Removal of Cr(VI) from synthetic wastewater by adsorption onto coffee ground and mixed waste tea

Cherdchoo, Wachiraphorn; Nithettham, Srisuda; Charoenpanich, Jittima

doi:10.1016/j.chemosphere.2019.01.100

Cited by 158 publications

(60 citation statements)

References 54 publications

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“…When the pH exceeded 7.0, chromate (CrO 4 2− ) was the main Cr(VI) species [33,37]. The initial pH of the solution simultaneously affects the adsorbent surface charge and degree of ionization [44]. At lower pH, the functional groups on the surface of the SLACM were protonated by plentiful hydrogen ions, and there was a strong electrostatic interaction between the negatively charged Cr(VI) and the positively charged SLACM.…”

Section: Effect Of Initial Ph On Adsorptionmentioning

confidence: 99%

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Activated Carbon Microsphere from Sodium Lignosulfonate for Cr(VI) Adsorption Evaluation in Wastewater Treatment

Yang

Xing

et al. 2020

Polymers

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In this study, activated carbon microsphere (SLACM) was prepared from powdered sodium lignosulfonate (SL) and polystyrene by the Mannich reaction and ZnCl2 activation, which can be used to remove Cr(VI) from the aqueous solution without adding any binder. The SLACM was characterized and the batch experiments were conducted under different initial pH values, initial concentrations, contact time durations and temperatures to investigate the adsorption performance of Cr(VI) onto SLACM. The results indicated that the SLACM surface area and average pore size were 769.37 m2/g and 2.46 nm (the mesoporous material), respectively. It was found that the reduced initial pH value, the increased temperature and initial Cr(VI) concentration were beneficial to Cr(VI) adsorption. The maximum adsorption capacity of Cr(VI) on SLACM was 227.7 mg/g at an initial pH value of 2 and the temperature of 40 °C. The adsorption of SLACM for Cr(VI) mainly occurred during the initial stages of the adsorption process. The adsorption kinetic and isotherm experimental data were thoroughly described by Elovich and Langmuir models, respectively. SL could be considered as a potential raw material for the production of activated carbon, which had a considerable potential for the Cr(VI) removal from wastewater.

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Section: Effect Of Initial Ph On Adsorptionmentioning

confidence: 99%

“…The Cr(VI) adsorption capacities of the other adsorbents from biomass waste. Data from [33,34,39,44,45].…”

Section: Adsorption Isothermmentioning

confidence: 99%

Activated Carbon Microsphere from Sodium Lignosulfonate for Cr(VI) Adsorption Evaluation in Wastewater Treatment

Yang

Xing

et al. 2020

Polymers

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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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“…This fact is due to the formation of chemical bonds between adsorbent and adsorbate at the surface [46], [47]. However, the Elovich model also fits well, so it is established that adsorption takes place inside the pores of the particles of the biomaterial and that their active sites are heterogeneous, which corresponds to the FTIR spectrum of lemon peel (Figure 1), where the complexity of the material is evidenced by the presence of multiple functional groups in its structure, characteristic of its lignocellulosic nature, as well as the high presence of C and O shown in the EDS spectrum ( Figure 3a); hence, they exhibit different activation energies throughout the adsorption process [43], [48], [49]. Adjusting the adsorption kinetics of Ni (II) and Pb (II) on the lemon peel suggests that the adsorption is carried out in two steps.…”

Section: Modelling Of Adsorption Kineticsmentioning

confidence: 99%

Adsorption in a binary system of Pb (II) and Ni (II) using lemon peels

Tovar

Sierra-Ardila

Meza-Acuña

et al. 2020

Rev.Fac.Ing.Univ.Antioquia

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The elimination of pollutants in water sources is a widely studied issue with the purpose of preserving the environment. In this work, the use of lemon peel (citrus lemon) as a bio-sorbent in the removal of Pb (II) and Ni (II) is studied, varying the temperature, adsorbent dose, and particle size. The materials were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analysis, to determine the bio adsorbent’s physicochemical properties. FTIR and EDS techniques confirmed the precipitation of ions on the adsorbent after the adsorption process. It was found that the optimal conditions according to the Response Surface Methodology (RSM) are: particle size for Ni (II) of 1 and 0.355 mm, adsorbent dose 0.077 g and 0.117 g, and temperatures of 34 and 45 ºC, for Pb (II) and Ni (II), respectively. The results reported that the Dubinin-Radushkevich isotherm and the pseudo-second-order model are more in line with the experimental data, suggesting that the adsorption process is driven by physisorption and occurs in multilayers. Thermodynamic parameters suggest that the process is exothermic for Ni (II) and endothermic for Pb (II), and irreversible. The binary study showed that there is no competition for active sites between the ions.

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Removal of Cr(VI) from synthetic wastewater by adsorption onto coffee ground and mixed waste tea

Cited by 158 publications

References 54 publications

Activated Carbon Microsphere from Sodium Lignosulfonate for Cr(VI) Adsorption Evaluation in Wastewater Treatment

Activated Carbon Microsphere from Sodium Lignosulfonate for Cr(VI) Adsorption Evaluation in Wastewater Treatment

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

Adsorption in a binary system of Pb (II) and Ni (II) using lemon peels

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