In the submitted research work, adsorption characteristic of magnetized Tectona grandis sawdust for methylene blue from aqueous media was explored. The prepared adsorbent was characterized by SEM/EDXS, TEM, BET, XRD, FTIR, TGA-DTG/DTA, VSM, and point of zero charge. To investigate the adsorption capacity and mechanisms prevailing for the adsorption of methylene blue, batch adsorption studies were performed by changing adsorbate/adsorbent contact time, pH, initial dye concentration, and temperature. The removal efficiency was found to be 90.8% under the optimized adsorption conditions. The optimal process parameters were 1 g/L of magnetized adsorbent, 60 min contact time, pH 8, and temperature of 30 °C for 100 mg/L MB solution. The laboratory generated adsorption data was best conformed by pseudo-second-order kinetics and Langmuir adsorption isotherm models. The maximum monolayer adsorption capacity was determined to be 172.41 mg/g. The adsorption process was established to be thermodynamically feasible and accompanying with the absorption of heat and escalation of entropy. Regeneration study revealed that magnetized Tectona grandis sawdust could be reused efficaciously up to four repeated adsorption–desorption cycles using HCl as the best desorbing agent. The magnetized Tectona grandis sawdust has been proved to be novel, efficient, and cost-effective adsorbent. The combined advantages of easy preparation, good affinity towards dyes, excellent separability, reusability, and cost-effectiveness of magnetized Tectona grandis sawdust make it a novel adsorbent.

中文翻译：

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磁化的铁锈木屑作为一种新型吸附剂：制备，表征和利用以从水溶液中去除亚甲基蓝

在提交的研究工作中，磁化的大铁血吸虫的吸附特性探索了来自水性介质的亚甲蓝木屑。通过SEM / EDXS，TEM，BET，XRD，FTIR，TGA-DTG / DTA，VSM和零电荷点对制备的吸附剂进行表征。为了研究亚甲基蓝的吸附能力和普遍存在的吸附机理，通过改变被吸附物/吸附剂的接触时间，pH，初始染料浓度和温度进行了批量吸附研究。发现在最佳吸附条件下的去除效率为90.8％。最佳工艺参数是：对于100 mg / L MB溶液，磁化吸附剂的吸附量为1 g / L，接触时间为60分钟，pH为8，温度为30°C。实验室生成的吸附数据与拟二级动力学和Langmuir吸附等温线模型最吻合。测定的最大单层吸附容量为172.41 mg / g。建立吸附过程是热力学上可行的，并伴随着热量的吸收和熵的增加。再生研究表明，磁化使用HCl作为最佳脱附剂，可以将Tectona grandis木屑有效地重复使用多达四个重复的吸附-脱附循环。磁化的Tectona grandis锯末已被证明是新颖，高效且具有成本效益的吸附剂。易于制备，对染料具有良好的亲和性，极佳的可分离性，可重复使用性以及磁化的铁血木屑木屑的成本效益等综合优势使其成为一种新型吸附剂。