NSF CONACyT-GOALI: Arsenic Removal from Water with Iron-Tailored Activated Carbon: Fundamental Redox Characterization

NSF CONACyT-GOALI：使用铁定制活性炭去除水中砷：基本氧化还原表征

• 批准号: 0523196
• 负责人: Brian Dempsey
• 金额: $ 10万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0523196&HistoricalAwards=false
• 关键词: NSF; CONACyT; GOALI; Arsenic; Removal

0523196 Dempsey This project seeks to evaluate the mechanisms for very high removal capacities of arsenic (As) by granular activated carbon (GAC) that has been pretreated with iron-citrate. Previous studies by the PIs found this phenomenon of high capacity, which cannot be explained by conventional equilibrium models involving sorption onto ferric hydroxide or iron-arsenic precipitates. The study will test the hypothesis that removal of As(V) at a greater than 1:1 molar ratio of As:Fe is due to reduction and subsequent precipitation of arsenic sulfides within the pores of GAC. The PIs also will investigate the importance of various basic water quality/chemistry characteristics, such as pH, alkalinity, and concentrations of natural organic matter and dissolved oxygen, on rates and extent of As removal. The speciation of As after its removal by tailored GAC will be determined using extended x-ray absorption fine-structure spectroscopy (EXAFS) and Mossbauer spectroscopy.

0523196 Dempsey该项目旨在评估用柠檬酸铁预处理的颗粒活性炭（GAC）对砷（As）的高去除能力的机制。PI先前的研究发现了这种高容量现象，这不能用涉及氢氧化铁或铁砷沉淀物吸附的传统平衡模型来解释。该研究将测试的假设，即在大于1：1的As：Fe摩尔比的As（V）的去除是由于还原和随后的GAC孔隙内的砷硫化物沉淀。PI还将调查各种基本水质/化学特性的重要性，如pH值，碱度，天然有机物和溶解氧的浓度，对As去除率和程度的影响。将确定使用扩展X射线吸收精细结构光谱（EXAFS）和穆斯堡尔谱的形态后，其去除定制的GAC。