Removal of Cd, Cr, and Pb from aqueous solution by unmodified and modified agricultural wastes

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• 作者：Muhammad Mahmood-ul-Hassan ; Vishandas Suthor…
• 关键词：Cadmium ; Chromium ; Lead ; Removal ; Aqueous solution ; Agricultural waste material
• 刊名：Environmental Monitoring and Assessment
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：187
• 期：2
• 全文大小：884 KB
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• 作者单位：Muhammad Mahmood-ul-Hassan (1)
  Vishandas Suthor (1)
  Ejaz Rafique (1)
  Muhammad Yasin (1)
  
  1. Land Resources Research Institute, National Agricultural Research Centre, Islamabad, 45500, Pakistan
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  Ecology
  Atmospheric Protection, Air Quality Control and Air Pollution
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-2959

文摘

The adsorption of cadmium (Cd), chromium (Cr), and lead (Pb), widely detected in wastewater, by unmodified and modified banana stalks, corn cob, and sunflower achene was explored. The three agricultural wastes were chemically modified with sodium hydroxide (NaOH), in combination with nitric acid (HNO3) and sulfuric acid (H2SO4), in order to improve their adsorptive binding capacity. The experiments were conducted as a function of contact time and initial metal ion concentrations. Of the three waste materials, corn cob had the highest adsorptive capacity for Pb than Cr and Cd. The NaOH-modified substrates had higher adsorptive capacity than the acid modified samples. The chemical treatment invariably increased the adsorption capacity between 10 and 100?%. The Langmuir maximum sorption capacity (q m) of Pb was highest (21-0?mg?g? of banana, 30-7?mg?g? of corn cob, and 23-8?mg?g? of sunflower achene) and that of Cd was least (4-?mg?g? of banana, 14-0?mg?g? of corn cob, and 11-6?mg?g? of sunflower achene). The q m was in the order of Pb > Cr > Cd for all the three adsorbents. The results demonstrate that the agricultural waste materials used in this study could be used to remediate water polluted with heavy metals.