scholarly journals Abnormal activity of functional groups during uranyl ions sorption by polymethacrylic acid-poly-4-vinylpyridine intergel system

2021 ◽  
Vol 104 (4) ◽  
pp. 47-56
Author(s):  
T.K. Jumadilov ◽  
◽  
A.A. Utesheva ◽  
Kh. Khimersen ◽  
R.G. Kondaurov ◽  
...  
Keyword(s):  
Functional Groups ◽  
Water Environment ◽  
Exchange Capacity ◽  
Polymeric Chain ◽  
Uranyl Ions ◽  
Sorption Activity ◽  
Polymethacrylic Acid ◽  
Effective Dynamic ◽  
Polymeric Hydrogels ◽  
Dynamic Exchange

Uranyl ions sorption by intergel system consisting of polymethacrylic acid hydrogel (hPMAA) and poly-4-vinylpyridine hydrogel (hP4VP) has been studied. First, reciprocal activation of PMAA and P4VP polymeric hydrogels in water environment was examined in order to predict intergel system sorption activity. Based on the obtained results, it was found that area of maximum hydrogel activation was within the ratios of 100 % hPMAA and 67 % hPMAA:33 % hP4VP. The maximum rate of uranyl ions extraction was also observed within these ratios. The highest uranyl ions sorption by intergel system occurred at 83 %hPMAA:17 % hP4VP ratio. Maximum uranyl ions extraction rate after 56 hours of hydrogels remote interaction was 82.5 %, when polymeric chain binding rate was 9.94 % and effective dynamic exchange capacity was 1.12 mmol/g. Significant increase of intergel system sorption activity within the ratios of 100 % hPMAA and 67 % hPMAA:33 % hP4VP in comparison with initial inactivated hydrogels 100 % hPMAA and 100 % hP4VP was confirmed by combined calculation data of extraction rates of inactivated PMAA and P4VP polymeric hydrogels. The obtained results illustrated changes of initial polymeric hydrogels’ electrochemical sorption properties in intergel system leading to functional groups obtaining higher reactive ability, which made it possible to use them for further development of highly efficient uranyl ions extraction sorption technology

scholarly journals FEATURES OF SORPTION OF URANYL IONS BY POLYMETHACRYLIC ACID-POLY-4-VINYLPYRIDINE INTERPOLYMER SYSTEM

2021 ◽  
Vol 73 (1) ◽  
pp. 176-184
Author(s):  
T.K. Jumadilov ◽  
◽  
A.A. Utesheva ◽  
R.G. Kondaurov ◽  
J.V. Gražulevicius ◽  
...  
Keyword(s):  
Exchange Capacity ◽  
Polymeric Chain ◽  
Uranyl Ions ◽  
Kinetic Characteristics ◽  
Polymethacrylic Acid ◽  
Binding Rate ◽  
Effective Dynamic ◽  
Polymeric Hydrogels ◽  
Dynamic Exchange ◽  
Further Development

The sorption extraction of uranyl ions by interpolymer system consisting of polymethacrylic acid hydrogel (hPMAA) and poly-4-vinylpyridine hydrogel (hP4VP) was studied. Sorption and kinetic characteristics of initial polymers and hPMAA-hP4VP intergel system were determined. Maximum uranyl ions extraction rate - 82,8% - is observed in interpolymer system within the ratios of 100% hPMAA and 67% hPMAA:33%hP4VP 56 hours later,when polymeric chain binding rate was 9,97% and effective dynamic exchange capacity was 1,15mmol/g. Obtained outcomes show changes of initial polymeric hydrogels sorption properties ininterpolymer system, which makes it possible to use them for further development of highly efficient uranyl ions extraction sorption technology.

scholarly journals Specific features of uranyl ions extraction by interpolymer system based on polyacrylic acid and polyethyleneimine hydrogels

2021 ◽  
Vol 4 (319) ◽  
pp. 65-71
Author(s):  
A.A. Utesheva ◽  
◽  
J.V. Grazulevicius ◽  
◽  
Keyword(s):  
Polyacrylic Acid ◽  
Exchange Capacity ◽  
Polymeric Chain ◽  
Uranyl Ions ◽  
Polymer Hydrogels ◽  
Binding Rate ◽  
Initial Polymer ◽  
Remote Interaction ◽  
Dynamic Exchange ◽  
Further Development

Uranyl ions sorption of by interpolymer system consisting of polyacrylic acid hydrogel (hPAA) and polyethyleneimine hydrogel (hPEI) has been studied. Rate of uranyl ions extraction by the initial polymers and interpolymer system hPAA-hPEI, polymeric chain binding rate and dynamic exchange capacity of initial polymers and interpolymer system hPAA-hPEI were calculated. Based on obtained outcomes it was found that area of maximum rate of uranyl ions extraction is within the ratios of 67%hPAA:33%hPEI and 33%hPAA:67%hPEI. Maximum uranyl ions extraction rate after 48 hours of hydrogels remote interaction was 90.0 %, when polymeric chain binding rate was 9.1 % and dynamic exchange capacity was 1.14 mmol/g. Rate of uranyl ions extraction by the initial polymer hydrogels 100 % hPAA and 100 % hPEI was 68.0 % and 52.0%. Obtained outcomes showed changes of initial polymeric hydrogels sorption properties in intergel system leading to functional groups obtaining higher reactive ability, which makes it possible to use them for further development of highly efficient uranyl ions extraction sorption technology.

Sorbent based on modified hydrolysis lignin for the purification of wastewater from oil refineries

2021 ◽  
pp. 40-44
Author(s):  
Р.Р. Гималетдинов ◽  
М.Р. Усманов ◽  
С.Ф. Валеев ◽  
В.В. Бодров ◽  
К.Г. Паскару ◽  
...  
Keyword(s):  
Total Content ◽  
Exchange Capacity ◽  
Oil Products ◽  
Hydrolysis Lignin ◽  
Treatment Efficiency ◽  
Hazard Class ◽  
Oil Refineries ◽  
Open Treatment ◽  
Treatment Facilities ◽  
Dynamic Exchange

Представлены результаты исследований применения сорбента «SynergySorb® ПС-1000» на основе модифицированного гидролизного лигнина для очистки сточных вод крупных нефтеперерабатывающих предприятий. За счет развитой системы микро- и мезопор сорбент эффективно поглощает легкие фракции углеводородов, снижая общее содержание нефтепродуктов в сточной воде и интенсивность запаха вблизи открытых очистных сооружений. Полная динамическая обменная емкость сорбента по нефтепродуктам составила 0,605 г/г при фильтрации сточных вод одного из крупных российских нефтеперерабатывающих заводов. Средняя эффективность очистки до проскока нефтепродуктов составила 94%, интенсивность запаха воды в результате испытаний снижена с 5 до 2 баллов. Отработанный сорбент «SynergySorb® ПС-1000» относится к 4 классу опасности (малоопасный) по показателям токсичности и экотоксичности The results of studies of using SynergySorb® PS-1000 sorbent based on modified hydrolysis lignin for the purification of wastewater from large oil refineries are presented. Owing to the developed system of micro- and mesopores, the sorbent effectively absorbs light fractions of hydrocarbons, thus reducing the total content of oil products in wastewater and the intensity of odor near open treatment facilities. The total dynamic exchange capacity of the sorbent for oil products was 0.605 g/g while filtering wastewater from one of the largest Russian oil refineries. The average treatment efficiency before the breakthrough of oil products was 94%, the intensity of effluent odor as a result of tests was reduced from 5 to 2 points. Spent SynergySorb® PS-1000 sorbent belongs to the 4th hazard class (low hazard) in terms of toxicity and ecotoxicity.

Simultaneous immobilization of ammonium and phosphate from aqueous solution using zeolites synthesized from fly ashes

2013 ◽  
Vol 67 (6) ◽  
pp. 1324-1331 ◽  
Author(s):  
X. D. Ji ◽  
M. L. Zhang ◽  
Y. Y. Ke ◽  
Y. C. Song
Keyword(s):  
Sewage Treatment ◽  
Water Environment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Quality Standard ◽  
Exchange Capacity ◽  
Fly Ashes ◽  
Adsorption Processes ◽  
Equilibrium Data ◽  
Intra Particle Diffusion

Zeolites were synthesized from silica-rich (SF-Z) and calcium-rich (CF-Z) fly ashes, respectively, and their performance in immobilizing ammonium and phosphate was investigated through batch experiments. The cation exchange capacity and phosphate immobilization capacity of SF-Z were identified as 2.79 meq/g and 12.97 mg/g while those of CF-Z were 0.69 meq/g and 87.41 mg/g, respectively. The mixture of SF-Z and CF-Z (MSC-Z) immobilized simultaneously ammonium and phosphate, and the ratio of SF-Z to CF-Z depended on the ammonium and phosphate concentrations in wastewater and the discharge standard. The adsorption processes of ammonium and phosphate on MSC-Z followed Ho's pseudo-second-order model and the intra-particle diffusion was a rate-controlling step. The Langmuir model produced better suitability to the equilibrium data. The thermodynamic study revealed that the adsorption of both ammonium and phosphate on MSC-Z was an endothermic reaction. After treatment by MSC-Z, the ammonium and phosphate concentrations in wastewater from a sewage treatment plant decreased from 7.45 and 1.42 mg/L to 2.06 and 0.51 mg/L, respectively, and met Surface Water Environment Quality Standard in China δ. These results show that the immobilization of ammonium and phosphate in wastewater can be achieved by the combination of zeolites synthesized from silica-rich and calcium-rich fly ashes.

Two physical processes enhanced the performance of Auricularia auricula dreg in Cd(II) adsorption: composting and pyrolysis

2019 ◽  
Vol 79 (8) ◽  
pp. 1511-1526
Author(s):  
Yue Li ◽  
Siqi Huang ◽  
Yingnan Wei ◽  
Xuesheng Liu ◽  
Meng Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Surface Structure ◽  
Functional Groups ◽  
Exchange Capacity ◽  
Bet Surface Area ◽  
Order Kinetic ◽  
Auricularia Auricula ◽  
The Difference ◽  
The Impact ◽  
Crystal Species

Abstract This study aims to discover the impact of composting and pyrolysis on the adsorption performance of Auricularia auricula dreg (AAD) for Cd(II) in aqueous solution. Auricularia auricula dreg (AAD), Auricularia auricula dreg biochar (AADB) and Auricularia auricula dreg compost (AADC) were used to remove Cd(II) from aqueous solution, and their adsorption conditions and mechanisms were compared. The adsorption quantity of three adsorbents reached the maximum (AAD: 80.0 mg/g, AADB: 91.7 mg/g, AADC: 93.5 mg/g) under same conditions (adsorbent dosage of 1 g/L, pH 5.0, biosorption temperature of 25 °C, and biosorption time of 120 min). All Cd(II) biosorption processes onto three adsorbents complied with the Langmuir isotherm model and the pseudo-second-order kinetic equation, and spontaneously occurred in an order of AADC > AADB > AAD. The difference in biosorption quantity relied on variation in surface structure, crystal species and element content caused by composting or pyrolysis. Composting enhanced the changes in surface structure, crystal species, functional groups and ion exchange capacity of the AAD, resulting in AAD had greatly improved the biosorption quantity of Cd(II). Pyrolysis increased the adsorption of Cd(II) mainly by increasing the Brunauer–Emmett–Teller (BET) surface area, the particle size and pH, in the same time, providing more oxygen-containing functional groups.

The Use of Aluminosilicate Sorbent for the Purification of Natural Waters from Heavy Metals

2020 ◽  
Vol 24 (3) ◽  
pp. 19-23 ◽  
Author(s):  
A.S. Kutergin ◽  
T.A. Nedobukh
Keyword(s):  
Heavy Metals ◽  
Drinking Water ◽  
Water Treatment ◽  
Mechanical Strength ◽  
Natural Waters ◽  
Drinking Water Treatment ◽  
Exchange Capacity ◽  
Filtration Process ◽  
Treated Water ◽  
Dynamic Exchange

The possibilities of using natural granular glauconite in standard water treatment schemes have been investigated. Resource tests of the studied material were carried out in dynamics, simulating possible conditions of use. As a result of the experiments, it was established: during the filtration process, alkalization of water occurs, but the result does not exceed pH = 6÷9, which are the norm for drinking water; the use of a sorbent based on natural glauconite does not impair the hardness indicator of the treated water. The dynamic exchange capacity was: for iron – 3.09 mg/g of absorbent, copper – 19.15 mg/g of absorbent, zinc – 4.82 mg/g of absorbent. The resource of the filter was determined with the loading of granulate with a volume of 1 dm3: for iron – 2918 dm3, for copper – 5425 dm3, for zinc – 273 dm3. The mechanical strength acquired by the sorbent as a result of granulation made it possible to wash the load by the countercurrent method, freeing intergranular pores from the sediment accumulated in them. The revealed capabilities of granular glauconite will allow its use in drinking water treatment schemes for purifying natural waters from heavy metals: iron, zinc, copper.

scholarly journals Electoplating plants’ wastewater treatment from copper ions with a modified carbonaceous slurry

2019 ◽  
Author(s):  
Keyword(s):  
Copper Ions ◽  
Exchange Capacity ◽  
Dynamic Conditions ◽  
Sorption Material ◽  
Secondary Pollution ◽  
Isotherm Of Adsorption ◽  
Dynamic Exchange ◽  
Chemical Water ◽  
Water Passage ◽  
Material Extract

The article presents a technique of the granulated sorption material production based on the chemical water treatment slurry. The sorption has been studied in statical and dynamic conditions. The sorption effectiveness by copper ions was 90.5 %. The isotherm of adsorption and a curve of adsorption in dynamic conditions of cations of copper has been plotted by the granulated material. During the experiment the dynamic exchange capacity, full exchange capacity of the granulated material has been determined. The filtrate quality indicators in water passage through sorption material loads in accordance with MPC of domestic drinking and recreational purposes water bodies. The granulated sorption material extract was tested for acute lethal toxicity for Poecilia Reticulate Peters fish and Daphnia Magna Crustacea. The obtained results affirmed that the granulated sorption material was not practically hazardous and did not bring secondary pollution to wastewaters. The authors have presented a technological scheme of electroplating wastewaters ion-exchange treatment.

scholarly journals Coke-Based Carbon Sorbent: Results of Gold Extraction in Laboratory and Pilot Tests

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 508 ◽  
Author(s):  
Svetlana Yefremova ◽  
Alma Terlikbayeva ◽  
Abdurassul Zharmenov ◽  
Askhat Kablanbekov ◽  
Lara Bunchuk ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Noble Metals ◽  
Total Pore Volume ◽  
Freundlich Isotherm ◽  
Exchange Capacity ◽  
Carbon Sorbent ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Gold Extraction ◽  
Dynamic Exchange

Coke-based carbon sorbent (CBCS) was produced using special coke fines with the following characteristics: ash, 4.5%; iodine adsorption capacity, 52%; specific surface area, 600 m2 g−1; and total pore volume, 0.4 cm3 g−1. Gold adsorption from real production cyanide solutions in batch and column laboratory experiments was studied. The optimum adsorbent/solution ratio was 0.2 g/20 cm3. Sorption equilibrium occurred after 60 min of phase-time contact. The CBCS maximum adsorption capacity for gold was found to be 1.2 mg g−1. Both the Langmiur and Freundlich isotherm models confirmed that gold adsorption by CBCS proceeds favorably, but the Freundlich isotherm best describes the adsorption equilibrium. The CBCS dynamic exchange capacity (100 g t−1) and full dynamic exchange capacity (4600 g t−1) for gold were determined in column tests. It was revealed using SEM that adsorbate was retained in sorbent pores. The possibility of completely eluting gold from CBCS was demonstrated. A CBCS pilot test to recover gold from 200 dm3 of the cyanide solution containing (mg dm−3) 2.6 Au, 0.42 Ag, and 490 Cu was carried out. The total amount of noble metals (Au + Ag) adsorbed was 99.99% and gold ions was 94%. The CBCS maximum adsorption capacity for gold reached 2900 g t−1.

Association of Uranyl Ions with Amino Functional Groups

2009 ◽  
Vol 38 (2) ◽  
pp. 152-153 ◽  
Author(s):  
Naofumi Kozai ◽  
Toshihiko Ohnuki
Keyword(s):  
Functional Groups ◽  
Uranyl Ions
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