Showing papers in "Separation and Purification Technology in 2005"

TL;DR: In this paper, the dependence of the adsorption of fluoride on the pH of the solution has been studied to achieve the optimum pH value and a better understanding of the adorption mechanism.

TL;DR: Papaya wood was evaluated as a new biosorbent of heavy metals in this article, and the affinity of papaya wood to biosorb metals was in the order of copper(II)>cadmium(II),>zinc(II).

TL;DR: In this paper, a hollow fiber membrane contactor is used to separate CO2 from a gas stream, which is a promising alternative to conventional techniques such as column absorption, and the major advantages of the membrane absorption are the larger interfacial area, better device-modularity and more operational flexibility.

TL;DR: In this article, the application of chitosan-cellulose hydrogel beads as an adsorbent for Cu adsorption from aqueous solutions was examined.

TL;DR: In this article, a theoretical model was developed by simulating CO 2 absorption in water under two extreme operating conditions of the non-wetted and wetted modes of operation.

TL;DR: In this article, the performance of poly(ether block amide) (PEBA 2533) membranes was evaluated for the separation of binary acetone-butanol-ethanol (ABE) from dilute aqueous solutions by pervaporation.

TL;DR: In this article, the authors used an Amberlite XAD-16 resin vacuum-aspirated column to rapidly purify an aqueous extract of pomegranate husk to obtain high yields (58-60 g TPT/kg husk; time h).

TL;DR: In this paper, six types of activated carbons were prepared from coffee residues by varying activating agents of zinc chloride, nitrogen, carbon dioxide and steam, and the results showed that the coffee activated carbon prepared with ZnCl2 impregnation coupled with carbon dioxide activation (CZn N2 CO2) yields the highest total surface area (914 ± 21 m 2 /g) and total pore volume (1.010 ± 0.003 cc/g) with the hydrophilic functional groups on the surface adsorbed formaldehyde less than CZn

TL;DR: In this paper, the effect of the solution pH in the adsorption isotherm on natural and corncob modified with citric acid and nitric acid, respectively, was determined experimentally for Cd(II) ions were adsorbed mainly to the carboxylic sites.

TL;DR: In this paper, the potential of Chinese clinoptilolite for ammonia removal from aqueous solution was assessed and the effects of relevant parameters, such as contact time, pH and initial ammonia concentration, were examined, respectively.

TL;DR: In this paper, a combined electrocoagulation and electroflotation process was designed to reduce Cr 6+ to Cr 3+ first and then to remove the total Cr from wastewater to a value below 0.5

TL;DR: In this article, the authors look at how chitin/chitosan materials can contribute to the development of membrane-based processes, particularly to those classified as supportive of the sustainability of our life.

TL;DR: In this paper, the potential of cheap cellulose-containing natural materials like groundnut shells and sawdust was assessed for Cu(II), Ni(II) and Zn(II).

TL;DR: In this article, the authors used de-oiled soya as waste material and low cost adsorbent for the removal of toxic textile dye "malachite green" in order to mitigate many of our problems.

TL;DR: In this article, an analysis of pH influence, particle size, adsorbent weight, concentration and oxidation state of metal was carried out on cross-linked chitosan.

TL;DR: In this paper, the effect of tangential flow and crossflow on membrane fouling was analyzed by the resistance-in-series model where the reason for flux decline was subdivided into adsorption, concentration polarization, and reversible and irreversible fouling.

TL;DR: In this paper, an electrodialysis (ED) process was modeled based on basic electrochemistry rules and copper ion separation experimental data, which was found that performance of an ED cell is almost independent on the type of ions and only depends on the operating conditions and the cell structure.

TL;DR: In this article, the removal of arsenic and pesticides from natural ground water from the Slavonia region, Croatia, by two commercial nanofiltration membranes (NF270 and NFc) was investigated.

TL;DR: In this paper, anionic surfactant-modified alumina (SMA) was used for the removal of crystal violet (CV), a well-known cationic dye from aquatic environment.

TL;DR: In this article, the carbonaceous adsorbents with controllable pore sizes were prepared from carbonized fir wood (i.e., char) by KOH and steam activation.

TL;DR: In this paper, six species of green, brown and red seaweed were compared for their biosorption abilities in the uptake of cobalt and nickel from aqueous solutions containing 100mg/l initial metal concentrations.

TL;DR: The composite membranes prepared at various pre-polymer/cross-linker ratios have similar oil and/or PIB retention probably due to the high swelling of the silicone network, and the hexane permeability through all composites is higher than at ratio of 10/1.

TL;DR: In this paper, the authors focused on the concentration of 1/3 diluted skimmed milk (chemical oxygen demand, COD ≈ 36 g O2/L) to about 1/1 milk (volume reduction factor, VRF 3), with nine nanofiltration and reverse osmosis membranes by dead-end filtration.

TL;DR: In this article, a case study on recovery of 5-methyl-2-pyrazinecarboxylic acid (MPCA) by simultaneous MBSE and membrane-based solvent stripping shows potential of this process.

TL;DR: In this paper, a kinetic and equilibrium study of the sorption of lead(II) ions from water and wastewater by formaldehyde polymerized banana stem containing sulphonic acid groups was performed.

TL;DR: In this article, the NH 3 plasma treatment was applied to polypropylene hollow fiber microporous membranes (PPHFMMs) in a membrane bioreactor (MBR) for wastewater treatment.

TL;DR: In this article, the influence of four adsorbent preparation variables; hydration period (x 1 ), ratio of OPA to CaO/Ca(OH) 2 (x 2 ), amount of CaSO 4 (x 3 ) and CaO or Ca(OH 2 ( x 4 ) on the adsorbents surface area were studied using a 2 4 full factorial central composite design (CCD) in response surface methodology (RSM).

TL;DR: In this paper, the suitability of room temperature ionic liquids (RTIL) for the extraction of antibiotics from aqueous solutions was investigated and the NRTL model was employed to correlate the experimental data.

TL;DR: In this paper, a novel membrane bioreactor system with aerobatic granular sludge (MGSBR) was developed to treat municipal wastewater in which the main goal was to control the membrane fouling by changing the configuration of aerobic sludge, also to examine the feasibility of the MGSBR used to treat wastewater.

TL;DR: In this paper, the effect of the NaOH concentration in the solution on the formation of edta·Mg-Al LDH was examined to control the chemical species of the edta anion incorporated in the interlayer.