Removal of detergents and fats from waste water using allophane

Nishikiori, Hiromasa; Kobayashi, Kiyokazu; Kubota, Satoshi; Tanaka, Nobuaki; Fujii, Tsuneo

doi:10.1016/j.clay.2009.11.040

Cited by 20 publications

(12 citation statements)

References 23 publications

(26 reference statements)

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“…Furthermore, one can see that 5-10 min is enough to achieve adsorption equilibrium under the experimental conditions used in this study, which indicates that physical adsorption rather than ion exchange contributes mainly to the removal of metal ions by natural and synthetic allophane adsorbents. This finding is in line with previous experimental results, where allophane has been successfully used in the remediation of aqueous solutions that were contaminated with, for example, heavy metals cations [15,22,33,35], metal (oxy)anions [18,23,30], heterocyclic organic components [10] and anionic surfactants and organic acids [17,23]. …”

Section: Effect Of Contact Time On the Adsorption Kinetics Of Aqueoussupporting

confidence: 92%

“…Recently, agricultural and industrial waste products, activated carbon nanotubes, cellulose, carbonates, Feand Al-oxyhydroxides, zeolites, phosphates and clay minerals are used in the remediation of water that is severely polluted with persistent and hazardous components such as heavy metal ions, dyes, antibiotics, biocide compounds and other organic chemicals [12][13][14][15][16]. The use of clay minerals for wastewater treatment can be advantageous over other sorbents due to their worldwide occurrence, low mining and processing costs and outstanding physicochemical and surface properties, making clayey materials suitable for selective ion exchange, adsorption and catalyst uses [1,17,18].…”

Section: Introductionmentioning

confidence: 99%

“…Allophane "nanoballs" are characterized by a high surface area (> 300 m²/g). They are well-known to adsorb appreciable amounts of ionic or polar pollutants due to an amphoteric ligand exchange capacity [17,22,23]. To date, however, the sorption properties of allophane have not been effectively utilized in the remediation of wastewater.…”

Section: Introductionmentioning

confidence: 99%

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Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Baldermann¹,

Grießbacher²,

Baldermann³

et al. 2018

Preprint

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Abstract:The capacity and the mechanism of the adsorption of aqueous barium (Ba), cobalt (Co), strontium (Sr) and zinc (Zn) by Ecuadorian (NatAllo) and synthetic (SynAllo-1 and SynAllo-2) allophanes were studied as a function of contact time, pH and metal ion concentration using kinetic and equilibrium experiments. The mineralogy, nano-structure and chemical composition of the allophanes were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy and specific surface area analyses. The evolution of adsorption fitted to a pseudo-first-order reaction kinetics, where equilibrium between aqueous metal ions and allophane was reached within < 10 min. The metal ion removal efficiencies varied from 0.7 to 99.7 % at pH 4.0 to 8.5. At equilibrium, the adsorption behavior is better described by the Langmuir model than by the Dubinin-Radushkevich model, yielding sorption capacities of 10.6, 17.2 and 38.6 mg/g for Ba , 12.4, 19.3 and 29.0 mg/g for HCoO , 7.2, 15.9 and 34.4 mg/g for Sr and 20.9, 26.9 and 36.9 mg/g for Zn , respectively, by NatAllo, SynAllo-2 and SynAllo-1. The uptake mechanism is based on a physical adsorption process. Allophane holds great potential to remove aqueous metal ions and could be used instead of zeolites, montmorillonite, carbonates and phosphates for wastewater treatment.

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Section: Effect Of Contact Time On the Adsorption Kinetics Of Aqueoussupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Baldermann¹,

Grießbacher²,

Baldermann³

et al. 2018

Preprint

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“…The electrolyte for the photoelectric measurement consisted of a diethylene glycol solution of iodine (5.0×10 −2 mol dm −3 ) and lithium iodide (0.50 mol dm −3 ). The allophane (1.6SiO 2 ·Al 2 O 3 ·5-6H 2 O) was extracted by elutriation of Kanuma soil from Tochigi, Japan, as previously described (Nishikiori et al, 2009(Nishikiori et al, , 2010.…”

Section: Methodsmentioning

confidence: 99%

Photoelectrochemical properties of dye-dispersing allophane–titania composite electrodes

Nishikiori

Kanada

Setiawan

et al. 2015

Applied Clay Science

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Dye-dispersing allophane-titania composite electrodes were prepared from titanium alkoxide sols containing dye and allophane. The photoelectric conversion properties of the electrodes were investigated by photoelectrochemical measurements. The photocurrent values in the UV range decreased with an increase in the allophane content, whereas those in the visible range were increased by adding 1.0% (Al/Ti ratio) allophane. As a small amount of allophane nanoparticles were highly dispersed in the titania electrodes, the dye molecules were dispersed in the electrodes without decreasing the efficiency of the electron injection from the dye to the titania conduction band. The dye molecules dispersed on the titania nanoparticle surface were capped with allophane nanoparticles which prevented desorption. The dye molecules strongly interacted with the titania nanoparticle surface and efficiently injected the excited electrons into the titania conduction band.

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“…Glass plates coated with the ITO transparent electrode (60 mm × 25 mm) (AGC Fabritec) were soaked in hydrochloric acid (1.0 mol dm 3 ) for 1 h and then rinsed with water. The allophane (1.6SiO2·Al2O3·5-6H2O) was extracted by elutriation of Kanuma soil from Tochigi, Japan, as previously described [23,25,26].…”

Section: Methodsmentioning

confidence: 99%

Reaction in photofuel cells using allophane–titania nanocomposite electrodes

Nishikiori

Hashiguchi

Ito

et al. 2014

Applied Catalysis B: Environmental

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Allophane-titania nanocomposite electrodes for photofuel cells were prepared from titanium alkoxide sols dispersing the natural clay mineral allophane. The electrochemical measurements indicated that the oxidative degradation of starch in the solutions and suspensions enhanced the generation of electricity during UV irradiation. CO2 was observed as the degradation product. A higher photocurrent was observed using the allophane-titania nanocomposite electrode adsorbing a greater amount of the starch molecules. Allophane increased the capacity of the electrode to adsorb the starch molecules, even from the suspensions. This brought the molecules close to the titania nanoparticles, on which their oxidation induced the generation of electricity.

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Removal of detergents and fats from waste water using allophane

Cited by 20 publications

References 23 publications

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Photoelectrochemical properties of dye-dispersing allophane–titania composite electrodes

Reaction in photofuel cells using allophane–titania nanocomposite electrodes

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