The invention provides an industrially advantageous method for producing a crystalline silicotitanate having high adsorption/removal capabilities for cesium and strontium in seawater. The method includes a first step of mixing a silicic acid source, a sodium compound, titanium tetrachloride, and water to prepare a mixed gel and a second step of hydrothermal reaction of the mixed gel prepared in the first step to produce crystalline silicotitanate of formula: Na.sub.4Ti.sub.4Si.sub.3O.sub.16.nH.sub.2O (wherein n represents 0 to 8). In the first step, the silicic acid source, sodium compound, and titanium tetrachloride are mixed in such a mixing ratio that the resulting mixed gel may have a Ti to Si molar ratio, Ti/Si, of 1.2 to 1.5 and an Na.sub.2O to SiO.sub.2 molar ratio, Na.sub.2O/SiO.sub.2, of 0.7 to 2.5.

Structured adsorbent beds comprising a high cell density substrate, such as greater than about 1040 cpsi, and a coating comprising adsorbent particles, such as DDR and a binder, such as SiO.sub.2 are provided herein. Methods of preparing the structured adsorbent bed and gas separation processes using the structured adsorbent bed are also provided herein.

Methods and devices for providing dialysis treatment are provided. The device comprises a cartridge for providing regenerative dialysis, the cartridge comprising: a body having an inlet and an outlet and defining an interior, the interior including at least a layer comprising urease, a layer comprising zirconium oxide, a layer comprising zirconium phosphate, and a layer comprising carbon, wherein at least two of the layers are blended together to provide a gradient of the two materials.

Adsorbents of varying types and forms are described, as usefully employed in gas supply packages that include a gas storage and dispensing vessel holding such adsorbent for storage of sorbate gas thereon, and a gas dispensing assembly secured to the vessel for discharging the sorbate gas from the gas supply package under dispensing conditions thereof. Corresponding gas supply packages are likewise described, and various methods of processing the adsorbent, and manufacturing the gas supply packages.

The invention is directed to ion capture devices and methods for ion capture.

The present disclosure is directed to methods for scrubbing low levels of urea from aqueous solutions such as a dialysate from dialysis, and including blood and blood products, and devices capable of employing these methods.

To provide a material capable of adsorbing lead from water with a pH of 8 or more. A porous body of a titanium-containing compound, which has a bulk specific gravity of 0.4 g/cm.sup.3 or less, is used as an adsorbent.

To provide a heavy metal adsorbent in which elution of aluminum from a zeolite is suppressed. A compound, which is a hydrous oxide or a hydroxide of Si, Ti, Zr, Ce or La, is mixed with the zeolite.

A sorbent cartridge device includes an ion-exchange material containing zirconium phosphate and no more than about 0.1 mg of leachable phosphate ions per about 1 g of the ion-exchange material. In one example, the cartridge also includes a phosphate-adsorbing material containing zirconium oxide. In this example, the weight ratio between zirconium phosphate and zirconium oxide in the cartridge is from about 10:1 to about 40:1. The zirconium phosphate may be alkaline zirconium phosphate prepared by a process including the following steps: (i) drying acid zirconium phosphate to obtain a dry acid zirconium phosphate; (ii) combining the dry acid zirconium phosphate with an aqueous solution to obtain an aqueous slurry; and (iii) combining the slurry with an alkali hydroxide to obtain the alkaline zirconium phosphate. During step (ii), any free phosphate ions in the dry acid zirconium phosphate leach out into the aqueous phase of the slurry.

The disclosure relates to wastewater treatment technologies, and particularly to an adsorbent and its preparation method and application. The adsorbent includes titanium hexametaphosphate; the titanium hexametaphosphate is mainly prepared from hexametaphosphate and titanium salt. The adsorbent is an aggregate of micron or nanometer particles, with a large surface area and a good adsorption performance. The adsorbent, as a wastewater treatment agent, may effectively remove thallium contaminants in various water bodies such as underground water, surface water, chemical wastewater and mine wastewater at a removal rate of 99.8%; and the adsorbent has a good removal capability for heavy metals in water such as cadmium, plumbum, copper, stibium, cesium and uranium. The adsorbent has a wide applicable PH value range, and especially has a good adsorption capacity, stability and heat resistance under acidic conditions. The preparation method is simple to operate, low in reaction condition requirements and low in cost.