45
synthesized were utilized to remove certain toxic metal ions from water-based
medium (Isobe et al. 2013).
2.9.1 Starch-Based Hydrogel as Adsorbent
The efficacy of removing metallic ions from their water-based solution was explored
through interlinked carboxymethyl corn starch. When 1% starch was incorporated,
mercury, lead, and cadmium in water were almost entirely removed. Starch could be
regained by cleaning the metallic ions with weak acid from the complex (pH 2.0),
although this method slightly lowered the metal bonding activity of the starch. The
starch obtained from corn has been altered with natural compounds, itaconic acid,
and maleic acid through esterification in a water medium, and duty of catalysis was
performed by NaOH to generate sorbents for the removal of metallic cations in
water bodies. The impact of single and double alteration of both acids has been
explored on the swelling and solubility ability of the modified starch. In addition,
the ability of itaconic acid-substituted starches to adsorb metal cations such as
nickle, cadmium, zinc, and mercury has been checked, and data likened with natural
corn starch (Ma et al. 2015).
The acid hydrolysis has functionalized the starch and/or oxidized to form –
COOH group at six number carbon by nitrogen oxides. Copper ion sorption was
researched as a purpose of composition of hydrogel and other variables. Hydrogels
display a connection between structure and property in the Cu
2+
ion sorption. The
hydrogel showing the peak ion uptake was taken to analyze the impact of the concentration on sorption ability of contact moment, pH, temperature, and Cu
2+
ions
(El-Hamshary et al. 2014). In addition, carboxyl-containing anionic starch
researched its use as a chelating agent. As the acrylic content improved, the sorption
effectiveness of the alkali-treated samples improved. The sorption values relied on
the metal ion for separate heavy metals and followed the order
Hg
2+
> Cu2+ > Zn
2+
> Pb
2+
. The removal efficiency with respect to pH has been
shown in Fig. 2.6 (Kweon et al. 2001).
An innovative cross-linking at the sodium xanthate doped polyacrylamide was
grafted upon starch extracted from corn, the copolymerization of acrylamide (AM)
and sodium xanthate reactions by epichlorohydrin (EPI) as a cross-linking agent
and ceric ammonium nitrate (CAN) as starter. In sewage therapy, the efficiency of
the synthesized hydrogel was explored. Recently, metal anion adsorption mechanisms have been explored by quaternary ammonium amphoteric starch and carboxymethyl groups. The adsorption capability was discovered to be dependent on
solution pH, cross-linked amphoteric starch dose, and original Pb (II) ion concentration. The proposed responses are engaged in the process of preparing (Yin et al.
2008) (Fig. 2.7).
Also used to eliminate chromium VI from aqueous solution were interlinked acid
base starches (CASs). It was discovered that the adsorption method depends on
original pH, Cr (VI), CAS dose, and temperature. In addition, phosphate
2 Polymer Absorbents for Heavy Metal Removal
synthesized were utilized to remove certain toxic metal ions from water-based
medium (Isobe et al. 2013).
2.9.1 Starch-Based Hydrogel as Adsorbent
The efficacy of removing metallic ions from their water-based solution was explored
through interlinked carboxymethyl corn starch. When 1% starch was incorporated,
mercury, lead, and cadmium in water were almost entirely removed. Starch could be
regained by cleaning the metallic ions with weak acid from the complex (pH 2.0),
although this method slightly lowered the metal bonding activity of the starch. The
starch obtained from corn has been altered with natural compounds, itaconic acid,
and maleic acid through esterification in a water medium, and duty of catalysis was
performed by NaOH to generate sorbents for the removal of metallic cations in
water bodies. The impact of single and double alteration of both acids has been
explored on the swelling and solubility ability of the modified starch. In addition,
the ability of itaconic acid-substituted starches to adsorb metal cations such as
nickle, cadmium, zinc, and mercury has been checked, and data likened with natural
corn starch (Ma et al. 2015).
The acid hydrolysis has functionalized the starch and/or oxidized to form –
COOH group at six number carbon by nitrogen oxides. Copper ion sorption was
researched as a purpose of composition of hydrogel and other variables. Hydrogels
display a connection between structure and property in the Cu
2+
ion sorption. The
hydrogel showing the peak ion uptake was taken to analyze the impact of the concentration on sorption ability of contact moment, pH, temperature, and Cu
2+
ions
(El-Hamshary et al. 2014). In addition, carboxyl-containing anionic starch
researched its use as a chelating agent. As the acrylic content improved, the sorption
effectiveness of the alkali-treated samples improved. The sorption values relied on
the metal ion for separate heavy metals and followed the order
Hg
2+
> Cu2+ > Zn
2+
> Pb
2+
. The removal efficiency with respect to pH has been
shown in Fig. 2.6 (Kweon et al. 2001).
An innovative cross-linking at the sodium xanthate doped polyacrylamide was
grafted upon starch extracted from corn, the copolymerization of acrylamide (AM)
and sodium xanthate reactions by epichlorohydrin (EPI) as a cross-linking agent
and ceric ammonium nitrate (CAN) as starter. In sewage therapy, the efficiency of
the synthesized hydrogel was explored. Recently, metal anion adsorption mechanisms have been explored by quaternary ammonium amphoteric starch and carboxymethyl groups. The adsorption capability was discovered to be dependent on
solution pH, cross-linked amphoteric starch dose, and original Pb (II) ion concentration. The proposed responses are engaged in the process of preparing (Yin et al.
2008) (Fig. 2.7).
Also used to eliminate chromium VI from aqueous solution were interlinked acid
base starches (CASs). It was discovered that the adsorption method depends on
original pH, Cr (VI), CAS dose, and temperature. In addition, phosphate
2 Polymer Absorbents for Heavy Metal Removal