To effectively remove gaseous pollutants from air using sorbents, a thorough knowledge of the actual sorption performance is needed at ambient conditions rather than at unrealistically high-pressure conditions, as is commonly presented in the literature. To this end, the sorbent capacities of gaseous benzene were evaluated at a constant sorbent bed inlet pressure (50 ppm or ~5 Pa) in 1 atm of N₂, room temperature (298 K), a fixed flow rate (50 mL min⁻¹), and equal outlet sampling intervals (5 min). The benzene adsorption patterns were investigated against six sorbent types in a total of 17 different forms: 1- zeolite in five forms: beads (ZB), ground to 212 µm (ZG212), beads ground to 300 µm (ZG300), coarsely ground/washed zeolite (ZWc), and coarsely ground/washed/thermally treated zeolite (ZTc), 2- activated carbon in two forms: 212 µm (ACd212) and granular (ACdg), 3- Carbopack-X (CX), 4- Tenax TA (TA), 5- used black tea leaves of 150 or 300 µm in three forms: dry (TD150/TD300), wet (TW150/TW300), and wet dust (TWd), and 6- used ground coffee in either dry (CD) or wet forms (CW). Accordingly, the largest adsorption capacities at 5 Pa (e.g., >10 mg g⁻¹) were observed for ACd212 (79.1) and ACdg (73.6). Moderate values (e.g., 5 < < 10 mg g⁻¹) were obtained for ZG212 (7.98), CX (6.79), ZG300 (5.70), and ZB (5.58), while the remainder were far lower at < 5 mg g⁻¹ (e.g., tea leaves, ground coffee, TA, ZWc, and ZTc). The experimental benzene capacities of the tested sorbents were further assessed by the Langmuir, Henry's law, Freundlich, Dubinin-Radushkevich, and Elovich isotherm models. The linearized Langmuir adsorption isotherms of ACd212, ACdg, and CX showed the presence of more than one adsorption site (i.e., retrograde at the lowest pressures and two others at higher pressures). However, TA, zeolite, tea leaves, and ground coffee exhibited a type-V isotherm, wherein the sorption capacity continued to increase with loaded volume (i.e., multilayer adsorption). Thus, ACd212 has the best figure-of-merit based on a high 10% breakthrough volume (BTV) and low cost for real-world applications.

为了使用吸附剂有效地从空气中去除气态污染物，需要全面了解实际吸附性能是在环境条件下，而不是如文献中通常所提出的在不切实际的高压条件下。为此，气态苯的吸附剂容量以恒定的吸附剂床的入口压力进行了评价（为50ppm〜5帕）在1个大气压氮₂，室温（298K），固定流量（50毫升分钟^{- 1个}），以及相等的出口采样间隔（5分钟）。针对总共17种不同形式的六种吸附剂类型研究了苯的吸附模式：1-沸石以五种形式存在：珠（ZB），研磨至212 µm（ZG212），珠研磨至300 µm（ZG300），粗磨/洗过的沸石（ZWc）和粗磨/洗过/热处理过的沸石（ZTc），两种形式的2-活性炭：212 µm（ACd212）和颗粒状（ACdg），3- Carbopack-X（CX），4- Tenax TA（TA），150或300 µm的5用红茶以三种形式出现：干（TD150 / TD300），湿（TW150 / TW300）和湿粉尘（TWd），以及6用过的磨碎咖啡（CD）或湿形式（CW）。因此，对于ACd212（79.1）和ACdg（73.6），在5Pa下观察到最大吸附容量（例如，> 10mg g ^-1）。中度值（例如5 <<10 mg g ^-1）分别针对ZG212（7.98），CX（6.79），ZG300（5.70）和ZB（5.58）获得，而其余的含量远低于<5 mg g ^-1（例如茶叶，咖啡粉，TA，ZWc和ZTc）。通过Langmuir，亨利定律，Freundlich，Dubinin-Radushkevich和Elovich等温线模型进一步评估了被测试吸附剂的实验苯容量。ACd212，ACdg和CX的线性Langmuir吸附等温线显示存在一个以上的吸附位点（即，在最低压力下会逆行，而在更高压力下会出现另外两个）。但是，TA，沸石，茶叶和研磨咖啡表现出V型等温线，其中吸附能力随装载量的增加而持续增加（即多层吸附）。因此，ACd212具有很高的品质因数，这是因为突破性体积（BTV）的高10％和现实应用的低成本。