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多孔床中 Bofe 膨润土煅烧粘土对镍的去除。

Removal of nickel on Bofe bentonite calcined clay in porous bed.

机构信息

UNICAMP/FEQ/DTF, Campinas, SP, Brazil.

出版信息

J Hazard Mater. 2010 Apr 15;176(1-3):109-18. doi: 10.1016/j.jhazmat.2009.10.128. Epub 2009 Dec 1.

Abstract

Bentonite clays have been showing good adsorbing characteristics and are used as an alternative material in the removal of heavy metals. The purpose of this study is to evaluate the removal of nickel on Bofe bentonite calcined clay in porous bed. Firstly, a study was conducted to define the operation outflow, based on the minimum mass transfer zone (MTZ) obtained, useful (q(U)) and total adsorbed (q(T)) removal amounts and total nickel removal percentage (Rem (%)). Assays of nickel adsorption on clay were conducted according to a 2(2) factorial design with three central points to evaluate the effect of the particle diameter and initial adsorbate concentration on variables q(U), q(T) and Rem (%). Tests to obtain the adsorbent physical and chemical characteristics were performed on samples of Bofe clay in natura, calcined, and calcined submitted to nickel adsorption. This clay was characterized according to the following techniques: Energy Dispersive Spectroscopy (EDS), Thermogravimetry (TG), Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), Fourier Transformed Infrared Spectroscopy (FTIR), Physisorption of N(2) (BET), Helium Picnometry and Scanning Electron Microscope (SEM) with metal mapping.

摘要

膨润土黏土具有良好的吸附特性,可用作去除重金属的替代材料。本研究旨在评估多孔床中博菲膨润土煅烧黏土对镍的去除效果。首先,进行了一项研究,根据获得的最小传质区(MTZ)、有用(q(U))和总吸附(q(T))去除量以及总镍去除百分比(Rem(%))来确定操作流出量。根据 2(2)因子设计和三个中心点进行了黏土上镍吸附的实验,以评估粒径和初始吸附质浓度对变量 q(U)、q(T)和 Rem(%)的影响。对博菲黏土原样、煅烧和煅烧后吸附镍的样品进行了吸附剂物理化学特性的测试。该黏土采用以下技术进行了表征:能量色散光谱(EDS)、热重分析(TG)、差示扫描量热法(DSC)、X 射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、氮气物理吸附(BET)、氦比重计和扫描电子显微镜(SEM)以及金属映射。

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