Ceramic sorbents

Yang, Z. Lin, Y.S. Equilibrium of oxygen sorption on perovskite type ceramic sorbents. AIChE J. 2003, 49, 793-798. 

Yang, Z.H. Lin, Y.S. High temperature oxygen sorption in fixed-bed packed with perovskite-type ceramic sorbents. Ind. Eng. Chem. Res. 2003, 42, 4376 381. 

Gordina, N.E., Prokofev, V.Y., and ITin, A.P. (2005) Extrusion molding of sorbents based on synthesized zeolite. Glass Ceram., 62 (9-10),... 

Typical n-alkyl ligand densities that can be achieved with -alkylchlorosi lanes are within the range of 2.5-3.2pmolm-2, whilst with disilazanes, ligand densities approaching the limited values can be reached under optimized conditions, i.e. between 3.50 and 4.20 pmolm-2. Surface-modified zirconia or other metal oxide based RPC sorbents can be similarly prepared by either of the above two strategies. Compared to n-alkylsilicas, these ceramic RPC sorbents show different selectivities with synthetic peptides, as well as different chemical stability profiles. Consequently, RPC sorbents based on these types on surface-modified, porous metal oxide materials fulfill useful and complementary roles, but at this point in time, have achieved a more limited range of applications for the resolution of synthetic peptides due to their limited availability. 

Ceramic dosimeter Various solid sorbent materials Microporous ceramic material PAHs, BTEX, chlorinated hydrocarbons Integrative sampling in groundwater Up to 1 year Solvent extraction or thermal desorption 54... 

Among the kinetic sampling devices, ceramic dosimeters have been used successfully for the long-term surveillance of VOCs.92 They use a ceramic tube as the diffusion-limiting barrier that encloses a receiving phase consisting of solid sorbent beads. Over a three-month deployment in a contaminated aquifer, the ceramic dosimeter provided TWA concentrations of benzene, toluene, ethylbenzenes, xylenes, and naphthalenes. The levels obtained matched closely those found in spot water samples that were taken frequently over the trial period.54... 

A novel approach using the sorbent phase directly (with no extraction) in contact with cell lines from rainbow trout liver was developed by Schirmer et al.114 and Bopp et al.115 The cell lines were used to detect EROD activity from specific PAHs. A modified ceramic dosimeter (Toximeter sampler containing Biosilon 160-300 pm diameter polystyrene beads as the sorbent phase) was deployed for extended periods in groundwater known to be contaminated by PAHs. The response obtained using the cell lines incubated with Biosilon beads correlated with the concentrations of PAHs known to have EROD-inducing activity. The system is versatile as other cell lines can be used depending on the toxicological response of interest. 

Stengl, V. Bakardjieva, S. Marikova, M. Subrt, J. Oplustil, F. Olsanska, M. Aerogel nanoscale aluminum oxides as a destructive sorbent for mustard gas. Ceramics-Silikaty 2003, 47 (4), 175-180. 

In this chapter, we present the results of computational studies on the above mentioned novel inorganic systems namely AlPOs, carbon nanotubes and supercritical fluid extraction from the adsorbed phase over ceramics. Multi-technique computational methods such as Computer Graphics (CG), molecular mechanics (MM), quantum chemistry (QC) and molecular dynamics (MD) were applied. The attempts made to design synthetic sorbents at molecular level are reviewed. 

Hydroxyapatite Hydroxyapatite, which has the formula of Cajo(P04)6 (0H)2, is widely used as a sorbent for hydrophobic interaction chromatography. Hydroxyapatite is an underivatized matrix with a specific inherent surface functionality. In the 1980s, it had been introduced as ceramic beaded material with good physical strength (Kato, Nakamura, and Hashimoto, 1987). The interactions of the surface phosphate and caldum-ions with the amino and carboxyl groups of proteins are complex and not fully understood. The elution of proteins is typically... 

Matrix solid phase dispersion (MSPD) is an effective sample preparation technique that combines extraction and purification in one step. Barker et al. defined MSPD procedures as those that use dispersing sorbents with chemical modification of the silica surface (e.g.. Cl8, C8). Samples are blended and dispersed on particles (diameters of 40-100 p.m) using a glass or agate mortar and pestle (Pig. 4.3). The use of ceramic or clay mortars and pestles can result in loss of analytes. A disadvantage of the method is the traditionally high sorbent sample ratios... 

Zaspalis, V., Pagana, A., Sklari, S. 2007. Arsenic removal from contaminated water by iron oxide sorbents and porous ceramic membranes. Desalination 217 167-180. 

Since the sublimation rate can be increased by a higher heating rate only to a certain extent, the rate of water vapor removal from the sublimation front becomes the key point in freeze drying. Adsorption of water vapor by sorbents placed inside a drying chamber or by direct contact of the sorbent and drying material (as a mixture) is one of the most promising methods in this area. Molecular sieves, zeolites, or ceramics can be recommended here because their sorption activity under rarefied conditions does not drop with temperature rise due to the heat of sorption. The use of particulate sorbents permits sublimation to take place in a fluidized state under atmospheric pressure [67,68]. 

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