II) and cadmium (II) ions

Saravanakumar

Prasad²,

Senthilkumar

et al. 2021

Env Prog and Sustain Energy

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The current research was performed to examine the effects of date seed‐derived biochar (DSDB) for remediation of hazardous metal ions (lead (II) and cadmium (II)) from binary and single systems. The maximum sorption uptakes of 0.484 and 0.798 mmol/g were recorded for lead (II) and cadmium (II) ions, respectively, at an equilibrium pH of 4.5. For both metal ions, DSDB produced quick kinetic uptake rates with most of the removal process (90%) completed within 60 mins. Different types of models were applied to depict lead (II) and cadmium (II) isotherms (Toth, Redlich–Peterson, Freundlich, and Langmuir) and kinetics (pseudo‐first and ‐second order) data. Desorption method was attempted and DSDB was reutilized in five consecutive cycles successfully using 0.01 M HCl as elutant. During binary sorption, decreased uptake of cadmium (II) by DSDB was observed due to the presence of lead (II). In comparison to single solute system, the uptake of cadmium (II) was reduced to 26.5% while only 1.2% reduction for lead (II) was observed. While comparing the two multi‐component isotherm models (Langmuir and Freundlich), the multicomponent Langmuir model performed well in describing the cadmium (II)+lead (II) binary isotherm with high accuracy.

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Synthesis of green marine algal-based biochar for remediation of arsenic(V) from contaminated waters in batch and column mode of operation

Cited by 49 publications

References 41 publications

Batch and Column Arsenate Sorption Using Turbinaria ornata Seaweed Derived Biochar: Experimental Studies and Mathematical Modeling

Batch and Column Arsenate Sorption Using Turbinaria ornata Seaweed Derived Biochar: Experimental Studies and Mathematical Modeling

Synthesis, Optical Characterization, and Adsorption of Novel Hexavalent Chromium and Total Chromium Sorbent: A Fabrication of Mulberry Stem Biochar/Mn-Fe Binary Oxide Composite via Response Surface Methodology

Single and competitive sorption potential of date seed‐derived biochar during removal of lead (II) and cadmium (II) ions

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