Two novel mixed Eu3+/Y3+ Ln MOFs: influence of pH on the topology, Eu/Y ratio and energy transfer

CrystEngComm ◽  
2014 ◽  
Vol 16 (25) ◽  
pp. 5681-5688 ◽  
Author(s):  
Yu Zhang ◽  
Weiwei Ju ◽  
Xiao Xu ◽  
Yun Lv ◽  
Dunru Zhu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Ph Value ◽  
Ph Values ◽  
Influence Of Ph

Two mixed europium–yttrium MOFs with different interesting structures and doping proportions have been successfully synthesized by adjusting the pH values. The pH value largely affects the topologies and Eu/Y ratios of the two compounds.

scholarly journals The Influence of pH Values on the Crystallite Size of ZnO by Solvothermal Synthesis

2017 ◽  
Vol 2 (2) ◽  
pp. 118 ◽  
Author(s):  
Ahmadi Jaya Permana ◽  
Dian Wulandari ◽  
Hartati Hartati ◽  
Harsasi Setyawati ◽  
Mochammad Zakki Fahmi
Keyword(s):  
Heat Treatment ◽  
Zinc Oxide ◽  
Crystallite Size ◽  
Solvothermal Synthesis ◽  
Solvothermal Method ◽  
Ph Value ◽  
Semiconductor Material ◽  
X Ray ◽  
Ph Values ◽  
Influence Of Ph

 Zinc oxide (ZnO) is a semiconductor material that widely used in various applications due to its unique properties. Synthesis of ZnO by solvothermal method has been conducted with controlled pH values. The variations of pH value were 10, 11 and 12 by adjusting NaOH content. Crystall structure of the synthesis products after heat treatment at 110oC and 600oC has characterised by X-ray Diffratometer (XRD). Crystallite size of ZnO was measured by Scherrer equation. Crystall phase of ZnO has been observed on all pH value variations at 110 oC with 22,98-37,06 nm of crystallite size, whereas ZnO has been observed on all pH value variations at 600 oC with 41,39-71,77 nm of crystallite size.Keywords: ZnO, pH values, crystallite size, solvothermal

Influence of pH on the Morphology and Luminescence Properties of Europium-Doped Hydroxyapatite Nanoparticles

2011 ◽  
Vol 391-392 ◽  
pp. 1132-1137
Author(s):  
Su Ping Huang ◽  
Jun Zhu ◽  
Ke Chao Zhou
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Doping Concentration ◽  
Ph Value ◽  
Luminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inductively Coupled ◽  
Ph Values ◽  
Influence Of Ph

Luminescence behaviors and morphology of Eu3+doped hydroxyapatite synthesized under different pH values were well investigated by X-ray diffraction (XRD), scanning electronic microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Inductively Coupled Plasma (ICP) (ICP–PLASMA 1000), and photoluminescence (PL) spectroscopy. Results revealed that With pH values increased from 6.5 to 10.0, the morphology of nano-Eu:HA particles changes from rod particles to equiaxed particles. The actual doping concentration and aspect ratio of Eu3+-doped HA decreased with the increasing of pH value. At the same time, the fluorescence intensity also tends to weakly lower with the increasing of pH value, which indicated that the luminescence properties mainly depended on the actual Eu3+doping concentration, the influences of morphology on the luminescence properties were slight.

scholarly journals Influence of pH and ionic strength on the aggregation behaviors of xylan rich hemicelluloses with alkaline lignins

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 7608-7622
Author(s):  
Guichun Hu ◽  
Jinguang Hu ◽  
Honglei Chen ◽  
Shunxi Song ◽  
Fuqiang Chu
Keyword(s):  
Particle Size ◽  
Self Assembly ◽  
Main Chain ◽  
Ph Value ◽  
Low Ph ◽  
Ph Values ◽  
Wide Range ◽  
Nacl Concentration ◽  
Aggregation Behaviors ◽  
Influence Of Ph

The evolution of xylan-rich hemicelluloses (XH) aggregation behaviors in the presence of alkaline lignins (AL) under a wide range of pH values and NaCl concentration were investigated via dynamic light scattering and turbidity measurements. XH isolated from wheat straw contain a xylose backbone with arabinose side chains and a small amount of phenol groups. XH tend to aggregate in solution due to their low ratio of arabinose to xylose and hydrophobic phenol groups. AL interact with XH through the phenol groups bonded to the hemicellulose main chain to form an AL-XH complex. As the pH value decreases, the particle size and turbidity of AL, XH and their bonded complex all increase. The size of the AL-XH complex agglomerate is greater than the size of a XH at the same pH value, which indicates that the self-assembly of lignin molecules initiate the aggregation of XH. The particle size and turbidity of XH and AL-XH complexes increase as the XH concentration increase. At low pH values, e.g., 6.0, the particle size of the AL-XH complex more obviously increases compared to the XH particles. The size and turbidity of the AL, XH, and AL-XH complex agglomerates increased as the NaCl concentration increased.

Influence of pH on the Morphology of Yttrium Oxide Hydroxide Nitrate Nanocrystal

2007 ◽  
Vol 336-338 ◽  
pp. 2176-2178 ◽  
Author(s):  
Zhang Lian Hong ◽  
Huang Guo ◽  
Li Xia Peng ◽  
Min Quan Wang
Keyword(s):  
Hydrothermal Method ◽  
Yttrium Oxide ◽  
Ph Value ◽  
High Ph ◽  
Ph Values ◽  
Starting Solution ◽  
Primary Mechanism ◽  
Oxide Hydroxide ◽  
Influence Of Ph

Yttrium oxide hydroxide nitrate (Y4O(OH)9NO3), which was prepared by polyvinyl alcoholassisted hydrothermal method from the Y(NO3)3 and KOH starting solution, was characterized by XRD and FE-SEM. The results revealed that pH value of the starting solution is an important factor which determines the morphology and size of the products. The obtained products varied from lamina microprisms to circular nanorods when the pH value increased from 7.0 to 8.0. In the high pH value above 8.0, the size of nanorods decreased with increasing pH value. A primary mechanism was proposed to explain the evolution of morphology and size of Y4O(OH)9NO3 products prepared under various pH values.

Nitrate and Phosphate Removal by Co-immobilized Chlorella pyrenoidosa and Activated Sludge at Different pH Values

2003 ◽  
Vol 38 (3) ◽  
pp. 541-551 ◽  
Author(s):  
Guolan Huang ◽  
Yuan Wang
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Ph Value ◽  
Nitrate Removal ◽  
Chlorella Pyrenoidosa ◽  
Phosphate Removal ◽  
Ph Values ◽  
Pva Gel ◽  
Influence Of Ph ◽  
Immobilization Method

Abstract A new immobilization method, the simplifying modified polyvinyl alcohol (PVA)-sulfate method, has been evaluated. The influence of pH value on nitrate and phosphate removal by co-immobilized Chlorella pyrenoidosa and activated sludge was studied. The results showed that the co-immobilized system was adaptable to the environment; the micro-algae reproduced rapidly inside a PVA gel carrier under pH ranging from 5.0 to 10.0. Phosphate removal efficiency of the co-immobilized system was distinctly affected by pH but nitrate removal efficiency was not affected very much. The co-immobilized system had a higher removal efficiency in the water when close to neutral. Under suitable circumstances, the removal efficiency of nitrate reached 80% in all four experimental periods; meanwhile, the highest removal efficiency of phosphate was 88% but decreased to 56% from the first period to the fourth period in the experiment.

scholarly journals Study on synthesizing Mg/Al layered double hydroxides at different pHs

2014 ◽  
Vol 15 ◽  
pp. 36-39 ◽  
Author(s):  
E Otgonjargal ◽  
G Burmaa ◽  
B Enkhmaa ◽  
M Enkhtuul ◽  
L Nyam-Ochir ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Ph Value ◽  
Infrared Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ph Values ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Influence Of Ph ◽  
Scanning Electron

Mg/Al layered double hydroxide (LDH) was successfully synthesized at different pHs values. The Mg/AL LDH was well characterized by X-Ray diffraction and Fourier transform infrared analysis. The morphology of the LDH was observed using Scanning electron microscopy with energy dispersive X-ray spectroscopy. The influence of pH values on the morphology of the Mg/Al LDHs were studied. The result showed that the well-synthesized Mg/Al LDHs could be obtained when the pH value was about 10.0 at room temperature.DOI: http://doi.dx.org/10.5564/mjc.v15i0.319 Mongolian Journal of Chemistry 15 (41), 2014, p36-39

Swelling Behavior of Poly(Acrylamide) Nanoclay Composite Hydrogels

2008 ◽  
Vol 47-50 ◽  
pp. 230-233
Author(s):  
Peng Li ◽  
Siddaramaiah ◽  
Ok Kyung Park ◽  
Nam Hoon Kim ◽  
Seok Bong Heo ◽  
...  
Keyword(s):  
Saline Solution ◽  
In Situ Polymerization ◽  
Ph Value ◽  
Water Absorbency ◽  
Ph Values ◽  
Swelling Capacity ◽  
Influence Of Ph ◽  
Swelling Behaviors ◽  
Poly Acrylamide

A series of nanocomposite (NC) hydrogels were synthesized by in-situ polymerization of acrylamide (AAm) monomer using laponite XLS clay as a crosslinker. This paper focused on water absorbency of the NC hydrogels with various clay contents, at various pH values and ionic strengths. The influence of pH value on swelling behaviors showed that a maximum swelling ratio was observed at pH 11. The swelling abilities of the NC composites decreased in saline solution strength. Heat treatment of NC hydrogels improved the swelling capacity of the hydrogels.

The Influence of Ph Value on the Treatment of Direct Sun-Proof Dyes Wastewater by Iron Trichloride

2013 ◽  
Vol 690-693 ◽  
pp. 1113-1116
Author(s):  
Yu Ping Tian ◽  
Bo Wang
Keyword(s):  
Ph Value ◽  
Removal Rate ◽  
Great Difficulty ◽  
Dyeing Wastewater ◽  
Color Intensity ◽  
Ph Values ◽  
Optimum Ph ◽  
Iron Trichloride ◽  
Influence Of Ph ◽  
Light Green

The treatment of dyeing wastewater is a problem of great difficulty and a focus of public owing to its high color intensity, varying water quality and poor biodegradability. The optimal pH values of iron trichloride in treating three kinds of direct sun-proof dyeing wastewater were studied. Experimental results show when the concentration of iron trichloride was 2g/L, the optimum pH value were 8,6 and 7 for three kinds of simulated dye wastewater of direct sun-proof light green, yellow and scarlet.Under these conditions, the removal rate of turbidity were 88.7%, 89.5% and 92.9%, and the removal rate of color were 83.6%, 62.3% and 79.6%.

scholarly journals Influence of pH value on sulfonamide ozonation using caffeine as a contamination indicator

2019 ◽  
Vol 20 (2) ◽  
pp. 508-515
Author(s):  
Glenda Araujo S. Gireli ◽  
Milena Guedes Maniero ◽  
José Roberto Guimarães
Keyword(s):  
Surface Water ◽  
Ph Value ◽  
Tap Water ◽  
Degradation Efficiency ◽  
Ultrapure Water ◽  
Ph Values ◽  
Ozone Dose ◽  
Aqueous Matrices ◽  
The One ◽  
Influence Of Ph

Abstract Ozonation was effective in degrading six sulfonamides: sulfaquinoxaline, sulfamethazine, sulfamethoxazole, sulfathiazole, sulfadimethoxine, and sulfadiazine (C0 = 100 μg L−1). The degradation experiments were based on two variables: pH (3.0, 7.0 and 11.0) and aqueous matrix (ultrapure water, tap water, and surface water). In all matrices studied and pH 11.0, more than 99% of the drugs were degraded with the highest applied ozone dose (65 mg L−1), when compared with other pH values. Also, comparing the three aqueous matrices, the ultrapure water was the one that required the lowest ozone dosage (6.4 mg L−1) to reach the same degradation efficiency of the sulfonamides. Caffeine is known as an environment contamination indicator. Therefore, this does not intend to totally remove this compound, but to verify its degradation level compared with the sulfonamides.

Influence of pH Value on the Performance of Composite Films Prepared from Chromium Residue by Hydrothermal Method

2013 ◽  
Vol 28 (4) ◽  
pp. 387-392
Author(s):  
Tong SUN ◽  
Lian-Li LIU ◽  
Shu-Ying XU ◽  
Xiao-Lin PENG ◽  
Hai-Long YANG
Keyword(s):  
Hydrothermal Method ◽  
Ph Value ◽  
Composite Films ◽  
Influence Of Ph
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