Scholarlink

<p>Hexavalent chromium and Xylidine Ponceau dye form a binary mixture that is highly hazardous to the environment. The presence of a second pollutant modifies the adsorbent performance towards one or both pollutants, either by synergism or antagonism. This work evaluated the adsorption performance of a chitosan-based adsorbent over a binary mixture of Cr(VI) and Xylidine Ponceau in batch and fixed-bed configurations. The predicted binary isotherm accurately displayed how the adsorption capacity was affected by the concentration of the other pollutant, based on mono-component and binary adsorption data. The Cr(VI) adsorption capacity remained almost unaffected (~ 13.6&#xa0;mg/g) by the presence of Xylidine Ponceau dye. However, Xylidine Ponceau adsorption capacity was significantly affected by chromium due to the selectivity towards this pollutant, decreasing from 26.9 to 11.4&#xa0;mg/g. The kinetics of Xylidine Ponceau adsorption became faster in the presence of chromium, with PFO kinetic constant going from 0.0270 to 0.1148 1/min, suggesting interactions between both species. The breakthrough curve analysis evidenced a large mass transfer zone, indicating high mass transfer resistance. In this system, the used bed fraction was 46%; within this fraction, chromium occupied 31% of the surface, while the dye covered 13%, as accurately estimated by the modified Thomas model.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Modeling binary adsorption of hexavalent chromium and Xylidine Ponceau dye onto an agave-polymer composite in batch and column systems

  • 期刊论文

  • 发表日期：

    2025年9月1日

查看全文
  • Martín Esteban González-López,
  • Cesar Mario Laureano-Anzaldo,
  • Aida Alejandra Pérez-Fonseca,
  • Jorge Ramón Robledo-Ortíz

摘要

Hexavalent chromium and Xylidine Ponceau dye form a binary mixture that is highly hazardous to the environment. The presence of a second pollutant modifies the adsorbent performance towards one or both pollutants, either by synergism or antagonism. This work evaluated the adsorption performance of a chitosan-based adsorbent over a binary mixture of Cr(VI) and Xylidine Ponceau in batch and fixed-bed configurations. The predicted binary isotherm accurately displayed how the adsorption capacity was affected by the concentration of the other pollutant, based on mono-component and binary adsorption data. The Cr(VI) adsorption capacity remained almost unaffected (~ 13.6 mg/g) by the presence of Xylidine Ponceau dye. However, Xylidine Ponceau adsorption capacity was significantly affected by chromium due to the selectivity towards this pollutant, decreasing from 26.9 to 11.4 mg/g. The kinetics of Xylidine Ponceau adsorption became faster in the presence of chromium, with PFO kinetic constant going from 0.0270 to 0.1148 1/min, suggesting interactions between both species. The breakthrough curve analysis evidenced a large mass transfer zone, indicating high mass transfer resistance. In this system, the used bed fraction was 46%; within this fraction, chromium occupied 31% of the surface, while the dye covered 13%, as accurately estimated by the modified Thomas model.