Novel eco-friendly adsorbents were prepared through pyrolysis and acid activation of raw almond leaf (RAL) to form almond leaf biochar (ALB) and chemically activated almond leaf biochar (CAL), respectively. The prepared adsorbents were characterized using TGA, FTIR, SEM–EDX, BET and XRD techniques and their physicochemical properties investigated. RAL, ALB and CAL were utilized for adsorption of BPB dye from aqueous solution using batch technique under optimum conditions. The optimum dye adsorbed by RAL, ALB and CAL were 92.83, 93.21 and 94.89%, respectively at pH 3, dye initial conc. (100 mg/L), adsorbent dose (0.04 g/25 mL), 60 min contact time and 301 K adsorption temperature. Although, Langmuir maximum monolayer adsorption capacities were found to be 365.36, 535.62 and 730.46 mg/g for RAL, ALB and CAL, respectively, but isotherm conformed to Freundlich model. Kinetic study confirmed suitability of pseudo-second-order model with rate constant 9.33 × 10^–4, 9.91 × 10^–4 and 12.60 × 10⁻⁴ g mg⁻¹ min⁻¹ for RAL, ALB and CAL, respectively. Negative values of thermodynamic parameters (∆G and ∆H) established sequestration process to be spontaneous and exothermic. RAL, ALB and CAL were discovered to be highly efficient adsorbents that could be used in place of expensive commercial adsorbents.

通过对生杏仁叶（RAL）进行热解和酸活化，分别形成杏仁叶生物炭（ALB）和化学活化的杏仁叶生物炭（CAL），制备了新型的环保型吸附剂。使用TGA，FTIR，SEM-EDX，BET和XRD技术对制备的吸附剂进行了表征，并对它们的理化性质进行了研究。在最佳条件下，采用分批技术，利用RAL，ALB和CAL从水溶液中吸附BPB染料。在初始pH为3时，RAL，ALB和CAL吸附的最佳染料分别为92.83％，93.21％和94.89％。（100 mg / L），吸附剂剂量（0.04 g / 25 mL），60分钟接触时间和301 K吸附温度。尽管发现Langmuir对RAL，ALB和CAL的最大单层吸附能力分别为365.36、535.62和730.46 mg / g，但等温线符合Freundlich模型。动力学研究证实了速率常数为9.33×10的拟二阶模型的适用性^-4，9.91×10 ^-4和12.60×10 ^-4 克毫克^-1 分钟^-1，用于分别RAL，ALB和CAL。热力学参数的负值（∆G和∆H）建立了自发的，放热的固存过程。发现RAL，ALB和CAL是高效的吸附剂，可以代替昂贵的商业吸附剂使用。