In this study, the method regarding preparation of a tea residue-based activated carbon (AC) was provided. The physicochemical property and adsorption performance of the obtained AC were also investigated. The preparation of AC mainly includes the carbonization at 350 ^°C and activation by potassium hydroxide (KOH). The activation parameters including temperature, time and dosage of KOH are crucial to the physicochemical property of AC samples. According to the ANOVA analysis, the optimum activation conditions are determined as activation temperature of 900 ^°C, activation time of 60 min and mixture ratio of char and KOH of 3:2. The N₂ adsorption/desorption and scanning electron microscopy (SEM) characterizations confirm that AC obtained at the above-mentioned optimum activation conditions, designated as AC7, possesses well-developed porosity. The Langmuir model well describes the adsorption equilibrium of o-cresol on sample AC7. The maximum o-cresol adsorption capacity obtained from the Langmuir model increases with the elevated temperature. The maximum adsorption capacity of o-cresol on sample AC7 could reach up to 476 mg g⁻¹, which is higher than that of other reported AC samples. The adsorption kinetics of o-cresol on sample AC7 follows the pseudo-second-order model. The generated pseudo-second-order rate constant of o-cresol adsorption on sample AC7 rises with the operating temperature. The adsorption thermodynamics study shows that o-cresol adsorption on sample AC7 is spontaneous and endothermic. Apart from the physisorption, the chemisorption does exist between o-cresol and sample AC7. Particularly, the π–π dispersion interaction plays a dominant role during o-cresol adsorption on sample AC7.

在这项研究中，提供了有关制备基于茶渣的活性炭（AC）的方法。还研究了所得AC的理化性质和吸附性能。AC的制备主要包括在350 ^℃下的碳化 和通过氢氧化钾（KOH）的活化。活化参数包括温度，时间和KOH用量对AC样品的理化特性至关重要。根据ANOVA分析，确定最佳活化条件为活化温度为900  ^℃，活化时间为60分钟以及炭和KOH的混合比为3：2。N ₂吸附/解吸和扫描电子显微镜（SEM）的特性证实，在上述最佳活化条件下获得的AC（称为AC7）具有发达的孔隙度。Langmuir模型很好地描述了邻甲酚在样品AC7上的吸附平衡。从Langmuir模型获得的最大邻甲酚吸附能力随温度的升高而增加。邻甲酚在样品AC7上的最大吸附容量可达到476 mg g ^-1，高于其他报告的AC样品。邻甲酚在样品AC7上的吸附动力学遵循伪二级模型。生成的伪二阶速率常数o样品AC7上的-甲酚吸附随操作温度而升高。吸附热力学研究表明，邻甲酚在样品AC7上的吸附是自发的并且是吸热的。除物理吸附外，邻甲酚与样品AC7之间确实存在化学吸附。特别是，π-π分散相互作用在邻甲酚在AC7样品上的吸附过程中起主要作用。