scholarly journals Purification of water and fertile soil with bentonite-like clays of the Belgorod Region

2021 ◽  
Vol 30 ◽  
pp. 02001
Author(s):  
Alexandr Vezentsev ◽  
Natalia Volovicheva ◽  
Svetlana Korolkova ◽  
Lidiia Peristaya ◽  
Vitaliy Milyutin ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Sorption Purification ◽  
Cesium Radionuclides ◽  
Sorption Ability ◽  
Natural Clays ◽  
Bentonite Clays ◽  
Natural Clinoptilolite ◽  
Effective Sorbent

This paper presents the results of a comparative assessment of the effectiveness of sorption purification of aquatic medium and fertile soils using native forms of bentonite clays of deposits in the Belgorod region (Russia) from heavy metal ions (Cu2+, Fe3+, Cr3+, Pb2+) and radionuclides (137Cs, 85Sr, 233U и 239Pu). It was revealed that during the sorption of heavy metal ions (Cu2+, Fe3+ и Cr3+) from model water systems, the most absorbing activity is shown by the natural clays of the Polyana and Nelidovka deposits, which have almost the same ability to absorb heavy metal ions. The purification efficiency of the model aqueous solutions from these cations taken at an initial concentration of 0.1 mmol/l reaches 95%. It was established that the natural clay of the Polyana deposit is also an effective sorbent for the purification of solutions from cesium radionuclides. In terms of sorption ability, the studied sample is 5 times superior to natural clinoptilolite, which is most often used to purify solutions from radiocesium.. It was revealed that with an increase in the amount of added sorbents, the detoxification effect is increased, that is, the content of heavy metals in the green mass decreases.

scholarly journals Poly (Amidehydrazide) Hydrogel Particles for Removal of Cu2+ and Cd2+ Ions from Water

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 121
Author(s):  
Hojung Choi ◽  
Taehyoung Kim ◽  
Sang Youl Kim
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Suspension Polymerization ◽  
Polymerization Process ◽  
New Class ◽  
Hydrogel Particles ◽  
Ion Sorption ◽  
Hyperbranched Poly ◽  
Sorption Ability

Poly(amidoamine)s (PAMAM) are very effective in the removal of heavy metal ions from water due to their abundant amine and amide functional groups, which have a high binding ability to heavy metal ions. We synthesized a new class of hyperbranched poly(amidehydrazide) (PAMH) hydrogel particles from dihydrazides and N,N′-methylenebisacrylamide (MBA) monomer by using the A2 + B4 polycondensation reaction in an inverse suspension polymerization process. In Cd2+ and Cu2+ ion sorption tests, the synthesized dihydrazide-based PAMH hydrogel particles exhibited sorption capacities of 85 mg/g for copper and 47 mg/g for cadmium. Interestingly, the PAMH showed only a 10% decrease in sorption ability in an acidic condition (pH = 4) compared to the diamine-based hyperbranched PAMAM, which showed a ~90% decrease in sorption ability at pH of 4. In addition, PAMH hydrogel particles remove trace amounts of copper (0.67 ppm) and cadmium (0.5 ppm) in water, below the detection limit.

scholarly journals Sorption Purification of Solutions from Heavy Metal Ions Using Zeolite Modified by Carbon Nanotubes.

2019 ◽  
Vol 11 (2) ◽  
pp. 16-27
Author(s):  
T. Dyachkova ◽  
◽  
I. Makarova ◽  
E. Vaganova ◽  
O. Davydova ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Sorption Purification

scholarly journals Superabsorbent Hydrogels for Heavy Metal Removal

2021 ◽  
Author(s):  
Tanzil Ur Rehman ◽  
Luqman Ali Shah ◽  
Noor Saeed Khattak ◽  
Abbas Khan ◽  
Noor Rehman ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Metal Removal ◽  
Ph Effect ◽  
Polymer Networks ◽  
Sorption Ability ◽  
Heavy Metal Ion Removal ◽  
Superabsorbent Hydrogels

The superabsorbent hydrogels (SAHs) are 3D polymer networks having hydrophilic nature, which can swell, absorb, and hold incredible amount of water in aqueous medium showing better sorption ability. The sorption ability enables SAH to absorb organic pollutants, dyes, and heavy metal ions (HMI) from wastewater. Therefore, SAHs have recently got considerable interest from the researchers to be used for wastewater treatment. In order to know the swelling property and to understand the wastewater treatment in general and heavy metal ion removal from industrial effluent in particular, this chapter describes the removal of heavy metal ions from wastewater in details. Thus this chapter will enable us to understand the theoretical and experimental part regarding the removal of heavy metal ions by SAH from wastewater. It also highlights the parameters of adsorption process such as effect of initial concentration of heavy metal ions, effect of external stimuli (pH), effect of temperature on the removal of heavy metal ions, and dosage studies. The synthesis of SAH and its use for removal of heavy metal ions from wastewater as well as recycling, selectivity, and effectiveness are also discussed in detail.

Sorption Ability of Carbon Fibrous Material to Remove Heavy Metal Ions and Oil Products from Sewage

2017 ◽  
Vol 2017 (13) ◽  
pp. 1161-1164
Author(s):  
A. I. Syutova ◽  
S. Ya. Alibekov ◽  
N. P. Syutov ◽  
G. P. Fetisov
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Fibrous Material ◽  
Oil Products ◽  
Sorption Ability

Sorption Purification of Effluent Water From Heavy Metal Ions by Modified Natural Zeolites

2017 ◽  
Vol 6 (2) ◽  
pp. 56-61 ◽  
Author(s):  
Обуздина ◽  
Marina Obuzdina ◽  
Руш ◽  
E. Rush ◽  
Шалунц ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Water Purification ◽  
Heavy Metal Ions ◽  
Point Of View ◽  
Effluent Water ◽  
Solution Ph ◽  
Economic Point ◽  
Sorption Purification ◽  
Cu Ions

Features of sorption method of effluent water purification are considered. Analysis of technologies of effluent water purification from heavy metalsionsis presented. Physico-chemical regularities of sorption of Zn, Ni, Cu ions are investigated. As sorbents it is proposed to use zeolites of Holinsky deposits, modified by sulfur polymer, obtained from waste of epichlorohydrin production. This will allow simultaneously solving two problems: elimination of waste and wastewater purification, which is significantly advantageous from the economic point of view. Kinetic curves of sorption of Zn, Ni, Cu ions in different solution concentrations are presented. Also the adsorption process of heavy metal ions from solutions of chemically modified zeolites in the evaluation of the influence of various factors (the contact time of sorbent with solution, pH and temperature) are investigated.

scholarly journals Water purification from heavy metal ions by nano-sized Fe0/kaolinite composites

2020 ◽  
pp. 96-103
Author(s):  
I.A. Kovalchuk ◽  
◽  
V.Yu. Tobilko ◽  
A.I. Bondarieva ◽  
Yu.M. Kholodko ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Sorption Isotherms ◽  
Active Surface ◽  
Toxic Heavy Metal ◽  
Physicochemical Features ◽  
Sorbent Materials ◽  
Effective Sorbent ◽  
Sorption Characteristics

We have investigated the physicochemical features of the purification of wastewater that are complex on its content and include a mixture of heavy metal ions (Cu(II), Cd(II), Zn(II), Co(II), Cr(VI)). The phase of a composition and structural-sorption characteristics of synthesized nano-sized Fe0/kaolinite composites were studied. It was found that the obtained materials have much better sorption properties for the extraction of heavy metals from aqueous solutions in comparison with natural kaolinite. Calculations of sorption isotherms according to the Freundlich equation are done. Based on isotherms, the average values of specific sorption per unit of an active surface of the mineral at the content of heavy metal ions in the initial solutions of 300 μmol/dm3 were determined. They range from 0.42 to 17.1 μmol/g for Cr(VI) to Cu(II) ions. It has also been found that similar values for the modified samples are much larger and range from 13.8 to 80.27 μmol/g for ions from Cr(VI) to Cu(II). It is shown that composite sorbents based on nano-sized zero-valent iron and dispersed kaolinite silicate are effective sorbent materials for the purification of water contaminated with toxic heavy metal ions that are commonly found in wastewater of the galvanic and hydrometallurgical industries.

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