Nanjing University

Jiangsu Yongtai Environmental Science and Technology Co. Ltd.

Nanjing University-international Research Institute of Environmental Industries

Bingcai Pan

Weiming Zhang

Lu Lv

Quanxing Zhang

Hong Li

Wei Jiang

Shujuan Zhang

Wei Huang

Na Cheng

Wenbin Zhang

Ming Hua

Mengqi Shi

Tianrong Zhang

Lu Lyu

Jing Wang

Cheng Cheng

Lei Yang

Xiaolin Zhang

Xupeng Zong

Jie Rui

Qianlin Huang

Jingsheng Xu

Zhihao Hang

Yanying Chen

Yonghai Gan

Bo Kong

Yi Ren

Xiang Gao

Wenlan Yang

Yingnan Jiang

Linping Wang

Chenghan Ji

Mengshu Wang

Xitong Liu

Zhenmao Jiang

Siyuan Pan

Yingmei Xie

Yanyang Zhang

Chao Shan

Zefang Chen

You Xu

Siyu Lei

Zhichao Yang

The present disclosure provides a polyzirconium coagulant obtained by performing a controllable hydrolytic polymerization reaction on a simple zirconium salt. The polyzirconium coagulant has a good coagulation performance when removing turbidity, organic matter, phosphate, and fluoride from water body. The coagulation effluent has a low concentration of residual metal and a mild change of pH. At the same dose, compared with a simple zirconium salt and polymerized zirconium chloride with a low polymerization degree, the polyzirconium coagulant prepared by the present disclosure has a wider workable pH and dose range. Besides, compared with other metal salt coagulants, the coagulant prepared by the present disclosure has a better decontamination performance. In addition, by using the polyzirconium coagulant prepared by the present disclosure, the floc has a large size and is rapid to settle. The residual zirconium concentration is low, and pollutant removal efficiency is high.

Polyzirconium coagulant and application thereof

The present invention discloses a polymeric lanthanum nanocomposite, and a preparation method and application thereof and relates to the field of environmental functional materials. The preparation method includes the following steps: (1) mixing lanthanum chloride heptahydrate with concentrated hydrochloric acid and dissolving the mixture in alcohol, adding a resin polymer, and stirring at room temperature; (2) draining the resin after the stirring for use; (3) adding the resin to a precipitant solution, and stirring at room temperature and then filtering out the resin; and (4) washing the resin with water until the resin is neutral, adding a NaCl solution, stirring and then filtering out the resin, and drying to obtain the polymeric lanthanum nanocomposite. The prepared polymeric lanthanum nanocomposites have a relatively more uniform distribution, and show a higher phosphorus adsorption rate.

Polymeric lanthanum nanocomposite, and preparation method and application thereof

An adsorbent includes a porous substrate and a carboxylic acid dimer loaded onto the porous substrate. The carboxylic acid dimer is loaded on the surface or in the plurality of holes of the porous substrate. The average pore size of the porous substrate is not smaller than 2 nm. The carboxylic acid dimer is loaded onto the porous substrate by at least one of the following manners: a) the carboxylic acid dimer is loaded onto the porous substrate through a Si&#x2014;OH bond; b) the carboxylic acid dimer is loaded onto the porous substrate through the exchange between a carboxyl group and chlorine; c) the carboxylic acid dimer is loaded onto the porous substrate through the exchange between a carboxyl group and a hydroxyl group; and d) the carboxylic acid dimer is loaded onto the porous substrate through the coordination of a carboxyl group and aluminum or silicon.

Adsorbent comprising carboxylic acid dimer and preparation method thereof

Disclosed is a device for treating high-concentration organic wastewater by catalyst hydrothermal gasification, including a CHG reactor, a temporary wastewater storage tank and a condensing heat exchanger which are sequentially in loop connection. The CHG reactor includes a shell, a thermocouple, a water distribution device, and a packing support. The device of the present disclosure can quickly convert the high-concentration organic wastewater into clean energy or harmless gas at a low temperature under the action of a catalyst, so that the energy consumption of a treatment process is greatly reduced, and the treatment efficiency is improved. The device has potential application prospect.

Device for treating high-concentration organic wastewater by catalytic hydrothermal gasification

A mesoporous ozonation catalyst including a cerium-titanium-zirconium composite oxide. The catalyst is in the form of a solid spherical particle having a diameter of between 0.7 and 1.2 mm. The solid spherical particle exhibits lattice fringes under transmission electron microscope, and the lattice fringes have a spacing between 0.332 and 0.339 nm.

Mesoporous ozonation catalyst, preparation method thereof, and application method thereof

The present invention discloses a nanofiltration composite membrane, a preparation method and application thereof. The preparation method comprises: A) preparing 2D nano-material dispersion; B) first preparing a solution of a polymer material with a certain concentration, continuously adding a poor solvent under stirring conditions to subject the polymer material to chemical reaction to obtain a dispersion containing negatively charged polymer gel particles; C) subjecting the nano-material dispersion in step A) and the dispersion prepared in step B) to blending, membrane preparation and drying, and then placing the membrane into an alkaline solution with a certain concentration and pure water for soaking to obtain a nanofiltration composite membrane. The nanofiltration composite membrane can efficiently remove heavy metal complex ions through the synergistic effect of pore size screening and charge repulsion. Moreover, the rejection rate and flux of the nanofiltration composite membrane have not changed obviously after use for a long time.

Nanofiltration composite membrane, and preparation method and application thereof

The present invention discloses a nanocomposite membrane for heavy metal rejection and a preparation method thereof. The nanocomposite membrane comprises a porous membrane prepared from a two-dimensional sheet material and a hydrophilic inorganic nanomaterial distributed between the sheets of the two-dimensional material. The effective pore size of the nanocomposite membrane under wet conditions is not greater than 1.2 nm. The static water contact angle of the nanocomposite membrane is not greater than 45&#xb0;. The preparation method of the nanocomposite membrane comprises: adding reactants on both sides of a nanoporous membrane to carry out an interfacial synthesis reaction to obtain the nanocomposite membrane. The method is simple and controllable. Driven by lower pressure, heavy metal ions in water are rejected by a pore size screening function, thereby achieving the purpose of deep removal. The nanocomposite membrane can be used to quickly remove heavy metal ions from water.

Nanocomposite membrane for heavy metal rejection and preparation method thereof

A method of preparing a hybrid membrane, the method including: evenly mixing a granular material and a dispersant, to yield a dispersion solution; evenly mixing a polymer and an organic solvent, to yield a matrix solution; adding the matrix solution to the dispersion solution to yield a mixed solution; heating the mixed solution to remove the dispersant, to yield a casting solution; and coating the casting solution on a substrate, followed by removal of the organic solvent, to yield a hybrid membrane.

Method of preparing hybrid membrane

A resin nanocomposite, including a resin skeleton structure and nanoparticles. The resin skeleton structure is an aminated polystyrene. The nanoparticles are dispersed in the resin skeleton structure. The specific area of the nanocomposite is between 50 and 300 m/g, and the pore size thereof is between 5 and 40 nm. The invention also provides a method for preparing the resin nanocomposite, the method including: 1) mixing and dissolving a linear polyethylene with a chloromethyl polystyrene or a polyvinyl chloride to yield a polymer solution, and adding the nanoparticles to the polymer solution; 2) adding an alcohol solution to liquid nitrogen; adding the mixed solution dropwise to the liquid nitrogen to yield a mixture; allowing the mixture to stand; collecting, washing and drying resin beads to yield a composite material; and 3) adding the composite material to an amine solution for reaction, and washing and drying the resulting product.

Resin nanocomposite, method for preparing the same, and method for treating sewage with the same

A technological method for synthesizing optically pure L-/D-lactide by using a biogenic guanidine catalysis method. The method of the present invention comprises: by using biogenic guanidine creatinine (CR) as a catalyst and L-/D-lactic acid (90% of mass content) as a raw material, synthesizing optically pure L-/D-lactide by using a reactive reduced pressure distillation catalysis method. The method of the present invention has advantages that the used catalyst is biogenic guanidine creatinine and free of toxicity, metal, and cytotoxicity; the synthesized lactide is high in optical purity (the specific rotation of the L-lactide [&#x3b1;]25D=&#x2212;276&#x2dc;&#x2212;280, and the specific rotation of the D-lactide [&#x3b1;]25D=280), and does not contain any metal; the amount of the catalyst used in reaction is low, the technological process is simplified (a process for rectifying and purifying a crude lactide product by using a conventional method is avoided); and the technological method is simple and convenient to operate and easy in industrial implementation.

Technological method for synthesis of optically pure L-/D-lactide catalyzed by biogenic guanidine

The present invention discloses a method for advanced treatment of bio-treated coking wastewater. It employs polymeric ferric sulfate (PFS) and polyacrylamide (PAM) as the flocculant for the pre-treatment of bio-treated effluent. After the process of precipitation and filtration, the effluent is guided through an adsorption column filled with environmentally-friendly nano-composites whereby the advanced treatment of the bio-treated coking wastewater is achieved. When the absorption process reaches the breakthrough point, the adsorption operation will be stopped and sodium hydroxide solution is used as the desorption reagent for regenerating the nano-composites. The high-concentrated component of the desorption liquid is sent out for incineration or production of coal water slurry, meanwhile the low-concentrated component of the desorption liquid is used to prepare sodium hydroxide solution for the adsorption process of the next batch.

Advanced treatment method for biochemical tail water of coking wastewater

A method for synthesizing poly(butylene succinate-co-butylene adipate) (PBSA), including: a) adding raw materials including succinic acid, adipic acid, and 1,4-butanediol into a reaction still; increasing the temperature in the reaction still to 130&#xb0; C., and stirring the raw materials, then keeping the temperature in the reaction still at 170-200&#xb0; C., and dehydrating for 1-3 hours at atmospheric pressure, to yield an oligomer of PBSA; and b) decreasing the temperature of the reaction still to 100&#xb0; C., and adding a composite catalyst system, the total addition of the composite catalyst system accounting for one ten-thousandth to one ten-millionth of a total weight percentage of the raw materials; uniformly stiffing and mixing the composite catalyst system and reactants, slowly vacuum pumping the reaction still, heating the reaction still to a temperature of 200-240&#xb0; C. and allowing the composite catalyst system and the reactants to react for 10-20 hrs.

Method for synthesizing poly(butylene succinate-co-butylene adipate)

A method for regulating the structure and properties of the composite nanoabsorbent is provided. This method uses nanoporous chloromethylated polystyrene-divinylbenzene beads as the support material and adopts in situ precipitation method to load dissociative functional nanoparticles thereon; the composite nanoabsorbent of different absorption capacity and absorption speed can be prepared through regulating the pore structure, which is realized herein by means of starting crosslinking reactions through heating chloromethylated beads under existence of the swelling agent and the catalyst; through changing the proportions of different components in the reaction system, modes of heating and time of reaction, the polymer support with different pore structures can be prepared. This invention can successfully regulate the distribution and size of inorganic nanoparticles; the composite nanomaterials prepared by the resin of different degrees of crosslinking present different structures and properties, and the specific structure and properties can be selected in order to meet practical requirements.

Method for regulating the structure and properties of the composite nanoabsorbent

A highly active supported bimetallic nanocatalyst and its preparation method is disclosed. During the preparation, using an ion exchange or adsorption resin bearing basic functional groups as the support of the said catalyst, successively introducing the first metal precursor FeCland the second metal precursor (PdCl, NiClor CuCl) onto the resin through ion exchange process; then under the protection of nitrogen gas, simultaneously reducing the two metals with either NaBHor KBH; washing the resulting material with deoxygenated water and drying it, and the said catalyst is therefore obtained. The supported bimetallic material is characteristic of independent distribution of the two metals within the support. The independently distributed structure of the two metals enhances the catalytic efficiency of the second metal and the catalytic stability.

Supported bimetallic nanocomposite catalyst and the preparation method thereof

A method for treatment of dye wastewater by using ultraviolet-acetylacetone oxidation process is provided. This method belongs to the field of dye wastewater treatment, comprising the following steps: A) adding acetylacetone into dye-containing water, stirring and mixing them completely; B) putting the liquid obtained in step A) under ultraviolet irradiation till it is effectively decolorized. Provided is a new method for decolorizing high-concentrated dye wastewater on the basis of ultraviolet-induced oxidation process of phydroxyl radicals. This method can realize complete decolorization of the dye wastewater. During the oxidation process, the dye in the wastewater acts as the photosensitizer and can accelerate the decolorization process as the reaction progresses. The method can also improve BOD5/COD ratio from lower than 0.1 to higher than 0.3, which means that this method can be used not only for high-efficient decolorization of dye wastewater, but also as a preliminary step of microorganism treatment.

Method for treatment of dyeing wastewater by using UV/acetylacetone oxidation process

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Nanjing, China

Bingcai Pan