Seredych Mykola, Bandosz Teresa J
Department of Chemistry, The City College of New York, City University of New York, 138th Street and Convent Avenue, New York, New York 10031, USA.
Environ Sci Technol. 2007 May 15;41(10):3715-21. doi: 10.1021/es0624624.
Industrial waste derived adsorbents were obtained by pyrolysis of tobacco waste with either metal sludge or waste oil sludge from a shipyard. The materials were used as media to remove hydrogen sulfide at room temperature in the presence of moisture. The initial and exhausted adsorbents after the breakthrough tests were characterized using sorption of nitrogen, thermal analysis, XRD, elemental analysis, and surface pH measurements. It was found that mixing tobacco and industrial sludges results in a strong synergy, enhancing the catalytic properties of adsorbents. This synergy is observed in both surface chemistry and porosity. During pyrolysis, new mineral phases are formed as a result of solid-state reactions between the components of the sludges. They are highly dispersed on the surface of mesopores. A high volume of these pores is a result of activation of the carbon phase in the composite by alkaline earth metals and also by the release of water from the decomposition of an inorganic phase that is in the predominant quantity. A high temperature of pyrolysis is beneficial for the adsorbents due to the enhanced activation of the carbonaceous phase and the chemical stabilization of the inorganic phase. Samples obtained at low temperatures are sensitive to water, which deactivates their catalytic centers.
工业废弃物衍生吸附剂是通过对烟草废弃物与来自造船厂的金属污泥或废油污泥进行热解而获得的。这些材料被用作在室温及有水分存在的条件下去除硫化氢的介质。在穿透试验之后，对初始吸附剂和耗尽的吸附剂进行了氮气吸附、热分析、X射线衍射、元素分析以及表面pH测量等表征。结果发现，将烟草与工业污泥混合会产生很强的协同作用，增强吸附剂的催化性能。这种协同作用在表面化学和孔隙率方面均有体现。在热解过程中，由于污泥各组分之间的固态反应会形成新的矿物相。它们高度分散在中孔表面。这些孔隙的大量存在是由于碱土金属对复合材料中碳相的活化以及占主导数量的无机相分解所释放的水共同作用的结果。高温热解对吸附剂有利，这是因为碳质相的活化增强以及无机相的化学稳定性提高。在低温下获得的样品对水敏感，这会使其催化中心失活。
