Temperature dependence of the point of zero charge of oxidized and non-oxidized activated carbons

Álvarez-Merino, M.A.; Fontecha-Cámara, M.A.; López-Ramón, M.V.; Moreno‐Castilla, Carlos

doi:10.1016/j.carbon.2008.02.002

Cited by 55 publications

(35 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Surface area and porosity of this sample were previously studied, finding BET surface area of 1636 m 2 /g, external surface area of 94 m 2 /g, micropore volume of 0.71 cm 3 /g, and mean micropore width of 1.80 nm. The total oxygen content from the amounts of CO and CO 2 evolved up to 1273 K determined by temperature-programmed desorption was 18% [9]. A scanning electron microscopy (SEM) micrograph of ACC-ox is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption mechanisms of metal cations from water on an oxidized carbon surface

Moreno‐Castilla

Álvarez-Merino

Pastrana‐Martínez

et al. 2010

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

“…Surface charge of ACC-ox as a function of solution pH was determined at 288 and 308 K by potentiometric titration, as described elsewhere [9], using an automatic titrator (Metrohm 702 Titrino). The equilibration and titrations were performed under a nitrogen atmosphere cover to eliminate the influence of atmospheric CO 2 .…”

Section: Methodsmentioning

confidence: 99%

Adsorption mechanisms of metal cations from water on an oxidized carbon surface

Moreno‐Castilla

Álvarez-Merino

Pastrana‐Martínez

et al. 2010

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

“…The pH at which the surface charge is zero, is called the PZC. The surface is positively charged at pH\pH PZC and negatively charged at pH [ pH PZC (Liu et al 2010;Dabrowski et al 2005;Á lvarez-Merino et al 2008). The degree of ionization of phenol is also pH dependent (Kennedy et al 2007).…”

Section: Effect Of Initial Phmentioning

confidence: 99%

“…2 Effect of TCAC dosage for phenol removal at pH = natural, C o = 100 mg/l, t = 4 h, T = 30°C Fig. 3 Effect of pH for phenol removal onto TCAC at t = 24 h, C o = 100 mg/l, T = 30°C Appl Water Sci (2012) 2:317-326 321 Merino et al 2008). The pH at which the surface charge is zero, is called the PZC.…”

Section: Effect Of Initial Phmentioning

confidence: 99%

“…The PZC is defined as the pH at which the carbon surface has no charge in the absence of specific adsorption. The carbon surface is positively charged at pH values below the pH PZC and negatively charged at pH values above the pH PZC (Á lvarez-Merino et al 2008). The limiting pH of solution is considered on the basis of pH PZC (Singh et al 2008a, b).…”

Section: Adsorbent Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Removal of phenol from aqueous solution using carbonized Terminalia chebula-activated carbon: process parametric optimization using conventional method and Taguchi’s experimental design, adsorption kinetic, equilibrium and thermodynamic study

Khare

Kumar

2012

Appl Water Sci

View full text Add to dashboard Cite

In the present paper, the phenol removal from wastewater was investigated using agri-based adsorbent: Terminalia chebula-activated carbon (TCAC) produced by carbonization of Terminalia chebula (TC) in air-controlled atmosphere at 600°C for 4 h. The surface area of TCAC was measured as 364 m 2 /g using BET method. The surface characteristic of TCAC was analyzed based on the value of point of zero charge. The effect of parameters such as TCAC dosage, pH, initial concentration of phenol, time of contact and temperature on the sorption of phenol by TCAC was investigated using conventional method and Taguchi experimental design. The total adsorption capacity of phenol was obtained as 36.77 mg/g using Langmuir model at the temperature of 30°C at pH = 5.5. The maximum removal of phenol (294.86 mg/g) was obtained using Taguchi's method. The equilibrium study of phenol on TCAC showed that experimental data fitted well to R-P model. The results also showed that kinetic data were followed more closely the pseudo-first-order model. The results of thermodynamic study showed that the adsorption of phenol on TCAC was spontaneous and an exothermic in nature.

show abstract

Differential roles of ash in sorption of triclosan to wood‐derived biochars produced at different temperatures

et al. 2020

View full text Add to dashboard Cite

Biochar is composed of carbonaceous and inorganic (ash) fractions. The structural properties of carbonaceous fractions and the composition of ash in biochar are both variable with pyrolysis temperature. However, it is unknown whether ash may play different roles in sorption of organic compounds to the carbonaceous fraction of biochars produced at different temperatures. Hence, in this study, the pristine biochars produced at 300–900°C and their corresponding deashed biochars were investigated, and the combined roles of carbonaceous fraction and ash in sorption of triclosan were compared. The results showed that the biochars produced at 300–400°C had high content of uncarbonized organic structure with dominating partition effect. The combination of uncarbonized organic structure and ash had comparable or even higher sorption coefficient (KD) for triclosan at low concentration compared with a single uncarbonized organic structure. However, for the biochars produced at 600–900°C, which were mainly composed of carbonized or graphitized carbon structure, ash had significant effect on triclosan sorption by reducing surface adsorption and pore filling effect. The combination of carbonaceous fraction and ash decreased KD values for triclosan at any tested concentrations. In addition, the results of pH effect on sorption indicated that ash possibly decreased the electrostatic repulsion of deprotonated phenolic hydroxyl between biochars and triclosan. Accordingly, it will be more valuable to design biochars for pollutant sorption from the perspective of combined role of carbonaceous fraction and ash rather than a single role of carbonaceous fraction.

show abstract

Temperature dependence of the point of zero charge of oxidized and non-oxidized activated carbons

Cited by 55 publications

References 37 publications

Adsorption mechanisms of metal cations from water on an oxidized carbon surface

Adsorption mechanisms of metal cations from water on an oxidized carbon surface

Removal of phenol from aqueous solution using carbonized Terminalia chebula-activated carbon: process parametric optimization using conventional method and Taguchi’s experimental design, adsorption kinetic, equilibrium and thermodynamic study

Differential roles of ash in sorption of triclosan to wood‐derived biochars produced at different temperatures

Contact Info

Product

Resources

About