Removal of chromium (VI) from water using adsorbent derived from spent coffee grounds

Mohan, G. Krishna; Babu, A. Naga; Kalpana, K.; Ravindhranath, K.

doi:10.1007/s13762-017-1593-7

Cited by 45 publications

(12 citation statements)

References 11 publications

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“…Further, the thermodynamic properties, viz. change in Entropy (∆ S ), change in enthalpy (∆ H ), and free energy change (∆ G ), are evaluated from the analysis using the Equations ()–() and are presented in Table (Krishna Mohan, Naga Babu, Kalpana, & Ravindhranath, ; Smith, Ness, & Abott, ).

Δ G = Δ H - T Δ S

Δ G = - R T \ln K_{d}

\ln K_{d} = Δ S / R - Δ H / R T

K_{d} = q_{e} / C_{e}

where q e is the adsorbed quantity of Al(III) and fluoride ions onto the adsorbent surface, C e is the Al(III) and fluoride ions equilibrium concentrations in ml, R is the gas constant, K d is the distribution coefficient, and T is the thermodynamic temperature.…”

Section: Resultsmentioning

confidence: 99%

Sequential synergetic sorption analysis of Gracilaria Rhodophyta biochar toward aluminum and fluoride: A statistical optimization approach

Babu

Reddy

Govindarajan

et al. 2020

Water Environment Research

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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. © 2019 Water Environment Federation • 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.

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Δ G = Δ H - T Δ S

Δ G = - R T \ln K_{d}

\ln K_{d} = Δ S / R - Δ H / R T

K_{d} = q_{e} / C_{e}

Section: Resultsmentioning

confidence: 99%

Sequential synergetic sorption analysis of Gracilaria Rhodophyta biochar toward aluminum and fluoride: A statistical optimization approach

Babu

Reddy

Govindarajan

et al. 2020

Water Environment Research

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“…6a) revealed formation of pores having unevenly-distributed particle size and shape with high deposition of magnetite on the adsorbent surface before Cd(II) adsorption. These are special features that would enhance easy solutes adsorption and percolation onto active pores on adsorbent surface (Krishna Mohan et al., 2017). Similar studies have also obtained similar SEM image of nano-magnetic adsorbent before adsorption (Giri et al., 2011; Wannahari et al., 2018).…”

Section: Resultsmentioning

confidence: 99%

Nano-magnetic walnut shell-rice husk for Cd(II) sorption: design and optimization using artificial intelligence and design expert

Popoola

2019

Heliyon

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This study attempted to investigate the use of nanomagnetic activated carbon prepared from walnut shell and rice husk wastes for removal of Cd(II) from aqueous solution via application of ANN and design expert as adsorbent preparation design and optimization tools. The novel adsorbent was characterized using SEM, FTIR, EDS and BET. The result from 2-level factorial design expert revealed 78.58% Cd(II) sorption efficiency could be achieved for adsorbent prepared at optimum calcination temperature, calcination time, SS-RH mixing ratio and magnetite loading of 859.20 °C, 2.32 h, 2.54 and 5.56 wt% respectively. Sensitivity analysis by both proposed methodologies revealed calcination temperature as most influential factor in adsorbent preparation. Average relative errors and R 2 values of 1.2931% and 4.806%; and 0.9967 and 0.9055 obtained respectively for developed ANN model with 4-9-1 architecture and 2-level factorial design expert revealed ANN model as better prediction and optimization tool for Cd(II) sorption using NM-WS-RH-AC. Laboratory analysis revealed presence of –OH, –NH and COO − groups on adsorbent surface; presence of Cd(II) after adsorption; change in adsorbent textural and morphological structure after Cd(II) adsorption; and increase in its surface area and average pore diameter due to magnetization. Average relatively stable desorption strength of 62.74% towards Cd(II) was exhibited by adsorbent for four consecutive cycles using 0.1M HNO 3 . Prepared adsorbent is effective in removing Cd(II) from solution than commercial activated carbon with economically viable regeneration attribute.

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“…188 Some adsorbents recently reported in the literature are waste materials which are regarded as low-cost sorbents. Typical examples include eggshell powder, 189 orange peels, 190 coffee ground and mixed waste tea, [191][192][193] human hair waste 194 as well as rock wool. 4 The application of these adsorbents in water purication is advantageous in green chemistry perspectives as these are prevented from invading the environment.…”

Section: Most Recent Applications Challenges and Future Perspectivesmentioning

confidence: 99%

Recent advances in hexavalent chromium removal from aqueous solutions by adsorptive methods

2019

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Removal of chromium (VI) from water using adsorbent derived from spent coffee grounds

Cited by 45 publications

References 11 publications

Sequential synergetic sorption analysis of Gracilaria Rhodophyta biochar toward aluminum and fluoride: A statistical optimization approach

Sequential synergetic sorption analysis of Gracilaria Rhodophyta biochar toward aluminum and fluoride: A statistical optimization approach

Nano-magnetic walnut shell-rice husk for Cd(II) sorption: design and optimization using artificial intelligence and design expert

Recent advances in hexavalent chromium removal from aqueous solutions by adsorptive methods

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