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首页> 外文期刊>RSC Advances >Uptake of heavy metal ions from aqueous media by hydrogels and their conversion to nanoparticles for generation of a catalyst system: two-fold application study
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Uptake of heavy metal ions from aqueous media by hydrogels and their conversion to nanoparticles for generation of a catalyst system: two-fold application study

机译：水凝胶从水性介质中吸收重金属离子并将其转化为纳米颗粒以生成催化剂系统：两项应用研究

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Poly(methacrylic acid) (P(MAA)), poly(acrylamide) (P(AAm)) and poly(3-acrylamidopropyltrimethyl ammonium chloride) (P(APTMACl)) were synthesized as anionic, neutral and cationic hydrogels, respectively. The synthesized hydrogels have the ability to be used as absorbents for the removal of selected heavy metal ions such as Cu ~(2+) , Co ~(2+) , Ni ~(2+) and Zn ~(2+) from aqueous media. Absorption studies revealed that the absorption of metal ions by the hydrogels followed the order Cu ~(2+) > Ni ~(2+) > Co ~(2+) > Zn ~(2+) . For the mechanism of absorption, both Freundlich and Langmuir absorption isotherms were applied. Metal ion entrapped hydrogels were treated using an in situ chemical reduction method in order to convert the metal ions into metal nanoparticles for the synthesis of hybrid hydrogels. The synthesis and morphology were confirmed using FT-IR and SEM, while the absorbed metal amounts were measured using TGA and AAS. The hybrid hydrogels were further used as catalysts for the reduction of macro (methylene blue, methyl orange and congo red) and micro (4-nitrophenol and nitrobenzene) pollutants from the aqueous environment. The catalytic performance and re-usability of the hybrid hydrogels were successfully investigated.
机译：分别合成了聚（甲基丙烯酸）（P（MAA）），聚（丙烯酰胺）（P（AAm））和聚（3-丙烯酰胺基丙基三甲基氯化铵）（P（APTMAC1））作为阴离子，中性和阳离子水凝胶。合成的水凝胶具有用作吸收剂的能力，可从水溶液中去除选定的重金属离子，例如Cu〜（2 +），Co〜（2 +），Ni〜（2+）和Zn〜（2+）。媒体。吸收研究表明，水凝胶对金属离子的吸收顺序为Cu〜（2+）> Ni〜（2+）> Co〜（2+）> Zn〜（2+）。对于吸收机理，同时应用了Freundlich和Langmuir吸收等温线。使用原位化学还原方法处理包裹有金属离子的水凝胶，以便将金属离子转化为金属纳米粒子，以合成杂化水凝胶。使用FT-IR和SEM确认了合成和形态，同时使用TGA和AAS测量了吸收的金属量。杂化水凝胶还被用作从水性环境中还原大分子（亚甲基蓝，甲基橙和刚果红）和微量（4-硝基苯酚和硝基苯）污染物的催化剂。成功研究了杂化水凝胶的催化性能和可重复使用性。

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