Cadmium removal from aqueous solution by biochar obtained by co-pyrolysis of sewage sludge with tea waste

Fan, Shisuo; Li, Hui; Wang, Yi; Wang, Zhen; Tang, Jie; Tang, Jun; Li, Xuede

doi:10.1007/s11164-017-3094-1

Cited by 68 publications

(29 citation statements)

References 54 publications

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“…In the study, 1/n value is more than 1, indicating the Freundlich adsorption process is difficult for rhodamine 6G adsorption on MB500 and mainly in monolayer [19,21,22]. The kinetic mechanism for the adsorption of rhodamine 6G dye on magnetic biochar is an important study to provide information on the reaction pathway and the rate-controlling mechanism of exchange reactions [19]. The adsorption kinetics of rhodamine 6G in solution by MB500 at 25 and 40°C are shown in figure 7.…”

Section: Adsorption Studymentioning

confidence: 95%

“…All the experiment was replicated thrice and the averaged results are reported. The removal efficiency of rhodamine 6G was calculated using the following equation (1) and the adsorption capacity (q e ) was calculated based on the equation (2) [19,20].…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…When rhodamine 6G molecules were adsorbed onto the magnetic biochar (MB500) surface, some peaks of functional groups in the MB500 were shifted or weaken, such as stretching vibrations of C=O at 1617 cm −1 (shifted to 1619-1615 cm −1 ), C-O at 1087 cm −1 (shifted to 1050 cm −1 ) and Fe-O in Fe 3 O 4 moiety at 586 cm −1 (shifted to 562 cm −1 ). Therefore, the functional groups on the surface of magnetic biochar participate in the binding of biochar and rhodamine 6G molecule through hydrogen bonding, ion exchange, surface complexation and cation-π interaction [17][18][19].…”

Section: Adsorption Studymentioning

confidence: 99%

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Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk

Suwunwong

Patho

Choto

et al. 2020

Mater. Res. Express

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Magnetic biochars were prepared using Fe 3 O 4 nanoparticle composites onto the surface of biochar derived from rice husk. The characteristics of magnetic biochar were characterized by scanning electron microscope, x-ray powder diffraction and Fourier-transform infrared techniques. The removal of rhodamine 6G dye by magnetic biochar, compared to pristine biochar was studied. The effects of pyrolysis temperature on rhodamine 6G adsorption was evaluated. Kinetic, isotherms and thermodynamic studies were carried out to investigate the adsorption mechanism of rhodamine 6G dye on magnetic biochar surface. The rhodamine 6G removal efficiency of Fe 3 O 4 -composited biochar (pyrolyzed at 500°C) is higher than that of pristine biochar with maximum efficiency of 94% removal. The adsorption isotherm and kinetic studies indicated that the langmuir model, pseudo-first order and pseudo-second order models described well the rhodamine adsorption onto magnetic Fe 3 O 4 -biochar. Abbreviations BCBiochar C 0 Initial dye concentration (mg/L) C e Equilibrium concentration of dye (mg/L) ΔG 0 The Gibbs free energy) and f ΔH 0 The change of enthalpy MB Magnetic biochar q e Adsorbed dye amount per gram of sorbent at equilibrium (mg/g) q e,cal Calculated amount of dye adsorbed per gram of adsorbent at equilibrium (mg/g) q e,exp Experimental amount of dye adsorbed per gram of adsorbent at equilibrium (mg/g) q t Adsorbed dye amount per gram of adsorbent at time t (mg/g) K Thermodynamic equilibrium constant K L Langmuir isotherm equilibrium constant representing the energy of sorption (L/mg) K F Freundlich constant representing sorption capacity ((mg/g)(L/mg)/n) k 1 Pseudo-first order rate constant (1/min) k 2 Pseudo-second order rate constant (g/mg·min) n Freundlich isotherm constant representing sorption intensity R The ideal gas constant (8.314 J mol −1 ·K −1 )

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Section: Adsorption Studymentioning

confidence: 95%

Section: Adsorption Experimentsmentioning

confidence: 99%

Section: Adsorption Studymentioning

confidence: 99%

See 1 more Smart Citation

Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk

Suwunwong

Patho

Choto

et al. 2020

Mater. Res. Express

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“…The amount of metals adsorbed on BC-SC (q, μg of metal per g of adsorbent) was determined through the following equation: 36…”

Section: Theory/calculationmentioning

confidence: 99%

“…In addition, BC produced at low pyrolysis temperatures still had organic substances from the parental biomass as carbohydrates, polysaccharides, lipids and proteins, which do not contribute significantly to metal adsorption. 36,60 When all BC produced are compared, the BC500 had the best removal efficiency for most metals from a 500 μg L −1 multielement solution. At these conditions, the results indicated that removal rates were Pb II (96.17%) > 11 also reported that Pb was the most adsorbed cation on sesame straw BC (produced at 700 °C) in a multielement (Cu, Cr, Cd, Pb and Zn) aqueous solution (initial pH 7).…”

Section: Adsorption Of Trace Metals By Biochars Produced At Differentmentioning

confidence: 99%

Combined Analytical Py-GC/MS, SEM, FTIR and 13C NMR for Investigating the Removal of Trace Metals from Aqueous Solutions by Biochar

Andrade¹,

Monteiro²,

Gontijo³

et al. 2020

J. Braz. Chem. Soc.

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In this study, the efficiency of biochar (BC) produced from sugarcane bagasse at different pyrolysis temperatures (300, 400, 500 and 600 °C) for simultaneous removal of Cd II , Pb II , Cu II , Cr III , Ni II and Zn II ions from aqueous solutions was assessed. All BC were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR), 13 C nuclear magnetic resonance (13 C NMR) and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS). The effects of pyrolysis temperature, initial adsorbate concentration and adsorbent dosage on adorption capacity of BC were examined through batch experiments. The BC efficiency was also evaluated after a desorption cycle. The maximal adsorptions (Cd II : 51.50%, Cr III : 74.35%, Cu II : 91.18%, Ni II : 47.05%, Pb II : 96.17% and Zn II : 40.50%) were observed for BC produced at 500 °C, probably because of its higher porosity and presence of functional groups detected by SEM and FTIR. The maximum adsorption capacity for Cd II , Cr III , Cu II , Ni II and Zn II (ions fitted to Langmuir model) were 175, 303, 455, 156 and 128 μg g −1 , respectively. The predominance of phenolic groups observed in Py-GC-MS data may explain the high percentage of multi-element removal. Experimental data were best fitted to pseudo-second order, Sips and Freundlich models. The BC presented good removal results after a desorption cycle.

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Multi‐factorial investigation of the effect of biochar of the secondary medicinal residue of snow lotus on the adsorption of two azo dyes, methyl red and methyl orange

Zhang

Yao²,

et al. 2023

Microscopy Res & Technique

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Azo dye residues pollute water, which are difficult to decompose, and posing a major threat to the ecological environment. The residues of Chinese medicine still have many possibilities for use after its medicinal value has been brought into play. In this study, secondary residue biochar activation (Na2CO3‐modified, SBA) and secondary residue biochar (unmodified, SBC) were prepared from the secondary residue of snow lotus at 200–600°C. Surface features were obtained by Brunauer–Emmett–Teller N2 method and combined with scanning electron microscopy, and their structures were analyzed by x‐ray diffraction spectroscopy, Fourier infrared and near‐infrared spectroscopy. The effects of five factors, including initial concentration, contact time and adsorption temperature and so forth, on the adsorption of methyl red (MR) and methyl orange (MO) solutions were investigated. Results showed that the biochar yield, specific surface area, and pore size increased after modification. modification promoted the formation of the internal structure aromatization and oxygen‐containing functional groups. Adsorption experiments showed that the surroundings pH = 8, the dyes adsorption concentration of 8 mg/L, adsorption temperature of 20–40°C and time of about 1 h were more stable. Under the condition, the removal of MO by SBA could reach approximately 60%–80% (480–640 mg/g), while the removal of MR could reach more than 90% (>720 mg/g).The charcoal prepared and modified under high temperature conditions was more effective for MO adsorption, while MR relied on low temperature effectively. This study provides a new choice of adsorbent for MR and MO and finds a new direction for the utilization of snow lotus residues.

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Cadmium removal from aqueous solution by biochar obtained by co-pyrolysis of sewage sludge with tea waste

Cited by 68 publications

References 54 publications

Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk

Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk

Combined Analytical Py-GC/MS, SEM, FTIR and 13C NMR for Investigating the Removal of Trace Metals from Aqueous Solutions by Biochar

Multi‐factorial investigation of the effect of biochar of the secondary medicinal residue of snow lotus on the adsorption of two azo dyes, methyl red and methyl orange

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Cadmium removal from aqueous solution by biochar obtained by co-pyrolysis of sewage sludge with tea waste

Cited by 68 publications

References 54 publications

Enhancement the rhodamine 6G adsorption property on Fe3O4-composited biochar derived from rice husk

Enhancement the rhodamine 6G adsorption property on Fe3O4-composited biochar derived from rice husk

Combined Analytical Py-GC/MS, SEM, FTIR and 13C NMR for Investigating the Removal of Trace Metals from Aqueous Solutions by Biochar

Multi‐factorial investigation of the effect of biochar of the secondary medicinal residue of snow lotus on the adsorption of two azo dyes, methyl red and methyl orange

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Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk

Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk