A new class of hybrid mesoporous materials with functionalized organic monolayers for selective adsorption of heavy metal ions

2000 ◽  
pp. 1145-1146 ◽  
Author(s):  
A. M. Liu ◽  
K. Hidajat ◽  
S. Kawi ◽  
D. Y. Zhao
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Mesoporous Materials ◽  
Heavy Metal Ions ◽  
Selective Adsorption ◽  
Organic Monolayers ◽  
New Class ◽  
Hybrid Mesoporous Materials

scholarly journals Effects of Electronegativity and Hydration Energy on the Selective Adsorption of Heavy Metal Ions by Synthetic NaX Zeolite

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4066
Author(s):  
Xianyuan Fan ◽  
Hong Liu ◽  
Emmanuella Anang ◽  
Dajun Ren
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Heavy Metal Ions ◽  
Binary Systems ◽  
Adsorption Mechanism ◽  
Selective Adsorption ◽  
Hydration Energy ◽  
Nax Zeolite ◽  
High Electronegativity

The adsorption capacity of synthetic NaX zeolite for Pb2+, Cd2+, Cu2+ and Zn2+ in single and multi-component systems were investigated. The effects of electronegativity and hydration energy on the selective adsorption, as well as potential selective adsorption mechanism of the NaX zeolite for Pb2+, Cd2+, Cu2+ and Zn2+ were also discussed. The maximum adsorption capacity order of the heavy metals in the single system was Pb2+ > Cd2+ > Cu2+ > Zn2+, and this could be related to their hydration energy and electronegativity. The values of the separation factors (α) and affinity constant (KEL) in different binary systems indicated that Pb2+ was preferentially adsorbed, and Zn2+ presented the lowest affinity for NaX zeolite. The selective adsorption capacities of the metals were in the order, Pb2+ > Cd2+ ≈ Cu2+ > Zn2+. The trend for the selective adsorption of NaX zeolite in ternary and quaternary systems was consistent with that in the binary systems. Pb2+ and Cu2+ reduced the stability of the Si-O-Al bonds and the double six-membered rings in the NaX framework, due to the high electronegativity of Pb2+ and Cu2+ than that of Al3+. The selective adsorption mechanism of NaX zeolite for the high electronegative metal ions could mainly result from the negatively charged O in the Si-O-Al structure of the NaX zeolite, hence heavy metal ions with high electronegativity display a strong affinity for the electron cloud of the oxygen atoms in the Si-O-Al. This study could evaluate the application and efficiency of zeolite in separating and recovering certain metal ions from industrial wastewater.

scholarly journals Insight into the Synergistic Effect on Selective Adsorption for Heavy Metal Ions by a Polypyrrole/TiO2Composite

Langmuir ◽  
2018 ◽  
Vol 34 (34) ◽  
pp. 10187-10196 ◽  
Author(s):  
Jie Chen ◽  
Mengting Yu ◽  
Caiyun Wang ◽  
Jiangtao Feng ◽  
Wei Yan
Keyword(s):  
Heavy Metal ◽  
Synergistic Effect ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Selective Adsorption ◽  
Insight Into

scholarly journals Poly (Amidehydrazide) Hydrogel Particles for Removal of Cu2+ and Cd2+ Ions from Water

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 121
Author(s):  
Hojung Choi ◽  
Taehyoung Kim ◽  
Sang Youl Kim
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Suspension Polymerization ◽  
Polymerization Process ◽  
New Class ◽  
Hydrogel Particles ◽  
Ion Sorption ◽  
Hyperbranched Poly ◽  
Sorption Ability

Poly(amidoamine)s (PAMAM) are very effective in the removal of heavy metal ions from water due to their abundant amine and amide functional groups, which have a high binding ability to heavy metal ions. We synthesized a new class of hyperbranched poly(amidehydrazide) (PAMH) hydrogel particles from dihydrazides and N,N′-methylenebisacrylamide (MBA) monomer by using the A2 + B4 polycondensation reaction in an inverse suspension polymerization process. In Cd2+ and Cu2+ ion sorption tests, the synthesized dihydrazide-based PAMH hydrogel particles exhibited sorption capacities of 85 mg/g for copper and 47 mg/g for cadmium. Interestingly, the PAMH showed only a 10% decrease in sorption ability in an acidic condition (pH = 4) compared to the diamine-based hyperbranched PAMAM, which showed a ~90% decrease in sorption ability at pH of 4. In addition, PAMH hydrogel particles remove trace amounts of copper (0.67 ppm) and cadmium (0.5 ppm) in water, below the detection limit.

Facet-Dependent Selective Adsorption of Mn-Doped α-Fe2O3 Nanocrystals toward Heavy-Metal Ions

2017 ◽  
Vol 29 (23) ◽  
pp. 10198-10205 ◽  
Author(s):  
Qinglin Yuan ◽  
Pengfei Li ◽  
Jun Liu ◽  
Yue Lin ◽  
Yunyu Cai ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Selective Adsorption ◽  
Mn Doped

Thermoresponsive Ion-Imprinted Hydrogels with Interpenetrating Network Structure for Removal of Heavy Metal Ions

2013 ◽  
Vol 643 ◽  
pp. 83-86 ◽  
Author(s):  
Jing Jing Wang ◽  
Fang Liu
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Network Structure ◽  
Heavy Metal Ions ◽  
Selective Adsorption ◽  
Triethylene Glycol ◽  
Solution Temperature ◽  
Interpenetrating Network ◽  
Ion Imprinted ◽  
Ion Imprinting

A novel thermoresponsive Cu(II) ion-imprinted hydrogel [Cu(II)-IIH] with interpenetrating network structure has been prepared to remove Cu(II) ions with high selectivity. The Cu(II)-IIH was prepared by free radical/cationic hybrid photopolymerization of N-isopropylacrylamide (NIPAM) and triethylene glycol divinyl ether (DVE-3) using Cu(II) ion as template. The Cu(II)-IIH was used to remove heavy metal ions from aqueous solution at 20 and 40oC. The Cu(II)-IIH selectively bound the template ion above a lower critical solution temperature (LCST) of poly(N-isopropylacrylamide) (PNIPAM). The memory was fixed by shrinking above the LCST, and was deleted by swelling below the LCST. Selective adsorption study indicated that ion imprinting resulted in stronger affinity of the Cu(II)-IIH toward Cu(II) ions than other competitor metal ions compared with the non-imprinted hydrogel (NIH).

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