Ultrafine microparticulation of adsorbents breaksadvanced membrane process

超细粉末活性炭（SPAC）对天然有机物（NOM）和聚苯乙烯磺酸盐（PSSs）的吸附能力高于常规粉末活性炭（PAC）。增加的吸附容量是由于更大的外表面积，因为NOM和PSS分子没有完全穿透吸附剂颗粒;它们优先吸附在颗粒的外表面附近。场发射扫描电子显微镜/能量色散X射线光谱的结果提供了这一现象的直接证据。我们还成功地提出了壳吸附模型（SAM）来定量描述不同粒径的碳颗粒的吸附等温线。吸附动力学可用SAM +分支孔动力学模型描述。SPAC用于膜微滤的混凝预处理，既能降低膜压的升高，又能提高溶解性物质的去除率。从絮凝理论的角度对絮凝机理进行了解释：絮凝体粒径、颗粒间碰撞频率和NOM去除率。

The capacity to adsorb natural organic matter (NOM) and polystyrene sulfonates (PSSs) on super-fine powdered-activated carbon (SPAC) is higher than that on conventional powdered-activated carbon (PAC). Increased adsorption capacity was due to the larger external surface area because the NOM and PSS molecules did not completely penetrate the adsorbent particle; they preferentially adsorbed near the outer surface of the particle. The results of field emission scanning electron microscopy/energy-dispersive X-ray spectrometry provided the direct evidence of this phenomenon. We also successfully proposed the Shell Adsorption Model (SAM) to describe quantitatively adsorption isotherms of different carbon particle sizes. The adsorption kinetics was well described by SAM + Branched Pore Kinetic Model. The use of SPAC in the coagulation pretreatment for membrane microfiltration attenuates trans-membrane pressure increases as well as enhancing the dissolved substance removal. The mechanism was explained on coagulation theory: floc particle size, particle-particle collision frequency, and NOM removal.