One-pot synthesis of ZnO/oligoaniline nanocomposites with improved removal of organic dyes in water: Effect of adsorption on photocatalytic degradation

Chen, Mingxin; Bao, Chongzhuo; Cun, Tangxiang; Huang, Qiang

doi:10.1016/j.materresbull.2017.08.017

Cited by 42 publications

(10 citation statements)

References 53 publications

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“…Disposal of untreated organic waste in the aquatic ecosystem is a global issue, mainly because these pollutants can cause serious damage to aquatic organisms as well as to humans [11,12]. Among the main organic pollutants are dyes, which are classified as toxic and carcinogenic.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Costa

Paranhos

2019

SN Appl. Sci.

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The rice husk ash (RHA) extracted from the rice husk (RH) was measured on the removal of the Remazol Red dye. Adsorption variables such as solution pH, dye concentration, adsorbent amount, contact time, and reuse of the RHA were measured. The adsorption equilibrium was achieving in approximately 30 min, due to the rapid electrostatic attraction between the OH 2 + groups of the RHA surface and the sulfonic groups of the dye, which occurred mainly at a pH = 2 value. The removal efficiency of the RHA decreased when the initial dye concentrations were higher, due to pore-filling within of the RHA structure with the migration dye molecules. However, the removal percentage increased with increasing adsorbent amount. The adsorption data were suitable with the Freundlich isotherm and pseudo-second order models.

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Section: Introductionmentioning

confidence: 99%

Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Costa

Paranhos

2019

SN Appl. Sci.

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“…It's reasonable that the increased illumination intensity means more photon irradiated on TiO2 surface, that can produce more ·OH, which is the main radical in photocatalytic reaction. According to other works [32], photoreaction rate coefficient kpm depends on illumination intensity in a power law = n pm k I (13) The value of intensity coefficient α and exponent n was 2.24 × 10 −14 and 1.482 obtained by using the results in Table 1.…”

Section: Kinetic Study Of Photocatalytic Degradation Of Benzene Undermentioning

confidence: 61%

“…So the overall photocatalytic reaction rate is mainly dominated by the adsorption rate. Furthermore, the adsorption rate can be equivalently expressed using the coverage ratio of the adsorbed reactants on the surface of the photocatalysts [12][13][14][15]. So the photocatalytic reaction rate r can be expressed as Equation (1) [16][17][18], which is widely known as the original L-H model.…”

Section: Introductionmentioning

confidence: 99%

Modification to L-H Kinetics Model and Its Application in the Investigation on Photodegradation of Gaseous Benzene by Nitrogen-Doped TiO2

et al. 2018

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In this paper, the Langmuir-Hinshelwood (L-H) model has been used to investigate the kinetics of photodegradation of gaseous benzene by nitrogen-doped TiO 2 (N-TiO 2 ) at 25 • C under visible light irradiation. Experimental results show that the photoreaction coefficient k pm increased from 3.992 × 10 −6 mol·kg −1 ·s −1 to 11.55 × 10 −6 mol·kg −1 ·s −1 along with increasing illumination intensity. However, the adsorption equilibrium constant K L decreased from 1139 to 597 m 3 ·mol −1 when the illumination intensity increased from 36.7 × 10 4 lx to 75.1 × 10 4 lx, whereas it was 2761 m 3 ·mol −1 in the absence of light. This is contrary to the fact that K L should be a constant if the temperature was fixed. This phenomenon can be attributed to the breaking of the adsorption-desorption equilibrium by photocatalytically decomposition. To compensate for the disequilibrium of the adsorption-desorption process, photoreaction coefficient k pm was introduced to the expression of K L and the compensation form was denoted as K m . K L is an indicator of the adsorption capacity of TiO 2 while K m is only an indicator of the coverage ratio of TiO 2 surface. The modified L-H model has been experimentally verified so it is expected to be used to predict the kinetics of the photocatalytic degradation of gaseous benzene.

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“…To further understand the adsorption nature, the kinetic behavior of the S/C‐TiO 2 ‐0.5 sample was studied. The adsorption mechanism was quantified using pseudo‐first‐order and pseudo‐second‐order equations :

\ln (q_{normale} - q_{normalt}) = \ln q_{normale} K_{1} t

\frac{t}{q_{t}} = \frac{1}{k_{2} q_{normale}^{2}} + (\frac{1}{q_{normale}}) t

where k 1 (min −1 ) and k 2 (g mg −1 min −1 ) are the pseudo‐first‐order and pseudo‐second‐order rate constants, respectively; and q e and q t (mg g −1 ) are the amounts of metal ions adsorbed onto the adsorbent at the equilibrium time and time t , respectively. The value of k 1 can be calculated from the slope of the linear plot of ln( q e − q t ) versus t .…”

Section: Resultsmentioning

confidence: 99%

Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Zou

Shang

Wang

et al. 2019

CLEAN Soil Air Water

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Highly toxic divalent cadmium causes serious environmental issues. To quickly monitor and/or efficiently remove this potentially toxic metal ion as well as to explore its interfacial chemistry with metal oxides, a sulfur and carbon co-doped titania (S/C-TiO 2 ) composite is synthesized via a facile sol-gel method with the assistance of sodium lignosulphonate (SLS). The prepared composite displays a well-crystallized TiO 2 nanostructure comprising the anatase phase. Both S and C, which are derived from the SLS template, are found to enter the TiO 2 lattice. The S/C-TiO 2 composite exhibits a porous structure with a wide pore size distribution. The newly synthesized composite shows adsorption capability for the potentially toxic metal Cd(II). The adsorption process requires <5 min to reach equilibrium. The measured equilibrium adsorption capacity is 19.42 mg g −1 , which is twice as high as that of bare TiO 2 . The removal efficiency is as high as 97%. Moreover, the materials are suitable for contaminated solutions over a wide range of pH values and various initial cadmium concentrations. A mechanism for the enhanced adsorption behavior is also proposed.

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One-pot synthesis of ZnO/oligoaniline nanocomposites with improved removal of organic dyes in water: Effect of adsorption on photocatalytic degradation

Cited by 42 publications

References 53 publications

Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Modification to L-H Kinetics Model and Its Application in the Investigation on Photodegradation of Gaseous Benzene by Nitrogen-Doped TiO2

Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

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One-pot synthesis of ZnO/oligoaniline nanocomposites with improved removal of organic dyes in water: Effect of adsorption on photocatalytic degradation

Cited by 42 publications

References 53 publications

Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Modification to L-H Kinetics Model and Its Application in the Investigation on Photodegradation of Gaseous Benzene by Nitrogen-Doped TiO2

Sulfur and Carbon Co‐doped TiO2 Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

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Product

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Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium