To enhance the adsorption capacity via increasing the pore filling, the exchangeable ions content and electrostatic interaction, a late-model NaOH modified tea biochar for MB and OR-II removal was prepared. The effects of pyrolysis temperature, mass ratio of NaOH/tea residue powder (TRP) and other operation parameters, such as initial pH of the solution, contact time, initial concentration of dyes and adsorbent dosage on OR-II and MB removal in aqueous solution were studied by batch adsorption experiment. The results showed that with 10% w/w NaOH/TRP and pyrolysis at 700℃, the maximum adsorption capacities of BH700-10 of 105.27 and 91.68 mg/g for 250 mg/L MB and OR-II at pH10 or 2, respectively, were observed at 60 min. The adsorption isotherms of MB were in accordance with Langmuir and Sips models while the adsorption of OR-II was better described by the Freundlich model. The pseudo-second-order kinetic model could better describe the adsorption process. The possible interactions involved in the adsorption process was proposed. The results of this study indicated that BH700-10 is a promising low-cost adsorbent in dye wastewater treatment.

为了通过增加孔填充，可交换离子含量和静电相互作用来增强吸附能力，制备了用于MB和OR-II去除的最新型NaOH改性茶生物炭。热解温度，NaOH /茶渣粉的质量比（TRP）和其他操作参数（例如溶液的初始pH，接触时间，染料的初始浓度和吸附剂剂量）对OR-II和水溶液中MB去除的影响通过间歇吸附实验进行了研究。结果表明，在10％w / w NaOH / TRP和700℃热解的条件下，BH700-10在pH10或2下对250 mg / L MB和OR-II的最大吸附容量分别为105.27和91.68 mg / g。在60分钟时观察到。MB的吸附等温线符合Langmuir和Sips模型，而OR-II的吸附可以用Freundlich模型更好地描述。拟二级动力学模型可以更好地描述吸附过程。提出了吸附过程中可能的相互作用。这项研究的结果表明，BH700-10是一种有前途的低成本吸附剂，用于染料废水处理。