30results about How to "No change in adsorption" patented technology

The invention relates to the technical fields of pollution control and waste water treatment, in particular to a geopolymer-based composition and its preparation method and application. The present invention discloses a geopolymer-based composition made from the following precursor components: metakaolin, alkaline activator and surfactant. The geopolymer-based composition is environmentally friendly, recyclable, and reusable. The geopolymer-based composition is modified by a surfactant, so that the geopolymer-based composition has an increased adsorption capacity for heavy metal anions, and the adsorption performance for heavy metal cations is basically unchanged.

The invention belongs to the technical field of papermaking industry and specifically relates to a papermaking wastewater treatment process. Papermaking wastewater is treated by using a coagulation-microelectrolysis-two-stage UASB-biological contact oxidation-ion exchange-activated carbon-ultraviolet disinfection combined process, so that refractory organic matters, suspended matters, SS and microorganisms in the treated papermaking wastewater are efficiently removed. Meanwhile, resin is rapidly regenerated within a short period by using a regeneration solution provided by the invention, and the attenuation of the resin can be delayed due to the addition of sophorolipids and trehalose ester in the regeneration solution, so that the service life of the resin is greatly prolonged, the wastewater decoloration efficiency is increased, and the operation cost is reduced.

The invention relates to a preparation method and application of molybdenum and nitrogen-doped lignocellulose composite nano-adsorption materials, comprising the following steps: (1) Lignocellulose is calcined in an ammonia atmosphere, cooled naturally and then ground to obtain nitrogen-doped lignocellulose Cellulose; (2) Dissolve ammonium molybdate in deionized water to form solution I; (3) Dissolve thioacetamide in deionized water to form solution II; (4) Mix solution I and solution II thoroughly , prepared into solution III; (5) Nitrogen-doped lignocellulose was added to solution III, and stirred to obtain solution IV; (6) Solution IV was transferred to a high-pressure reactor for high-temperature reaction; (7) After the high-temperature reaction solution IV was cooled, The reaction product is centrifuged to obtain molybdenum and nitrogen doped lignocellulose composite nanometer adsorption material. According to the invention, the molybdenum and nitrogen doped lignocellulose composite has good adsorption effect on hexavalent chromium, and its adsorption performance remains basically unchanged after repeated tests, and has good stability.

The invention relates to a cationic organic polymer which is obtained by performing a polymerization reaction on a compound containing imidazole groups or pyridine groups and halohydrocarbon in an organic solvent at the temperature of 0-300 DEG C for 0-24h, wherein the ratio of the imidazole or pyridine groups to halogens is 1: 1; the compound containing the imidazole groups or pyridine groups isselected from the following chemical formulas; R1 is an imidazole group or pyridine group, and m, n, p and r are independently selected from integers that are greater than 0; the halohydrocarbon is selected from the following chemical formulas; X is independently selected from F, Cl, Br or I, and m is any integer which is 0 or greater. The invention also discloses application of the cationic organic polymer prepared by the preparation method, which serves as an HTcO4 radical and / or a perrhenic acid radical, in an adsorbent.

The invention discloses a low-density self-forming graphite adsorption material for treating oil and polymer organic matter pollution of a water body and a preparing and recycling method of the low-density self-forming graphite adsorption material. The preparing and recycling method comprises the following preparation steps: firstly, uniformly stirring flake graphite, concentrated sulphuric acid and a hydrogen peroxide mixture in an environment of smaller than or equal to 10 DEG C; secondly, transferring the obtained mixture to a die with a specific shape, and standing at room temperature to obtain an expanded graphite forming body; thirdly, baking the expanded graphite forming body and recycling sulfuric acid. The graphite adsorption material prepared by the invention has the characteristic of self forming under the condition of room temperature without addition of a binder or extrusion and has very high adsorption performance for oil and organic solvents; the density of the adsorption material is smaller than or equal to 0.1 g / cm<3>. According to the preparing and recycling method disclosed by the invention, the sulfuric acid is recycled at low temperature while an expanded graphite adsorption material is prepared; the problem of environmental pollution caused by treatment of acid-containing wastewater in a traditional method of preparing expanded graphite is avoided. The adsorbed oil and organic solvents have excellent regenerating and reusing properties after extrusion or suction filter recovery.

The invention discloses a regeneration method of an adsorption medium and a de-coloring treatment method of printing and dyeing wastewater. The regeneration method comprises: a regeneration solution flows through the adsorption medium; the adsorption medium is ion exchange resin or / and macro-porous adsorption resin; the regeneration solution is prepared from the following components: NaCl with the mass percent of 2 percent to 8 percent, NaOH with the mass percent of 2 percent to 8 percent and rhamnolipid with the concentration of 100ppm to 300ppm. According to the de-coloring treatment method provided by the invention, the adsorption medium is regenerated through adopting the regeneration method. According to the regeneration method of the adsorption medium, provided by the invention, the resin is rapidly regenerated in a short period through adopting the special regeneration solution and the service life of resin de-coloring is greatly prolonged; the wastewater de-coloring efficiency is improved and the operation cost is reduced; after 1500BV wastewater is treated through the resin, the adsorption performance basically has no changes and the de-coloring efficiency can reach 80 percent or above for a long period.

The invention discloses a double-metal composite N-pentylimidazole thiocyanate ionic liquid and its preparation method and its application in CO treatment. , magnesium thiocyanate, heated and stirred to obtain a homogeneous liquid, which can still maintain a liquid state at room temperature; the bimetallic N-pentylimidazole thiocyanate ionic liquid can selectively absorb CO, and has a The equilibrium absorption capacity reaches 0.229mol / mol composite ionic liquid, and has good CO cycle absorption performance, in CO absorption and CO / N 2 The field of separation materials has a good application prospect.

The invention discloses a modified chitosan quaternary ammonium salt and an application thereof. The modified chitosan quaternary ammonium salt uses absolute ethanol as a dispersant and glutaraldehyde as a crosslinking agent. Sugar quaternary ammonium salt is prepared by cross-linking reaction. The modified chitosan quaternary ammonium salt of the present invention is added to the wastewater containing perchlorate ions, and the perchlorate ions in the water body are removed through the adsorption reaction of the modified chitosan quaternary ammonium salts to the perchlorate ions . The modified chitosan quaternary ammonium salt of the invention has simple preparation method, mild conditions, easy operation, and the adsorption capacity of perchlorate ions is far greater than that of active carbon. The modified chitosan quaternary ammonium salt of the present invention can be regenerated and reused only by soaking in sodium chloride solution, and the adsorption performance of the regenerated modified chitosan quaternary ammonium salt remains basically unchanged.

The invention belongs to the field of chelate resin materials and provides a salicyhydroximic acid type chelate resin and a preparation method thereof for solving the problem that the existing hydroximic acid can not be repeatedly used in sewage treatment. The preparation method comprises that a ligand salicyhydroximic acid is bonded to the surface of a chloromethylated polystyrene microsphere to obtain the salicyhydroximic acid type chelate resin, and bonding quantity of the ligand salicyhydroximic acid is 0.38-0.43g / g. The salicyhydroximic acid type chelate resin has strong coordination complexing power to metal ions, can realize enrichment recycling of multiple precious metal ions, especially has excellent adsorbability and selectivity to heavy metal ions such as copper, nickel, lead, iron, zinc and chromium and can be effectively applied to treatment of sewage in the industries such as electroplating, electronics and heavy metals and extraction of rare earth minerals; besides, the bonding quantity of salicyhydroximic acid is high, a synthetic process is simple, conditions are mild, time is short, and synthesis is easy to control; and the chelate resin provided by the invention is convenient to use and easy to separate and recycle and can be recycled for 10 times while the adsorbability is basically constant.