Effects of pre, post, and simultaneous loading of natural organic matter on 2-methylisoborneol adsorption on superfine powdered activated carbon: Reversibility and external pore-blocking
Effects of pre, post, and simultaneous loading of natural organic matter on 2-methylisoborneol adsorption on superfine powdered activated carbon: Reversibility and external pore-blocking
复制标题
天然有机物的预、后和同时负载对超细粉状活性炭吸附 2-甲基异龙脑的影响：可逆性和外部孔堵塞
DOI：
10.1016/j.watres.2020.115992
复制
发表时间：
2020
期刊：
影响因子：
12.8
通讯作者：
Shirasaki Nobutaka
中科院分区：
文献类型：
--
作者：
Nakayama Akiko;Sakamoto Asuka;Matsushita Taku;Matsui Yoshihiko;Shirasaki Nobutaka
比较了3种不同的天然有机物(NOM)负载方法对超细粉末活性碳(SPAC)和常规粉末活性碳(PAC)吸附脱除2-甲基异龙脑(MIB)的影响。三种NOM负载方法分别是：NOM吸附后MIB(NOM-预载碳上的MIB吸附)、MIB吸附后NOM(NOM后负载碳上的MIB吸附)和NOM和MIB同时负载(NOM-同时负载碳上的MIB吸附)。对于较小尺寸的碳(SPAC)，在较高的AC剂量和较低的初始NOM浓度下，MIB的去除效果相似。类似的MIB去除表明MIB和NOM之间存在直接的位置竞争，具有MIB吸附的可逆性(NOM完全解吸MIB)。在较低的AC剂量下，尤其是对于PAC，在较高的初始NOM浓度下，MIB的吸附取决于MIB或NOM的吸附顺序。NOM预载碳的MIB去除效果最低，其次是NOM同时负载的碳。NOM的后负载对MIB的去除效果最好，说明吸附是不可逆的。MIB在SPAC上的吸附比在PAC上的吸附更可逆，尽管两种炭的孔径分布相似。与SPAC相比，PAC具有较高的吸附不可逆性，说明PAC颗粒表面负载NOM导致了孔道堵塞。利用同位素作图和15N标记的出水有机物获得了外吸附的图像。
Three different natural organic matter (NOM)-loading methods were compared for the adsorptive removal of 2-methylisoborneol (MIB) by superfine powdered activated carbon (SPAC) and conventionally-sized powdered activated carbon (PAC). The three NOM-loading methods were: NOM adsorption followed by MIB (MIB adsorption on NOM-preloaded carbon), MIB adsorption followed by NOM (MIB adsorption on NOM post-loaded carbon), and simultaneous NOM and MIB loading (MIB adsorption on NOM-simultaneously loaded carbon). MIB removals were similar for the smaller-sized carbon (SPAC) at higher AC dosages and at lower initial NOM concentrations. The similar MIB removals indicate direct site competition between MIB and NOM with MIB adsorption reversibility (complete desorption of MIB by NOM). At lower AC doses, especially for PACs, and at higher initial NOM concentrations, the adsorption of MIBs depended on the sequence of MIB or NOM adsorption. MIB removal was lowest for the NOM-preloaded carbon, followed by NOM-simultaneously loaded carbon. The highest MIB removal was achieved by post-loading of NOM, indicating that the adsorption is irreversible. MIB adsorption on SPAC was more reversible than on PAC, although the pore size distributions of the two carbons were similar. The high degree of adsorption irreversibility for PAC compared with SPAC indicated that pore blocking occurs due to NOM loading at the PAC particle surface. Images of the external adsorption were obtained using isotope mapping and15N-labeled effluent organic matter.