Abstract

This study aims to investigate the sorptive performance of Pb(II) from water of a novel biochar (WPC) produced by fast pyrolysis under anoxic conditions of wild plants (WP). The maximum Pb(II) sorption capacity of WPC is 50.25 mg/g under determined optimum conditions, which are solution pH 5.0, WPC dose 50 mg, contact time 180 min and solution temperature 50 °C. The sorption kinetics and isotherm data were observed to fit well with the Ho-McKay and Langmuir models, respectively. The thermodynamic parameters (ΔG^o, ΔH^o and ΔS^o) calculated for the WPC-Pb(II) sorption system showed that the process was spontaneous and endothermic. The Pb(II) desorption and regeneration studies of WPC with different desorbent agents was also performed. The findings in this study showed that WP can be used as an abundant precursor in the production of very low cost and eco-friendly biochar, and also that its biochar can be used as an environmentally-friendly sorbent in wastewater treatment.

Novelty statement

With increasing population and developing industry in the world, agriculture and industrial wastes are increasing. These wastes create environmental and water pollution and adversely affect the health of living things. Efforts to eliminate these negativities have a negative impact on the world economy. For this purpose, various improvement methods are applied. However, the adsorption method is widely used due to its ease of application, efficiency and economic. In order to make this method more economical, many researchers have carried out researches on the preparation of low-cost adsorbents, especially from vegetable wastes.

The novelty of this study is the first reporting to use wild plants as a sustainable precursor to produce a low-cost biochar using the traditional pyrolysis method and to examine its adsorption performance for Pb(II) ion removal from water. I believe that if this study is published, it will create a paradigm in environmental improvement studies on wild plants evaluation.

摘要

本研究旨在研究在野生植物（WP）缺氧条件下快速热解产生的新型生物炭（WPC）对水中Pb（II）的吸附性能。在确定的最佳条件下，WPC 的最大 Pb(II) 吸附容量为 50.25 mg/g，即溶液 pH 值 5.0、WPC 剂量 50 mg、接触时间 180 min 和溶液温度 50 °C。观察到吸附动力学和等温线数据分别与 Ho-McKay 和 Langmuir 模型非常吻合。热力学参数 (Δ G ^o , Δ H ^o和 Δ S ^o) 计算的 WPC-Pb(II) 吸附系统表明该过程是自发的和吸热的。还进行了具有不同解吸剂的 WPC 的 Pb(II) 解吸和再生研究。本研究结果表明，WP可作为一种丰富的前驱体，用于生产成本极低且环保的生物炭，其生物炭还可用作废水处理中的环保吸附剂。

新颖性声明

随着世界人口的增加和工业的发展，农业和工业废物不断增加。这些废物造成环境和水污染，并对生物的健康产生不利影响。消除这些负面影响的努力对世界经济产生了负面影响。为此，应用了各种改进方法。然而，吸附法由于其易于应用、高效和经济而被广泛使用。为了使这种方法更加经济，许多研究人员对制备低成本吸附剂进行了研究，特别是从植物废弃物中制备吸附剂。

本研究的新颖之处在于首次报道使用野生植物作为可持续前体，使用传统的热解方法生产低成本的生物炭，并检查其从水中去除 Pb(II) 离子的吸附性能。我相信，如果这项研究发表，它将为野生植物评价的环境改善研究开创一个范式。