The Removal of Phosphorus in Wastewater by Modified 4A Zeolite

2011 ◽  
Vol 356-360 ◽  
pp. 502-505 ◽  
Author(s):  
Yong Yin Zhang ◽  
Li Ping Wang ◽  
Er Deng Du ◽  
Yi Zhong Chen
Keyword(s):  
Reaction Time ◽  
Aluminum Chloride ◽  
Phosphorus Removal ◽  
Room Temperature ◽  
Sem Analysis ◽  
Phosphorus Concentration ◽  
Removal Mechanism ◽  
Adsorption Time ◽  
Initial Concentration ◽  
4A Zeolite

A kind of 4A zeolite, which was modified by magnesium chloride and aluminum chloride, was used to treatment phosphorus wastewater. The effect of several parameters on phosphorus removal was also investigated, including zeolite dosage, pH, phosphorus concentration and the adsorption time. The results showed that, under the conditions of pH 7, the amount of modified 4A zeolite 0.05g, reaction time 15min, room temperature, the removal efficiency of phosphorus with initial concentration 2mg/L reached 98%. The SEM analysis explained that crystalline structure of 4A zeolite has changed after modification, thus resulted in the improvement of adsorption capacity. What’s more, the phosphorus removal mechanism was also discussed.

The Research for Microwave Modified Vermiculite Adsorption of Zn2+

2014 ◽  
Vol 809-810 ◽  
pp. 493-499
Author(s):  
Li Fang Bao ◽  
Chen Li Wang ◽  
Jin Chuan Gu ◽  
Sheng Zhong ◽  
Rui Wang
Keyword(s):  
Reaction Time ◽  
Correlation Coefficient ◽  
Adsorption Isotherms ◽  
Reaction Temperature ◽  
Room Temperature ◽  
Adsorption Equilibrium ◽  
Adsorption Rate ◽  
Absorption Mechanism ◽  
Initial Concentration ◽  
The Impact

The impact on the adsorption of Zn2+of these factors, initial concentration, modification time, reaction time vermiculite dosage, reaction temperature and pH having, and absorption mechanism are studied . The results show that: microwave modification time 30s, reaction time 40min, modified vermiculite dosage 8g/L, reaction temperature 30°C, reaction pH 6, Zn2+ adsorption rate can reach 97.91%, adsorption isotherms of Zn2+ by microwave modified vermiculite show that the adsorption equilibrium is consistent with Langmuir curves, correlation coefficient reached to 0.997 at room temperature.

Study on the Photocatalytic Degradation of Diesel Pollutants over a Sol-Gel Prepared TiO2

2012 ◽  
Vol 476-478 ◽  
pp. 1926-1929
Author(s):  
Xiao Cai Yu ◽  
Dong Dong Hu ◽  
Qian Du ◽  
Xv Zheng ◽  
Ji Yao Guo
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Room Temperature ◽  
Ph Value ◽  
Removal Rate ◽  
Sol Gel ◽  
Initial Concentration ◽  
Five Factors ◽  
Degradation Reaction ◽  
Diesel Degradation

Nanoscale titanium dioxide (TiO2) has been fabricated through a sound sol-gel method at room temperature with Tetra-n-butyl Titanate as the precursor, and the particles are characterized by XRD and TEM techniques. The results manifest that the as-prepared TiO2 is amorphous with the anatase structure and its size is around 33.2nm. Five factors, including dosage of TiO2, initial concentration of diesel, pH value, photocatalytic degradation reaction time and the presence of H2O2, are considered in the diesel degradation experiments. An orthogonal test is carried out to optimize the photocatalytic degradation of diesel pollutants based on the single-factor experiments. It reveals that when the dosage of TiO2 is 1.0g/L, the initial concentration of diesel is 0.5g/L, pH value is 6, the reaction time is 4h and the H2O2 dosage is 0.09%, the removal rate of diesel pollutants can up to 88%. Besides, the influence of each factor on removing diesel can be arranged in decreasing order: initial concentration of diesel> photocatalytic reaction time> pH value> TiO2 dosage> H2O2 dosage.

scholarly journals Activation and Characterization of Algerian Kaolinite, New and Green Catalyst for Synthesis of Polystyrene and Poly(1,3-dioxolane)

2021 ◽  
Vol 15 (4) ◽  
pp. 551-558
Author(s):  
Sarra Sabrina Aiche ◽  
◽  
Hodhaifa Derdar ◽  
Zakaria Cherifi ◽  
Mohammed Belbachir ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Reaction Time ◽  
1H Nmr ◽  
Room Temperature ◽  
Exchange Process ◽  
Sem Analysis ◽  
Green Catalyst ◽  
Modified Clay ◽  
Calculated Molecular Weight ◽  
Ft Ir

In the present work we have explored a new catalyst prepared with Algerian clay and a new method to synthesise polystyrene and poly(1,3-dioxolane). This technique consists of using Algerian modified clay (Kaolinite-H+) as a green catalyst. Kaolinite-H+ is a proton exchanged clay which is prepared through a simple exchange process. Synthesis experiments are performed in bulk. The polymerization of styrene in bulk leads to the yield of 83 % at room temperature with the reaction time of 3 h. Molecular weight of the obtained polystyrene is calculated by 1H NMR and is about 2196 g/mol. Polymerization of (1,3-dioxolane) is carried out at room temperature with the reaction time of 3 h and polymerization yield of 91 %. The calculated molecular weight of the obtained poly(1,3-dioxolane) is about 573 g/mol. The structure of the obtained polymers is confirmed by FT-IR and 1H NMR. The modified clay (Kaolinite-H+) is characterized by FT-IR, XRD and SEM analysis.

Preparation of Nano-MnO2 and Adsorption of Reactive Brilliant Blue

2016 ◽  
Vol 847 ◽  
pp. 294-298
Author(s):  
Xiao Feng Fan ◽  
Yue Cheng
Keyword(s):  
Reaction Time ◽  
Room Temperature ◽  
Particle Diameter ◽  
Solution Concentration ◽  
Brilliant Blue ◽  
Uniform Size ◽  
Initial Concentration ◽  
One Step ◽  
Ft Ir ◽  
Xrd Patterns

MnO2 nanoparticles were prepared by one-step redox under room temperature. The sample was characterized by XRD, SEM, TEM and FT-IR. The results indicated that the MnO2 nanoparticles was amorphous δ-MnO2 with the uniform size of 10-20nm in particle diameter, which can be seen by XRD patterns. The four peaks appear at 2θ = 23.24°,36.1°,45.42°and 64.38°, respectively. FT-IR results showed the 519 cm-1 as Mn-O features manganese dioxide absorption. The effect of the pH, nanoMnO2 dosage, reaction time, reaction temperature and initial concentration were studied on the removal of reactive brilliant blue. It was found that the removal ability of reactive brilliant blue was the best under the selected conditions: pH was 3.0, dosage of nanoMnO2 was 0.05g, KN-R solution concentration was 5mg / L, reaction time was 2h, temperature was 25°C.

Study on the Removal of Copper Ions from Water Using Eco-Friendly Attapulgite/Chitosan Composites

2012 ◽  
Vol 499 ◽  
pp. 419-422
Author(s):  
Yong Chen ◽  
Hui Xu ◽  
Jin Bao Sun ◽  
Chang Long Zhang
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Room Temperature ◽  
Copper Ions ◽  
External Factors ◽  
Mass Ratio ◽  
Absorption Time ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorbent Dosage

In this work attapulgite and chitosan were employed to prepare composites as eco-friendly adsorbent. Study on the removal efficiency of the adsorbent for copper ions in aqueous solution was carried out. External factors such as the amount of attapulgite in the composites, temperature, initial concentration of copper ions, adsorption time and adsorbent dosage how to influence the removal efficiency of composites were investigated. The results showed that at room temperature, 0.37g adsorbent can reach maximum adsorption rate, which the mass ratio of attapulgite and chitosan is 1:1, the initial concentration of copper ions is 50mg / L and absorption time is 2h.

Adsorption of Cr(VI) from Aqueous Solution by two Kinds of Pillared Bentonites

2013 ◽  
Vol 690-693 ◽  
pp. 1037-1040
Author(s):  
Zhen Wang ◽  
Ze Sheng Cheng ◽  
Yu Liu ◽  
Na Na Bo ◽  
Shu Ping Li
Keyword(s):  
Aqueous Solution ◽  
Sem Analysis ◽  
Optimum Conditions ◽  
Experimental Conditions ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Performance ◽  
Better Than

The hydroxy-aluminum pillared bentonite(OH-Al-bent) and aluminum pillared bentonite(Al-bent) were synthesized and characterized by XRD and SEM analysis. The yield of products and the adsorbent capabilities for Cr(Ⅵ) from aqueous solution were investigated, and the optimal experimental conditions including adsorption time, reagent dosage, the initial concentration of Cr(Ⅵ) and PH that might influent the adsorption performance were also investigated. It was observed that the adsorption capabilities of OH-Al-bent was better than Al-bent. The efficiency of Cr(Ⅵ) removal were better when the dosage of the sorbent was higher. And a reagent dosage of 7g/L, adsorption time of 60min, PH of 4 were selected as an optimum conditions.

Tyrosine-Selective Bioconjugation with Iminoxyl Radicals

2020 ◽  
Author(s):  
Katsuya Maruyama ◽  
Takashi Ishiyama ◽  
Yohei Seki ◽  
Kounosuke Oisaki ◽  
Motomu Kanai
Keyword(s):  
Reaction Time ◽  
Steric Hindrance ◽  
Room Temperature ◽  
Water Soluble ◽  
Light Irradiation ◽  
Sodium Ascorbate ◽  
Iminoxyl Radical ◽  
Short Reaction Time ◽  
Modified Peptides ◽  
The Stability

A novel Tyr-selective protein bioconjugation using the water-soluble persistent iminoxyl radical is described. The conjugation proceeded with high Tyr-selectivity and short reaction time under biocompatible conditions (room temperature in buffered media under air). The stability of the conjugates was tunable depending on the steric hindrance of iminoxyl. The presence of sodium ascorbate and/or light irradiation promoted traceless deconjugation, restoring the native Tyr structure. The method is applied to the synthesis of a protein-dye conjugate and further derivatization to azobenzene-modified peptides.

scholarly journals Optimizing Adsorption of 17α-Ethinylestradiol from Water by Magnetic MXene Using Response Surface Methodology and Adsorption Kinetics, Isotherm, and Thermodynamics Studies

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3150
Author(s):  
Mengwei Xu ◽  
Chao Huang ◽  
Jing Lu ◽  
Zihan Wu ◽  
Xianxin Zhu ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Quadratic Model ◽  
Adsorption Efficiency ◽  
Process Variables ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Independent Variables ◽  
The Impact ◽  
Adsorbent Dose

Magnetic MXene composite Fe3O4@Ti3C2 was successfully prepared and employed as 17α-ethinylestradiol (EE2) adsorbent from water solution. The response surface methodology was employed to investigate the interactive effects of adsorption parameters (adsorption time, pH of the solution, initial concentration, and the adsorbent dose) and optimize these parameters for obtaining maximum adsorption efficiency of EE2. The significance of independent variables and their interactions were tested by the analysis of variance (ANOVA) and t-test statistics. Optimization of the process variables for maximum adsorption of EE2 by Fe3O4@Ti3C2 was performed using the quadratic model. The model predicted maximum adsorption of 97.08% under the optimum conditions of the independent variables (adsorption time 6.7 h, pH of the solution 6.4, initial EE2 concentration 0.98 mg L−1, and the adsorbent dose 88.9 mg L−1) was very close to the experimental value (95.34%). pH showed the highest level of significance with the percent contribution (63.86%) as compared to other factors. The interactive influences of pH and initial concentration on EE2 adsorption efficiency were significant (p < 0.05). The goodness of fit of the model was checked by the coefficient of determination (R2) between the experimental and predicted values of the response variable. The response surface methodology successfully reflects the impact of various factors and optimized the process variables for EE2 adsorption. The kinetic adsorption data for EE2 fitted well with a pseudo-second-order model, while the equilibrium data followed Langmuir isotherms. Thermodynamic analysis indicated that the adsorption was a spontaneous and endothermic process. Therefore, Fe3O4@Ti3C2 composite present the outstanding capacity to be employed in the remediation of EE2 contaminated wastewaters.

Enantioselective Resolution of (R, S)-DMPM by a Adsorption-Covalent Crosslinked Esterase PAE07 from Pseudochrobactrum Asaccharolyticum WZZ003

2021 ◽  
Author(s):  
Mingpeng Zhou ◽  
Yuandan Xia ◽  
Hongjun Zhang ◽  
Xinjun Yu ◽  
Yinjun zhang
Keyword(s):  
Thermal Stability ◽  
Enzyme Activity ◽  
Sem Analysis ◽  
Optimal Conditions ◽  
Synthetic Resin ◽  
Adsorption Time ◽  
Enantioselective Resolution ◽  
Primary Amino ◽  
Repeated Use ◽  
Amino Resin

Abstract (R)-N-(2,6-dimethylphenyl) alanine ((R)-MAP-acid) is an important chiral intermediate of the Fungicide (R)-Metalaxyl. In this study, ten kinds of immobilized resins(XAD1180N, H103, HAD7HP, D3520, NKA, D101 , DM11,850 JinKai, Primary amino resin and 850 synthetic resin) were used to adsorption-covalent crosslinked esterase PAE07 for splitting (R, S)-DMPM. The resin D3520 with porous structure and hydrophobic polystyrene was selected for immobilization as the carrier, after optimization of the immobilization conditions, the enzyme load is 20:1 (mg/g), the adsorption time is 4h, and the adsorption buffer pH is 7.0 . The Km and Vmax of the free esterases were 35.66 mM and 4.46 mM/mg·min, respectively, The Km and Vmax of the immobilized PAE07 were 19.05 mM and 2.84 mM/mg·min. The SEM analysis showed that the immobilized esterase PAE07 had higher thermal stability, pH stability and substrate specifity than those from the free esterase. Under the optimal conditions,the reaction was carried out at 35°C and 200 rpm for resolution of 350 mM substrate for 14 hours, the conversion rate reached 48%, and the e.e.p was 99.5%.The repeatability of immobilized esterase PAE07 was evaluated by continuous catalytic resolution of (R, S)-DMPM. The results showed that after 15 times of repeated use, 86.2% of the relative enzyme activity was retained. These results proved that immobilized esterase PAE07 as a new catalyst had great potential for the application and industrial enzymatic resolution of (R, S)-DMPM to prepare (R)-metalaxyl.

Sign in / Sign up

Export Citation Format

Share Document