Sorption of atrazine on conventional and surface modified activated carbons

Chingombe, P.; Saha, Basudeb; Wakeman, R.J.

doi:10.1016/j.jcis.2006.06.065

Cited by 182 publications

(104 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Considering the superior behavior of HAC N 2 in the adsorption of atrazine, an AC with a highly basic surface but free of heteroatom-containing surface functional groups is the most favorable for the removal of atrazine from aqueous solution. This finding is in agreement with the observed enhanced adsorption of atrazine by activated carbon annealed in a hydrogen flow (Chingombe et al 2006).…”

Section: Equilibrium Adsorption Of Atrazinesupporting

confidence: 92%

“…Nevertheless, hydrophobic interactions cannot be excluded in the adsorption of atrazine on HACs. As previously mentioned, polar oxygen and nitrogen groups on the carbon surface can act as water binding centers and facilitate the formation of water clusters, which may reduce the accessibility of adsorption sites to atrazine because of atrazine's hydrophobicity (Chingombe et al 2006). Considering that HAC N 2 is characterized by the highest adsorption capacity among the studied HACs, the increased hydrophobicity of the AC surface caused by removing acidic functionalities may be a key factor for the excellent adsorption of atrazine from aqueous solution.…”

Section: Mechanism Of Atrazine Adsorptionmentioning

confidence: 90%

“…Chen et al (2009) reported that intraparticle diffusion was not the sole rate-controlling step of atrazine adsorption on oxidized MWCNTs. Chingombe et al (2006) applied the Boyd kinetics equation to identify the slowest step of the process and concluded that the adsorption of atrazine onto modified ACs is controlled by a film diffusion mechanism. Figure 4 shows the Weber and Morris plots for atrazine uptake on the studied HACs.…”

Section: Kinetics Of Adsorptionmentioning

confidence: 99%

“…Chingombe et al (2006) studied the effect of heat treatment of commercial AC (F400) in nitrogen and ammonia atmospheres on the removal of atrazine from aqueous solution. In a similar report by Mazet et al (1994), the sorption performance of the same adsorbent was studied.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Adsorption of atrazine on hemp stem-based activated carbons with different surface chemistry

et al. 2015

View full text Add to dashboard Cite

Surface-modified hemp stem-based activated carbons (HACs) were prepared and used for the adsorption of atrazine from aqueous solution, and their adsorption performance was examined. A series of HACs were prepared by potassium hydroxide activation of hemp stems, followed by subsequent modification by thermal annealing, oxidation with nitric acid and amination. The resultant HACs differed in surface chemistry, while possessing similar porous structure. The surface group characteristics were examined by X-ray photoelectron spectroscopy and measurement of the point of zero charge (pH PZC ). The adsorption of atrazine from aqueous solution was performed in static conditions. The Langmuir-Freundlich and Langmuir models gave a better fit for equilibrium isotherms compared with the Freundlich model. The atrazine adsorption process was controlled by an intraparticle diffusion mechanism with a significant contribution from film diffusion. The presence of oxygen and nitrogen functionalities on the carbon surface was found to be undesirable for atrazine adsorption. The superior adsorbent was obtained by heat treatment of HAC in an inert atmosphere at 700°C, resulting in a very high adsorption capacity due to its enhanced hydrophobicity. The adsorption of atrazine on the studied HACs mainly involves p-p dispersive interactions between the atrazine ring and the graphene layers of carbon.

show abstract

Section: Equilibrium Adsorption Of Atrazinesupporting

confidence: 92%

Section: Mechanism Of Atrazine Adsorptionmentioning

confidence: 90%

Section: Kinetics Of Adsorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adsorption of atrazine on hemp stem-based activated carbons with different surface chemistry

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Silver-loaded activated carbons, silver-loaded activated carbon fibers (Ag-ACFs) [13][14][15], and silver-loaded carbon aerogels [16] not only keep the excellent adsorption capacity of porous carbon materials, but also endow them with antibacterial activity. Nanocarbon materials such as carbon nanotubes (CNT) [17,18] and graphene [19][20][21][22] have also been investigated as silver-carrying antibacterial agents.…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticles-Loaded Exfoliated Graphite and Its Anti-Bacterial Performance

Hou

Huang

et al. 2017

Applied Sciences

View full text Add to dashboard Cite

Abstract:One antibacterial material was prepared from exfoliated graphite (EG) decorated with silver nanoparticles (AgNPs). The EG was prepared by the graphite intercalated compound process, AgNPs were prepared by chemical reduction of AgNO 3 in the presence of NaBH 4 . The AgNPs-loaded EG (Ag-EG) composite was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), nitrogen adsorption, mercury intrusion porosimetry, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The antibacterial effect of the Ag-EG was evaluated by using the zone of inhibition method. The loaded AgNPs were highly dispersed on EG sheets and most of them have a size less than 10 nm. The Ag loading slightly increased the surface area of EG. It is shown that the Ag-EG had antibacterial activity and anti-adhesion properties against Pseudomonas aeruginosa and Staphylococcus aureus. It suggests that Ag-EG composites could be used in a variety of industrial applications that require an antibacterial effect.

show abstract

Effect of solution pH and influence of water hardness on caffeine adsorption onto activated carbons

et al. 2014

View full text Add to dashboard Cite

There has been little research into the effects of the water hardness and pH of surface waters on the adsorption of caffeine on activated carbons. The aim of this study was to determine the influence of these water characteristics on different activated carbons. Caffeine adsorption from the aqueous phase was studied using biomass derived activated carbons (DD: dende coco and BB: babassu coco) and a commercially available activate carbon (NO: Norit® GAC 1240 plus). The functionalized carbons in an inert atmosphere was also studied and were denominated DI, BI, NI. Results highlight the importance of pH in caffeine adsorption: the highest removals were obtained for pH 3.0 and decrease for higher pH. The adsorption isotherms obtained were fitted to the Freundlich and Langmuir models. Calcium and magnesium ions were adsorbed to a varied extent on the activated carbons. The hardness in solution decreased their adsorption due to a competition effect. KF and qm from the Freundlich equation linearly decreased with water hardness due to salt‐screened electrostatic repulsions between charged molecules. The amount adsorbed from deionized water was largest because there was no competition between inorganic ions and molecules.

show abstract

Sorption of atrazine on conventional and surface modified activated carbons

Cited by 182 publications

References 26 publications

Adsorption of atrazine on hemp stem-based activated carbons with different surface chemistry

Adsorption of atrazine on hemp stem-based activated carbons with different surface chemistry

Silver Nanoparticles-Loaded Exfoliated Graphite and Its Anti-Bacterial Performance

Effect of solution pH and influence of water hardness on caffeine adsorption onto activated carbons

Contact Info

Product

Resources

About