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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†
RSC Advances ( IF 3.9 ) Pub Date : 2018-04-18 00:00:00 , DOI: 10.1039/c8ra00578h Rida Javed 1 , Luqman Ali Shah 1 , Murtaza Sayed 1 , Muhammad Saleem Khan 1
RSC Advances ( IF 3.9 ) Pub Date : 2018-04-18 00:00:00 , DOI: 10.1039/c8ra00578h Rida Javed 1 , Luqman Ali Shah 1 , Murtaza Sayed 1 , Muhammad Saleem Khan 1
Affiliation
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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 Cu2+, Co2+, Ni2+ and Zn2+ from aqueous media. Absorption studies revealed that the absorption of metal ions by the hydrogels followed the order Cu2+ > Ni2+ > Co2+ > Zn2+. 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.
中文翻译：
水凝胶从水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体系：双重应用研究†
聚（甲基丙烯酸）（P（MAA）），聚（丙烯酰胺）（P（AAm））和聚（3-丙烯酰胺丙基三甲基氯化铵）（P（APTMACl））分别合成为阴离子，中性和阳离子水凝胶。合成的水凝胶能够用作吸附剂，用于从水性介质中去除选定的重金属离子，如 Cu 2+、Co 2+、Ni 2+和 Zn 2+ 。吸收研究表明，水凝胶对金属离子的吸收遵循Cu 2+ > Ni 2+ > Co 2+ > Zn 2+的顺序。. 对于吸收机制，应用了 Freundlich 和 Langmuir 吸收等温线。使用原位化学还原方法处理金属离子包埋的水凝胶，以将金属离子转化为金属纳米颗粒，用于合成混合水凝胶。使用 FT-IR 和 SEM 确认合成和形态，而使用 TGA 和 AAS 测量吸收的金属量。混合水凝胶进一步用作催化剂，用于减少水环境中的宏观（亚甲基蓝、甲基橙和刚果红）和微观（4-硝基苯酚和硝基苯）污染物。成功地研究了混合水凝胶的催化性能和可重复使用性。
更新日期：2018-04-18
中文翻译：
水凝胶从水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体系：双重应用研究†
聚（甲基丙烯酸）（P（MAA）），聚（丙烯酰胺）（P（AAm））和聚（3-丙烯酰胺丙基三甲基氯化铵）（P（APTMACl））分别合成为阴离子，中性和阳离子水凝胶。合成的水凝胶能够用作吸附剂，用于从水性介质中去除选定的重金属离子，如 Cu 2+、Co 2+、Ni 2+和 Zn 2+ 。吸收研究表明，水凝胶对金属离子的吸收遵循Cu 2+ > Ni 2+ > Co 2+ > Zn 2+的顺序。. 对于吸收机制，应用了 Freundlich 和 Langmuir 吸收等温线。使用原位化学还原方法处理金属离子包埋的水凝胶，以将金属离子转化为金属纳米颗粒，用于合成混合水凝胶。使用 FT-IR 和 SEM 确认合成和形态，而使用 TGA 和 AAS 测量吸收的金属量。混合水凝胶进一步用作催化剂，用于减少水环境中的宏观（亚甲基蓝、甲基橙和刚果红）和微观（4-硝基苯酚和硝基苯）污染物。成功地研究了混合水凝胶的催化性能和可重复使用性。
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