New Generation Adsorbents for Water Treatment

Ali, Imran

doi:10.1021/cr300133d

Cited by 1,693 publications

(773 citation statements)

References 216 publications

Supporting

Mentioning

758

Contrasting

Unclassified

Order By: Relevance

“…In situ Raman spectroscopy was performed to study the transitions of PANI at different cell voltages in H 2 SO 4 and H 2 CrO 4 electrolytes ( Figure 5A). In H 2 SO 4 electrolyte, the fully oxidized form (pernigraniline form) of the PANI shows typical bands located at 1160, 1254, and 1514 cm −1 , assigned to C−H bending of the quinoid ring, C−N stretching of the quinoid ring, and CN stretching of the quinoid ring, respectively.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…3 Cr(III) is less toxic and can be easily precipitated or adsorbed on various adsorbents. 4 Therefore, the reduction of Cr(VI) to Cr(III) is considered to be a promising strategy for detoxification of Cr(VI). 5−7 Current approaches for the reduction of Cr(VI) include chemical reduction, photocatalytic reduction, bioreduction, and electroreduction.…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microfluidic Flow through Polyaniline Supported by Lamellar-Structured Graphene for Mass-Transfer-Enhanced Electrocatalytic Reduction of Hexavalent Chromium

Zhang

et al. 2015

Environ. Sci. Technol.

104

View full text Add to dashboard Cite

Owing to its high efficiency and environmental compatibility, electroreduction holds great promise for the detoxification of aqueous Cr(VI). However, the typical electroreduction system often shows poor mass transfer, which results in slow reduction kinetics and hence higher energy consumption. Here, we demonstrate a flow-through electrode of polyaniline supported on lamellar-structured graphene (LGS−PANI) for electrocatalytic reduction of Cr(VI). The reaction kinetics of the LGS− PANI flow-through electrodes are 6.4 times (at acidic condition) and 17.3 times (at neutral condition) faster than traditional immersed parallel-plate electrodes. Computational fluid dynamics simulation suggests that the flowthrough mode greatly enhances the mass transfer and that the nanoscale convection induced by the PANI nanodots increases the nanoscale mass transport in the interfacial region of the electrode/ solution. In situ Raman spectroscopy shows that the PANI−Cr(VI) redox reactions are dominated by the leucoemeraldine/ emeraldine transition at 1.5 V cell voltage, which also remarkably contributes to the fast reaction kinetics. Using single-pass flowthrough mode, the LGS−PANI electrode reaches an average reduction efficiency of 99.

show abstract

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Microfluidic Flow through Polyaniline Supported by Lamellar-Structured Graphene for Mass-Transfer-Enhanced Electrocatalytic Reduction of Hexavalent Chromium

Zhang

et al. 2015

Environ. Sci. Technol.

104

View full text Add to dashboard Cite

show abstract

“…Adsorption processes have been regarded as a potentially interesting option to complement existing water and wastewater treatment systems aiming to improve the removal of many organic xenobiotic pollutants, including pharmaceuticals [10,[13][14][15][16][17][18][19]. However, the selection of the adsorbent materials is crucial, not solely from the perspective of the pollutants removal efficiency but also in regard to its cost.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of removal of three widespread pharmaceuticals by two clay materials

Dordio

Miranda

Ramalho

et al. 2017

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…In order to use CNTs in SPME, the affinity of the adsorbates (CPCs) for the adsorbent (CNTs) should be considered as the primary step (Ali 2012;Gupta et al 2011b). For activated carbon derived from Jatropha curcas seeds, for example, adsorption capacities for chlorinated volatile hydrocarbons are affected significantly by the number of chlorine atoms and the chemical polarities of these hydrocarbons (Hsu et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Influence of chlorine substitution on adsorption of gaseous chlorinated phenolics on multi-walled carbon nanotubes embedded in SiO2

Tulaphol

Bunsan²,

Kanchanatip

et al. 2016

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Multi-walled carbon nanotubes (MWCNTs) embedded in SiO 2 particles were prepared through the floating-catalyst chemical vapor deposition method. The parameters reaction time and flow rate of the carbon source (CH 4 ) were studied to obtain optimum conditions for MWCNT synthesis. The obtained MWCNTs were characterized by transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, and Fourier transform infrared spectroscopy to confirm their morphology and crystallinity. The optimum conditions were a CH 4 flow rate of 100 ml/min in a H 2 -Ar mixture at a flow rate of 500 ml/min and a reaction time of 20 min. Under these conditions, MWCNTs with average outer and inner diameters of around 50 and 10 nm, respectively, were obtained. SiO 2 particles with embedded MWCNTs were studied for their adsorption of gaseous chlorinated phenolic compounds (CPCs), with emphasis on the effect of number of chlorine substituents. The CPC compounds of 2-chlorophenol (CP) and 2,4-dichlorophenol (DCP) were compared against phenol (P). Adsorption of P and CPCs on the particles fit well the Langmuir isotherm. The adsorption capacities of P, CP, and DCP on SiO 2 particles with embedded MWCNTs were found to be 3.12, 13.83, and 44.25 mg/g, respectively. Desorption activation energy was determined by thermogravimetric analysis. Chlorine substitution on P changed the adsorption process from physical to chemical adsorption. The particles showed high potential for use as a pre-concentration unit for solid-phase microextraction.

show abstract

New Generation Adsorbents for Water Treatment

Cited by 1,693 publications

References 216 publications

Microfluidic Flow through Polyaniline Supported by Lamellar-Structured Graphene for Mass-Transfer-Enhanced Electrocatalytic Reduction of Hexavalent Chromium

Microfluidic Flow through Polyaniline Supported by Lamellar-Structured Graphene for Mass-Transfer-Enhanced Electrocatalytic Reduction of Hexavalent Chromium

Mechanisms of removal of three widespread pharmaceuticals by two clay materials

Influence of chlorine substitution on adsorption of gaseous chlorinated phenolics on multi-walled carbon nanotubes embedded in SiO2

Contact Info

Product

Resources

About