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首页> 外文期刊>Environmental Science and Pollution Research >Removal of methylene blue dye from aqueous solution using immobilized Agrobacterium fabrum biomass along with iron oxide nanoparticles as biosorbent
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Removal of methylene blue dye from aqueous solution using immobilized Agrobacterium fabrum biomass along with iron oxide nanoparticles as biosorbent

机译：使用固定化的水溶液除去亚甲基蓝色染料=“斜斜体”>土壤杆菌纤维素和生物量与生物吸附剂一起使用氧化铁纳米粒子

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摘要

A nano-biosorbent for the removal of methylene blue (MB) was prepared by encapsulating iron oxide nanoparticles (NPs) and Agrobacterium fabrum strain SLAJ731, in calcium alginate. The prepared biosorbent was optimized for the maximum adsorption capacity at pH 11, 160?rpm, and 25?°C. Adsorption kinetics was examined using pseudo-first-order, pseudo-second-order, and intra-particle diffusion (IPD) models. The kinetic data agreed to pseudo-second-order model indicating chemisorption of MB, which was also explained by FTIR analysis. The adsorption rate constant ( k ~(2)) decreased and initial adsorption rate (h, mg g_(?1)min_(?1)) increased, with an increase in initial dye concentration. The dye adsorption process included both IPD and surface adsorption, where IPD was found to be a rate-limiting step after 60?min of adsorption. The adsorption capacity was found to be 91?mg?g_(?1)at 200?mg?L_(?1)dye concentration. Adsorption data fitted well to Freundlich isotherm; however, it did not fit to Langmuir isotherm, indicating adsorbent surfaces were not completely saturated (monolayer formed) up to the concentration of 200?mg?L_(?1)of MB. Thermodynamic studies proposed that the adsorption process was spontaneous and exothermic in nature. Biosorbent showed no significant decrease in adsorption capacity even after four consecutive cycles. The present study demonstrated dead biomass along with NPs as a potential biosorbent for the treatment of toxic industrial effluents.
机译：通过在藻酸钙中包封氧化铁纳米颗粒（NPS）和土壤杆菌菌株SLAJ731，制备用于除去亚甲基蓝（MB）的纳米生物吸附剂。优化制备的生物吸附剂在pH11,160〜RPM和25℃下的最大吸附容量进行了优化。使用伪一阶，伪二阶和粒子扩散（IPD）模型检查吸附动力学。表明MB的化学吸附的伪二阶模型同意的动力学数据也通过FTIR分析解释。吸附速率常数（K〜（2））降低和初始吸附速率（H，Mg G _（α1）分钟_（α1））增加，初始染料浓度增加。染料吸附过程包括IPD和表面吸附，其中IPD被发现是吸附60次次数后的速率限制步骤。发现吸附容量为200×mg？L _（α1）染料浓度为91Ωmg≤g_（α1）。吸附数据适用于Freundlich等温线;然而，它不适合Langmuir等温线，表示吸附剂表面不是完全饱和的（单层形成），其浓度为200μmb的浓度为200μmb≤1℃。热力学研究提出了吸附过程本质上是自发性和放热的。即使在四个连续循环后，生物吸收剂表明也没有显着降低吸附能力。本研究证明了死生物质以及NPS作为治疗有毒工业污水的潜在生物吸附剂。

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