Selective removal of phosphate using La-porous carbon composites from aqueous solutions: Batch and column studies

Koilraj, Paulmanickam; Sasaki, Keiko

doi:10.1016/j.cej.2017.02.075

Cited by 206 publications

(61 citation statements)

References 37 publications

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“…37 The gained sp 2 carbon content in MWHHTC(1)-800 was clear from those spectra. The C]C functional group in MWHHTC(1)-800 was signicantly increased by carbonization and magnetization of relative to initial non-magnetic biochar (WHHTC), from 43.3% to 65.5%, in accordance with the decrease in oxygen content (Table S1 † 39 The increased content of C]C (sp 2 ) and decreased intensity of oxygen functionalities in MWHHTC(1)-800 indicate that simultaneous magnetization and activation at 800 C not only improved the porosity but also changed the chemical nature of the carbon product. Moreover, the absence of Fe signal in the wide scan might be caused by the embedding of iron particles deep in the carbon matrix, so they could not be detected by XPS.…”

Section: Magnetic Carbon Materials As An Adsorbentmentioning

confidence: 80%

Green and sustainable zero-waste conversion of water hyacinth (Eichhornia crassipes) into superior magnetic carbon composite adsorbents and supercapacitor electrodes

et al. 2019

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Troublesome aquatic weed, water hyacinth (Eichhornia crassipes) was converted into solid and liquid fractions via green and energy-saving hydrothermal carbonization (HTC). The solid product, hydrochar, was employed as a precursor to prepare magnetic carbon materials by simple activation and magnetization using KOH and Fe 3+ ions, respectively. The obtained magnetic adsorbent possessed good magnetic properties and presented outstanding capacities to adsorb methylene blue (524.20 mg g À1 ), methyl orange (425.15 mg g À1 ) and tetracycline (294.24 mg g À1 ) with rapid adsorption kinetics even at high concentrations (up to 500 mg L À1 ), attributed to high specific surface area and mesopore porosity.Besides the solid hydrochar, the water-soluble liquid product was used to fabricate carbon-based supercapacitors through facile KOH activation with a considerably lower KOH amount in comparison to conventional activation. The supercapacitor electrode made from activated liquid product possessed an extremely high specific surface area of 2545 cm 2 g À1 and showed excellent specific capacitance (100 F g À1 or 50 F cm À3 at 1 A g À1 ) and good retention of capacitance (92% even after 10 000 cycles). This work demonstrated that both solid and liquid HTC fractions from this bio-waste can serve as effective sources to prepare functional carbon materials, making this approach a sustainable zero-waste biomass conversion process. Scheme 1The preparation steps of magnetic adsorbent (MWHHTC(1)-800) and carbon-based supercapacitor (CLP + KOH-800) using water hyacinth as a carbon precursor.This journal is

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Section: Magnetic Carbon Materials As An Adsorbentmentioning

confidence: 80%

Green and sustainable zero-waste conversion of water hyacinth (Eichhornia crassipes) into superior magnetic carbon composite adsorbents and supercapacitor electrodes

et al. 2019

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“…The binding energies of the primary La 3d 5/2 and La 3d 3/2 bands were at 835.9 eV and 852.7 eV, respectively, and the corresponding satellites were located on their higher binding energy side at 839.2 eV and 856.3 eV, respectively. 42 The spin-orbit splitting of the primary La 3d 5/2 and La 3d 3/2 bonds was 16.8 eV. These satellite peaks were observed due to the transfer of an electron from O 2p to the empty 4f shell of La, leading to the 3d 9 4f 1 nal state.…”

Section: 35mentioning

confidence: 93%

Insight into mechanisms of fluoride removal from contaminated groundwater using lanthanum-modified bone waste

et al. 2017

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“…It shows that both monovalent nitrate and chloride slightly increased the adsorption of CrO 4 2− , while fluoride decreased the adsorption of CrO 4 2− . The enhanced uptake may be due to increase in the ionic strength of the medium, similar observation were reported earlier on La incorporated porous carbon composite for phosphate removal . In the cases of sulfate, carbonate, phosphate and arsenate, the CrO 4 2− adsorption decreased severely, which suggests that the multivalent anion clearly hampered the sorption capacity of CrO 4 2− .…”

Section: Resultsmentioning

confidence: 67%

Eco‐Friendly Alkali‐Free Arginine‐Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency

Koilraj

Sasaki

2017

ChemistrySelect

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A new one‐pot synthesis of highly crystalline MgAl‐, CoAl‐ and ZnAl‐layered double hydroxides (LDHs) containing NO3− as interlayer anion along with the surface functionalization of L‐arginine was demonstrated by the ecofriendly alkali‐free arginine‐assisted hydrothermal method to examine the adsorptive reduction of chromate (CrO42−) from aqueous solutions. The amino acid mediated water hydrolysis resulted abundant OH− in the medium, which served as precipitant, and the NO3− from metal precursor acts as an interlayer anion along with surface functionalization of amino acid. Adsorption studies revealed that the removal of CrO42− by anion exchange was the greatest in MgAl‐LDH with 1.619 mmol‐Cr/g of LDH. The mechanism of CrO42− removal was due to the ion‐exchange of NO3− from the interlayer as well as the counter anions present on the functionalized arginine cation. The adsorbed CrO42− was partially reduced to nontoxic Cr3+ on the surface of LDH due to the presence of amino acid functionalization. The present technique provides several advantages from the aspect of sustainable chemistry: (i) avoiding hazardous alkali for the preparation of LDH, (ii) removal of CrO42− by ion‐exchange and (iii) partial detoxification of CrO42− by reduction to Cr3+ on the surface of the LDH.

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Selective removal of phosphate using La-porous carbon composites from aqueous solutions: Batch and column studies

Cited by 206 publications

References 37 publications

Green and sustainable zero-waste conversion of water hyacinth (Eichhornia crassipes) into superior magnetic carbon composite adsorbents and supercapacitor electrodes

Green and sustainable zero-waste conversion of water hyacinth (Eichhornia crassipes) into superior magnetic carbon composite adsorbents and supercapacitor electrodes

Insight into mechanisms of fluoride removal from contaminated groundwater using lanthanum-modified bone waste

Eco‐Friendly Alkali‐Free Arginine‐Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency

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