Multi-walled carbon nanotubes-ionic liquid-carbon paste electrode as a super selectivity sensor: Application to potentiometric monitoring of mercury ion(II)

Khani, Hadi; Rofouei, Mohammad Kazem; Arab, Pezhman; Gupta, Vinod K.; Vafaei, Zahra

doi:10.1016/j.jhazmat.2010.07.039

Cited by 701 publications

(181 citation statements)

References 39 publications

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“…As it is noticeable from Fig. 7b, c and Table 2, we revealed that pseudo-second-order kinetic model can best elucidate the sorption process because it possessed a higher 0.99 R 2 value (Khani et al 2010;Mittal et al 2010a;Gupta et al 2012b;Saleh and Gupta 2012b). These results confirmed the paramount role of electrostatic attractions in the ratelimiting step.…”

Section: Sorption Kineticssupporting

confidence: 73%

Site-specific functionalization for chemical speciation of Cr(III) and Cr(VI) using polyaniline impregnated nanocellulose composite: equilibrium, kinetic, and thermodynamic modeling

2015

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Site-specific functionalizations are the emergent attention for the enhancement of sorption latent of heavy metals. Limited chemistry has been applied for the fabrication of diafunctionalized materials having potential to tether both environmentally stable oxidation states of chromium (Cr(III) and Cr(VI). Polyaniline impregnated nanocellulose composite (PANI-NCC) has been fabricated using click chemistry and explored for the removal of Cr(III) and Cr(VI) from hydrological environment. The structure, stability, morphology, particle size, surface area, hydrophilicity, and porosity of fabricated PANI-NCC were characterized comprehensively using analytical techniques and mathematical tools. The maximum sorption performance of PANI-NCC was procured for (Cr(III): 47.06 mg g -1 ; 94.12 %) and (Cr(VI): 48.92 mg g -1 ; 97.84 %) by equilibrating 0.5 g sorbent dose with 1000 mL of 25 mg L -1 chromium conc. at pH 6.5 and 2.5 for Cr(III) and Cr(VI), respectively. The sorption data showed a best fit to the Langmuir isotherm and pseudosecond-order kinetic model. The negative value of DG°(-8.59 and -11.16 kJ mol -1 ) and DH°(66.46 9 10 -1 and 17.84 9 10 -1 kJ mol -1 ), and positive value of DS°(26.66 and 31.46 J mol -1 K -1 ) for Cr(III) and Cr(VI), respectively, reflect the spontaneous, feasibility, and exothermic nature of the sorption process. The application of fabricated PANI-NCC for removing both the forms of chromium in the presence of other heavy metals was also tested at laboratory and industrial waste water regime. These findings open up new avenues in the row of high performance, scalable, and economic nanobiomaterial for the remediation of both forms of chromium from water streams.

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Section: Sorption Kineticssupporting

confidence: 73%

Site-specific functionalization for chemical speciation of Cr(III) and Cr(VI) using polyaniline impregnated nanocellulose composite: equilibrium, kinetic, and thermodynamic modeling

2015

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“…A number of agricultural waste materials have being studied for the removal of different pollutants from aqueous solutions at different operating conditions. They include: cassava peel , sugar beet pulp (Aksu and İşoglu 2005), Nipha Palm (Wankasi et al 2006), rice bran (Suzuki et al 2007), coconut husk Tan et al, 2008), periwinkle shell (Bello et al 2008), orange peel (Ningchuan et al 2009), cocoa pod husk (Bello and Ahmad 2011), mango leaf (Khan et al 2011), coconut shell (Bello and Ahmad 2012), loquat leaves (Akl and Salem 2012), durian seed , TiO 2 /UV, , CNT/magnesium oxide composite , fertilizer waste, (Gupta et al 1998), waste material adsorbents (Mittal et al 2011), waste material adsorbents (Mittal et al 2009a), waste material adsorbents (Mittal et al 2009b), waste material adsorbents , tire derived carbons (Saleh and Gupta 2013), alumina-coated carbon nanotubes (Gupta et al 2011), industrial wastes (Jain et al 2003), Waste materials, , Multi-walled carbon nanotubes-ionic liquid-carbon paste electrode (Khani et al 2010), mesoporous activated carbon (Karthikeyan et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Sustainable conversion of agro-wastes into useful adsorbents

et al. 2016

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Preparation and characterization of raw and activated carbon derived from three different selected agricultural wastes: kola nut pod raw and activated (KNPR and KNPA), bean husk raw and activated (BHR and BHA) and coconut husk raw and activated (CHR and CHA) were investigated, respectively. Influences of carbonization and acid activation on the activated carbon were investigated using SEM, FTIR, EDX, pH pzc and Boehm titration techniques, respectively. Carbonization was done at 350°C for 2 h followed by activation with 0.3 M H 3 PO 4 (orthophosphoric acid). Results obtained from SEM, FTIR, and EDX revealed that, carbonization followed by acid activation had a significant influence on morphology and elemental composition of the samples. SEM showed welldeveloped pores on the surface of the precursors after acid treatment, FTIR spectra revealed reduction, broadening, disappearance or appearance of new peaks after acid activation. EDX results showed highest percentage of carbon by atom respectively in the order BHA [ KNPA [ CHA respectively. The pH pzc was found to be 5.32, 4.57 and 3.69 for KNPA, BHA and CHA, respectively. Boehm titration result compliments that of pH pzc , indicating that the surfaces of the prepared adsorbents are predominantly acidic. This study promotes a sustainable innovative use of agrowastes in the production of cheap and readily available activated carbons, thereby ensuring more affordable water and effluent treatment adsorbents.

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“…0 (mg/g min) k 2 Pseudo-second-order constant (g/mg min) a Initial metal adsorption rate (mg/g min) b…”

mentioning

confidence: 99%

“…Experimental maximum adsorption capacity (mg/g) R 2 Correlation coefficient AAS Atomic absorption spectrophotometer k f Multilayer adsorption capacity (mg/g) V Volume of metal solution (dm 3 ) AD Adsorbent dosages m Mass of adsorbent (g) EPU Electroplating unit…”

mentioning

confidence: 99%

Use of cellulose acetate–tin (lV) phosphate composite (CA/TPC) in highly effective removal and recovery of heavy metal ions

et al. 2015

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A novel cellulose acetate-tin (IV) phosphate composite material has been synthesized under varying conditions. The material was characterized by FTIR, SEM, EDX and XRD. The composite material was explored for its use in separation of toxic metal cations present in electroplating waste discharge and similar synthetic fluid by varying the system conditions [temperature (298-313 K), pH (2-12), time (10-420 min), dosage (1-10 g) and initial concentration of metal cations (1.0-15.0 mg/dm 3 )]. Highest removal rate was achieved for Cr 3? , Ni 2? and Zn 2? (99, 98 and 94 %) under optimal conditions. Experimental equilibrium data for Cr 3? , Ni 2? and Zn 2? ions fitted well with Langmuir isotherms (R 2 [ 0.99). The adsorption capacities for Cr 3? , Ni 2? and Zn 2? ions were found to be 31.5, 43.7 and 43.4 mg/g. Pseudo-second-order model explained the kinetics of adsorption (R 2 [ 0.99) for all the metal ions undertaken in the study. Thermodynamic parameters such as DG, DS and DH show spontaneity and endothermic nature of the process at all the concentration ranges studied (2-15 mg/dm 3 ). Desorption of metal ion from (CA/TPC) surface was carried out using 0.1 N nitric acid as an eluent under varying system pHs (1-6). Maximum desorption's for all the metal ions were observed at pH 1. The adsorption efficiencies of CA/TPC for the metal ions were maintained after four consecutive cycles of adsorption/desorption process. The loss in the dry weight of CA/TPC was not more than 10 % after each cycle of process. Due to easy and high regeneration properties of CA/TPC, it was found to be economical and have shown potential benefits in recovery of metal ions from wastewater.

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Multi-walled carbon nanotubes-ionic liquid-carbon paste electrode as a super selectivity sensor: Application to potentiometric monitoring of mercury ion(II)

Cited by 701 publications

References 39 publications

Site-specific functionalization for chemical speciation of Cr(III) and Cr(VI) using polyaniline impregnated nanocellulose composite: equilibrium, kinetic, and thermodynamic modeling

Site-specific functionalization for chemical speciation of Cr(III) and Cr(VI) using polyaniline impregnated nanocellulose composite: equilibrium, kinetic, and thermodynamic modeling

Sustainable conversion of agro-wastes into useful adsorbents

Use of cellulose acetate–tin (lV) phosphate composite (CA/TPC) in highly effective removal and recovery of heavy metal ions

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