Properties comparison of biochars from corn straw with different pretreatment and sorption behaviour of atrazine

Zhao, Xuchen; Ouyang, Wei; Hao, Fang; Lin, Chunye; Wang, Fangli; Han, Shen; Geng, Xiaojun

doi:10.1016/j.biortech.2013.08.042

Cited by 178 publications

(58 citation statements)

References 28 publications

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“…Many interactions, such as electrostatic interactions (Salvestrini et al 2010), hydrophobic effects and van der Waals forces (Tang et al 2012;Kulikova and Perminova 2002), p-p interactions (Zhao et al 2013), or hydrogen bonding (Welhouse and Bleam 1993;Kovaios et al 2006) have been reported to be involved in atrazine adsorption on various adsorbents. Atrazine is a weakly basic herbicide with a pK b of 12.3 (Table 1).…”

Section: Mechanism Of Atrazine Adsorptionmentioning

confidence: 99%

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

et al. 2015

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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.

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Section: Mechanism Of Atrazine Adsorptionmentioning

confidence: 99%

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

et al. 2015

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“…In view of these facts, it was considered worthwhile to develop fast, effective, economic and reproducible method for the subtraction of atrazine from water. The literature shows some adsorption methods for the removal of atrazine (Gai et al 2011;Zhang et al 2011;Chaparadza and Hossenlopp 2012;Báez et al 2013;Silva et al 2013;Zhao et al 2013;Yola et al 2014;Gupta et al 2015). It was observed that some methods work at extreme pHs, which are not suitable to work under natural water conditions.…”

Section: Introductionmentioning

confidence: 99%

Sorption, kinetics and thermodynamics studies of atrazine herbicide removal from water using iron nano-composite material

Ali

ALOthman

Warthan

2015

Int. J. Environ. Sci. Technol.

162

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Atrazine organic pollutant has been found in several water resources of the world. It is highly toxic and carcinogenic in nature. Atrazine is removed by adsorption on iron composite nanoparticles. The composite nanoparticles were synthesized, analyzed and applied for atrazine uptake from water. Residual atrazine was monitored by gas chromatography-mass spectrometry. The maximum atrazine removal (95 %) was achieved using contact time 30.0 min, concentration 30.0 lg/L, pH 7.0, dose 2.5 g/L and temperature 20.0°C. The adsorbent was selective for atrazine adsorption. The results obeyed Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms. DG°values were -6.05, -6.11 and -6.15 kJ/mol at 20, 25 and 30°C temperatures, respectively. The value of DS°w as -2.45 9 10 -3 kJ/mol K. It showed decline in entropy of atrazine uptake. The adsorption followed pseudo-second-order kinetics. The adsorption mechanism was liquid film diffusion. The proposed adsorption method is inexpensive, fast and reproducible. It can be used to remove atrazine from any water sample/source.

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“…Currently, some studies have shown that at contaminated sites biochar (BC) can be utilized as a measure of remediation to isolate pollutant and control contaminants migration in the soil, increasing soil pH (in acidic soils) and CEC, as well as enhance recycling of agricultural and forestry wastes. As a type of carbon-rich material with porosity [9], BC is combusted under low oxygen conditions and produced from biological remains, such as crop remains, timber and livestock waste. Simultaneously, several previous studies have shown that its physicochemical properties and pollutant retention ability can be affected by the source of material and productive process [10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

“…As a key procedure, adsorption controlled the devel-opment of hydrophobic organic compounds (HOCs) [9,16,17]. As one kind of HOCs, PBDEs have been mainly adsorbed by soils and sediments [18], however, these natural adsorbents were limited to utilize due to their low removal efficiency of PBDEs.…”

Section: Introductionmentioning

confidence: 99%

“…The lack of research has made it difficult to analyze sorption mechanisms clearly and accurately as well as execute related risk assessments efficiently. In this study, corn straw was chosen as the raw material to produce biochar due to its rich output in China, which is more than 0.2 billion tons per year [9]. Because tetra-BDE (BDE-47) is frequently detected in various environmental compartments, it was selected as a model PBDE for exploring the interaction with the obtained biochars.…”

Section: Introductionmentioning

confidence: 99%

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Role of Sorbent Surface Functionalities, Partition and Microporosity in 2, 2 ́, 4, 4 ́-Tetrabromodiphenyl Ether Sorption onto Biochars in a Single-Solute System

Yan¹,

Su²,

Ma³

et al. 2016

JRST

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a study was conducted to investigate the sorption behavior and mechanisms of 2, 2′, 4, 4′-tetrabromodiphenyl ether (BDe-47) onto a series of corn straw biochars pyrolysed at 300, 500 and 700°c (Bc300, Bc500 and Bc700). The micropore volume of Bc700 was 34 times higher than Bc300 and Bc500, which indicates that the biochar developed more high energy pore-filling adsorption sites and the carbonization was accelerated as pyrolytic temperatures increased,. The kinetics results showed that the fast sorption rate constants ranged from 4.01 h -1 to 6.62 h -1 while the slow sorption rate constants ranged from 0.18 h -1 to 0.40 h -1 . The fast sorption was attributed to the partitioning. The adsorption isotherm parameters indicate that the sorption mechanisms were different among the different biochars. For Bc300, partitioning was the main adsorption mechanism while for BC500, the pore-filling adsorption dominated the sorption progress at low concentration, while partitioning dominated at high concentration. The pore-filling adsorption dominated the entire sorption progress for BC700.

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Properties comparison of biochars from corn straw with different pretreatment and sorption behaviour of atrazine

Cited by 178 publications

References 28 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

Sorption, kinetics and thermodynamics studies of atrazine herbicide removal from water using iron nano-composite material

Role of Sorbent Surface Functionalities, Partition and Microporosity in 2, 2 ́, 4, 4 ́-Tetrabromodiphenyl Ether Sorption onto Biochars in a Single-Solute System

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