Effective uranium(vi) sorption from alkaline media using bi-functionalized silica-coated magnetic nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (70) ◽  
pp. 56658-56665 ◽  
Author(s):  
X. T. Chen ◽  
L. F. He ◽  
R. Z. Liu ◽  
C. Zhang ◽  
B. Liu ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Sorption Capacity ◽  
Alkaline Media ◽  
Functionalized Silica ◽  
Magnetic Iron Oxide ◽  
Maximum Sorption Capacity ◽  
Oxide Composite ◽  
Maximum Sorption

A bi-functionalized magnetic iron oxide composite has been employed for uranium(vi) sorption from alkaline media. The maximum sorption capacity was observed at pH 9.0 with a capacity of 70.7 mg g−1atcU(vi)initial= 21.7 mg L−1.

Природные материалы для сорбционной очистки хром- и кадмийсодержащих инфильтратов полигонов ТБО

2019 ◽  
pp. 13-19
Author(s):  
A. Safonov ◽  
N. Andriushchenko ◽  
N. Popova ◽  
K. Boldyrev
Keyword(s):  
Sorption Capacity ◽  
Electron Acceptors ◽  
Bacterial Cells ◽  
Maximum Sorption Capacity ◽  
Sorption Material ◽  
Maximum Sorption ◽  
Properties Of Materials ◽  
Solid Waste Landfills ◽  
Sorption Characteristics

Проведен анализ сорбционных характеристик природных материалов (вермикулит, керамзит, перлит, цеолит Трейд ) при очистке кадмий- и хромсодержащих сточных вод с высокой нагрузкой по ХПК. Установлено, что цеолит обладает максимальными сорбционными характеристиками для Cd и Cr и наименьшим биологическим обрастанием. При использовании вермикулита и керамзита или смесей на их основе можно ожидать увеличения сорбционной емкости для Cd и Сr при микробном обрастании, неизбежно происходящем в условиях контакта с водами, загрязненными органическими соединениями и биогенами. При этом биообрастание может повысить иммобилизационную способность материалов для редоксзависимых металлов за счет ферментативных ресурсов бактериальных клеток, использующих их в качестве акцепторов электронов. Эффект микробного обрастания разнонаправленно изменял параметры материалов: для Cr в большинстве случаев уменьшение и для Cd значительное увеличение. При этом дополнительным эффектом иммобилизации Cr является его биологическое восстановление биопленками. Варьируя состав сорбционного материала, можно подбирать смеси, оптимально подходящие для очистки вод инфильтратов с полигонов твердых бытовых отходов с высокой нагрузкой по ХПК и биогенным элементам как при использовании in situ, так и в системах на поверхности.The analysis of the sorption characteristics of natural materials (vermiculite, expanded clay, perlite, Trade zeolite) during the purification of cadmium and chromium-containing leachate with a high COD load was carried out. It was determined that zeolite had the maximum sorption capacity for Cd and Cr and the lowest biological fouling. When using vermiculite and expanded clay or mixtures on their basis, one can expect an increase in the sorption capacity for Cd and Cr during microbial fouling that inevitably occurs during contacting with water polluted with organic compounds and nutrients. In this case biofouling can increase the immobilization properties of materials for redox-dependent metals due to the enzymatic resources of bacterial cells that use them as electron acceptors. The effect of microbial fouling changed the parameters of materials in different directions: for Cr, in most cases, downward, and for Cd, significantly upward. Moreover, chromium biological recovery by biofilms is an additional effect of immobilization. Varying the composition of the sorption material provides for selecting mixtures that are optimally suitable for the purification of leachates from solid waste landfills with high COD and nutrients load, both when used in situ and in surface systems.

scholarly journals Phosphate Removal Using Polyethylenimine Functionalized Silica-Based Materials

2021 ◽  
Vol 13 (3) ◽  
pp. 1502
Author(s):  
Maria Xanthopoulou ◽  
Dimitrios Giliopoulos ◽  
Nikolaos Tzollas ◽  
Konstantinos S. Triantafyllidis ◽  
Margaritis Kostoglou ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Removal Rate ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Equilibrium Studies ◽  
Maximum Sorption Capacity ◽  
Algae Blooms ◽  
Maximum Sorption ◽  
Phosphate Anions ◽  
Adsorbent Dose

In water and wastewater, phosphate anions are considered critical contaminants because they cause algae blooms and eutrophication. The present work aims at studying the removal of phosphate anions from aqueous solutions using silica particles functionalized with polyethylenimine. The parameters affecting the adsorption process such as pH, initial concentration, adsorbent dose, and the presence of competitive anions, such as carbonate, nitrate, sulfate and chromate ions, were studied. Equilibrium studies were carried out to determine their sorption capacity and the rate of phosphate ions uptake. The adsorption isotherm data fitted well with the Langmuir and Sips model. The maximum sorption capacity was 41.1 mg/g at pH 5, which decreased slightly at pH 7. The efficiency of phosphate removal adsorption increased at lower pH values and by increasing the adsorbent dose. The maximum phosphate removal was 80% for pH 5 and decreased to 75% for pH 6, to 73% for pH 7 and to 70% for pH 8, for initial phosphate concentration at about 1 mg/L and for a dose of adsorbent 100 mg/L. The removal rate was increased with the increase of the adsorbent dose. For example, for initial phosphate concentration of 4 mg/L the removal rate increased from 40% to 80% by increasing the dose from 0.1 to 2.0 g/L at pH 7. The competitive anions adversely affected phosphate removal. Though they were also found to be removed to a certain extent. Their co-removal provided an adsorbent which might be very useful for treating waters with low-level multiple contaminant occurrence in natural or engineered aquatic systems.

Use of bentonite to control the release of copper from contaminated soils

Soil Research ◽  
2007 ◽  
Vol 45 (8) ◽  
pp. 618 ◽  
Author(s):  
Wanting Ling ◽  
Qing Shen ◽  
Yanzheng Gao ◽  
Xiaohong Gu ◽  
Zhipeng Yang
Keyword(s):  
Heavy Metals ◽  
Sorption Capacity ◽  
Contaminated Soils ◽  
Montmorillonite Clay ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Wide Ph Range ◽  
Ph Dependent ◽  
Ph Range ◽  
Soil Ageing

A decrease in release and availability of heavy metals in soil has been of worldwide interest in recent years. Bentonite is a type of expandable montmorillonite clay, and has strong sorption for heavy metals. In this work, the control of amended bentonite on the release of copper (Cu2+) from spiked soils was investigated using a batch equilibrium technique. Sorption of Cu by bentonite was pH-dependent, and could be well described using the Langmiur model. Maximum sorption capacity of the bentonite used in this study was 5.4 mg/g, which was much greater than soils reported in the literature. The extent of Cu2+ release from spiked soils was correlated with slurry concentrations, pH, and soil ageing process. In all cases, the amendment of bentonite was observed to effectively decrease the release of Cu2+ from soils. The apparent aqueous concentrations of Cu2+ released from soils devoid of bentonite treatment were 113–1160% higher than those from the soils amended with bentonite. Moreover, the magnitude of Cu2+ release decreased with increasing amount of bentonite added to soils. The bentonite added was more effective in retaining Cu2+ in sorbents for aged contaminated soils. Such enhanced retention resulting from the presence of bentonite was observed within a wide pH range from 2.5 to 7.0. Bentonite, as one of the most abundant minerals in soils, is regarded to improve the soil overall quality. The results obtained from this work provide useful information on utilisation of bentonite to control the release of heavy metals from contaminated soils.

CuO nanorods: a potential and efficient adsorbent in water purification

RSC Advances ◽  
2014 ◽  
Vol 4 (76) ◽  
pp. 40580-40587 ◽  
Author(s):  
Prasanta Kumar Raul ◽  
Samarpita Senapati ◽  
Ashish K. Sahoo ◽  
Iohborlang M. Umlong ◽  
Rashmi R. Devi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Sorption Capacity ◽  
Water Purification ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Efficient Adsorbent ◽  
Cuo Nanorods

CuO nanorods can remove Pb(ii) from aqueous solution with a maximum sorption capacity of 3.31 mg g−1at 298 K.

scholarly journals Use of aminated hulls of sunflower seeds for the removal of anionic dyes from aqueous solutions

2019 ◽  
Vol 17 (3) ◽  
pp. 1211-1224 ◽  
Author(s):  
T. Jóźwiak ◽  
U. Filipkowska ◽  
S. Brym ◽  
L. Kopeć
Keyword(s):  
Sorption Capacity ◽  
Textile Industry ◽  
Sunflower Seed ◽  
Freundlich Isotherm ◽  
Sorption Kinetics ◽  
Reactive Black 5 ◽  
Anionic Dyes ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption

Abstract In this study, we analyzed the effectiveness of sorption of dyes popular in the textile industry (Reactive Black 5, Reactive Yellow 84, Acid Yellow 23, and Acid Red 18) on aminated and non-aminated seed hulls of common sunflower (Helianthus annuus L.). The scope of the study included: determination of the effect of pH on dye sorption effectiveness, sorption kinetics analyses (sorption equilibrium time, pseudo-first-order/pseudo-second-order model, intramolecular diffusion model), and determination of the maximum sorption capacity against dyes (Langmuir/Freundlich isotherm). The sorbent was subjected to the FTIR analysis. The sorption capacity of the aminated sunflower seed hulls against reactive dyes RB5 and RY84 accounted for 51.02 mg/g and 63.27 mg/g, respectively, and was higher by 1665% (17.6 times higher) and 1425% (15.3 times higher) compared to that of non-modified hulls. In the case of acidic dyes, Acid Yellow 23 and Acid Red 18, the sorption capacity of the aminated sunflower seed hulls reached 44.78 mg/g and 42.19 mg/g, respectively, and was higher by 1881% (19.8 times higher) and 2284% (23.8 times higher), respectively, compared to the non-modified hulls.

Adsorption of CuCl2 on Mg-Al HTlc: Effect of EDTA and Addition Sequences

2012 ◽  
Vol 573-574 ◽  
pp. 150-154
Author(s):  
Yun Bo Zang ◽  
Nai Ying Wu
Keyword(s):  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Contact Time ◽  
Room Temperature ◽  
Copper Ions ◽  
Sorption Process ◽  
Langmuir Model ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Pseudo Second Order

In this study, removal of copper ions from aqueous solutions by synthetic Mg-Al-HTlc was investigated as a function of contact time, EDTA and addition sequences at room temperature. It is found that HTlc could reduced copper ions concentration effectively. The kinetics closely fit pseudo-second order kinetics with necessary time 9 h to reach equilibrium. The sorption process followed langmuir model. The maximum sorption capacity calculated was found to be 39.4 mg/g. The presence of EDTA and addition sequences could affect sorption of Cu(II) onto HTlc.

Cucumis melo Rind as Biosorbent to Remove Fe(II) and Mn(II) from Synthetic Groundwater Solution

2013 ◽  
Vol 795 ◽  
pp. 266-271 ◽  
Author(s):  
Norzila Othman ◽  
Syazwani Mohd Asharuddin
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Metal Concentration ◽  
Sorption Capacity ◽  
Cucumis Melo ◽  
Carboxyl Groups ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Synthetic Groundwater ◽  
Effective Sorbent

Cucumis melo rind was evaluated as a new biosorbent for the removal of Fe (II) and Mn (II) from synthetic groundwater solution. The maximum sorption capacity of Fe (II) and Mn (II) was found to be 4.98 mg/g and 1.37 mg/g respectively. Sorption was most efficient at pH 7 and 6.5 for Fe (II) and Mn (II) respectively. The biosorption of both metals increased as the quantity of biosorbent increased. The increase in initial metal concentration was associated with steep increase in biosorption at lower concentrations and progressively reaching towards plateau at higher metal concentration. FTIR demonstrated that hydroxyl and carboxyl groups were involved in the biosorption of the metal ions. The study points to the potential of new use of Cucumis melo rind as an effective sorbent for the removal of Fe (II) and Mn (II) from aqueous solution.

scholarly journals THE INFLUENCE OF THE DEACETYLATION DEGREE OF CHITOSAN IN THE FORM OF FLAKES ON THE EFFECTIVENESS OF NITRATES V SORPTION FROM AQUEOUS SOLUTIONS

2018 ◽  
Vol XXIII ◽  
pp. 88-96
Author(s):  
Tomasz Jóźwiak ◽  
Urszula Filipkowska ◽  
Paula Bugajska ◽  
Małgorzata Kuczajowska-Zadrożna ◽  
Artur Mielcarek
Keyword(s):  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Process Time ◽  
Effect Of Ph ◽  
Maximum Sorption Capacity ◽  
Degree Of Deacetylation ◽  
Deacetylation Degree ◽  
Maximum Sorption ◽  
Sorption From Aqueous Solutions

The influence of the degree of deacetylation of chitosan from the range of DD = 75–90% on the effectiveness of sorption of nitrates from aqueous solutions was investigated. The scope of the research included: determining the effect of pH on the effectiveness of N-NO3 binding on chitosan sorbents and determining the sorption capacity of chitosan sorbents with different degrees of deacetylation after 5, 15, 30 and 60 minutes. The effectiveness of sorption of nitrates on chitosan sorbents increased in the series DD=75% < DD=85% < DD=90%. Regardless of the degree of deacetylation, the sorption effectiveness of nitrates on chitosan was the highest at pH 4. The amount of nitrate-related sorbents was the highest after 30 min of sorption. A process time which was too long resulted in desorption of nitrates. The maximum sorption capacity for chitosan with the degree of deacetylation DD = 75, 85 and 90% was 0.59 mg N-NO3/g, 0.60 mg N-NO3/g and 0.87 mg N-NO3/g, respectively.

Effect of magnetic nanoparticles containing ropivacaine on ankle nerve block in rats

2021 ◽  
Vol 11 (9) ◽  
pp. 1483-1490
Author(s):  
Ronghua Li ◽  
Yongbo Li ◽  
Xiucai Hu ◽  
Shiqiang Shan ◽  
Lingling Liu ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Pain Management ◽  
Management Strategy ◽  
Magnetic Iron Oxide ◽  
Pain Stimulation ◽  
The Central Nervous System ◽  
Clinical Anesthesia ◽  
The Stability ◽  
Pain Management Strategy

Ropivacaine (RVC), a common pain management drug used for clinical anesthesia and postoperative analgesia, inhibits peripheral nociceptive pain stimulation. However, the potential neurological damage resulting from RVC use must be considered. Developing a strategy to enhance the local anesthetic effect of RVC while reducing its potential acute toxicity to the central nervous system is urgently needed. In this study, a novel RVC nanocomposite drug, magnetic iron oxide/polyethylene glycol-carboxymethyl chitosan/ropivacaine nanoparticle (mCMCS-PEG/RVC NPs), was synthesized with magnetic iron oxide. The inherent shell–core structure of mCMCS-PEG retained core magnetic properties, improved the stability and biocompatibility of magnetic nanoparticles, and avoided excessive degradation. Thus, mCMCS-PEG/RVC NPs are expected to provide a new pain management strategy for perioperative patients.

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