scholarly journals Sorption behavior of heavy metals on poorly crystalline manganese oxides: roles of water conditions and light

2014 ◽  
Vol 16 (6) ◽  
pp. 1519-1525 ◽  
Author(s):  
Eun-Ju Kim ◽  
Jungwon Kim ◽  
Sung-Chan Choi ◽  
Yoon-Seok Chang
Keyword(s):  
Heavy Metals ◽  
Manganese Oxides ◽  
Sorption Behavior ◽  
Water Conditions ◽  
Uptake And Release

This study investigated Cu(ii) uptake and release in a poorly crystalline δ-MnO2 system based on mechanisms of aggregation and photoinduced dissolution.

scholarly journals Effects of water conditions on the enrichment of heavy metals in wetland soils by Artemisia selengensis

2019 ◽  
Vol 31 (6) ◽  
pp. 1592-1600
Author(s):  
ZHANG Ping ◽  
◽  
ZENG Xianzhe ◽  
WANG Qinyuan ◽  
WANG Wei ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Wetland Soils ◽  
Water Conditions

Sorption behavior of 85Sr onto manganese oxides with tunnel structure

2018 ◽  
Vol 316 (2) ◽  
pp. 673-683 ◽  
Author(s):  
A. I. Ivanets ◽  
V. G. Prozorovich ◽  
T. F. Kouznetsova ◽  
A. V. Radkevich ◽  
P. V. Krivoshapkin ◽  
...  
Keyword(s):  
Manganese Oxides ◽  
Sorption Behavior ◽  
Tunnel Structure

Sorption Behavior of Radionuclides on Crystalline Synthetic Tunnel Manganese Oxides

2000 ◽  
Vol 12 (12) ◽  
pp. 3798-3804 ◽  
Author(s):  
Alan Dyer ◽  
Martyn Pillinger ◽  
Jon Newton ◽  
Risto Harjula ◽  
Teresia Möller ◽  
...  
Keyword(s):  
Manganese Oxides ◽  
Sorption Behavior ◽  
Tunnel Manganese Oxides

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.

Retention and distribution of Cu, Pb, Cr, and Zn in a full-scale hybrid constructed wetland receiving municipal sewage

2013 ◽  
Vol 67 (10) ◽  
pp. 2257-2264
Author(s):  
Haiwen Xiao ◽  
Shengli Zhang ◽  
Jun Zhai ◽  
Qiang He ◽  
Adriaan Mels ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Constructed Wetland ◽  
Manganese Oxides ◽  
Free Water ◽  
Municipal Sewage ◽  
Plant Tissues ◽  
Water Stream ◽  
Wastewater Treatment Process ◽  
Metal Concentrations ◽  
Removal Of Heavy Metals

This study was conducted to investigate the retention and distribution of Cu, Pb, Cr, and Zn in a hybrid constructed wetland (CW) that consists of both vertical baffled flow wetlands (VBFWs) and horizontal subsurface flow wetlands (HSSFs) with unique flow regimes and oxygen distribution. The heavy metal concentrations in water, sediments, and plant tissues in the hybrid CW were analysed. The removal of heavy metals from the water stream in the monitoring period was not statistically significant. Metal concentrations in the sediments generally decreased along the wastewater treatment process. The reductive anaerobic condition in the VBFW may promote the sulphate reduction and form highly insoluble Cu, Pb, and Zn sulphides, resulting in the higher concentration of the bivalent cations in the VBFW sediments than the corresponding values in the HSSF; however, the aerobic and anoxic environments in the HSSF enhanced the removal of Cr with the co-precipitation of iron and manganese oxides, and their hydroxides. Metal concentrations in plant tissues were not significantly influenced by the concentrations in sediments, while roots contained statistically higher metal concentrations than stems and leaves. The sediments stored 94.01, 86.31, 95.85, and 89.51% of the total Cu, Pb, Cr, and Zn retained in the hybrid CW system, respectively, while only small fractions (<10%) were accumulated in the harvestable macrophyte tissues. It is important to clean not only the accessible sediments in free water surface tank and ponds but also the embedded sediments in vegetated beds for the sustainable removal of heavy metals.

An electron microprobe study of the relationships between heavy metals and manganese and iron in soils and ocean floor nodules

Soil Research ◽  
1975 ◽  
Vol 13 (2) ◽  
pp. 177 ◽  
Author(s):  
RM McKenzie
Keyword(s):  
Heavy Metals ◽  
Iron Oxides ◽  
Electron Microprobe ◽  
Manganese Oxides ◽  
Ocean Floor ◽  
Manganese Nodules ◽  
Considerable Fraction

Six soils, six manganese nodules derived from soils and two ocean floor nodules were analysed by electron microprobe techniques to determine inter-element relationships. Cobalt was related to manganese in all samples, and a considerable fraction of the total cobalt in the soils was associated with the manganese oxides. Nickel was related to manganese in all of the nodules and some of the soils. In the soils, although the concentrations of nickel were highest in the manganese oxides, a large proportion of the total nickel was actually associated with the iron oxides. Copper and particularly zinc accumulated in the iron oxides in the soils, but in the nodules these elements were associated with either manganese or iron, and in some cases with neither.

scholarly journals Mining Activities and the Chemical Composition of R. Modonkul, Transbaikalia

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 979
Author(s):  
Zinaida Ivanovna Khazheeva ◽  
Aleksey Maksimovich Plyusnin ◽  
Olga Konstantinovna Smirnova ◽  
Elena Georgievna Peryazeva ◽  
Dashima Ivanovna Zhambalova ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Chemical Composition ◽  
Manganese Oxides ◽  
High Concentration ◽  
Catchment Basin ◽  
Industry Waste ◽  
Major Cations ◽  
Calcium Magnesium ◽  
Physical And Chemical ◽  
The Impact

The Dzhidinsky orefield is located in the Zakamensky district of Buryatia. It is characterized by a high concentration of mineralization in a small area. The ores of the Dzhidinsky economic deposits are complex. This ore field includes Pervomaiskoye Mo, Kholtosonskoe W, and Inkurskoe W deposits. The catchment basin of the river Modonkul is located in the Dzhidinsky orefield. Mineral resource industry waste is a real threat to the city Zakamensk. Currently, the waste of deposits is located at the floodplain terrace and the watershed of the river Modonkul. In this work, the impact of the drainage mine and tributary Inkur on the formation chemical composition of the river Modonkul is studied. The 80 samples of water and suspended matter were taken from a surface of 0–0.5 m on seven sites. Physical and chemical parameters were measured at the sampling sites, and chemical composition was analyzed in the laboratory. In the natural background of the river, the major cations are, in decreasing order, Ca2+ > Mg2+ > Na+ + K+, and major anions are, also in decreasing order, HCO3− > SO42− > Cl−. Along the river, the chemical type of water changes from bicarbonate to sulfate across the sulfate-bicarbonate or bicarbonate-sulfate class and from calcium-magnesium across sodium-calcium-magnesium reverse calcium-magnesium group. Total dissolved solids (TDS) increase by a factor of 4.0–4.7 between the upper and mouth of the river. The dissolved and suspended loads were studied in the mixing zone of acid mine and river water. The different hydrochemistry characteristics may result from Fe, Al, and Mn hydroxide precipitation. The pH values and dissolved oxygen cycles could change the uptake of heavy metals on suspended iron and manganese oxides, and the mechanism of removing it in water. River particulates have the potential of regulating heavy metal inputs to aquatic systems from pollution. The ore elements or the heavy metals are removed from the water in two ways: by the runoff of Modonkul and the sedimentation of suspended material at the bottom. The inflow of mine water into the Modonkul river leads to the rare earth elements (REEs) composition with negative cerium and positive europium anomalies.

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