Metal ion absorption of carboxymethylcellulose gel formed by γ-ray irradiation

Kinetic studies on the adsorption of Cu(ll) onto alginate-carboxymethyl cellulose membrance

“…SA has attracted considerable attentions and has been used as an adsorbent for heavy metal ions [7] . CMC has also been reported as adsorbent for metal ions such as Cu, Cd, and Pb [8][9][10] . However, to our knowledge, no work has been done with alginate-carboxymethyl cellulose membranes (AC membranes) as an adsorbent.…”

Capturing of Positive and Negative Rare-metal Ions by Polarity-Composite Hydrogels

“…In the authors' previous studies, measured were the heavy metal capturing efficiencies both of the positively [9,10,17,18,21] and negatively [11][12][13][14][15][16][19][20][21] ionized hydrogels: The heavy-metal cation capturing efficiency of sodium acrylate/acrylamide (SA/AAm) and carboxymethylcellulose (CMC-Na) gels were found to be ~20 wt% of network polymer [9] [10,21]. As for the heavy-metal-anion capturing hydrogels [11][12][13][14][15][16][19][20][21], their capturing efficiencies are larger than those of SA/AAm and CMC-Na gels, which are much larger than those of zeolites and ion-exchange resins.…”

UV-irradiation Effects on the Properties of <i>poly</i>-Acrylamide/Sodium Acrylate Gel

“…First, the authors started the investigations of heavymetal-cation capturing properties of some ionized hydrogels such as sodium acrylate/acrylamide (SA/AAm) and sodium carboxymethylcellulose (CMC-Na) gels; and they found that the ionized gels can capture cupric ion to the extent of ~20wt% of their network, which is considerably large compared with other adsorbents such as zeolites and ion-exchange resins (Fig.1) [7,8]. In addition to the heavy-metal-cation capturing hydrogels, the authors have been also investigating heavy-metalanion capturing hydrogels because there are many harmful heavy-metal anions in the environment such as Cr 2 O 7 2-; and they found that some heavy-metal-anion adsorbing hydrogels show larger heavy-metal capturing efficiencies than SA/AAm and CMC-Na gels [9][10][11][12][13][14].…”

“…1 The CuCl2 concentration dependence of the Cu(II) weight adsorbed by the several SA/ AAm gels per 10 g of the respective pre-gel solutions [7,8]. The symbols, • , □ and ＊ denote the data of the SA/AAm gels with molar ratios SA:AAm=1:6, 2:5, 3:4, respecttively.…”

“…However, the detector was not able to show how much the heavy-metal amount the gel can adsorb. In these circumstances, the authors have been focusing attention on the adsorbable quantity of the heavy-metal-capturing gels aiming at the realizetion of the high-efficient heavy-metal recovery gels [7][8][9][10][11][12][13][14][15][16][17][18].…”