scholarly journals Rapid Preparation of Biosorbents with High Ion Exchange Capacity from Rice Straw and Bagasse for Removal of Heavy Metals

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Supitcha Rungrodnimitchai
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Ion Exchange ◽  
Rice Straw ◽  
Heavy Metal Ions ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Exchange Capacity ◽  
Ion Exchange Capacity ◽  
Removal Of Heavy Metals

This work describes the preparation of the cellulose phosphate with high ion exchange capacity from rice straw and bagasse for removal of heavy metals. In this study, rice straw and bagasse were modified by the reaction with phosphoric acid in the presence of urea. The introduced phosphoric group is an ion exchangeable site for heavy metal ions. The reaction by microwave heating yielded modified rice straw and modified bagasse with greater ion exchange capacities (∼3.62 meq/g) and shorter reaction time (1.5–5.0 min) than the phosphorylation by oil bath heating. Adsorption experiments towards Pb2+, Cd2+, and Cr3+ions of the modified rice straw and the modified bagasse were performed at room temperature (heavy metal concentration 40 ppm, adsorbent 2.0 g/L). The kinetics of adsorption agreed with the pseudo-second-order model. It was shown that the modified rice straw and the modified bagasse could adsorb heavy metal ions faster than the commercial ion exchange resin (Dowax). As a result of Pb2+sorption test, the modified rice straw (RH-NaOH 450W) removed Pb2+much faster in the initial step and reached 92% removal after 20 min, while Dowax (commercial ion exchange resin) took 90 min for the same removal efficiency.

Chelating Resin versus Ion-Exchange Resin for Heavy Metal Removal in Toxicity Fractionation

1992 ◽  
Vol 26 (1-2) ◽  
pp. 189-196 ◽  
Author(s):  
C. N. Mazidji ◽  
B. Koopman ◽  
G. Bitton
Keyword(s):  
Heavy Metal ◽  
Ion Exchange ◽  
Exchange Resin ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Complete Removal ◽  
Ion Exchange Resin ◽  
Chelating Resin ◽  
Heavy Metal Cations ◽  
Removal Of Heavy Metals

A chelating resin (Chelex 50-100) and ion-exchange resin (Dowex 50W-X8) were evaluated for removal of heavy metals in toxicity fractionation. Microtox and β-galactosidase activity were employed as toxicity endpoints. The resins were packed into 4 raL glass Pasteur pipettes for use. Chelating resin provided complete removal of toxicity due to polyvalent heavy metal cations (Cd, Cu, Hg, Pb, Zn). Ion-exchange resin was ineffective in removing mercury toxicity. Neither resin provided complete removal of Ag+ toxicity. Toxicity of organic compounds was, at most, partially removed. Performance of the ion-exchange and chelating resins was insensitive to hardness and pH. Based on these results, chelating resin is recommended for heavy metal removal as part of a toxicity fractionation procedure.

Studies on Synthesis and Ion Exchange Properties of Sulfonated Polyvinyl Alcohol/Phosphomolybdic Acid Composite Cation Exchanger

2016 ◽  
Vol 875 ◽  
pp. 149-155
Author(s):  
Mukta Rathore ◽  
Ahmad Jahan Khanam ◽  
Vikas Gupta
Keyword(s):  
Heavy Metal ◽  
Ion Exchange ◽  
Polyvinyl Alcohol ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Ion Pairs ◽  
Phosphomolybdic Acid ◽  
Exchange Capacity ◽  
Ion Exchange Capacity

In this study, sulfonated polyvinyl alcohol/phosphomolybdic acid composite cation exchange membrane was prepared by solution casting method. Some of the ionb exchange peroperties such as ion exchange capacity for alkali and alkali metal ions, effect of temperature on ion exchange capacity, elution behavior, effect of eluent concentration, distribution coefficient were studied. On the basis of selectivity coefficient values some important binary separation of heavy metal ion pairs such as Hg (II)-Zn (II), Hg (II)-Cd (II), Hg (II)-Ni (II) and Hg (II)-Cu (II) were carried out. It was observed that elution of heavy metal ions depends upon the metal-eluting ligand stability. Mercury remained in column for a longer time than that of other heavy metal ions. The separations are fairly sharp and recovery of Hg (II) ions is quantitative and reproducible.

Removal of heavy metals from industrial waste solutions by a rotating fixed bed of ion exchange resin

2017 ◽  
Vol 100 ◽  
pp. 178-184 ◽  
Author(s):  
M.A. Hagag ◽  
D.A. El-Gayar ◽  
S.A. Nosier ◽  
A.A. Mubark
Keyword(s):  
Heavy Metals ◽  
Ion Exchange ◽  
Industrial Waste ◽  
Exchange Resin ◽  
Fixed Bed ◽  
Ion Exchange Resin ◽  
Removal Of Heavy Metals

Interaction of heavy metal ions with an ion exchange resin obtained from a natural polyelectrolyte

2011 ◽  
Vol 67 (4) ◽  
pp. 669-676 ◽  
Author(s):  
Hernán A. Maturana ◽  
Iván M. Perič ◽  
Bernabé L. Rivas ◽  
S. Amalia Pooley
Keyword(s):  
Heavy Metal ◽  
Ion Exchange ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Exchange Resin ◽  
Ion Exchange Resin

scholarly journals Modified ion exchange jackfruit seeds resin for removal of selected trace heavy metal ions from aqueous solution

2021 ◽  
Vol 2 (2) ◽  
pp. 84-92
Author(s):  
S N Ndung’u ◽  
E W Nthiga ◽  
R N Wanjau
Keyword(s):  
Heavy Metal ◽  
Ion Exchange ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Active Sites ◽  
Ion Exchange Resin ◽  
Standard Entropy ◽  
Environmentally Sustainable ◽  
Heavy Metal Ions Removal ◽  
Metal Ions Removal

Water is essential for every life processes. However, its quality is deteriorating every day due to the recent industrial advancements. Anthropogenic processes such as industrialization, mining and agricultural activities have led to alarming discharge of heavy metal ions to the aquatic bodies. This possess a greater threat to human, animal and the entire ecosystem wellbeing. Accumulation of heavy metal ions in drinking water beyond permissible limits is detrimental to human health. Therefore, their removal is paramount. Conventional remediation techniques have been employed but have remained expensive and not universally appropriate. This has therefore spurred research interests in the use of adsorption techniques from locally available materials as an environmentally sustainable alternative. Jackfruit seeds are discarded as wastes of a Jackfruit and can be utilized as an ion exchange resin in heavy metal ions removal from wastewater. The present study involved application of previously prepared raw and modified Jackfruit seed resins to study thermodynamics of copper (II), lead (II) and cadmium (II) ions adsorption from synthetic water. FTIR results showed presence of functional groups in raw and modified resins as important sites for studying thermodynamics of adsorption of copper (II), lead (II) and cadmium (II) ions. Thermodynamic data showed that standard Gibb’s free energy () values for all metals were negative indicating that adsorption process was feasible and favourable. Standard enthalpy change (), standard entropy () and activation energy () were positive (> 40 kJ mol-1) and in the order lead (II) > copper (II) > cadmium (II). This confirmed adsorption of copper (II), lead (II) and cadmium (II) ions onto both raw and modified resins was predominated by chemical interactions between the metal ions and the resin active sites. This was confirmed by very low values of sticking probability (S*). The findings indicated that ion exchange Jackfruit seeds resin is promising for heavy metal ions removal from wastewater in an optimized temperature controlled system.

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