scholarly journals Research of nanostructural minerals – bentonites used in purification of mineral water from heavy metal ions (Cu2+, Pb2+, Cd2+, Zn 2+)

2020 ◽  
Vol 4 (78) ◽  
pp. 115-122
Author(s):  
A. SH. BUKUNOVA ◽  
◽  
G. ZH. TURSBEKOVA ◽  
L. B. IRISKINA ◽  
M. K. ZHAMANBAEVA ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Mine Water ◽  
Heavy Metal Ions ◽  
Structural Characteristics ◽  
Mining Industry ◽  
Bentonite Clay ◽  
Acid Activation ◽  
Exchange Cations ◽  
Aluminum Ions

This paper presents the results of studies on the use of bentonite from the Taganskoye field for purification of mine water from the mining industry from heavy metal ions (MI). It has been established that the use of the thermo-acid-activated form of bentonite clay allows the removal of MI Cu2+, Pb2+, Cd2+, Zn2+ions from mine water by 99.6, 94.7, 98.9, 99.5 %, respectively, which ensures that the maximum permissible concentration of fishery is achieved at selected optimal conditions that were identified on the basis of an active experiment. A comparative analysis of the presented results of mass spectrometry and scanning electron microscopy shows that they are valid and do not contradict the obtained experimental data on the composition of exchange cations and structural characteristics in ultrafine mineral phases of bentonite clay samples of natural and thermo-acid activated forms It has been established that during acid activation of bentonite clays, the structure of montmorillonite is retained upon extraction of up to 80 % of magnesium, iron, and aluminum ions and is destroyed only upon their almost complete extraction.

Interactions of bentonite clay in composite gels of non-ionic polymers with cationic surfactants and heavy metal ions

2014 ◽  
Vol 293 (2) ◽  
pp. 633-639 ◽  
Author(s):  
M. M. Beisebekov ◽  
S. B. Serikpayeva ◽  
Sh. N. Zhumagalieva ◽  
M. K. Beisebekov ◽  
Zh. A. Abilov ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Cationic Surfactants ◽  
Heavy Metal Ions ◽  
Bentonite Clay ◽  
Ionic Polymers ◽  
Composite Gels

Retracted Article: One-pot synthesis of O-doped BN nanosheets as a capacitive deionization electrode for efficient removal of heavy metal ions from water

2017 ◽  
Vol 5 (32) ◽  
pp. 17029-17039 ◽  
Author(s):  
Ming Ming Chen ◽  
Da Wei ◽  
Wei Chu ◽  
Tao Wang ◽  
Dong Ge Tong
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Structural Characteristics ◽  
Capacitive Deionization ◽  
Efficient Removal ◽  
One Pot ◽  
One Pot Synthesis ◽  
Retracted Article ◽  
Coordination Ability

BNO nanosheets could capacitively remove multiple metal ions from water due to their unique structural characteristics and coordination ability.

scholarly journals Sorption of Heavy Metal Ions by Composite Materials Based on Polycarboxylic Acids and Bentonite Clay

2021 ◽  
Vol 23 (1) ◽  
pp. 19
Author(s):  
Sh. N. Zhumagaliyeva ◽  
R. S. Iminovа ◽  
G. Zh. Kairalapova ◽  
B. M. Kudaybergenova ◽  
Zh. A. Abilov
Keyword(s):  
Heavy Metal ◽  
Composite Materials ◽  
Metal Ions ◽  
Functional Groups ◽  
Heavy Metal Ions ◽  
Bentonite Clay ◽  
Clay Content ◽  
Composite Gels ◽  
Polycarboxylic Acids ◽  
Study Results

The paper shows the study results of sorption capacities of composite gels based on polyacrylic and polymethacrylic acids with bentonite clay as the mineral filler concerning heavy metal ions (Pb+2, Cu+2, Ni+2, Zn+2, Fe+2, Cd+2). The binding of metal ions to gels occurs through the formation of electrostatic bonds between the charged surface of bentonite clay and ionogenic functional groups of polymers in the composition, as well as the coordination bonds between metal ions and unshared pairs of oxygen electrons in the functional groups of polymers. The gel swelling degree decreases in metal solutions with increasing metals concentration and the content of BC in the composite. The sorption and desorption of heavy metal ions from the polymer-clay composites from model solutions and samples of industrial wastewater from the Kazakhstani metallurgical plants were evaluated. The adjustment of the pH, the temperature of the medium and the clay content in the composite leads to increasing the degree of sorption and achieving regeneration of the used composite gels in certain media. The data obtained testify to the prospects of using these composites as effective sorbents of heavy metals from industrial wastewaters expanding the range of composite materials for wastewater treatment.

The Studies of Adsorption of Heavy Metal Ions of Lead and Copper by Distillers' Grains

2011 ◽  
Vol 695 ◽  
pp. 77-80 ◽  
Author(s):  
Juan Feng ◽  
Xiao Yan Lin ◽  
Xue Gang Luo ◽  
Jia Quan Rao ◽  
Chun Yan Zhang
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Removal Rate ◽  
Structural Characteristics ◽  
Sorption Isotherms ◽  
Distillers Grains ◽  
Sorption Data ◽  
Adsorption Behaviors ◽  
Heavy Metal Wastewater

The absorption of Cu2+ and Pb2+ in the heavy metal wastewater by distillers' grains can not only solve the problem of environmental pollution, but also change distillers' grains waste into resource. Structural characteristics of distillers' grains and its adsorption behaviors for the heavy metal ions of Cu2+ and Pb2+ were studied and effects of various parameters including pH, temperature, distillers' grains dose, initial Cu2+ and Pb2+ concentration and absorbed time on the absorption of Pb2+ and Cu2+ were evaluated. Sorption isotherms were also investigated. Results show that the rough surface, loose internal structure and hydroxy and amide groups of the distillers' grains are beneficial to the adsorption of Cu2+ and Pb2+ in the wastewater. The removal rate of the distillers' grains for Pb2+ (20.00 mg L−1) and Cu2+ (20.00 mg L−1) are, respectively, 96.72% and 87.70% under optimized conditions. The equilibrium sorption data are well demonstrated by Langmuir model.

A Portable Analytical System for Colorimetric Detection of Metal Ions in Water

2014 ◽  
Author(s):  
Chen Zhao ◽  
Guowei Zhong ◽  
Da-Eun Kim ◽  
Jinxia Liu ◽  
Xinyu Liu
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Limit Of Detection ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Human Beings ◽  
Aluminum Ions ◽  
Analytical System

Heavy metal ions released into various water environments have severe impact on both human beings and aqueous environments, and excess amount of lead and aluminum ions pose high risks to human health and could cause life-threatened diseases. The existence of metal ions in drinking water contributes most to the daily intake by humans, and thus it urges to develop a rapid, low-cost and sensitive method for detection of heavy metal ions. In this research, we develop a portable analytical system for metal ion detection in water by combining a powerful gold nanoparticle (AuNP) based colorimetric method with lab-on-a-chip technology. We utilize single-step assays involving surface functionalized AuNPs for colorimetric detection of lead (Pb2+) and aluminum (Al3+) ions in water with low limit of detection (LOD) and high sensitivity. We demonstrate that this portable system provides LODs of 30 ppb for Pb2+ and 89 ppb for Al3+, both comparable to bench-top analytical spectrometers. The system permits metal ion detections in a more economical and convenient fashion, and is particularly useful for water quality monitoring in remote and/or resource-poor settings.

scholarly journals Heavy metal ions adsorption from mine waters by sawdust

2009 ◽  
Vol 15 (4) ◽  
pp. 237-249 ◽  
Author(s):  
Velizar Stankovic ◽  
Dragana Bozic ◽  
Milan Gorgievski ◽  
G. Bogdanovic
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Mine Water ◽  
Heavy Metal Ions ◽  
Mine Drainage ◽  
Copper Ions ◽  
Supporting Electrolyte ◽  
Mine Waters ◽  
Copper Mine ◽  
Column Adsorption

In this work the results on the batch and column adsorption of copper and some associated ions by employing linden and poplar sawdust as a low-cost adsorbent are presented. The mine water from a local abandoned copper mine, as well as synthetic solutions of those ions which are the main constituents of the mine water were both used as a model-system in this study. The adsorption ability of the chosen sawdust to adsorb heavy metal ions is considered as a function of the initial pH of the solution and kind of metal ions. At lower pH of solutions the adsorption percentage (AD %) decreases leading to a zero AD % at pH < 1.1. Maximum AD % is achieved at 3.5 < pH < 5. It was found that poplar and linden sawdust have both almost equal adsorption capacities against copper ions. The highest AD % ( ?80%) was achieved for Cu2+, while for Fe2+ it was slightly above 10%. The other considered ions (Zn2+ and Mn2+) were within this interval. The results obtained in the batch mode were verified through the column test by using the real mine water originating from an acid mine drainage (AMD) of the copper mine 'Cerovo', RTB Bor. The breakthrough curves are presented as a function of the aqueous phase volume passed through the column allowing having an insight into the column adsorption features. Breakthrough points were determined for copper, manganese and zinc ions. A very high adsorption degree - higher than 99% was achieved in these experiments for all mentioned ions. After completing the adsorption, instead of desorption, the loaded sawdust was drained, dried and burned; the copper bearing ash was then leached with a controlled volume of sulphuric acid solution to concentrate copper therein. The obtained leach solution had the concentration of copper higher than 15 g dm-3 and the amount of H2SO4 high enough to serve as a supporting electrolyte suitable to be treated by the electrowinning for recovery of copper. The technology process based on the column adsorption is proposed and discussed.

scholarly journals Analysis of sorption capacity of natural sorbents in relation to aqueous solutions of heavy metal compounds

2021 ◽  
pp. 111-119
Author(s):  
O. M. Khomenko ◽  
O. V. Yehorova ◽  
O. O. Mysliuk
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Surface Water ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Sorption Capacity ◽  
Heavy Metal Ions ◽  
Chloride Solution ◽  
Bentonite Clay ◽  
Chemical Processing

The main preconditions emergence of an environmental crisis in the country due to surface water pollution include irrational use of water resources in violation of the environmental requirements, discharge of untreated and insufficiently treated industrial and municipal wastewater into water bodies and inflow of polluting substances from agricultural lands as a result of surface water drainage. The whole set of considered factors leads to depletion and pollution of surface water of Ukraine, reduction of their self-cleaning capacity, degradation, impoverishment and collapse of aquatic ecosystems. Excessive content of heavy metal ions in surface water has a negative impact on the environment, causing acute and chronic diseases. Ingress of such pollutants into surface water is almost entirely due to anthropogenic economic activity. Wastewater from chemical, ferrous and nonferrous metallurgy brings a great amount of such pollutants. Among various methods used for removing heavy metal ions from aqueous media, sorption methods remain one of the most effective and popular, mainly due to the fact that they ensure a high degree of purification at relatively low costs. Along with the adsorbents traditionally involved in these processes, a number of studies and practical implementations with use of natural dispersed minerals as adsorbents were conducted lately. The research aims at studying the sorption capacity and efficiency of natural and modified sorbent such as bentonite clay for purification of aqueous solutions containing heavy metal ions in the form of dissolved compounds and justifying its potential application. It studies the efficiency of wastewater treatment aimed at removing heavy metal ions by the natural clay sorbent of bentonite clays of the Cherkaskyi Deposit (Dashukovskyi deposit). The paper presents a technique for modification of bentonite clay in order to increase its adsorption capacity for heavy metal ions using the following three methods: physical (thermal), chemical (processing with application of Iron(III) chloride solution) and combined (thermal processing of the original sorbent followed by processing with application of Iron(III) chloride solution). It has been experimentally proved that a natural sorbent modified via thermal and chemical processing is characterized by a high absorption capacity to heavy metal ions contained in water solutions, in particular to chromium(VI) ions, copper(II) ions and aluminum(III) ions with the purification degree ranging from 5% to 83%. The highest adsorption rate, 83%, is demonstrated by the combined method of bentonite clay modification, therefore proving the effectiveness of application of environmentally friendly natural sorbents for wastewater treatment processes aimed at removing heavy metal ions. The paper indicates the advantages of wastewater treatment sorption methods allowing removal of pollutants of different origin and any concentration.

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