Abstract

Environmental pollution associated with heavy metal contaminated wastewater due to rapid industrialization and urbanization is a global concern. Especially, heavy metal contamination in aqueous bodies is a major ecological problem as they get bioaccumulated are carcinogenic. Lead (Pb) also is one of the carcinogenic metal present in wastewater. The long exposure of Pb(II) through the food chain beyond the limit results in severe health damage and is harmful to the environment. Therefore, various conventional treatment methods have been used to minimize the water pollution due to heavy metals. Among these various methods, the adsorption is considered as the most successful method for separation of Pb(II) from wastewater because it is easy in operation, inexpensive and highly efficient as compared with other methods. The aim of the present study is to assess the potential of Tagetes minuta residue (TMR) which is generated from the Tagetes minuta plant after essential oil extraction for removal of Pb(II) using the adsorption method. The adsorption influenced parameters such as dose (0.8 g), pH value (5.0) and contact time (60 min) were optimized. The adsorption capacity of TMR was found to be 29 mg g^–1 using Langmuir adsorption isotherm. Results followed pseudo-second order kinetics for adsorption of Pd(II) onto TMR. The regeneration efficiency of TMR was found constant up to four cycles with removal efficiency in the range of 89 to 57%. Thus, TMR can be an efficient and cost-effective option for the treatment of water contaminated with Pb(II) ions.

中文翻译：

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万寿菊残渣作为生物吸附剂去除水中的 Pb(II)

摘要

由于快速工业化和城市化，与重金属污染废水相关的环境污染是全球关注的问题。特别是，水体中的重金属污染是一个主要的生态问题，因为它们在生物体内积累是致癌的。铅 (Pb) 也是废水中存在的致癌金属之一。Pb(II) 通过食物链长期超标暴露会导致严重的健康损害并对环境造成危害。因此，各种传统的处理方法已被用于尽量减少重金属对水的污染。在这些不同的方法中，吸附被认为是从废水中分离 Pb(II) 最成功的方法，因为与其他方法相比，它操作简单、成本低廉且效率高。万寿菊植物提取精油后产生的万寿菊残留物 (TMR)，用于使用吸附法去除 Pb(II)。对吸附影响参数如剂量 (0.8 g)、pH 值 (5.0) 和接触时间 (60 分钟) 进行了优化。使用朗缪尔吸附等温线发现 TMR 的吸附容量为 29 mg g ^–1。结果遵循准二级动力学将 Pd(II) 吸附到 TMR 上。发现 TMR 的再生效率在 89% 到 57% 的范围内去除效率高达四个循环。因此，TMR 可以成为处理受 Pb(II) 离子污染的水的有效且具有成本效益的选择。