scholarly journals Data on the fabrication of hybrid calix [4]arene-modified natural bentonite clay for efficient selective removal of toxic metals from wastewater at room temperature

Data in Brief ◽  
2021 ◽  
Vol 35 ◽  
pp. 106799
Author(s):  
Khouloud Jlassi ◽  
Kamel Eid ◽  
Mostafa H. Sliem ◽  
Aboubakr M. Abdullah ◽  
Mohamed M. Chehimi
Keyword(s):  
Toxic Metals ◽  
Room Temperature ◽  
Bentonite Clay ◽  
Selective Removal

scholarly journals The removal of turbidity and toxic metals in the AMD using a combination of saw dust, bentonite clay and synthetic CaMg.2(OH)2

2021 ◽  
Author(s):  
I. O. Ntwampe
Keyword(s):  
Toxic Metals ◽  
Mine Drainage ◽  
Bentonite Clay ◽  
Lower Percentage ◽  
Turbidity Removal ◽  
Saw Dust ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Sem Micrograph ◽  
Oxygen Oxidation

Abstract Sets of experiments were conducted using 200 mL of synthetic acid mine drainage(AMD) into five 500 mL glass beaker, dosed with varying quantities of bentonite clay, saw dust and CaMg.2(OH)2 respectively and as a flocculent (bentonite clay, saw dust and CaMg.2(OH)2), mixed at 250 and 100 rpm for 2 and 10 mns respectively. The samples settled for 1 hour after which the pH, conductivity, turbidity, dissolved oxygen, oxidation reduction potential and toxic metals were measured. The turbidity removal of treated AMD samples treated with a flocculent (0–23 NTU) is lower compared to that of the samples treated with bentonite clay and saw dust (27–32 NTU). Results show 100% removal of Ni, moderate percentage removal of Fe and slightly lower percentage of Cu in treated AMD using a flocculent. Turbidity removal in treated AMD using a flocculent is higher compared to that of the samples treated with bentonite clay, saw dust or CaMg.2(OH)2. Treated AMD using flocculent has low Ca, Mg, Cl− and SO42− content (>84.8%). The SEM micrograph of the sludge of the sample with a combination of 1.5 bentonite clay, 1.5 g saw dust and 20 mL 0.025 M CaMg.2(OH)2 dosage shows optimal sorption of turbid materials.

scholarly journals Treatment of AMD using a combination of saw dust, bentonite clay and phosphate in the removal of turbid materials and toxic metals

2021 ◽  
Author(s):  
I. O. Ntwampe
Keyword(s):  
South Africa ◽  
Particle Size ◽  
Removal Efficiency ◽  
Toxic Metals ◽  
Laboratory Experiments ◽  
Mine Drainage ◽  
Bentonite Clay ◽  
Small Scale ◽  
Saw Dust ◽  
Natural Organic Compounds

Abstract Acid mine drainage collected from the western decant in South Africa was treated in a series of small-scale laboratory experiments. 200 mL of the sample was poured into five 500 mL glass beakers using flocculants formed by mixing size-optimized 1.5 g of bentonite clay with 3.5 g saw dust and 1.0 g of Na3PO4 in triplicates (experiment A). Four similar sets of control experiments were conducted using the same amount of bentonite clay and saw dust with varying Na3PO4, contents in AMD treatment; the rationale being to determine the efficiency of Na3PO4 (experiments B, C and D). The results show that conductivity has an influence in the removal of the turbid materials. The removal efficiency of toxic metals using a flocculant containing 220 μm bentonite clay particle size and 0.012 or 0.25 M of Na3PO4 is higher than 96% when compared to that of the samples dosed with a flocculant containing 0.05 M Na3PO4, which is less than 91%. The flocculent also showed optimal removal efficiency of both turbid materials and toxic metals, i.e. removal efficiency within a range 96.5–99.3%. The flocculants containing 0.025 M Na3PO4 showed optimal removal efficiency of turbidity, colour, toxic metals and natural organic compounds.

scholarly journals Bentonite Clay K-10 as an Efficient Reagent for the Synthesis of Quinoxaline Derivatives at Room Temperature

2009 ◽  
Vol 6 (s1) ◽  
pp. S247-S253 ◽  
Author(s):  
Alireza Hasaninejad ◽  
Abdolkarim Zare ◽  
Mohsen Shekouhy ◽  
Ahmad Reza Moosavi-Zare
Keyword(s):  
Ethyl Alcohol ◽  
Room Temperature ◽  
Reaction Times ◽  
Bentonite Clay ◽  
Quinoxaline Derivatives ◽  
Efficient Reagent

Bentonite clay K-10 acts as an efficient reagent for the preparation of quinoxaline derivatives via the condensation of aryl and alkyl 1,2-diamines with α-diketones in ethyl alcohol as a green media at room temperature. Using this method, the title compounds are produced in high to excellent yields and short reaction times.

Über 5-Hydroxymethyl-cytidin und 5-Hydroxymethyl-cytosin-N-3-β-D-glucopyranosid sowie über reaktionsfähige Vorstufen

1966 ◽  
Vol 21 (10) ◽  
pp. 942-952 ◽  
Author(s):  
Reinhard Brossmer ◽  
Erich Röhm
Keyword(s):  
Hydrochloric Acid ◽  
Benzyl Alcohol ◽  
Catalytic Hydrogenation ◽  
Sodium Methoxide ◽  
Room Temperature ◽  
Selective Removal ◽  
Protecting Groups ◽  
Hydroxymethyl Cytosine ◽  
Analogous Manner ◽  
Synthetic Intermediates

5-Benzyloxymethyl-NNH2-benzoyl-cytosine (4) is formed from 5-hydroxymethyl-cytosine (1) in 80% yield by benzylation and subsequent benzoylation. The benzylation readily takes place with benzyl alcohol and catalytic amounts of hydrochloric acid in tetrahydrothiophen-1.1-dioxide as solvent. — 4 is quantitatively converted in pyridine at room temperature to a toluene soluble mercury (II) salt 5.5 condenses easily with 2.3.5-tribenzoyl-D-ribofuranosyl chloride to give the β-nucleoside 6, no a-anomer being found. — The removal of all protecting groups by catalytic hydrogenation and treatment with sodium methoxide or ammonia leads to cristalline 5-hydroxymethyl cytidine 10 (ca. 60% yields based on 1). — In an analogous manner N-3-β-D-glucosyl-5-hydroxymethyl-cytosine 15 is prepared. — Selective removal of certain of the protecting groups in 6 and 11 yields potentially valuable synthetic intermediates.

scholarly journals Selective Removal of As(V) Ions from Acid Mine Drainage Using Polymer Inclusion Membranes

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 909
Author(s):  
Iwona Zawierucha ◽  
Anna Nowik-Zajac ◽  
Grzegorz Malina
Keyword(s):  
Acid Mine Drainage ◽  
Toxic Metals ◽  
Arsenic Removal ◽  
Mine Drainage ◽  
Environmental Pollutants ◽  
Sulfuric Acid Concentration ◽  
Toxic Metal ◽  
Cellulose Triacetate ◽  
Selective Removal ◽  
Acid Mine

Acid mine drainage (AMD) is globally recognized as one of the environmental pollutants of the priority concern due to high concentrations of toxic metals and sulfates. More rigorous environmental legislation requires exploitation of effective technologies to remove toxic metals from contaminated streams. In view of high selectivity, effectiveness, durability, and low energy demands, the separation of toxic metal ions using immobilized membranes with admixed extractants could ameliorate water quality. Cellulose triacetate based polymer inclusion membranes (PIMs), with extractant and plasticizer, were studied for their ability to transport of As(V) ions from synthetic aqueous leachates. The effects of the type and concentration of extractant, plasticizer content, and sulfuric acid concentration in source phase on the arsenic removal efficiency have been assessed. Under the best of applied conditions, PIM with Cyanex 921 as extractant and o-nitrophenyl octyl ether (o-NPOE) as plasticizer showed high repeatability and excellent transport activity for selective removal of As(V) from AMD.

scholarly journals Controlled aggregation of core(amorphous silica)@shell(TPA+-polysilicate) nanoparticles at room temperature by selective removal of TPA+ ions from the nanoparticle shell

2019 ◽  
Vol 6 (7) ◽  
pp. 1639-1653 ◽  
Author(s):  
Sanja Bosnar ◽  
Maja Dutour Sikirić ◽  
Vilko Smrečki ◽  
Josip Bronić ◽  
Suzana Šegota ◽  
...  
Keyword(s):  
Amorphous Silica ◽  
Room Temperature ◽  
Silica Shell ◽  
Selective Removal ◽  
Silanol Groups

Displacement of TPA+ ions from the nanoparticle shell exposes the terminal silanol groups, which enables the aggregation of the collided nanoparticles.

Vulcanization, Mechanical and Dielectric Properties of Carbon Black/Nanoclay Reinforced Natural Rubber Hybrid Composites

2015 ◽  
Vol 766-767 ◽  
pp. 377-382 ◽  
Author(s):  
K. Ravikumar ◽  
K. Palanivelu ◽  
K. Ravichandran
Keyword(s):  
Dielectric Properties ◽  
Carbon Black ◽  
Natural Rubber ◽  
Room Temperature ◽  
Hybrid Composites ◽  
Bentonite Clay ◽  
Volume Resistivity ◽  
Hybrid Fillers ◽  
Organically Modified ◽  
Octadecyl Amine

In this present work the effect of reinforcement of hybrid fillers such as nanoclay and carbon black in natural rubber were studied. Sodium bentonite clay was organically modified with octadecyl amine using cation exchange reaction and characterized by FTIR, XRD and SEM. The organomodified clay with 5 phr loading and also with carbon black (CB) of 25 phr loading were incorporated into natural rubber by using a two-roll mixing mill. Vulcanization, mechanical and dielectric properties were studied. Vulcanization and mechanical properties of natural rubber increases on addition of organomodified clay and also with combination of clay and carbon black compared to unmodified clay and gum compounds. Dielectric properties such dielectric constant, dielectric loss and volume resistivity were studied at room temperature and found improved results of the combination of modified clay/CB filled hybrid composites.

Triethylamine-methanol mediated selective removal of oxophenylacetyl ester in saccharides

2021 ◽  
Author(s):  
Javeed Ur Rasool ◽  
Atul Kumar ◽  
Asif Ali ◽  
Qazi Naveed Ahmed
Keyword(s):  
Efficient Method ◽  
Room Temperature ◽  
Selective Removal

A highly selective, mild, and efficient method for the cleavage of oxophenylacetyl ester protected saccharides was developed using triethylamine in methanol at room temperature.

scholarly journals SELECTIVE REMOVAL OF TOXIC METALS FROM WASTE WATER USING p-CRESOL, DITHIOOXAMIDE AND FORMALDEHYDE (p-CDF)

2014 ◽  
Author(s):  
S. S. Katkamwar S. B. Kapoor P. M. Telkhade S. S. Katkamwar S. B. Kapoor P. M. Telkhade ◽  
Keyword(s):  
Waste Water ◽  
Toxic Metals ◽  
Selective Removal

scholarly journals Influence of Bentonite Nanoparticles on Properties of PVP-CMC-Gums Biodegradable Hydrogel Films for Biomedical Applications

2021 ◽  
Author(s):  
Samahir Sheikh Idris ◽  
ozgun yucel
Keyword(s):  
Biomedical Applications ◽  
Room Temperature ◽  
Contact Lenses ◽  
Bentonite Clay ◽  
Surface Hydrophobicity ◽  
Swelling Properties ◽  
Wide Range ◽  
Biodegradable Hydrogel ◽  
The Many ◽  
Hydrogel Films

Abstract Using polymer daily becomes increasingly extensive; the many characteristics of hydrogel lead to a wide range of uses, particularly in biomedical applications. Hydrogel films were made from a variety of materials in this investigation. Casting techniques and room temperature drying were used to make PVP- CMC- Gums films based on hydrogels, however, the effects of adding bentonite clay were needed. SEM, FTIR, XRD, TGA, swelling, solubility, contact angle, and a variety of other studies were used to illustrate and analyze a variety of physical, mechanical, thermal, and many characteristics. The major findings revealed new peaks, which indicate the creation of cross-linking bonds, which are the primary cause of capsulation and release characteristics, indicating that these films might be utilized in drug delivery and a variety of other applications. The PCXB film has the best color, surface hydrophobicity, solubility, and swelling properties, while the PCGB film has the greatest biodegradability and permeability results, and both films have strong thermal, mechanical, and releasing properties. As a result, adding bentonite clay to hydrogel films improves all of their characteristics, making them suitable for a variety of biomedical applications such as dentistry root filling, tissue engineering, contact lenses, and bandages.

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