In the present study, tea waste (TW) and cashew nut shell (CNS), waste biomasses are employed in removal of Acid Green 25 dye from aqueous media. Adsorbents are characterized using BET, SEM, zeta potential, and FTIR analyses. BET surface area was obtained as 25.70 and 68.82 m² g⁻¹ for CNS and TW, respectively. The efficacy of dye removal in the batch study was determined by varying the operating parameters like pH, adsorbent loading, contact time, influent concentration, and temperature. Maximum adsorption was obtained at a pH of 1 using TW and CNS. Adsorbent loading was established at 0.15 g of TW and 0.2 g of CNS. Adsorption was favored at the higher temperatures. Maximum uptake capacities were obtained as 123.46 and 76.34 mg g⁻¹ for TW and CNS, respectively. Better results of dye removal were established for TW in comparison with CNS. Equilibrium data have been well exemplified by Langmuir model, whereas kinetic data suited well to the pseudo-second-order equation for dye removal using TW and CNS. Evaluation of thermodynamic parameters confirmed the spontaneous and physical nature of the studied adsorption. Weber-Morris model established the involvement of different stages in the rate-controlling mechanism. Reusability study performed in five cycles confirmed the potential of TW in removal of Acid Green 25 dye from aqueous media as a slight decrease in uptake capacity from 32.71 mg g⁻¹ for the 1st cycle to 30.52 mg g⁻¹ for the 5th cycle was reported. The overall adsorption study confirmed the efficacy of TW and CNS in removing Acid Green 25 from wastewater.

在本研究中，茶渣（TW）和腰果壳（CNS），废物生物量用于从水性介质中去除Acid Green 25染料。使用BET，SEM，ζ电位和FTIR分析对吸附剂进行表征。对于CNS和TW，获得的BET表面积分别为25.70和68.82m ²  g ^-1。通过更改操作参数（例如pH，吸附剂负载，接触时间，进水浓度和温度）来确定批次研究中的染料去除效果。使用TW和CNS在1的pH值下获得最大吸附。在0.15克TW和0.2克CNS处建立了吸附剂装载量。在较高温度下有利于吸附。获得的最大吸收容量为123.46和76.34 mg g ^-1分别用于TW和CNS。与CNS相比，TW的染料去除效果更好。Langmuir模型已很好地说明了平衡数据，而动力学数据非常适合使用TW和CNS去除染料的伪二级方程。热力学参数的评估证实了所研究的吸附的自然和物理性质。Weber-Morris模型建立了速率控制机制中不同阶段的参与。在五个循环中进行的可重复使用性研究证实了TW在从水性介质中去除酸性绿色25染料的潜力，因为吸收容量从第一个循环的32.71 mg g ^-1轻微降低到30.52 mg g ^-1报告了第5个周期。整体吸附研究证实了TW和CNS在去除废水中的Acid Green 25方面的功效。