Removal of 4‐chlorophenol from contaminated water using coconut shell waste pretreated with chemical agents

Kurniawan, Tonni Agustiono; Lo, Wai‐Hung; Repo, Eveliina; Sillanpää, Mika

doi:10.1002/jctb.2473

Cited by 66 publications

(14 citation statements)

References 79 publications

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“…electric power stations, cement factories). Removal of chlorophenols was investigated only on coconut shells 24, 25 . Hazelnut shells were applied for water removal of dyes 28, 29 and metal ions…”

Section: -18mentioning

confidence: 99%

Removal of chlorophenols from aqueous solutions by sorption onto walnut, pistachio and hazelnut shells

Kuśmierek

Świątkowski

2015

Polish Journal of Chemical Technology

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The effi ciency of walnut, pistachio and hazelnut shells to remove three monochlorophenols (2-CP, 3-CP and 4-CP) from aqueous solutions has been investigated. To describe the kinetic data pseudo-fi rst and pseudo-second order models were used. The kinetics data were fi tted better into the pseudo-second order model with the coeffi cient of determination values greater than 0.99. The k 2 values increased in the order 4-CP < 3-CP < 2-CP. Sorption was also analyzed as a function of solution concentration at equilibrium. The experimental data received were found to be well described by the Freundlich isotherm equation. Effectiveness of chlorophenols removal from water on the walnut, pistachio and hazelnut shells was comparable. Individual differences in sorption of monochlorophenols were also negligible.

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Section: -18mentioning

confidence: 99%

Removal of chlorophenols from aqueous solutions by sorption onto walnut, pistachio and hazelnut shells

Kuśmierek

Świątkowski

2015

Polish Journal of Chemical Technology

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“…Basically, it is a mass transfer process where a substance is transferred from a liquid phase to the surface of adsorbent and becomes bound by physico-chemical interactions [9]. Over the past years, granular activated carbon (GAC) in bulk form has been widely used to eliminate pollutants such as heavy metals [10][11][12][13]. Considering that nano-sized materials have properties different from their corresponding bulk forms, it is necessary to explore the applicability of carbon nanotubes (CNT) for Ace removal.…”

Section: Introductionmentioning

confidence: 99%

Enhanced removal of acetaminophen from synthetic wastewater using multi-walled carbon nanotubes (MWCNTs) chemically modified with NaOH, HNO3/H2SO4, ozone, and/or chitosan

Lin

Kurniawan

Albadarin

et al. 2018

Journal of Molecular Liquids

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This study investigates the technical feasibility of MWCNTs for acetaminophen (Ace) removal from synthetic wastewater in batch mode. To improve their removal performance, the surface of the MWCNTs was chemically modified with NaOH, HNO 3 /H 2 SO 4 , ozone and/or chitosan. The effects of pertinent parameters such as reaction time, dose, pH, and agitation speed on the Ace removal were evaluated. Their removal performance on Ace was compared to those of previous studies. The adsorption mechanisms of Ace removal by the MWCNTs are also presented. It is evident from this study that after chemical modification on its surface, the treated nano-adsorbent significantly enhanced Ace removal from wastewater. Among all types of those adsorbents, the ozone-treated MWCNT stands out for the highest Ace removal (95%) under the same initial Ace concentration of 10 mg/L. Their adsorption capacities, applicable to the Freundlich isotherm model, are listed as: ozone-treated MWCNT (250 mg/g) > chitosan-coated MWCNT (205 mg/g) > acid-treated MWCNT (160 mg/g) > NaOH-treated MWCNT (130 mg/g) > as-received MWCNT (90 mg/g). Although the ozone-treated MWCNT has the most outstanding performance in Ace removal, its treated effluent still could not meet the required effluent limit of less than 0.2 mg/L set by China's legislation. This suggests that further treatment using biological processes needs to be carried out to complement Ace removal from the wastewater samples.

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“…TiO 2 /SiO 2 was covered by the WO 3 particles. Although the TiO 2 /SiO 2 composite with the WO 3 improved its surface coverage, this blocked the pores of the TiO 2 /SiO 2 , thus reducing the active sites for Ace adsorption and leading to its lower removal[35].…”

mentioning

confidence: 99%

Enhanced photocatalytic degradation of acetaminophen from wastewater using WO3/TiO2/SiO2 composite under UV–VIS irradiation

Lin

Kurniawan

Zhang

et al. 2017

Journal of Molecular Liquids

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This study investigates the photocatalytic degradation of acetaminophen (Ace) from synthetic wastewater by individual TiO 2 , TiO 2 /SiO 2 and/or WO 3 /TiO 2 /SiO 2 composite under UV-VIS illumination. To characterize changes in their morphology and crystal structures before and after treatment, Χ-ray diffraction (ΧRD), Fourier transform infrared spectroscopy (FTIR), DRS UV-VIS absorption spectra, Brunaer-Emmer-Teller (BET) and scanning electron microscopy (SEM) techniques were used. The effects of varying loading ratios of the WO 3 on the TiO 2 /SiO 2 composite for Ace degradation were studied. Operating parameters such as initial concentration, reaction time, dose of photocatalyst and pH were tested. Degradation by-products were also presented. It is found that the photodegradation performance of the WO 3 /TiO 2 /SiO 2 composite as a photocatalyst in this study could be enhanced by optimizing the loading ratio of the WO 3. About 3% (w/w) of WO 3 /TiO 2 /SiO 2 was found to improve the degradation of Ace from 33% to 95% at the same initial concentration of 5 mg/L. The resulting oxidation by-products included hydroquinone and 1,4-benzoquinone. Under the same conditions, the result of photocatalytic degradation by the 3% (w/w) of WO 3 /TiO 2 /SiO 2 composite was significantly higher (95%) than that by the individual TiO 2 /SiO 2 (42%) and/or by the TiO 2 alone (33%). Under optimized conditions (1.5 g/L; 3% (w/w) of WO 3 /TiO 2 /SiO 2 composite; pH 9; 4 h of reaction time), 95% of Ace removal with an initial concentration of 5 mg/L could be attained. However, the treated effluents still could not meet the discharge standard of less than 0.2 mg/L set by China's and US legislation. This indicates that further subsequent treatment like biological processes is still necessary for completing the removal of target pollutant from the wastewater samples.

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Removal of 4‐chlorophenol from contaminated water using coconut shell waste pretreated with chemical agents

Cited by 66 publications

References 79 publications

Removal of chlorophenols from aqueous solutions by sorption onto walnut, pistachio and hazelnut shells

Removal of chlorophenols from aqueous solutions by sorption onto walnut, pistachio and hazelnut shells

Enhanced removal of acetaminophen from synthetic wastewater using multi-walled carbon nanotubes (MWCNTs) chemically modified with NaOH, HNO3/H2SO4, ozone, and/or chitosan

Enhanced photocatalytic degradation of acetaminophen from wastewater using WO3/TiO2/SiO2 composite under UV–VIS irradiation

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