The application of green tea extract to prepare bentonite-supported nanoscale zero-valent iron and its performance on removal of Cr(VI): Effect of relative parameters and soil experiments

Soliemanzadeh, Akbar; Fekri, Majid

doi:10.1016/j.micromeso.2016.09.050

Cited by 126 publications

(47 citation statements)

References 40 publications

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“…This behavior could be explained due to the fact that further available sorption sites on the WICF were found to be limited, hence, resulting in the decrease of the overall adsorption percentage. Similar findings have been reported elsewhere (Naushad et al, 2016;Soliemanzadeh & Fekri, 2017;.…”

Section: Effect Of Initial Concentration Of Patulin On Patulin Adsosupporting

confidence: 93%

Assessment of patulin adsorption efficacy from aqueous solution by water‐insoluble corn flour

Guo

Zhang

et al. 2017

Journal of Food Safety

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This study investigated water-insoluble corn flour (WICF) as a novel biosorbent for removing patulin from aqueous solutions, including contaminated fruit juices. Batch adsorption experiments were performed to assess the effect of granularity of WICF, adsorbent dosage, contact time, temperature, pH, and initial patulin concentration. The results showed that the maximum removal percentage of 92.21% was achieved at 37 8C, pH value of 4.0 in 100 mg/L patulin concentration for 25 hr. The adsorption data could be well fitted with the Freundlich isotherm model and the pseudo-first order model. Thermodynamic parameters indicated that mycotoxin adsorption is an endothermic and spontaneous process. Subsequently, scanning electron microscopy images showed obvious morphological changes in WICF after adsorbing patulin. Fourier transform infrared spectroscopy spectroscopic evidence demonstrated that the main functional groups involved in the adsorption were O-H, C 5 O and C-O groups. Practical applicationsPatulin was found as a contaminant in various fruit juices, which raised serious concerns about developing an effective and cheap adsorbent for detoxification of patulin toxin in fruit juice and their products. Water-insoluble corn flour was applied to strengthen the control of patulin for the first time. Results of this study indicated that water-insoluble corn flour has a strong ability to remove patulin from aqueous solutions and various fruit juices. Therefore, using water-insoluble corn flour as an adsorbent and combining the filtration process could be potentially applied in fruit juice industry for detoxification of patulin.

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Section: Effect Of Initial Concentration Of Patulin On Patulin Adsosupporting

confidence: 93%

Assessment of patulin adsorption efficacy from aqueous solution by water‐insoluble corn flour

Guo

Zhang

et al. 2017

Journal of Food Safety

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“…Above the pH zpc , the magnetic goethite surface becomes positively charged, while Cr(VI) exists predominantly as H 2 CrO 4 and HCrO 4 − in aqueous solution. Thus, under acidic conditions, electrostatic attraction and a coordination complex lead to favourable adsorption . With increase of the pH, the adsorption of Cr(VI) decreases due to the electrostatic repulsion and competitive adsorption of OH − and CrO 4 2− .…”

Section: Resultsmentioning

confidence: 99%

“…Thus, under acidic conditions, electrostatic attraction and a coordination complex lead to favourable adsorption. [33] With increase of the pH, the adsorption of Cr(VI) decreases due to the electrostatic repulsion and competitive adsorption of OH À and CrO 4 2À . Below the pH zpc , the Cr(VI) exists in aqueous solution in the forms HCrO 4 À and CrO 4 2À within the pH range 4-11.…”

Section: Effect Of Ph On Cr(vi) Removalmentioning

confidence: 99%

Removal of Cr(VI) from Wastewater by a Novel Adsorbent of Magnetic Goethite: Adsorption Performance and Adsorbent Characterisation

Liu

Chen

et al. 2019

ChemistrySelect

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A novel adsorbent of magnetic goethite was prepared by neutralisation hydrolysis and employed for Cr(VI) adsorption from aqueous solution. The magnetic goethite adsorbent was characterised by using scanning electron microscopy (SEM), X‐ray diffractometer (XRD), vibrating sample magnetometer (VSM), fourier transform infrared (FTIR), brunauer‐Emmett‐Teller (BET) and X‐ray photoelectron spectroscopy (XPS) method. VSM showed that the prepared adsorbents are super‐paramagnetic iron hydroxide. FTIR spectra revealed that magnetic goethite have ‐OH and other functional groups. The effects of various factors, including pH, adsorbent dosage, initial concentration, and ion concentration, were evaluated. Under the conditions of pH 3, 4 g/L magnetic goethite, 20 mg/L Cr(VI) concentration, and 0.01 mol/L NaNO3, the removal efficiency of Cr (VI) reached 88.2% and the adsorption capacity of the adsorbent reached 4.32 mg/g. The adsorption kinetic tests showed that the adsorption of Cr(VI) on the adsorbent matched well with pseudo‐second‐order kinetics, indicating the occurrence of chemisorption. The fitting of the Langmuir isotherm model showed that the adsorption of Cr(VI) on magnetic goethite was monolayer adsorption. On the other hand, thermodynamic studies conjectured that the adsorption processes of magnetic goethite for Cr(VI) was endothermic and spontaneous. These results suggest that magnetic goethite has great potential for the removal of heavy metals from wastewater.

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“…It was showed that supported NZVI in humus has succeeded in preventing aggregation and oxidation [39] . Also, the presence of bentonite could decrease the aggregation of nZVI and increase its reactivity [40,41] .…”

Section: Advances In Engineering Research Volume 112mentioning

confidence: 99%

Physio-chemical treatment technologies for chromium removal

Zhang¹,

Li²

2017

Proceedings of the 2016 4th International Conference on Renewable Energy and Environmental Technology (ICREET 2016)

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Abstract. The article reviews the technical applicability of various physio-chemical treatments for the removal of hexavalent chromium (Cr(VI)) from aqueous solution. A particular focus is given to membrane electrolysis, photocatalytic reduction, adsorption and the application of nanotechnology in Cr(VI) removal. About 50 published studies (2011)(2012)(2013)(2014)(2015)(2016)(2017) are reviewed. Liquid membrane and electrodialysis were combined. Metal-organic frameworks (MOFs) emerged to enhance photocatalytic reduction. It is evident that adsorption is the most frequently studied and widely applied for the treatment of Cr(VI). And nanotechnology is mainly applied to nanoadsorbent which exhibited both reduction and adsorption capabilities. In general, further researches on methods with cost-effectiveness, technical-applicability, and plant-simplicity are vital for heavy metal removal such as chromium.

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The application of green tea extract to prepare bentonite-supported nanoscale zero-valent iron and its performance on removal of Cr(VI): Effect of relative parameters and soil experiments

Cited by 126 publications

References 40 publications

Assessment of patulin adsorption efficacy from aqueous solution by water‐insoluble corn flour

Assessment of patulin adsorption efficacy from aqueous solution by water‐insoluble corn flour

Removal of Cr(VI) from Wastewater by a Novel Adsorbent of Magnetic Goethite: Adsorption Performance and Adsorbent Characterisation

Physio-chemical treatment technologies for chromium removal

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