This work investigates the adsorption mechanism of alachlor and pentachlorobenzene on chars (hydrochars and biochars) originated from Miscanthus giganteus and sugar beet shreds. Two different processes were used: hydrothermal conversion at three temperatures (180, 200, and 220 °C) and slow pyrolysis at 400 °C. Specific surface area (SSA) for all investigated chars ranged 3.87–260 m²/g, whereby biochars had a higher SSA. For hydrochars from sugar beet shreds, both the SSA (3.87–5.53 m²/g) and pore volume (0.023–0.0277 cm³/g) increased with increasing temperature, while the opposite trend was observed for hydrochars from miscanthus. The opposite trend could be a consequence of the different chemical composition of the used feedstock such as hemicelluloses and cellulose which can produce volatile organic products at higher temperatures and may cause the reduction of SSA. All adsorption isotherms were well described by the Freundlich model. The nonlinearity of the isotherms ranged from 0.450 to 0.986. K_d values for both investigated compounds followed the order: hydrochars from sugar beet shred < hydrochars from miscanthus < biochars, implying that the SSA of the chars affects the adsorption mechanism. In general, all the investigated adsorbents demonstrated higher adsorption affinity for pentachlorobenzene in comparison with alachlor, implying that hydrophobic interactions enhanced the adsorption of the more hydrophobic organic compound. In addition, for all hydrochars, adsorption affinities for the smaller pentachlorobenzene are significantly greater than for the larger alachlor, probably due to its ability to better penetrate into the pores of the adsorbents. This type of research is necessary to obtain safe adsorbents for water remediation.

这项工作研究了甲草胺和五氯苯对源自芒草和甜菜丝的炭（水炭和生物炭）的吸附机理。使用了两种不同的过程：在三种温度（180、200和220°C）下进行水热转化，在400°C下缓慢热解。所有被调查焦炭的比表面积（SSA）为3.87–260 m ² / g，因此生物炭具有较高的SSA。对于甜菜丝的碳氢化合物，SSA（3.87–5.53 m ² / g）和孔体积（0.023–0.0277 cm ³/ g）随温度升高而增加，而观察到来自桔属的碳氢化合物却观察到相反的趋势。相反的趋势可能是所用原料（例如半纤维素和纤维素）化学成分不同的结果，它们在较高温度下会产生挥发性有机产物，并可能导致SSA降低。Freundlich模型很好地描述了所有吸附等温线。等温线的非线性范围为0.450至0.986。ķ _d所研究的两种化合物的值均按以下顺序排列：甜菜切丝的炭<芒草的炭<生物炭，表明炭的SSA影响吸附机理。通常，所有研究的吸附剂均与甲草胺相比对五氯苯具有更高的吸附亲和力，这表明疏水性相互作用增强了疏水性更高的有机化合物的吸附。此外，对于所有烃类，较小的五氯苯的吸附亲和力明显大于较大的甲草胺，这可能是由于其能够更好地渗透到吸附剂的孔中。这种类型的研究对于获得用于水修复的安全吸附剂是必要的。