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

The sorption behavior of biochar derived from green seaweed (Ulva reticulata) toward arsenic(V) ions was explored in both batch and continuous modes. The pH edge experiments indicated optimum arsenic(V) sorption observed at pH 4, with maximum sorptional capacity of 7.67 mg/g through isotherm experim...

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Bibliographic Details
Published in:International journal of phytoremediation 2020-02, Vol.22 (3), p.279-286
Main Authors: Senthilkumar, R., Reddy Prasad, D. M., Govindarajan, L., Saravanakumar, K., Naveen Prasad, B. S.
Format: Article
Language:English
Subjects:
Adsorption
Algae
Arsenic
Biochar
Biodegradation, Environmental
Charcoal
Correlation coefficient
Correlation coefficients
Hydrogen-Ion Concentration
Isotherms
Kinetic equations
Kinetics
pH effects
Pollutant removal
Remediation
Seaweeds
Sodium hydroxide
Sorption
sustainability
toxicity
wastewater treatment
Water Pollutants, Chemical
Water Purification
water quality
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Summary:The sorption behavior of biochar derived from green seaweed (Ulva reticulata) toward arsenic(V) ions was explored in both batch and continuous modes. The pH edge experiments indicated optimum arsenic(V) sorption observed at pH 4, with maximum sorptional capacity of 7.67 mg/g through isotherm experiments. The kinetic experimental trials indicated that arsenic(V) sorption onto biochar was a fast electrostatic attraction process, with maximum removal occurred within 30 min. The sorption isotherms were modeled using the Toth, Redlich-Peterson, Langmuir and Freundlich isotherm models while the adsorption kinetics was modeled using the pseudo-first- and pseudo-second-order kinetic equations. The three-parameter models (Redlich-Peterson and Toth) better described the isotherm data, whereas pseudo-first-order model represented kinetic data well with low error and high correlation coefficient values. Among the different alkaline and acidic elutants investigated, the solution of 0.01 M NaOH effectively desorbed arsenic(V) from spent biochar. The feasibility of the biochar in continuous remediation of arsenic(V) from contaminated waters was explored in an up-flow fixed column. The biochar exhibited arsenic(V) removal efficiency and sorptional uptake of 59.5% and 8.12 mg/g, respectively. The biochar-loaded column was effectively desorbed using NaOH (0.01 M), with desorption efficiency of 99.5%.
ISSN:1522-6514
1549-7879
DOI:10.1080/15226514.2019.1658710