Uniform and monodisperse polysilsesquioxane hollow spheres: synthesis from aqueous solution and use in pollutant removal

2011 ◽  
Vol 21 (29) ◽  
pp. 10744 ◽  
Author(s):  
Fuping Dong ◽  
Wanping Guo ◽  
Sung-Soo Park ◽  
Chang-Sik Ha
Keyword(s):  
Aqueous Solution ◽  
Hollow Spheres ◽  
Pollutant Removal

scholarly journals Selenium in wastewater can be adsorbed by modified natural zeolite and reused in vegetable growth

2021 ◽  
Vol 104 (2) ◽  
pp. 003685042110198
Author(s):  
Xiao Zhang ◽  
Xinyuan Li ◽  
Zihao Jin ◽  
Sadam Hussain Tumrani ◽  
Xiaodong Ji
Keyword(s):  
Aqueous Solution ◽  
Ph Value ◽  
Soil Improvement ◽  
Pollutant Removal ◽  
Maximum Adsorption Capacity ◽  
Selenium Content ◽  
Water Release ◽  
Soil Release ◽  
Release Ratio ◽  
Water Pollutant

Modified natural zeolites (MNZ) are widely used in pollutant removal, but how to address these MNZ that have adsorbed pollutants must be considered. Selenium is an essential trace element for metabolism and is also a water pollutant. Selenium is adsorbed in the water by MNZ in this study first. Then the Brassica chinensis L. was planted in the soil which contains the MNZ loaded with selenium (MNZ-Se) to explore selenium uptake. MNZ-Se release tests in water and soil were also considered. The results showed the following: (1) The maximum adsorption capacity of MNZ for selenium is 46.90 mg/g. (2) Water release experiments of MNZ-Se showed that regardless of how the pH of the aqueous solution changes, the trend of the release of selenium from MNZ-Se in aqueous solution is not affected and first decreases before stabilizing. (3) Soil release experiments of MNZ-Se showed that the selenium content in the soil increased and reached the concentration in the standard of selenium-rich soil. Addition amount and soil pH value will affect the release ratio. The release ratio of MNZ-Se in the water was higher than that in the soil. (4) With an increase in the soil MNZ-Se content, the selenium content in the soil and B. c increases. Above all, MZN can be a good medium for water pollutant removal and soil improvement.

scholarly journals Removal of Aromatic Chlorinated Pesticides from Aqueous Solution Using β-Cyclodextrin Polymers Decorated with Fe3O4 Nanoparticles

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1038 ◽  
Author(s):  
Sebastián Salazar ◽  
Daniel Guerra ◽  
Nicolás Yutronic ◽  
Paul Jara
Keyword(s):  
Aqueous Solution ◽  
Pollutant Removal ◽  
Proton Nuclear Magnetic Resonance ◽  
Aquatic Environments ◽  
Chlorinated Pesticides ◽  
Magnetization Saturation ◽  
Chlorophenoxyacetic Acid ◽  
Cyclodextrin Polymers ◽  
Improved Technology ◽  
Granulated Activated Carbon

This article describes the sorption properties of cyclodextrin polymers (nanosponges; NS) with the pesticides 4-chlorophenoxyacetic acid (4-CPA) and 2,3,4,6-tetrachlorophenol (TCF), including an evaluation of its efficiency and a comparison with other materials, such as granulated activated carbon (GAC). NS-pesticide complexes were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray powder diffraction (XRPD), proton nuclear magnetic resonance (1H-NMR), UV–VIS, and thermogravimetric analysis (TGA). This confirms the interactions of the guests with nanosponges and shows that the polymers have favorable sorption capacities for chlorinated aromatic guests. Our studies also show that the inclusion complex is predominantly favored for NS/CPA rather than those formed between TCF and NS due to the size of the adsorbate and steric effects. Sorption studies carried with repeated cycles demonstrate that NS polymers could be an improved technology for pollutant removal from aquatic environments, as they are very efficient and reusable materials. Our experiments and characterization by SEM, EDS, UV–VIS, and magnetization saturation (VSM) also show that NS is an optimal substrate for the deposition of magnetite nanoparticles, thus improving the usefulness and properties of the polymer, as the nanosponges could be retrieved from aqueous solution with a neodymium magnet without losing its efficiency as a pesticide sorbent.

scholarly journals Acetone fractionation: a simple and efficient method to improve the performance of lignin for dye pollutant removal

RSC Advances ◽  
2019 ◽  
Vol 9 (61) ◽  
pp. 35895-35903
Author(s):  
Hao Li ◽  
Ze Yuan ◽  
Yuyu Xing ◽  
Jiarong Li ◽  
Jing Fang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Adsorption Capacity ◽  
Efficient Method ◽  
Pollutant Removal ◽  
Cationic Dye ◽  
Acetone Fractionation

In this work, it was found that the adsorption capacity of lignin to cationic dye (methylene blue, MB) from aqueous solution could be significantly improved by simple acetone fractionation.

scholarly journals Facile Synthesis and Photocatalytic Property of Titania/Carbon Composite Hollow Microspheres with Bimodal Mesoporous Shells

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Guohong Wang ◽  
Bei Cheng ◽  
Jun Zhang ◽  
Lin Xu ◽  
Tingting Yin
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Hollow Spheres ◽  
Photocatalytic Property ◽  
Nitrogen Adsorption ◽  
Carbon Composite ◽  
Hollow Microspheres ◽  
Calcination Time ◽  
One Pot ◽  
Pore Structures

Titania/carbon composite hollow microspheres with bimodal mesoporous shells are one-pot fabricated by hydrothermal treatment of the acidic (NH4)2TiF6aqueous solution in the presence of glucose at180∘C for 24 h and then calcined at450∘C. The as-prepared samples were characterized by XRD, SEM, TEM, HRTEM, UV-visible spectroscopy, and nitrogen adsorption-desorption isotherms. The photocatalytic activity of the as-prepared samples was evaluated by daylight-induced photocatalytic decolorization of methyl orange aqueous solution at ambient temperature. The effects of calcination time on the morphology, phase structure, crystallite size, specific surface area, pore structures, and photocatalytic activity of the microspheres were investigated. The results indicated that the as-obtained TiO2/C composite hollow spheres generally exhibit bimodal mesopore size distribution with their peak intra-aggregated mesopore size in the range of 2.3–4.5 nm and peak interaggregated mesopore size in the range of 5.7–12.7 nm, depending on specific calcination time. The daylight-induced photoactivity of as-obtained hollow TiO2/C microspheres generally exceeds that of Degussa P25. The influences of calcination time on the photoactivity are discussed in terms of carbon content, phase structures, and pore structures.

Monoaromatic Pollutant Removal by Carbon Nanotubes from Aqueous Solution

2012 ◽  
Vol 488-489 ◽  
pp. 934-939 ◽  
Author(s):  
Hamidreza Pourzamani ◽  
Bijan Bina ◽  
Mohammad Mehdi Amin ◽  
Alimorad Rashidi
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Water Solubility ◽  
Pollutant Removal ◽  
Water And Wastewater Treatment ◽  
Potential Applications ◽  
Good Potential ◽  
Equilibrium Amount ◽  
Water And Wastewater ◽  
Best Fit

The removal of monoaromatic (benzene (B) and toluene (T)) from aqueous solution by multi walled, single walled, and hybrid carbon nanotubes (MWCNTs, SWCNTs, and HCNTs) was evaluated for a nanomaterial dose of 1 g/l, concentration of 10-100 mg/l, and pH 7. The equilibrium amount removed by SWCNTs (B: 9.98 mg/g and T: 9.96 mg/g) was higher than for MWCNTs and HCNTs. Toluene has a higher adsorption tendency on CNTs than benzene, which is related to the increasing water solubility and the decreasing molecular weight of the compounds. The SWCNTs performed better for B and T sorption than the MWCNTs and HCNTs. Isotherms study based on isofit program, indicate that the Generalized Langmuir-Freundlich (GLF) isotherm expression provides the best fit for benzene sorption and Brunauer-Emmett-Teller (BET) isotherm is the best fit for toluene adsorption by SWCNT. SWCNTs are efficient B and T adsorbents and possess good potential applications to water and wastewater treatment and maintain water of high quality that could be used for cleaning up environmental pollution.

Application of Thermally Treated Water Treatment Sludge as a Remarkable Adsorbent Towards Emerging Pollutant Removal from Aqueous Solution

2021 ◽  
Vol 232 (10) ◽  
Author(s):  
Patrícia Grassi ◽  
Edson Luiz Foletto ◽  
Guilherme Luiz Dotto ◽  
Dison Stracke Pfingsten Franco ◽  
Sérgio Luiz Jahn
Keyword(s):  
Aqueous Solution ◽  
Water Treatment ◽  
Pollutant Removal ◽  
Water Treatment Sludge ◽  
Treated Water ◽  
Emerging Pollutant ◽  
Thermally Treated

scholarly journals Photocatalytic Nanocomposite Polymer-TiO2 Membranes for Pollutant Removal from Wastewater

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 402
Author(s):  
Khelil Bouziane Errahmani ◽  
Ouassila Benhabiles ◽  
Sohbi Bellebia ◽  
Zohra Bengharez ◽  
Mattheus Goosen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Pollutant Removal ◽  
Operating Conditions ◽  
Pollutant Concentration ◽  
Crossflow Filtration ◽  
Antifouling Activity ◽  
Nanocomposite Polymer ◽  
Dope Solution ◽  
The Impact ◽  
Sem Morphology

Photocatalytic TiO2-PVDF/PMMA nano-composites flat sheet membranes were fabricated by phase inversion and then employed in a crossflow filtration pilot to remove model pollutants of various sizes and charge from aqueous solution. The dope solution contained a mixture of PVDF and PMMA as polymers, polyethylene glycol (PEG) and polyvinylpyrrolidone (PVP) as additives, triethyl phosphate (TEP) as green solvent and TiO2 as immobilized photo catalyst. After undergoing characterization tests such as SEM morphology thickness, porosity, contact angle and water permeability, the membranes were used to eliminate the model pollutants from synthetic aqueous solution. The impact of the operating conditions (i.e., pH, pressure and initial pollutant concentration) and composition of the doping solution on the performance and photocatalytic and antifouling activity of the membranes was investigated. The results showed that Congo Red and Tartrazine despite their small size were rejected at 99% and 81%, respectively, because of their negative charge, while Ciprofloxacin, which is larger than Tartrazine but of neutral charge, crossed the membrane. The permeability did not decrease with a decline in pollutant concentration but diminished when the pressure increased and was reduced by more than half for wastewater.

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