Black carbon adsorbent to remove organic pollution in water

   In recent years, the level of China's industrial and socio-economic high-speed development, environmental protection, pollution control work has failed to keep up with the many domestic and industrial wastewater directly into nearby water bodies without any treatment of the water environment pollution is more serious, especially organic pollutants in water content increased, more and more complex components.

       At present, China's water organic micro-worsening pollution, (eg polycyclic aromatic hydrocarbons 〈PAHs〉, PCBs 〈PCBs〉, aromatic nitro compounds), pose a serious threat to the safety of drinking water and human health. Of more concern is that the current water treatment technology is still difficult to effectively remove such organic pollutants. Therefore, it is looking for cost-effective, the new adsorbent suitable for drinking water treatment has become one of the focus of attention of the field of Environmental Science and Engineering.

       National Natural Science Foundation funding, Zhejiang University Department of Environmental Science Professor Chen Baoliang pine needles as biomass representatives prepared by controlling the carbonization temperature (100 to 700 ?C), a series of biological carbon adsorbent, and preparation The biological carbon adsorbent structure and surface characteristics of the depth study. 4 - nitrotoluene explore adsorbent adsorption properties of organic pollutants in water, the quantitative relationship between the mechanism and its structural features provide efficient adsorbent for the preparation of the economy as well as to predict the adsorption properties and mechanism theoretical basis.

       Chen Baoliang study group selected pine needle litter as biomass representative to carry out related research.

       He explained that forest fires often coniferous trees at the expense of pine needles as one of the typical deciduous forest, dry, highly flammable, biological carbonaceous massive accumulation in the soil, an important source of soil carbon black. Using limiting oxygen temperature carbonization prepared a series of biological carbon adsorbent. The specific approach is changed by controlling the different carbonization temperature, making the preparation of biological carbonaceous component. With increasing carbonization temperature, the carbon content increases from 50.34% (100 ?C) rose to 84.61% (700 ?C); hydrogen and oxygen content dropped to 1.25% from 6.09% and 42.87% and 13.04% .

       The study found that the carbonization temperature of 100 ?C when prepared sample was highly polar and fatty, with increasing carbonization temperature, biological carbon adsorbent aromatic sharp increase in its polarity is drastically reduced. Reduced polarity and aromatic increases, the mean biological carbonaceous gradually transition from the "soft-matter" to "hard carbonaceous. At the same time, the surface area of ??the sample regularity. Visible, the temperature can be regulated biological carbonaceous surface structure and the nature of their adsorption characteristics and mechanism, which will have a major impact.

       4 - nitrotoluene for adsorption goal, Chen Baoliang different sorbent performance a comparative study found that low-temperature biological carbon adsorbent (100 ?C) mechanism for the allocation of the role of temperature obtained biological carbon The mechanism of action of the adsorbent (300 ?C) for the distribution function and surface adsorption interaction, the mechanism of high-temperature biological carbon adsorbent (700 ?C) for surface adsorption. Among them, the size of the surface adsorption with the carbonization temperature rises increases; while the size of the distribution function first increases with increasing temperature, and reaches a maximum at 300 ?C, and then decrease. In addition, they also naphthalene, phenanthrene, nitrobenzene, between two nitrobenzene adsorption of organic pollutants experiments have shown very good results for the removal has "three to" effect and high affinity for fats removal of polycyclic aromatic hydrocarbons, polychlorinated biphenyls (PCBs) and organochlorine pesticides even better.

       Chen Baoliang, the results of this study for different organic pollutants and biomass materials of different composition and nature of the carbonaceous Crop biomass prepare a suitable biological carbon adsorbent scientific basis. However, he also said that the current study is still stuck in the laboratory stage, but for a number of invention patents. He very much hope that in the near future, the research results can be practical promotion and application of organic water pollution control contribute.

                                                                                 By Sabrina