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首页> 外文期刊>Journal of Polymers and the Environment >Carbamoylethylated Wood Pulp as a New Sorbent for Removal of Hg (Ⅱ) from Contaminated Water: Isotherm and Kinetic Studies
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Carbamoylethylated Wood Pulp as a New Sorbent for Removal of Hg (Ⅱ) from Contaminated Water: Isotherm and Kinetic Studies

机译：氨基甲般的木浆作为一种新的吸附剂，用于从污染的水中去除HG（Ⅱ）：等温和动力学研究

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Mercury is a persistent, heavy metal present in watercourses, and this paper presents the synthesis of a new, low-cost sorbent, based on wood pulp, for the targeted removal of Hg (II) from aqueous solutions. Carbamoylethylated wood pulp sorbents were obtained from the reaction of wood pulp with acrylamide, in basic media, to produce a suite of materials with varying nitrogen concentration (0.251.51%). Batch sorption techniques were used to determine the sorption capacity of each sorbent for Hg (II), as a function of pH, contact time, as well as sorbate and sorbent concentrations. The samples were evaluated for bulk and surface chemistry (nitrogen concentration and FTIR) as well as surface morphology and textural properties (SEM and surface area measurements). Sorption analysis via Langmuir, Freundlich and Temkin models, showed that the data were best represented by the Temkin isotherm model suggesting influence from surface heterogeneity in the adsorption process. Langmuir analysis provides an indication of the maximum sorption uptake at 787.6 mg g(-1), while Freundlich analysis shows the sorption process to be favourable but with some slight suppression at low concentrations. The results indicate the importance of nitrogen concentration and corresponding sorption capacity in Hg (II) sorption kinetics and are consistent with the recovery rates observed. Sorption tests demonstrate that these sorbents have remarkable potential, which is validated through 39% removal of Hg (II) from aqueous solution, and modelling of the kinetic data showed that the system closely flows a pseudo-second-order kinetic model.
机译：汞是一种持续，重金属在水纤维中存在，本文介绍了基于木浆的新的低成本吸附剂，用于从水溶液中靶向除去Hg（II）。从木浆用丙烯酰胺中的丙烯酰胺，碱性介质中的反应得到碳酰甲基丙基木浆吸附剂，以产生具有不同氮浓度（0.251.51％）的材料套件。分批吸附技术用于确定HG（II）的每种吸附剂的吸附能力，作为pH，接触时间以及吸附酸盐和吸附剂浓度的函数。评估样品的体积和表面化学（氮浓度和FTIR）以及表面形态和纹理性质（SEM和表面积测量）。通过Langmuir，Freundlich和Temkin模型的吸附分析表明，Temkin等温模型最佳地代表了吸附过程中表面异质性的影响。 Langmuir分析提供了787.6mg g（-1）的最大吸附吸收的指示，而Freundlich分析显示出有利的吸附过程，但在低浓度下有一些轻微的抑制。结果表明氮浓度和相应吸附能力在HG（II）吸附动力学中的重要性，并且与观察到的回收率一致。吸附试验表明，这些吸附剂具有显着的电位，通过39％从水溶液中除去Hg（II）的39％，并且动力学数据的建模显示，该系统密切流动伪二阶动力学模型。

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