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.

A permanently porous vanadium(II)-containing metal-organic framework (MOF) with vanadium(II) centers and methods for synthesis of such MOF frameworks are provided. Methods for using such compounds to selectively react with N.sup.2 over CH.sub.4 are provided. In the synthetic methods, a vanadium source, such as VY.sub.2(tmeda).sub.2, where Y is a halogen and tmeda is N,N,N′,N′-tetramethylethane-1,2-diamine and a H.sub.2(ligand) are reacted in the presence of acid in a solvent at between 110° C. and 130° C. to form an intermediate product. The intermediate product is collected and washed with a washing agent, such as DMF and acetonitrile, and the vanadium(II) based MOF is activated by heating the washed intermediate product to at least 160° C. under dynamic vacuum.

A mobile phase including a lithium salt flows through a stationary phase including an oxygenated metal compound with affinity to the lithium salt through a Lewis acid-Lewis base interaction so that the oxygenated metal compound captures the lithium salt through the Lewis acid-Lewis base interaction. An eluent flows through the stationary phase to release the lithium salt captured by the oxygenated metal compound into the eluent. The eluent includes a Lewis base or a Lewis acid that disrupts the Lewis acid-Lewis base interaction between the lithium salt and the oxygenated metal compound. The eluent including the released lithium salt is collected after the eluent flows through the stationary phase.

A porous formed article includes an organic polymer resin and an inorganic ion adsorbent and having the most frequent pore size of 0.08 to 0.70 μm measured with a mercury porosimeter. Such a porous formed article can be prepared by crushing and mixing a good solvent for the organic polymer resin and the inorganic ion adsorbent to obtain slurry; dissolving the organic polymer resin and a water-soluble polymer in the slurry; shape-forming the slurry; promoting coagulation of the shape-formed product by controlling the temperature and humidity of a spatial portion coming into contact with the shape-formed product, until the shape-formed product is coagulated in a poor solvent; and coagulating the coagulation-promoted shape-formed product in a poor solvent. A production apparatus can be used to prepare such a porous formed article.

The production of an oxygen-absorbent composition is provided, having: (a) a porous silica encapsulation matrix; and (b) a composition containing an oxygen-absorbent compound selected from fatty acids, unsaturated esters or compounds containing same, and, optionally, a catalyst based on an inorganic salt of a transition metal, wherein the composition (b) is encapsulated in the porous silica matrix (a). The composition can form part of the structure of the packaging for oxidation sensitive products or be placed in the surrounding atmosphere to reduce the concentration of oxygen. A method for encapsulating the active compound or the active compound together with a catalyst, and subsequently incorporating same into polymer matrices is also provided.

The present invention discloses a method for separating propylene, propyne, propane and propadiene from mixed gas, wherein, comprising: a high purity component can be obtained as metal-organic frameworks as adsorbents through adsorptive separation and purification of a mixed gas containing propylene, propyne, propane and propadiene a general structural formula of the metal-organic framework material is [M(C.sub.4O.sub.4)(H.sub.2O)].1.5H.sub.2O, wherein M is metal ions, the metal-organic framework material is a three-dimensional network structure formed by transition metal ions or alkaline earth metal ions and squaric acid through coordination bonds or intermolecular forces. The metal-organic framework materials of the present invention exhibit excellent adsorption and separation performances for propylene, propyne, propane and propadiene. The cheap and available raw materials for the synthesis, simple operation, and low cost make it cost-efficient for preparation of such metal-organic frameworks. Besides, the good regeneration and repeatability, the adsorption performances kept intact with that of the original one after being activated under vacuum for several times, indicating that they have a great promising and potential for industrial application.

Provided is an absorption method of an element belonging to periods 4 to 6 and groups 3 to 15 of the periodic table. The method includes: preparing mesoporous alumina that satisfies at least one of the following items: (1) a surface hydroxyl content is 3.5 mmol/g or more; (2) a low-temperature CO.sub.2 desorption amount in CO.sub.2 thermal desorption amount spectrometry is 5 .Math.mol/g or more; and (3) a low-temperature NH.sub.3 desorption amount in NH.sub.3 thermal desorption amount spectrometry is 25 .Math.mol/g or more; and bringing a liquid containing an absorption target element in contact with the mesoporous alumina to absorb the absorption target element in the mesoporous alumina. The absorption target element is at least one type selected from the group consisting of an element belonging to periods 4 to 6 and groups 3 to 15 of the periodic table.

The present application relates generally to filter media useful for manufacturing air filters for residential and commercial office's Heating, Ventilation, and Air Conditioning (HVAC), particularly to filters and filter media comprising soybean-based materials. The present invention provides an inexpensive, effective, environmentally friendly, and sustainable media for manufacturing HVAC air filters for residential and commercial buildings.

Disclosed are an aluminum-based lithium ion-sieve (LIS), and a preparation method and use thereof. The aluminum-based LIS is Li.sub.2SO.sub.4.Math.2Al(OH).sub.3.Math.nH.sub.2O coated with Al(OH).sub.3, where n is 1 to 4. The preparation method includes: reacting an aluminum salt and a lithium salt with an alkali to obtain an adsorbent intermediate LiOH.Math.2Al(OH).sub.3.Math.nH.sub.2O; using a dilute sulfuric acid to obtain an aluminum-based lithium adsorbent Li.sub.2SO.sub.4.Math.2Al(OH).sub.3.Math.nH.sub.2O; and filtering out and washing the adsorbent, mixing the adsorbent with a metaaluminate, and adjusting a pH to obtain the Li.sub.2SO.sub.4.Math.2Al(OH).sub.3.Math.nH.sub.2O coated with Al(OH).sub.3. The aluminum-based LIS of the present disclosure has the advantages of high adsorption capacity and prominent stability, and can be used to efficiently recover low-concentration lithium in industrial wastewater. Moreover, the LIS is coated with aluminum hydroxide, which can effectively protect the structure from being corroded.

A method for preparing a filling material includes: dissolving FeCl.sub.3.Math.6H.sub.2O and an imprinted molecule in water to form a reaction solution; adding DMF to the reaction solution and stirring for dissolution; adding BDC to the reaction solution and stirring for dissolution; soaking PC into the reaction solution and stirring; and treating the reaction solution by a hydrothermal method to remove a molecule of an additive decomposition product and prepare the filling material imprinted with a casting structure of the molecule of additive decomposition product. The present invention can effectively and selectively adsorb the additive decomposition products and achieve the effects of effectively removing the additive decomposition products, preventing the decomposition products from being mixed in an electrodeposition film of the copper, realizing the uniform distribution of current on the cathode and the anode, improving the quality and preparing an electrolytic copper foil for high-frequency signal transmission.