Among various environmental pollutants, dyes have been reported to contaminate a large quantity of surface water. Rhodamine B, a widely applicable basic dye, is known for its hazardous impact on environment. The present study proposes the application of readily available waste banana peels for the remediation of water contaminated with Rhodamine B. The potential of prepared material to decontaminate Rhodamine B was examined as the function of various parameters. Variation in adsorption time, dose of adsorbent, pH value, and initial concentration has been observed under the influence of diverse condition. Quantitative adsorption was observed at a contact time of 60 min with an adsorbent dose of 12 mg. An increase in the initial dye concentration resulted in the enhancement of adsorption capacity of adsorbent. The value of enthalpy change was observed to be − 8.95 kJ mol⁻¹. The negative value indicates the exothermic removal of Rhodamine B from water. Various models were applied to explain thermodynamics and kinetics of the process. Adsorption kinetics was better explained with pseudo-second-order model, whereas adsorption mechanism by intra-particle diffusion model reveals that pore diffusion was not only the rate-controlling step.

中文翻译：

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香蕉皮活性炭：若丹明B水溶液中去污的潜在吸附剂

在各种环境污染物中，据报道染料会污染大量的地表水。罗丹明B是一种广泛适用的碱性染料，以其对环境的有害影响而闻名。本研究提出了易于使用的废香蕉皮在补救若丹明B污染的水中的应用。作为各种参数的函数，考察了制备的材料对若丹明B进行去污的潜力。在各种条件的影响下，已观察到吸附时间，吸附剂剂量，pH值和初始浓度的变化。接触时间为60分钟，吸附剂量为12 mg，观察到定量吸附。初始染料浓度的增加导致吸附剂的吸附能力增强。^-1。负值表示从水中放出罗丹明B放热。应用了各种模型来解释该过程的热力学和动力学。假二阶模型更好地解释了吸附动力学，而颗粒内扩散模型的吸附机理表明，孔扩散不仅是速率控制步骤。