scholarly journals Surface modification of nano-TiO2 with lanthanide-acetylacetonate complexes

2022 ◽  
Vol 5 (1) ◽  
pp. 1
Author(s):  
Pengfei Li ◽  
Fugen Yuan
Keyword(s):  
Surface Modification ◽  
Lanthanide Complexes ◽  
Pure Tio2 ◽  
Adsorption Method ◽  
Nano Tio2 ◽  
Adsorption Time ◽  
Surface Modifier ◽  
Adsorption Temperature ◽  
Element Type ◽  
Suitable Modification

The surface modification of nano-TiO2 was carried out with lanthanide-acetylacetonate complexes by adsorption method. The effects of lanthanide complexes content, lanthanide  element type, adsorption temperature, solvent dosage, adsorption time and other conditions on the photodegradation activity of methyl orange by the modified catalyst were studied, and suitable modification conditions were obtained. The results show that the photocatalytic activity of the modified nano-TiO2 is much higher than that of the unmodified pure TiO2, and the lanthanide-acetylacetonate complexes is an excellent surface modifier.

Response Surface Optimization of Adsorption Conditions of Neutral Red Wastewater by Brewer's Grains

2014 ◽  
Vol 955-959 ◽  
pp. 2859-2863
Author(s):  
Xin Long Jiang ◽  
Yi Hua Jiang ◽  
Cheng Gang Cai
Keyword(s):  
Absorption Rate ◽  
Ph Value ◽  
Neutral Red ◽  
Optimal Parameters ◽  
Adsorption Time ◽  
Response Surface Optimization ◽  
Adsorption Temperature ◽  
Response Optimization ◽  
Maximal Absorption ◽  
Adsorbent Particle

Abstract: Surface response optimization of adsorption conditions of neutral red wastewater by brewer's grains with the factors of pH value, initial concentration,adsorption temperature, adsorption time, adsorbent quantity and the response of adsorption rate were studied. The optimal parameters for adsorption conditions were of adsorbent concentration of 191.24 mg·L-1, adsorbent particle size of 60~80 mesh,pH 4.65, adsorbent amount of 2.56 g·L-1, adsorption time and temperature of 1.92 h and 30°C, respectively. The maximal absorption rate got 99.16%.The brewer's grains is a promising, cheap, efficient, new biological materials of adsorption for neutral red in wastewater.

scholarly journals Polydopamine-Assisted Surface Modification for Bone Biosubstitutes

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Shishu Huang ◽  
Nuanyi Liang ◽  
Yang Hu ◽  
Xin Zhou ◽  
Noureddine Abidi
Keyword(s):  
Tissue Engineering ◽  
Surface Modification ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Coating Layer ◽  
Tissue Scaffolds ◽  
Surface Modifier ◽  
Biomaterial Surface ◽  
Superior Surface ◽  
Unique Surface

Polydopamine (PDA) prepared in the form of a layer of polymerized dopamine (DA) in a weak alkaline solution has been used as a versatile biomimetic surface modifier as well as a broadly used immobilizing macromolecule. This review mainly discusses the progress of biomaterial surface modification inspired by the participation of PDA in bone tissue engineering. A comparison between PDA-assisted coating techniques and traditional surface modification applied to bone tissue engineering is first presented. Secondly, the chemical composition and the underlying formation mechanism of PDA coating layer as a unique surface modifier are interpreted and discussed. Furthermore, several typical examples are provided to evidence the importance of PDA-assisted coating techniques in the construction of bone biosubstitutes and the improvement of material biocompatibility. Nowadays, the application of PDA as a superior surface modifier in multifunctional biomaterials is drawing tremendous interests in bone tissue scaffolds to promote the osteointegration for bone regeneration.

Surface Modification of Nano-TiO2 Microspheres

2021 ◽  
pp. 593-598
Author(s):  
Mengfei Wang ◽  
Chunxiu Zhang ◽  
Xinyue Zhao ◽  
Chenhui Wei ◽  
Zhengran Wang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Nano Tio2 ◽  
Tio2 Microspheres

Study on Adsorption of Cr(VI) in Wastewater by Powdered Activated Carbon

2011 ◽  
Vol 287-290 ◽  
pp. 2070-2073
Author(s):  
Jun Tan Liu ◽  
Shi Jing Liu ◽  
Huan Gao
Keyword(s):  
Activated Carbon ◽  
Powdered Activated Carbon ◽  
Activated Carbon Adsorption ◽  
Effect Of Ph ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Carbon Adsorption ◽  
Adsorption Temperature

This research focuses on absorption of Cr(VI) in wastewater by powdered activated carbon, and determines the effect of pH, initial concentration of solution, amount of powdered activated carbon, adsorption time, adsorption temperature, etc, on adsorption of Cr(VI) in wastewater. The results show that the treatment of 100mL containing Cr(VI) wastewater with concentration of 50mg/L will work best in the conditions of 0.35g powdered activated carbon, pH=3.0, 298K, and 1hour oscillatory adsorption.

The Decoloration Property of Modified Reed Absorbent for Alkaline Fuchsin Wastewater

2013 ◽  
Vol 821-822 ◽  
pp. 365-368
Author(s):  
Yu Ying
Keyword(s):  
Adsorption Isotherm ◽  
Ph Value ◽  
Adsorption Time ◽  
Adsorption Condition ◽  
Adsorption Temperature ◽  
Naoh Solution ◽  
Adsorbent Dose

The modified reed absorbent was obtained by the being treated process with NaOH solution. The decoloration property of modified reed for alkaline fuchsin was studied under different conditions. The effects of adsorbent dose, adsorption temperature, adsorption time and pH value on the decoloration property were investigated, and the optimal adsorption condition was gotten,, the discoloration rate was above 95%. The adsorption isotherm was well represented by the Langmuir.

scholarly journals Preparation of TiO2 and Fe-TiO2 with an Impinging Stream-Rotating Packed Bed by the Precipitation Method for the Photodegradation of Gaseous Toluene

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1173 ◽  
Author(s):  
Guangping Zeng ◽  
Qiaoling Zhang ◽  
Youzhi Liu ◽  
Shaochuang Zhang ◽  
Jing Guo
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Packed Bed ◽  
Pure Tio2 ◽  
Precipitation Method ◽  
Nano Tio2 ◽  
X Ray ◽  
Rotating Packed Bed ◽  
Bet Analysis ◽  
Gaseous Toluene

Nano-TiO2 has always been one of the most important topics in the research of photocatalysts due to its special activity and stability. However, it has always been difficult to obtain nano-TiO2 with high dispersion, a small particle size and high photocatalytic activity. In this paper, nano-TiO2 powder was prepared by combining the high-gravity technique and direct precipitation method in an impinging stream-rotating packed bed (IS-RPB) reactor followed by Fe3+ in-situ doping. TiOSO4 and NH3·H2O solutions were cut into very small liquid microelements by high-speed rotating packing, and the mass transfer and microscopic mixing of the nucleation and growth processes of nano-TiO2 were strengthened in IS-RPB, which was beneficial to the continuous production of high quality nano-TiO2. Pure TiO2 and iron-doped nano-TiO2 (Fe-TiO2) were obtained in IS-RPB and were investigated by means of X-ray diffraction (XRD), Raman, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) and Brunauer–Emmett–Teller (BET) analysis, which found that pure TiO2 had a particle size of about 12.5 nm, good dispersibility and a complete anatase crystal at the rotating speed of packing of 800 rpm and calcination temperature of 500 °C. The addition of Fe3+ did not change the crystalline structure of TiO2. Iron was highly dispersed in TiO2 without the detection of aggregates and was found to exist in a positive trivalent form by XPS. With the increase of iron doping, the photoresponse range of TiO2 to visible light was broadened from 3.06 eV to 2.26 eV. The degradation efficiency of gaseous toluene by Fe-TiO2 under ultraviolet light was higher than that of pure TiO2 and commercial P25 due to Fe3+ effectively suppressing the recombination of TiO2 electrons and holes; the highest efficiency produced by 1.0% Fe-TiO2 was 95.7%.

scholarly journals Preparation and Properties of CaCO3-Supported Nano-TiO2 Composite with Improved Photocatalytic Performance

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3369
Author(s):  
Jie Wang ◽  
Sijia Sun ◽  
Lei Pan ◽  
Zhuoqun Xu ◽  
Hao Ding ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Interaction Mechanism ◽  
Pure Tio2 ◽  
Degradation Efficiency ◽  
Nano Tio2 ◽  
Composite Photocatalyst ◽  
Tio2 Particles ◽  
Grinding Machine

In order to improve the photocatalytic degradation efficiency of nano-TiO2, reduce its usage and realize recycling and reuse, CaCO3–TiO2 composite photocatalyst was prepared with calcium carbonate (CaCO3) and TiO2 in a grinding machine through the integration of grinding depolymerization, dispersion and particle composition. The photocatalytic degradation performance, recycling performance, structure and morphology of CaCO3–TiO2 were studied. The interaction mechanism between CaCO3 and TiO2 and the improvement mechanism for the photocatalytic performance of TiO2 were also discussed. The results show that under the UV light irradiation for 20 and 40 min, the degradation efficiency of methyl orange by the composite photocatalyst with 40% TiO2 (mass fraction) was 90% and 100%, respectively. This was similar to that of pure TiO2, and the performance of the composite photocatalyst was almost unchanged after five cycles. CaCO3–TiO2 is formed by the uniform loading of nano-TiO2 particles on the CaCO3 surface, and the nano-TiO2 particles are well dispersed. Due to the facts that the dispersion of nano-TiO2 is improved in the presence of CaCO3 and the charge transport capability is improved through the interfacial chemical bonds between CaCO3 and TiO2, the formation of this complex is an intrinsic mechanism to improve the photocatalytic efficiency of nano-TiO2 and reduce its usage in application processes.

Research on Influence Factors of Bamboo Charcoal Adsorb Ammonia Nitrogen in Wastewater

2011 ◽  
Vol 356-360 ◽  
pp. 493-497 ◽  
Author(s):  
Zong Ning Li ◽  
Zong Qiang Zhu ◽  
Mei Na Liang ◽  
Hong Dong Qin ◽  
Yi Nian Zhu
Keyword(s):  
Ph Value ◽  
Influence Factors ◽  
Ammonia Nitrogen ◽  
Bamboo Charcoal ◽  
Solution Ph ◽  
Adsorption Ability ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Temperature ◽  
Better Than

The influences of adsorption temperature, adsorption time, dosing quantity, adsorption environment pH value, initial concentration and bamboo charcoal type on adsorption of bamboo charcoal adsorb ammonia nitrogen in wastewater are studied. The result shows that the maximum adsorption values are 1.1715 mg/g and 0.9115 mg/g respectively at 25°C and 40°C. Bamboo charcoal can easily absorb ammonia nitrogen at low temperature condition. 180 min is a suitable adsorption time. Increasing bamboo charcoal dosing quantity is helpful to improve efficiencies of ammonia nitrogen removal in wastewater, but the adsorption capacity is declining as bamboo charcoal dosing quantity increasing. Solution pH value has a great impact on the adsorbed amount, the adsorbed effect in alkaline solution is much better than in acid one’s. The adsorption ability of the moderate temperature bamboo charcoal is higher than the high temperature one’s.

The Adsorption of Zn2+ onto Chitosan-Aluminum Oxide Composite Material

2014 ◽  
Vol 1056 ◽  
pp. 58-61
Author(s):  
Xue Jun Ren ◽  
Qing Gang Gao ◽  
Ming Gao
Keyword(s):  
Composite Material ◽  
Aluminum Oxide ◽  
Raw Material ◽  
Chemical Bonds ◽  
Adsorption Time ◽  
Oxide Composite ◽  
Adsorption Performance ◽  
Adsorption Temperature ◽  
Oxide Composite Material ◽  
Temperature Time

Chitosan-aluminum oxide composite material was synthesized through chemical bonds with chitosan and isopropanol aluminum as raw material, whose structure was characterized by IR, TG. The influence of reaction conditions on adsorption performance were studied, such as temperature, time. Results show that in the composite materials, chemical bonds were existed between aluminum and chitosan, inorganic aluminum oxide evenly dispersed in the surface of chitosan molecular, the thermal stability of the composites is improved significantly. Chitosan-aluminum oxide composite material has good adsorption performance of Zn2+ in solution. The adsorption quantity of Zn2+ increases with the increasing of the adsorption temperature and the adsorption time, and the best adsorption time is 7.0h.

Optimization for Purification Technology of Platycodins by Macroreticular Resin

2013 ◽  
Vol 781-784 ◽  
pp. 852-855
Author(s):  
Xue Yuan Jin ◽  
Hong Liu ◽  
San Fu Zhu
Keyword(s):  
Adsorption Capacity ◽  
Orthogonal Test ◽  
Single Factor ◽  
Macroporous Resin ◽  
Adsorption Time ◽  
Platycodon Grandiflorum ◽  
Adsorption Temperature ◽  
Adsorption Quantity

In order to purify the platycodins from Platycodon grandiflorum, AB-8 macroporous resin was used to test. Based on single factor experiments, orthogonal test was used to optimum the purification conditions. Adsorption pH, adsorption temperature, adsorption time and platycodins concentration were as factors and adsorption capacity was as index. The results were as follows: adsorption pH 6.0, adsorption temperature 40°C, adsorption tim110min, platycodins concentration 2.0mg/mL were the optimization conditions.The adsorption quantity reached at 39.1mg/g. So AB-8 macroporous resin was a suitable resin for purify the platycodins from Platycodon grandiflorum.

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