Guangdong Institute of Eco-environmental Science & Technology

Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences

Guangdong Institute of Eco-environment and Soil Sciences

Guangdong Institute of Eco-environmental China Science & Technology

Guangdong Inst. of Eco-environmental Science&tech

Fangbai Li

Chuanping Liu

Jianghu Cui

Liping Fang

Chengshuai Liu

Xiangqin Wang

Xianghua Xu

Tongxu Liu

Kai Liu

Wei Wu

Qing Chun Li

Huimin Li

Jiangtao Qiao

Yahui Lv

Xingwen Lu

Fei Wu

Kaimin Shih

Disclosed are a carbon-based microorganism electronic diverter material and a preparation method and use thereof. The preparation method may include the following steps of (1) bringing a porous carbon material and dopamine to reaction to obtain a dopamine modified porous carbon material; and (2) bringing the dopamine modified porous carbon material and resazurin to reaction to obtain the carbon-based microorganism electronic diverter material. The carbon-based microorganism electronic diverter material prepared by the disclosure has a capability of storing charges, and is capable of intercepting electrons in a microorganism-driven reduction process of dissimilatory arsenic and iron, and remarkably reducing arsenic reduction and release in a rice field flooding process.

Carbon-based microorganism electronic diverter material and preparation method and use thereof

The present disclosure discloses a method for targeted regulation of soil microbes to synchronize heavy metal/metalloid transformation and greenhouse gas emission reduction and use. The present disclosure discovers that by compounding methionine with an organic acid salt, the obtained formulation can significantly increase the ability of the soil microbes to promote arsenic methylation in a targeted mode, and meanwhile, and the methane production is effectively reduced in the presence of the methionine. In the present disclosure, the methionine/organic acid salt formulation is further loaded into a modified biochar material of a porous structure, so as to achieve the effect of slow release. The method of the present disclosure may effectively reduce absorption of inorganic arsenic by rice, achieve a significant reduction in the proportion of inorganic arsenic in the total arsenic in the rice and inhibit methane emission of the soils and reduce methane emission at the same time.

Method for targeted regulation of soil microbes to synchronize heavy metal/metalloid transformation and greenhouse gas emission reduction and use

An iron-carbon composite material and a preparation method thereof are disclosed. The iron-carbon composite material includes a three-layer core-shell structure, which successively includes a porous graphite carbon outer layer, an iron carbide intermediate layer and a nano zero-valent iron core from outside to inside. The present invention wraps nano zero-valent iron in porous graphite carbon and iron carbide, which can prevent the oxidation of nano zero-valent iron, while iron carbide effectively improves the ability to fix arsenic, realizing high efficiency and long-term use of nano zero-valent iron. Iron carbide may effectively adsorb and fix arsenic, and especially efficiently oxidize As(III) to relatively low-toxic As(V).

Iron-carbon composite material, preparation method thereof and use therefor

An on-site heavy metal contaminated soil treatment apparatus, comprising a sampling system, a molding system, a heat processing system and a tail gas processing system disposed in sequence. The sampling system includes a bucket elevator and a planetary stirring device which are connected in sequence and are disposed on a mobile platform of the sampling system. The apparatus is easy to move and assemble, has a small floor area, and can be built on a target contaminated site, reducing transportation costs and the risk of secondary contamination. The entire process performed by the apparatus proceeds automatically, reducing labor costs. The planetary stirring sampling method and automatic brick blank extrusion molding process of the apparatus are applicable to various types of heavy metal contaminated soil providing high processing efficiency and good molding effect. Combined microwave heating and high-temperature steam heating provide rapid heating, small thermal inertia, and easy temperature control.

Site heavy metal contaminated soil treatment equipment and treatment method therefor

The present invention discloses a method for safe production of rice on soil mildly and moderately polluted by heavy metals. The method includes applying a passivator before transplanting rice seedlings to reduce activity of heavy metals in soil, and then spraying a foliar barrier from the peak tillering stage to the booting stage of rice and at the filling stage of rice; the passivator includes bentonite, gypsum powder, lime, a biochar, an iron-based biochar, a slow-release iron-based biochar, an iron-sulfur-silicon composite biochar, a heavy metal cadmium passivator and a cadmium-arsenic synchronous passivator for activating sulfur reducing bacteria in paddy soil; and the foliar barrier includes an acid silica sol, a selenium-silicon composite sol, a cerium composite silica sol, a ferrous modified selenium sol. The method can also include applying a nitrate nitrogen fertilizer at the seedling stage of rice, and/or applying a phosphorus potassium fertilizer at the tillering stage of rice.

Method for safe production of rice soil mildly and moderately polluted by heavy metals

A ferrous modified selenium sol for inhibiting accumulation of cadmium and arsenic in rice and the preparation method and application thereof are disclosed. The method includes: dissolving an iron-containing compound and a selenium-containing compound into water; adding a reductant to the solution, and stirring until no more precipitation is generated, then adding carbonate, continuing to stir until no more precipitation is generated, and then filtering, taking the precipitation, and washing to obtain the precipitation of the selenium element and ferrous carbonate; adding an emulsifier to a citric acid buffer solution to obtain an emulsified citric acid buffer solution; adding the precipitation of the selenium element and ferrous carbonate to the emulsified citric acid buffer solution to obtain a sol system; and evaporating to concentrate the sol system, and adjusting the pH to 4.5-8.5 to obtain a ferrous modified selenium sol for inhibiting the accumulation of cadmium and arsenic in rice.

Ferrous modified selenium sol for inhibiting accumulation of cadmium and arsenic in rice and preparation method and application thereof

The invention discloses a method for the preparation and use of a slow-release iron-based biochar soil heavy metal passivator. The slow-release iron-based biochar soil heavy metal passivator of the present invention is prepared by an one-step method, wherein iron-based biochar, kaolin and a biological starch are mixed into a core material in a specific ratio; an acidic silica sol and a chitosan solution are prepared, under the effects of an alkaline catalyst and an emulsifier, as a chitosan and silica-sol composite material as a coating, and the iron-based biochar is coated with the alkaline coating material, with the core material and the coating material being controlled at a certain volume ratio. The passivator has a wide raw material source, a simple and convenient preparation process, easy industrialized production, and can passivate the heavy metal arsenic and cadmium efficiently and inhibit the absorption and accumulation of arsenic and cadmium. The passivator prepared by the present invention can last for 4 growing seasons and has a higher passivation efficiency and a longer action time than common iron-based biochar passivators. The passivator can be widely used in the control of arsenic and cadmium pollution farmland.

Preparation and use of slow-release iron-based biochar soil heavy metal passivator

The present invention relates to the field of environmental protection, and in particular to a leaf surface barrier for accurately controlling cadmium absorption and transport related gene expression in rice, and an application thereof. The present invention comprises: reducing a raw material, i.e., selenious acid or selenite, by using ascorbic acid to generate a nanogel, and then emulsifying the nanogel for peptization to obtain a leaf surface barrier for accurately controlling cadmium absorption and transport related gene expression in rice; and then mixing the leaf surface barrier with a silica sol to obtain a composite selenium and silica sol leaf surface barrier. The present invention also provides a leaf surface barricading method for accurately controlling cadmium absorption and transport related gene expression in rice. By applying the leaf surface barrier, the silica sol or the composite selenium and silica sol leaf surface barrier having a particular atomization degree and a particular concentration by means of foliar spray during a particular growth period of rice and within a particular time, the cadmium accumulation in rice can be effectively reduced. Applying the present invention to a moderately or lightly polluted field can enable cadmium content in rice to satisfy the food hygiene standards, and therefore is significant for achieving the safe use of the large area of field polluted by heavy metal cadmium in China.

Foliage blocking agent for precise regulation of expression of cadmium absorption and transportation-related gene in rice and application thereof

A heavy metal cadmium deactivator for activating the activity of sulfur-reducing bacteria in rice field soil, and an application thereof. The deactivator is constituted by electron shuttles alone or electron shuttles and electron donors, but cannot be constituted by electron donors alone. The mass ratio of the electron donors to the electron shuttles is (1:3)-(1:8). Also, a heavy metal cadmium deactivating method for activating the activity of microorganisms in rice field soil, such as sulfur-reducing bacteria. By applying the functional deactivator to rice field soil, the activity of microorganisms, such as sulfur-reducing bacteria, can be activated, thereby accelerating the reduction process of sulfur and iron in soil to facilitate the fixation of cadmium; cadmium adsorption and accumulation in rice is reduced to achieve secure production in fields moderately or lightly polluted by cadmium.

Heavy metal cadmium deactivator for activating activity of sulfur-reducing bacteria in rice field soil, and application thereof

A method for preparing the iron-based biochar material, the iron-based biochar material prepared there from and a method for controlling the heavy metal pollution in soil using the iron-based biochar material. For the iron-based biochar material of the present invention, by using a method of high-temperature carbonization, a biomass is used as a raw material and an iron-containing compound is add in the process of preparing biochar, wherein iron is incorporated in a specific ratio, to form the iron-based biochar material with a special structure and function. The material has a simple preparation process, low cost and a short production period; the prepared iron-based biochar material has an unique effect on the arsenic-cadmium combined pollution soil remediation, can effectively reduce the bioavailability of arsenic and cadmium in the soil, significantly reduces the arsenic and cadmium contents in the agricultural products planted in the arsenic-cadmium combined pollution soil, and has no toxic and side effects on the crops, is safe to apply and can be applied to the control of arsenic-cadmium combined pollution soil in a large scale.

Iron-based biochar material, preparation therefor and use thereof in soil pollution control

A method for preparing an iron silicon sulfur multi-element composite biochar soil heavy metal conditioner, including: adding silicate to agricultural wastes and roasting with air isolated to enable silicate to enter structural pores of biochar; enabling iron-containing slats to gather on kaolinite with a given proportion; enabling sulfate to gather on bentonite with a given proportion; mixing the above three materials evenly according to a given proportion; and adding diatomite and starch to the mixture, and pelleting to prepare the iron silicon sulfur multi-element composite biochar soil heavy metal conditioner. The conditioner can be widely applied in soil heavy metal pollution abatement of rice fields, and it is able to synchronously passivate composite pollutants in acid or alkaline soils to reduce the amount of pollutants absorbed by and accumulated in rice, thereby achieving safe utilization of polluted farmland.

Method for preparing iron silicon sulfur multi-element composite biochar soil heavy metal conditioner

The present invention discloses a selenium-doped nano-silica sol capable of both inhibiting the absorption and accumulation of heavy metal in rice and producing a selenium-rich rice, and a preparation method thereof. The selenium-doped nano-silica sol of the present invention is prepared mainly by using a nano-silica sol as a carrier, sodium selenite and the like as a raw material, vitamin C and the like as a reducing agent, and polyvinylpyrrolidone and the like as an emulsifier, and doping and dispersing selenium in a specific ratio in a silica sol so as to form a selenium-doped nano-silica sol with a special structure and function. The selenium-doped nano-silica sol prepared according to the invention has high stability and high concentration, and is uniform and transparent, and has a silica content of up to 20% or more, a selenium content of up to 1% or more, and low impurity content. The selenium-doped nano-silica sol of the present invention has a pH close to neutral, wherein selenium, in a nano particle form, is dispersed in colloidal silica, with a particle size of less than 50 nm; and after the foliar application, it can significantly promote the growth of crops, inhibit the absorption and accumulation of arsenic and cadmium in crops, and increase the selenium content in crops, and has no toxic and side effects on crops, and is safe to application.

Selenium-doped nano silica sol used for producing selenium-enriched rice and capable of suppressing absorption and accumulation of heavy metals in paddy rice and preparation method therefor

A method for recovering lead from lead-containing discarded electronic waste cathode ray tube glass includes the steps of taking a sample of cathode ray tube lead-containing funnel glass, crushing to obtain CRT glass powder, then uniformly mixing zero-valent iron powder with the CRT glass powder according to the mass ratio of 0.1-1.5:1, performing heat preservation at a temperature of 610-960&#xb0; C. for 3-180 min, and further cooling to extract the metallic lead from a SiOreticular glass structure of the CRT glass. This can be applied to pretreatment of the lead-containing waste CRT glass, and the metallic lead is extracted from the reticular silicate structure of the lead-containing waste CRT glass by adding the zero-valent iron in the thermal treatment process so that disposal rate of electronic wastes is improved and ecological safety is ensured. This method has important environmental, social and economic significance and broad application prospects.

Method for recovering lead from lead-containing discarded electronic waste cathode ray tube glass

The present invention is related to the field of environmental protection, more specifically, to a foliage silicon fertilizer and a method for production of the fertilizer, which is a molybdenum-silica compound sol used for reducing heavy metal and nitrates in vegetables. The fertilizer, which is a molybdenum-silica compound sol, comprises 10-25 wt % silica, 0.05-5.5 wt % molybdenum ions. More preferably, the fertilize, which is a rare earth-molybdenum-silica compound sol, comprises 10-25 wt % silica, 0.05-5.5 wt % molybdenum ions and 0.1-7.5 wt % rare earth ions. By the combination of silica with molybdenum in the present invention, it is effective for preventing the absorption/accumulation of nitrates in vegetables. In addition, by the further combination with rare earth element, the prevention ability of the fertilizer from absorbing heavy metal and nitrates into vegetables is even enhanced. With a preparation method with normal pressure and relatively, low temperature, that is, with mild condition, simple process and high operability, large scale production of the present invention may be readily executed.

Composite foliage Si fertilizer for lowering contents of heavy metals and nitrate in vegetable, and preparation method thereof

A method for producing high-active titanium dioxide anatase hydrosol by using metatitanate as precursor, is characterized in comprising the following steps in order: (1) Wash process: adding alkali to wash so as to remove sulfate ion; (2) Dispersion process: adding acid to disperse the filter cake and obtaining a uniform suspension; (3) Peptization process: peptizing the suspension obtained in dispersion process according to the method of (a), (b) or (c). When producing transition metal or rare earth doped anatase hydrosol, transition metal or rare earth salt solution with a predetermined concentration is first prepared, and then added into the metatitanate suspension which has not been washed by alkali. Subsequently, the resulting suspension is filtered and washed until no sulfate ion is present. When producing precious metal deposited anatase hydrosol, precious metal solution is added into prepared pure anatase hydrosol, and then, the resulting solution is irradiated with ultraviolet light for 0.5-10 hours under stirring continuously. The advantages and beneficial effects of the present invention are as follows: (1) the raw material has low price and little pollution as well as abundant source; (2) the hydrosol has excellent degree of dispersibility and higher anatase crystallization; (3) the hydrosol has higher activity under visible light irradiation owing to doping/depositing technique; (4) the properties and activity of the hydrosol can be further enhanced by using post disposal, such as microwave and ultrasonic technique; and (5) the hydrosol is a kind of nano-material with about 10 nm particle size. The anatase hydrosol can be applied for indoor air purification, crop disease control, odor control and so on.

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Guangzhou, China

Fangbai Li