Phosphate removal by anion binding on functionalized nanoporous sorbents.
Phosphate removal by anion binding on functionalized nanoporous sorbents.
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DOI：
10.1021/es100787m
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发表时间：
2010-04-15
影响因子：
11.4
通讯作者：
Yantasee, Wassana
中科院分区：
文献类型：
--
作者：
Chouyyok, Wilaiwan;Wiacek, Robert J.;Pattamakomsan, Kanda;Sangvanich, Thanapon;Grudzien, Rafal M.;Fryxell, Glen E.;Yantasee, Wassana
阳离子金属-EDA络合物固定在介孔二氧化硅MCM-41载体(铜(II)-EDA-SAMMS和Fe(III)-EDA-SAMMS)中，从水溶液中捕获磷酸盐。Fe-EDA-SAMSs在捕获磷酸盐方面比CuEDA-SAMs更有效，并进一步研究了基质效应(例如，pH、离子强度和竞争阴离子)和吸附性能(例如，容量和速率)。土壤对磷酸盐的吸附具有高度的pH依赖性，在pH为1.0~6.5范围内，随pH升高而增加，在pH为6.5以上时则下降。较高的离子强度(0.1M的氯化钠)对吸附有影响。在1000倍摩尔过量的氯离子和硝酸根离子存在下，Fe-EDA-SAMSs的除磷效果不受影响。碳酸氢根、硫酸盐和柠檬酸根离子分别受到轻微、中度和较大的影响。Fe-EDA-SAMS对磷的吸附数据符合朗缪尔模型，估算的最大吸附容量为43.3 mg/g。该材料表现出较快的吸附速率(1分钟内脱磷率达99%)，磷含量降至~10微克/L磷，低于美国环保局规定的淡水中磷污染水平(20微克/L)。
Phosphate was captured from aqueous solutions by cationic metal-EDA complexes anchored inside mesoporous silica MCM-41 supports (Cu(II)-EDA-SAMMS and Fe(III)-EDA-SAMMS). Fe-EDA-SAMMS was more effective at capturing phosphate than the Cu-EDA-SAMMS and was further studied for matrix effects (e.g., pH, ionic strength, and competing anions) and sorption performance (e.g., capacity and rate). The adsorption of phosphate was highly pH dependent; it increased with increasing pH from 1.0 to 6.5, and decreased above pH 6.5. The adsorption was affected by high ionic strength (0.1 M of NaCl). In the presence of 1000-fold molar excess of chloride and nitrate anions, phosphate removal by Fe-EDA-SAMMS was not affected. Slight, moderate and large impacts were seen with bicarbonate, sulfate and citrate anions, respectively. The phosphate adsorption data on Fe-EDA-SAMMS agreed well with the Langmuir model with the estimated maximum capacity of 43.3 mg/g. The material displayed rapid sorption rate (99% of phosphate removal within 1 min) and lowering the phosphate content to ~ 10 µg/L of phosphorus, which is lower than the EPA’s established freshwater contaminant level for phosphorous (20 µg/L).
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影响因子：
15
作者：
BECK, JS;VARTULI, JC;SCHLENKER, JL
通讯作者：
SCHLENKER, JL
影响因子：
13.6
作者：
Abou Taleb, Manal F.;Mahmoud, Ghada A.;Hegazy, El-Sayed A.
通讯作者：
Hegazy, El-Sayed A.
影响因子：
3.8
作者：
Mattigod, Shas V.;Fryxell, Glen E.;Parker, Kent E.
通讯作者：
Parker, Kent E.
影响因子：
9.9
作者：
Chitrakar, R;Tezuka, S;Hirotsu, T
通讯作者：
Hirotsu, T
影响因子：
56.9
作者：
Feng, X;Fryxell, GE;Kemner, KM
通讯作者：
Kemner, KM