Estimation of the Uptake Rate Constants for Polycyclic Aromatic Hydrocarbons Accumulated by Semipermeable Membrane Devices and Triolein-Embedded Cellulose Acetate Membranes

Ke, Runhui; Xu, Yiping; Wang, Zijian; Khan, Shahamat U.

doi:10.1021/es060493t

Cited by 38 publications

(30 citation statements)

References 33 publications

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“…Compared with normal adsorbents such as activated carbon and alumina, this DNA matrix showed a selective adsorptivity for the dioxin derivatives with planar structure such as dibenzo-p-dioxin, dibenzofuran, and biphenyl. Some researchers (Xu et al, 2005b;Ke et al, 2006) prepared a new type of composite membrane, triolein embedded-cellulose acetate membrane (TECAM), and used it in the uptake of six organochlorine pesticides. Results indicated that TECAM quickly and efficiently accumulated hydrophobic organochlorine pesticides (OCPs) from water.…”

Section: Biomimetic Sorbent and Its Sorption Behaviors Of Persistent mentioning

confidence: 99%

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

2008

Journal of Environmental Sciences

388

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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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Section: Biomimetic Sorbent and Its Sorption Behaviors Of Persistent mentioning

confidence: 99%

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

2008

Journal of Environmental Sciences

388

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“…This indicates that TECAM sampling rates can be expected to decrease for some higher molecular weight OCPs. Indeed, our early results have also revealed that the k u s of PAHs decreased when logK ow exceeded approximately 6.0 [12].…”

Section: Determination Of Uptake Kinetic Parametersmentioning

confidence: 72%

“…Recently a novel membrane-based extraction technique was developed in our laboratory for in situ passive sampling of waterborne hydrophobic organic pollutants involving triolein-embedded cellulose acetate membrane (TECAM) [11,12]. In TECAM, the triolein drops embed in the matrix of cellulose acetate polymers and closely adhere with the polymers.…”

Section: Introductionmentioning

confidence: 99%

“…The use of TECAM as an extraction technique appears to have several advantages over conventional methods including low cost, simple preparation, less solvent-consumption, and simple pretreatment procedures [11]. Although the applicability of TECAM has been demonstrated for the analysis of OCPs and PAHs in aqueous samples [11,12], the intrinsic characteristic of TECAM for selectively extracting freely dissolved compounds has not yet been verified.…”

Section: Introductionmentioning

confidence: 99%

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Accurate quantification of freely dissolved organochlorine pesticides in water in the presence of dissolved organic matter using triolein-embedded cellulose acetate membrane

Wang

Huang

et al. 2007

Anal Bioanal Chem

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A novel method is described using trioleinembedded cellulose acetate membrane (TECAM) for accurate determination of the freely dissolved fraction of organochlorine pesticides (OCPs) in waters rich in dissolved organic matter (DOM). The performance of the method was tested with an air-bridge system for extracting OCPs from aqueous solutions with and without humic acid. In addition, the partition coefficients between humic acid and water (K doc s) for 20 OCPs were determined by TECAM with negligible depletion extraction. Results show that TECAM predominantly extracts the freely dissolved compounds and its extraction efficiency decreases significantly with an increase in concentration of humic acid in water. The proposed methodology is suitable for facile laboratory K doc measurement for moderate to high hydrophobic compounds (logK ow >4). The linear relationship between logK ow and logK doc obtained in this study agrees well with the results reported earlier. The kinetic uptake rate constants (k u s) and TECAM-water partition coefficients (K TECAM s) for the 20 OCPs were obtained using the controlled laboratory continuous-flow and static exposure system, respectively. These calibration parameters were used in the field experiment to estimate the freely dissolved concentrations of OCPs in the water of Taihu Lake in China. Our results show that TECAM can be used successfully to determine the freely dissolved OCPs in aquatic environments containing DOM, and the method is particularly suited for long-term water sampling.

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“…Semipermeable membrane devices (SPMD), which are based on the diffusion of hydrophobic substances from water to membrane bags filled with lipophilic phases, are widely used for monitoring organic contaminants in water (Huckins et al, 1990;Frank, 2005). It has also been reported that triolein embedded cellulose acetate (CA) membrane could quickly and efficiently accumulate hydrophobic POPs from water (Xu et al, 2005;Ke et al, 2006). In the present study, a novel composite absorbent containing the lipid triolein was designed using the concept of bioaccumulation and was used to remove trace level lipophilic organics from water.…”

Section: Introductionmentioning

confidence: 95%

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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Estimation of the Uptake Rate Constants for Polycyclic Aromatic Hydrocarbons Accumulated by Semipermeable Membrane Devices and Triolein-Embedded Cellulose Acetate Membranes

Cited by 38 publications

References 33 publications

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

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

Accurate quantification of freely dissolved organochlorine pesticides in water in the presence of dissolved organic matter using triolein-embedded cellulose acetate membrane

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

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