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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.
Senthilkumar, R; Reddy Prasad, D M; Govindarajan, L; Saravanakumar, K; Naveen Prasad, B S.
Afiliação
  • Senthilkumar R; Department of Engineering, College of Applied Sciences, Sohar, Sultanate of Oman.
  • Reddy Prasad DM; Petroleum and Chemical Engineering Programme Area, Faculty of Engineering, Universiti Teknologi Brunei, Gadong, Brunei Darussalam.
  • Govindarajan L; Department of Engineering, College of Applied Sciences, Sohar, Sultanate of Oman.
  • Saravanakumar K; Department of Engineering, College of Applied Sciences, Sohar, Sultanate of Oman.
  • Naveen Prasad BS; Chemical Section, Salalah College of Technology, Salalah, Sultanate of Oman.
Int J Phytoremediation ; 22(3): 279-286, 2020.
Article em En | MEDLINE | ID: mdl-31475570
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%.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Arsênio / Poluentes Químicos da Água / Purificação da Água Idioma: En Ano de publicação: 2020 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Arsênio / Poluentes Químicos da Água / Purificação da Água Idioma: En Ano de publicação: 2020 Tipo de documento: Article