Chinese Academy of Sciences

Xiaosong He

Beidou Xi

Mingxia Zheng

Jing Su

Yuanyuan Sun

Guangchun Shan

Minda Yu

Yiming Zheng

Hangzheng Zhao

Hongbao Liu

Xuemei Fu

Jun Cui

Xuhui Mao

Hongyu Ding

Jiaxin Cui

A silicified modified zero-valent iron, whose surface layer is a silicon-containing oxide layer formed by silicate, which is obtained by the following method: dissolved silicate and micron iron powder are used as raw materials and mixed in proportion, and ball milling under an inert gas atmosphere to obtain the silicified modified zero-valent iron. The invention also discloses the application of silicified modified zero-valent iron in repairing polluted water bodies. The invention uses green silicate as silicon source to carry out surface silicification modification of micron zero-valent iron, which has simple operation, low cost and is convenient for large-scale production. Moreover, the prepared silicified zero-valent iron has good dispersibility, high reduction activity and strong recycling performance, and can be used for the treatment of various polluted water bodies and soil.

Silicified modified zero-valent iron and its preparation method and application

The disclosure is a method for recovering groundwater contaminated with organic phenols. The method includes the step of injecting a remediation agent into the groundwater extracted from the stratum to be rehabilitated or ex-situ extracted, followed by the step of injecting manganese-based oxidant. By adding a suitable proportion of soluble silicon to the water to be treated as a remediation agent, the efficiency of manganese-based oxidant in the treatment of phenolic pollutants is enhanced based on interface properties and stability of various manganese oxides in the regulating and recovering process. The method for recovering groundwater contaminated with organic phenols provided by the disclosure has a simple process and is convenient to operate, the adopted chemicals are inexpensive and easy to obtain, cause little corrosion to the injection equipment, and has a wide range of applications in practice. The adopted oxidant will not produce halogenated toxic by-products during the treatment process.

Method for recovering groundwater polluted by organic phenols

A visible light catalyst, its preparation method, a visible light catalyst activated persulfate system and its use. The visible light catalyst includes a carbon material, a transition metal compound and a coating material. The carbon material is conductive carbon material, and the transition metal compound is selected from one or more of transition metal oxides, transition metal sulfides, and acid or salt compounds containing a transition metal. The visible light catalyst has high visible light photocatalytic activity and performance of degrading organic pollutants and activating persulfate which can result in synergistically degrading degradation-resistant organic pollutants.

Visible light catalyst, preparation and application thereof

Provided are a rapid detection method for a condition of landfill leachate polluting groundwater and an application thereof. The rapid detection method includes: carrying out fluorescence detection on groundwater in a specific region of a landfill, and determining whether the groundwater is polluted according to a ratio of fluorescence intensities at specific excitation/emission wavelengths in a specific fluorescence region. The rapid detection method provided by the solution establishes characteristic fluorescence spectrum regions, fluorescence intensities and regular characteristics thereof of organic matters in leachate-polluted groundwater of a landfill in a fluorescence spectrum region, and can achieve the rapid detection of a condition of landfill leachate polluting groundwater by means of a portable fluorescence detector on site. The detection method provided by the solution is characterized by rapid detection, no need of chemical reagents, simple operation, high detection sensitivity and lower cost.

Rapid detection method for condition of landfill leachate polluting groundwater and application thereof

A method for repairing an organic polluted site includes the following steps: step 1, build a sunlight greenhouse; step 2, carry out pretreatment to the soil of the organic polluted site; step 3, perform a biological heap treatment on the pretreated soil; step 4, implement quality control on the biological heap for soil remediation. By constructing a sunlight greenhouse within the original site of organic pollution sites, placing a biological heap in the sunlight greenhouse for a biological heap treatment, using the heat accumulated in the sunlight greenhouse to promote the volatilization of volatile organic matters in the soil without causing secondary pollution, and meanwhile adding a microbial agent and a nutritional agent to the polluted soil to promote the degradation and conversion of adsorbed organic matters.

Polluted site by thermal decomposition at normal temperature combined with biological heap

Growing community of inventors

Beijing, China

Xiaosong He