Experimental study of the selective adsorption of heavy metals onto clay minerals

2000 ◽  
Vol 19 (2) ◽  
pp. 105-109 ◽  
Author(s):  
Hongping He ◽  
Jiugao Guo ◽  
Xiande Xie ◽  
Jinlian Peng
Keyword(s):  
Heavy Metals ◽  
Experimental Study ◽  
Clay Minerals ◽  
Selective Adsorption

Heavy metals sorption/desorption on competing clay minerals; an experimental study

1995 ◽  
Vol 9 (5) ◽  
pp. 369-381 ◽  
Author(s):  
E. Helios Rybicka ◽  
W. Calmano ◽  
A. Breeger
Keyword(s):  
Heavy Metals ◽  
Experimental Study ◽  
Clay Minerals

Application of iron-coated sand on the treatment of toxic metals

2004 ◽  
Vol 4 (5-6) ◽  
pp. 335-341 ◽  
Author(s):  
Jae-Kyu Yang ◽  
Yoon-Young Chang ◽  
Sung-Il Lee ◽  
Hyung-Jin Choi ◽  
Seung-Mok Lee
Keyword(s):  
Heavy Metals ◽  
Selective Adsorption ◽  
Complete Removal ◽  
Batch Adsorption ◽  
Column Experiments ◽  
Adsorption Behaviour ◽  
Optimum Amount ◽  
Initial Ph ◽  
New Treatment ◽  
Coated Sand

Iron-coated sand (ICS) prepared by using FeCl3 and Joomoonjin sand widely used in Korea was used in this study. In batch adsorption kinetics, As(V) adsorption onto ICS was completed within 20 minutes, while adsorption of Pb(II), Cd(II), and Cu(II) onto ICS was slower than that of As(V) and strongly depended on initial pH. At pH 3.5, ICS showed a selective adsorption of Pb(II) compared to Cd( II) and Cu(II) . However, above pH 4.5, near complete removal of Pb(II), Cd(II), and Cu(II) was observed through adsorption or precipitation depending on pH. As(V) adsorption onto ICS occurred through an anionic-type and followed a Langmuir-type adsorption behaviour. In column experiments, pH was identified as an important parameter in the breakthrough of As(V). As(V) breakthrough at pH 4.5 was much slower than at pH 9 due to a strong chemical bonding between As(V) and ICS as similar with batch adsorption behaviour. With variation of ICS amounts, the optimum amount of ICS at pH 4.5 was identified as 5.0 grams in this research. At this condition, ICS could be used to treat 200 mg of As(V) with 1 kg of ICS until 50 ppb of As(V) appeared in the effluent. In this research, as a new treatment system, ICS can be potentially used to treat As(V) and cationic heavy metals.

Efficient, stable and selective adsorption of heavy metals by thio-functionalized layered double hydroxide in diverse types of water

2018 ◽  
Vol 332 ◽  
pp. 387-397 ◽  
Author(s):  
Jawad Ali ◽  
Huabin Wang ◽  
Jerosha Ifthikar ◽  
Aimal Khan ◽  
Ting Wang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Layered Double Hydroxide ◽  
Selective Adsorption ◽  
Double Hydroxide

scholarly journals The Fabrication of Calcium Alginate Beads as a Green Sorbent for Selective Recovery of Cu(Ⅱ) from Metal Mixtures

Crystals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 255 ◽  
Author(s):  
Niannian Yang ◽  
Runkai Wang ◽  
Pinhua Rao ◽  
Lili Yan ◽  
Wenqi Zhang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Calcium Alginate ◽  
Selective Adsorption ◽  
Optical Emission ◽  
Alginate Beads ◽  
Emission Spectrometry ◽  
Sorption Behavior

Calcium alginate (CA) beads as a green sorbent were easily fabricated in this study using sodium alginate crosslinking with CaCl2, and the crosslinking pathway was the exchange between the sodium ion of α-L-guluronic acid and Ca(II). The experimental study was conducted on Cu(II), Cd(II), Ni(II) and Zn(II) as the model heavy metals and the concentration was determined by inductively coupled plasma optical emission spectrometry (ICP-OES). The characterization and sorption behavior of the CA beads were analyzed in detail via using scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The adsorption experiments demonstrated that the CA beads exhibited a high removal efficiency for the selective adsorption of Cu(II) from the tetra metallic mixture solution and an excellent adsorption capacity of the heavy metals separately. According to the isotherm studies, the maximum uptake of Cu(II) could reach 107.53 mg/g, which was significantly higher than the other three heavy metal ions in the tetra metallic mixture solution. Additionally, after five cycles of adsorption and desorption, the uptake rate of Cu(II) on CA beads was maintained at 92%. According to the properties mentioned above, this material was assumed to be applied to reduce heavy metal pollution or recover valuable metals from waste water.

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