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This paper briefly describes the mechanism of phytoremediation, the advantages and the application of ornamental woody plants. Based on the article analysis, it is found that the concept of hyper accumulation has been emphasized too much in the study of phytoremediation, the usage of herbal hyper-accumulator plants can not last for a long period in field level as the economic benefits is fairly low. Thus, the outstand advantages of ornamental woody plants are outlined, such as more biomass, casier management, pollution remediation and improvement of cultural environments. Relevant studies of remediation by ornamental woody plants are focused on variety, absorption characteristics and resistance assessment. Conclusion: ornamental woody plants show strong resistance and significant ability of metal adsorption. Ornamental woody plants have great potential in remediation of heavy metal comminuted soil. In the future, the theory of resistance and absorption should be strengthened. Other studies are also important, such as expanding the types of ornamental woody remediation plants and screening out more economic and effective plants. As a result, more and more ornamental plants will be put into practice in remediation. [ABSTRACT FROM AUTHOR]

The living environment of animals， plans and human beings has been seriously threatened by soil heavy metal pollution， so it’s urgently needed for cheap and efficient materials and methods to reduce their flow and migration. In this paper， soil column experiment was conducted to study the stabilization effect of hydroxyapatite（HAP)and the mixture of hydroxyapatite and fly ash （HAP+FA） on lead（Ⅱ)and cadmium(Ⅱ)in contaminated soil. It is indicated that the soil pH increased slightly with the addition of HAP and HAP+FA, and the concentration of heavy metals in the leachate was shown in this order: CK（without stabilizer） ＞ HAP+FA＞ FA. The migration of heavy metals in the soil treated with stabilizer was lower than that without stabilizer treatment. The stability efficiency of HAP was 7.5% and 2.79% higher than that of HAP+FA in lead-contaminated soil with initial concentration of 400mg/kg and 800mg/kg， respectively， and 2.5% and 0.51% higher than that of HAP+FA for cadmium-comtaminated soil with initial concentration of 400mg/kg and 800mg/kg， respectively. The stability efficiency of HAP for lead and cadmium is slightly higher than that of HAP+FA, and there was a better efficiency for the same concentration of lead of the same amount of stabilizer. [ABSTRACT FROM AUTHOR]

This paper reviews the application of silica nanomaterials in the field of heavy metals, and mainly introduces the progress and development trend of mesoporous silica nanomaterials, functional group modified silica nanomaterials and composite silica nanomaterials. Silica nanomaterials have the advantages of low cost, high specific surface, good stability and multiple modification ways, which are important development direction of heavy metal pollution control. This work also analyzes the future development trend and potential value of silicon dioxide nanomaterials, and puts forward some opinions and suggestions on the solutions to the technical problems still existing in the application of silicon dioxide nanomaterials in the field of heavy metals. [ABSTRACT FROM AUTHOR]

Due to the rapid development of industry and agriculture in China, the pollution emission problems caused by farmland heavy metal pollution intensified. Heavy metal pollution in farmland is easy to cause crop reduction, soil environment, harm to human health and other adverse effects. This paper introduced the main sources of heavy metal pollution in farmland and its harm to crops and human bodies, and analyzed the characteristics of heavy metal pollution in farmland in the north and south of China. Based on the analysis and summary of the passivation restoration technology of the typical heavy metals Cu, Zn, Cd, Ni, Pb, Cr, As and Hg in farmland and the passivation restoration technology of the composite pollution of a variety of heavy metals in farmland, combined with the research status, the combination of restoration technology, space technology and evaluation method is proposed. In order to provide reference for the blunt repair of heavy metal pollution in farmland soil, it can be more effectively repaired, tested and evaluated. [ABSTRACT FROM AUTHOR]

Combined with the existing research, the research progress of biochar remediation of heavy metal pollution is reviewed. This paper focuses on the mechanism of biochar immobilization of heavy metals in soil, the effect of biochar on the absorption of heavy metals by plants, the research results of the application of biochar in field engineering, and the risks and shortcomings o£ biochar as a soil improver. Finally, it is hoped that on the premise of meeting safe production, the popularization of biochar should be promoted in agricultural production, rather than limited to scientific research. Start the life cycle assessment of biochar and establish a biochar life cycle database to provide a comprehensive and effective scientific basis for the future use of biochar. [ABSTRACT FROM AUTHOR]

Taking the heavy metal pollution caused by metal mining as the starting point, this paper fully analyzes several commonly used typical heavy metal pollution remediation measures, obtains their advantages and disadvantages, and gives reasonable suggestions. It is concluded that a variety of remediation methods should be combined in the future remediation process of soil heavy metal pollution, so as to be able to repair contaminated soil more reasonably. [ABSTRACT FROM AUTHOR]