The adsorption of phosphamidon on the surface of styrene supported zirconium (IV) tungstophosphate: a thermodynamic study

The as-grown CNTs and graphitized CNTs were used as adsorbents to remove 1,2-dichlorobenzene from water. The experiments demonstrate that it takes only 40 min for CNTs to attain equilibrium and the adsorption capacity of asgrown and graphitized CNTs is 30.8 and 28.7 mg/g, respectively, from a 20 mg/l solution. CNTs can be used as adsorbents in a wide pH range of 3-10. Thermodynamic calculations indicate that the adsorption reaction is spontaneous with a high affinity and the adsorption is an endothermic reaction.

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“…The calculation methods employed are discussed in detail by Niwas. et al [16]. K 0 for the adsorption reaction can be defined as follows:…”

Section: Resultsmentioning

confidence: 99%

“…It is supported by the increasing adsorption of DCB with the increase in temperature. Since the free energy changes are negative and are accompanied by positive entropy changes, the reactions are spontaneous with a high affinity for DCB [16]. Adsorption isotherms of as-grown and graphitized CNTs at 25°C are plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of 1,2-dichlorobenzene from water to carbon nanotubes

Peng¹,

Li²,

Luan³

et al. 2003

Chemical Physics Letters

507

270

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“…Thermodynamic parameters, such as change in free energy (∆G 0 ), enthalpy (∆H 0 ), and entropy (∆S 0 ) were calculated from the variation of the thermodynamic equilibrium constant K 0 with the change in temperature. The calculation methods used were discussed in detail by Niwas et al (2000). A positive value of ∆H 0 indicated that the adsorption of dieldrin on CA-triolein sphere was endothermic.…”

Section: Sorption Behaviors Of Pops On Triolein-embedded Sorbentmentioning

confidence: 99%

Research progress of novel adsorption processes in water purification: A review

2008

Journal of Environmental Sciences

395

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As an effective, efficient, and economic approach for water purification, adsorbents and adsorption processes have been widely studied and applied in different aspects for a long time. In the recent years, a lot of novel adsorption processes have been developed for enhancing the efficiency of removing the organic and inorganic contaminants from water. This article reviews some new adsorbents and advanced adsorption methods that specialize in their compositions, structures, functions, and characteristics used in water treatment. The review emphasizes adsorption/catalytic oxidation process, adsorption/catalytic reduction process, adsorption coupled with redox process, biomimetic sorbent and its sorption behaviors of POPs, and modified adsorbents and their water purification efficiency.

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“…Thermodynamic parameters, such as the change in free energy (DG 0 ), enthalpy (DH 0 ) and entropy (DS 0 ), were calculated from the variation of the thermodynamic equilibrium constant K 0 with the change in temperature. The calculation methods employed are discussed in detail by Niwas et al (2000). The value of K 0 for the adsorption reaction can be defined as follows:…”

Section: Thermodynamic Analysis Of Pops Absorption On Ca-triolein Absmentioning

confidence: 99%

Removal of persistent organic pollutants from micro-polluted drinking water by triolein embedded absorbent

Liu

Jia

et al. 2009

Bioresource Technology

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a b s t r a c tA new biomimetic absorbent, cellulose acetate (CA) embedded with triolein (CA-triolein), was prepared and applied for the removal of persistent organic pollutants (POPs) from micro-polluted aqueous solution. The comparison of CA-triolein, CA and granular activated carbon (GAC) for dieldrin removal was investigated. Results showed that CA-triolein absorbent gave a lowest residual concentration after 24 h although GAC had high removal rate in the first 4 h adsorption. Then the removal efficiency of mixed POPs (e.g. aldrin, dieldrin, endrin and heptachlor epoxide), absorption isotherm, absorbent regeneration and initial column experiments of CA-triolein were studied in detail. The linear absorption isotherm and the independent absorption in binary isotherm indicated that the selected POPs are mainly absorbed onto CA-triolein absorbent by a partition mechanism. The absorption constant, K, was closely related to the hydrophobic property of the compound. Thermodynamic calculations showed that the absorption was spontaneous, with a high affinity and the absorption was an endothermic reaction. Rinsing with hexane the CA-triolein absorbent can be regenerated after absorption of POPs. No significant decrease in the dieldrin removal efficiency was observed even when the absorption-regeneration process was repeated for five times. The results of initial column experiments showed that the CA-triolein absorbent did not reach the breakthrough point at a breakthrough empty-bed volume (BV) of 3200 when the influent concentration was 1-1.5 lg/L and the empty-bed contact time (EBCT) was 20 min.

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The adsorption of phosphamidon on the surface of styrene supported zirconium (IV) tungstophosphate: a thermodynamic study

Cited by 136 publications

References 5 publications

Adsorption of 1,2-dichlorobenzene from water to carbon nanotubes

Adsorption of 1,2-dichlorobenzene from water to carbon nanotubes

Research progress of novel adsorption processes in water purification: A review

Removal of persistent organic pollutants from micro-polluted drinking water by triolein embedded absorbent

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