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Adsorption Behavior of DOM by PACs with Different Particle Sizes

机译：不同粒径的PAC对DOM的吸附行为

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摘要

Particle size of powdered activated carbon (PAC) is an important factor influencing the adsorption behavior of organic matter, but the effect of PAC particle size on the removal of different fractions of dissolved organic matter (DOM) is still not well understood. In this work, natural water from a site with anthropogenic influence was used as test water, and the adsorption behavior of different DOM fractions onto three PACs with different particle size was investigated. The results demonstrated that the DOM removal was enhanced 83.3% when the PAC particle size decreased from 76.0 to 19.1 mm. The majority of increased adsorption capacity could be ascribed to microbial by-product and humic-like fractions, or to mid-molecular weight fraction DOM. With the decrease of PAC particle size, the adsorption kinetic constant of low-molecular fraction was greatly enhanced, but the adsorption capacity was enhanced less significantly. By comparing the Brunauer-Emmett-Teller surface area and pore size distribution of PACs with different particle sizes, it was confirmed that the improvement of adsorption by reducing PAC particle size could be attributed to the increase of accessible PAC surface area and decrease of diffusion distance for DOM molecules.
机译：粉末状活性炭（PAC）的粒径是影响有机物吸附行为的重要因素，但是PAC粒径对去除不同比例的溶解有机物（DOM）的影响仍然知之甚少。在这项工作中，使用来自人为影响部位的天然水作为测试水，并研究了不同DOM组分在三种粒径不同的PAC上的吸附行为。结果表明，当PAC粒径从76.0降至19.1 mm时，DOM去除率提高了83.3％。大部分增加的吸附能力可归因于微生物副产物和腐殖质样组分，或中等分子量组分DOM。随着PAC粒径的减小，低分子级分的吸附动力学常数大大提高，但吸附能力却没有明显提高。通过比较不同粒径的PAC的Brunauer-Emmett-Teller表面积和孔径分布，可以确定通过降低PAC粒径来提高吸附能力归因于可利用的PAC表面积的增加和扩散距离的减小用于DOM分子。

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