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Sequential synergetic sorption analysis of Gracilaria Rhodophyta biochar toward aluminum and fluoride: A statistical optimization approach
Author(s) -
Naga Babu Andraju,
Srinivasa Reddy Devarapu,
Suresh Kumar Govindarajan,
Ravindhranath Kunta,
Krishna Mohan Godavarthi Venkata
Publication year - 2020
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/wer.1283
Subject(s) - biochar , sorption , fluoride , adsorption , fourier transform infrared spectroscopy , physisorption , freundlich equation , langmuir adsorption model , langmuir , chemistry , nuclear chemistry , wastewater , aluminium , inorganic chemistry , chemical engineering , environmental engineering , pyrolysis , environmental science , organic chemistry , engineering
The present work proposes the synthesis of robust biochar from Gracilaria Rhodophyta red weeds for sequential removal of Al(III) and fluoride from wastewater. The sorption experiments have been modeled by preliminary optimization of operational parameters using 2 4 factorial statistical modeling. The model has estimated an optimum sequential synergetic removal of 44.5 mg/g of Al(III) and 2.1 mg/g of fluoride onto the biochar. FESEM, BET, XRD, EDX, and FTIR established the potentiality of biochar toward synergetic sorption of Al(III) and fluoride. The thermodynamic analysis projected that the adsorption is physisorption in nature. The adsorption of Al(III) and fluoride follows the Langmuir and Freundlich isotherm models, respectively, and the kinetic analysis established the pseudo‐second‐order deposition of Al(III) and fluoride ions. The synthesized adsorbent is regenerative enough and could achieve synergetic removal of Al(III) and fluoride ions from industrial‐ and groundwater‐contaminated water bodies. Practitioner points Biochar from seaweeds is explored in the sequential removal of Al(III) and F − ions. Statistical model is developed for % adsorption and tested for reliability by ANOVA. GRBC sorbed 44.5 and 2.1 mg/g of Al(III) and F − ions, respectively, at optimum levels. FESEM, EDX, XRD, and FTIR characterization confirm the potentiality of the GRBC. GRBC sorbed ⁓90% of Al(III) and F − ions from wastewater and is regenerative.