scholarly journals Effect of the coexistence of SO32− and PO43− on the adsorption performance of zeolite-loaded FeOOH@ZnO for S2−

2021 ◽  
Author(s):  
Fen Li ◽  
Youjing Li ◽  
Baocai Ge ◽  
Jinguang Hu ◽  
Cailian Yu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrothermal Method ◽  
Significant Influence ◽  
Removal Rate ◽  
Adsorption Properties ◽  
Adsorption Rate ◽  
Modified Zeolite ◽  
Adsorption Performance ◽  
Modified Zeolites

Abstract The present study deals with the synthesis of zeolite-loaded FeOOH@ZnO by hydrothermal method and investigates the effects of coexisting SO32− and PO43− ions in the aqueous solution on the adsorption performance for S2−. The results showed that the HNO3-modified zeolite loaded with FeOOH@ZnO (FeOOH@ZnO/HZ) resulted in a maximum S2− removal rate of ≈98%. The adsorbent's performance on removing S2− was significantly enhanced, compared with NaOH and ZnCl2-modified zeolites loaded with FeOOH@ZnO, and the adsorption was proved to be a heat-absorbing process. When SO32− and PO43− coexisted with S2−, SO32− and PO43− had a significant influence on the adsorption properties of FeOOH@ZnO/HZ. When three ions of S2−, SO32− and PO43− were present simultaneously, the adsorption performance of FeOOH@ZnO/HZ on S2− was further, and the removal rate dropped to about 80%. Moreover, FeOOH@ZnO/HZ also adsorbed PO43− and SO32− in the system containing multiple ions, but the adsorption rate of PO43− and SO32− were much lower than S2−. This indicated that the adsorption of S2− in the presence of FeOOH@ZnO/HZ dominates under competitive conditions.

Photocatalytic oxidation of chlorophenols in the presence of manganese ions

1999 ◽  
Vol 39 (10-11) ◽  
pp. 225-230 ◽  
Author(s):  
Jong-Nan Chen ◽  
Yi-Chin Chan ◽  
Ming-Chun Lu
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Photocatalytic Oxidation ◽  
Reaction Rate ◽  
Removal Rate ◽  
Adsorption Rate ◽  
Manganese Ions ◽  
Manganese Ion ◽  
Cp Decomposition ◽  
The Relationship

The decomposition of chlorophenols in aqueous solution with UV-illuminated TiO2 suspensions in the presence of manganese ions was studied. It was found that the removal rate of chlorophenols would be the highest at pH 3 in the presence of 1.18×10−4 M manganese ion. The effect of ionic strength on the 2-CP decomposition can be ignored in the range from 0.1 to 0.005 M for NaClO4. This study is also to explore the relationship between the adsorption rate and reaction rate. Results showed that the more the adsorption rate the more the decomposition rate for the three chlorophenols. Manganese ions can increase the photocatalytic oxidation of 2-chlorophenol in terms of DOC. The relationship between temperature and reaction rate for 2-CP is k = 0.0043T - 1.2146.

scholarly journals Synthesis of chelating polyamine fibers and their adsorption properties for nickel(ii) ions from aqueous solution

RSC Advances ◽  
2017 ◽  
Vol 7 (64) ◽  
pp. 40392-40400 ◽  
Author(s):  
Jianlan Cui ◽  
Yanru Li ◽  
Jian Meng ◽  
Congsan Zhong ◽  
Peng Wang
Keyword(s):  
Aqueous Solution ◽  
Fibrous Material ◽  
Adsorption Properties ◽  
Adsorption Performance

In this work, a novel fibrous material PA–PVAF has been prepared. In the adsorption experiments of Ni(ii), the fibrous material PA–PVAF showed excellent adsorption performance, which can be used as a promising adsorbent.

Preparation of Modified Fly Ash and its Adsorption Properties for U(VI) Uranium

2017 ◽  
Vol 873 ◽  
pp. 107-111 ◽  
Author(s):  
Xi Xie ◽  
Shu Kui Zhou
Keyword(s):  
Experimental Study ◽  
Fly Ash ◽  
Power Plant ◽  
Contact Time ◽  
Southern China ◽  
Removal Rate ◽  
Adsorption Properties ◽  
Adsorption Performance ◽  
Uranium Tailings ◽  
Modified Fly Ash

The paper has taken a fly ash of power plant in southern China as the research object, in view of the fly ash were modified, the research of the modified fly ash on the experimental study of nuclide uranium adsorption of uranium tailings. A modified fly ash and B modified fly ash were prepared with a-zeolite while using Na2CO3 and NaOH as intercalated material respectively. By changing the pH, initial U(VI) ions concentration, temperature of environment, and contact time, the best conditions of adsorption was selected out. By comparing the properties of two different modified fly ash composites, it is not difficult to find that the theoretical adsorption capacity of U(VI) is higher and the removal rate of U(VI) is higher than that of U(VI). Therefore, modified fly ash B had a better adsorption performance.

Characteristics of Cr (VI) Adsorption in Aqueous Solution by Wheat Straw

2013 ◽  
Vol 750-752 ◽  
pp. 1262-1266
Author(s):  
Li Xiu Peng ◽  
Qin Ai Lin
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Wheat Straw ◽  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Adsorption Properties ◽  
Effect Factors ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Performance

The adsorption process of Cr (VI) in aqueous solution on activated carbon prepared by wheat straw was investigated to study the effect factors on adsorption properties. adsorption mechanism was discussed. The results showed that the adsorption performance was influenced by dosage, initial concentration and adsorption time. Adsorption reached equilibrium after 100 min at temperature 25°C. The highest removal efficiency can reach 94%. The results indicated that activated carbon as adsorbent can effectively deal with waste water containing (VI).

scholarly journals Preferable Adsorption of Nitrogen and Phosphorus from Agricultural Wastewater Using Thermally Modified Zeolite–Diatomite Composite Adsorbent

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2053
Author(s):  
Zhang ◽  
Wang ◽  
Li ◽  
Liu ◽  
An ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Removal Rate ◽  
Adsorption Properties ◽  
Pollutant Removal ◽  
Chemical Adsorption ◽  
Nitrogen And Phosphorus ◽  
Surface Distribution ◽  
Composite Adsorbent ◽  
Modified Zeolite ◽  
Practical Applications

Nitrogen and phosphorus adsorbents are widely used to mitigate agricultural non-point source pollution. However, research on adsorbents mainly involves studying chemical adsorption properties, and analyzes of the effects of adsorbent on pollutant removal has not considered the surface morphology of the adsorbent or the surface distribution of pollutants. In this study, we focus on the surface morphology of the adsorbent and the surface distribution of contaminants while examining chemical adsorption properties. The crystal composition of the adsorbent was evaluated by x-ray diffraction (XRD) characterization. Kinetic adsorption data and adsorption isotherms demonstrated that thermally modified zeolite exhibits better nitrogen adsorption. The optimal removal of nitrogen and phosphorus by thermally modified zeolite and diatomite occurred at a 3:2 ratio, reaching a removal rate of 92.07% and 84.61%, respectively. The potential adsorption mechanism of a composite adsorbent for nitrogen and phosphorus capture was investigated by Fourier transform infrared spectroscopy. Scanning electron microscopy mapping, grey image recognition, and gradient recognition confirmed a relationship between the surface morphology of the adsorbent and the distribution of surface pollutants. The larger the surface of the gradient, the more uneven it is, the more nitrogen and phosphorus sites are adsorbed on the surface, and the more nitrogen and phosphorus are adsorbed. These results suggest that thermally modified zeolite/diatomite can serve as a promising adsorbent for nitrogen and phosphorus removal in practical applications.

scholarly journals Effect of waste ceramic adsorbent on wastewater treatment

2018 ◽  
Vol 175 ◽  
pp. 01010 ◽  
Author(s):  
Yao Zheng ◽  
Qun Yuan ◽  
ZiYing Yan ◽  
Jiacheng Liu ◽  
Jingying Liang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Calcination Temperature ◽  
Removal Rate ◽  
Porous Ceramic ◽  
Porous Ceramics ◽  
Adsorption Properties ◽  
Adsorption Time ◽  
Adsorption Performance ◽  
Before And After ◽  
Suitable Amount

The preparation of porous ceramic with waste porcelain powder as aggregate research. The influence of the amount of Sesbania powder and the calcination temperature on the adsorption performance of porous ceramics was investigated. The effect of the amount of porous ceramic and the adsorption time on the removal rate of Cu in wastewater containing Cu was investigated.The results showed that the adsorption properties of porous ceramics were related to the calcination temperature and the amount of Sesbania powder. The suitable calcination temperature and the amount of Sesbania powder were 600 °Cand 4 wt%, respectively.The removal rate of Cu in water samples increases with the increase of the amount of porous ceramics and the increase of adsorption time. The suitable amount of porous ceramics is 10 g/L and the adsorption time is 35 min. XRD characterization showed that the crystal particles were grown by calcination, and the properties of porous ceramics were stable before and after adsorption.

Heterogeneous Fenton Catalytic Removal of Organic Pollutant in Aqueous Solution by using Coal Gangue as a Catalyst

2019 ◽  
Vol 12 (4) ◽  
pp. 312-325
Author(s):  
Jiwei Zhang ◽  
Jingjing Xu ◽  
Shuaixia Liu ◽  
Baoxiang Gu ◽  
Feng Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Removal Rate ◽  
Organic Pollutant ◽  
Coal Gangue ◽  
Ion Leakage ◽  
Heterogeneous Fenton ◽  
Solution Ph ◽  
X Ray

Background: Coal gangue was used as a catalyst in heterogeneous Fenton process for the degradation of azo dye and phenol. The influencing factors, such as solution pH gangue concentration and hydrogen peroxide dosage were investigated, and the reaction mechanism between coal gangue and hydrogen peroxide was also discussed. Methods: Experimental results showed that coal gangue has the ability to activate hydrogen peroxide to degrade environmental pollutants in aqueous solution. Under optimal conditions, after 60 minutes of treatment, more than 90.57% of reactive red dye was removed, and the removal efficiency of Chemical Oxygen Demand (COD) up to 72.83%. Results: Both hydroxyl radical and superoxide radical anion participated in the degradation of organic pollutant but hydroxyl radical predominated. Stability tests for coal gangue were also carried out via the continuous degradation experiment and ion leakage analysis. After five times continuous degradation, dye removal rate decreased slightly and the leached Fe was still at very low level (2.24-3.02 mg L-1). The results of Scanning Electron Microscope (SEM), energy dispersive X-Ray Spectrometer (EDS) and X-Ray Powder Diffraction (XRD) indicated that coal gangue catalyst is stable after five times continuous reuse. Conclusion: The progress in this research suggested that coal gangue is a potential nature catalyst for the efficient degradation of organic pollutant in water and wastewater via the Fenton reaction.

scholarly journals CHARACTERISTICS AND ADSORPTION PERFORMANCE OF FORMULATED TRIKOTAC FILTER AIDS

2019 ◽  
Vol 81 (3) ◽  
Author(s):  
N. Masdiana ◽  
M. Rashid ◽  
S. Hajar ◽  
M. R. Ammar
Keyword(s):  
Particle Size ◽  
Activated Carbon ◽  
Particle Density ◽  
Adsorption Properties ◽  
The Other ◽  
Bet Surface Area ◽  
Adsorption Performance ◽  
Filtration System ◽  
Filter Aids ◽  
The Relationship

TrikotAC filter aids is a combination of a pre-coating material PreKot™ with two adsorbents; activated carbon and lime and their characteristics were investigated in this study. TrikotAC was formulated into three different weight ratios of 5:1:94, 10:1:89 and 10:5:85, respectively. The relationship between adsorption properties and characteristics of the formulated materials particle size distribution, particle density, bulk density, and BET surface area were investigated. The results showed that the adsorption capacity for TrikotAC 10:5:85 (11.88 mg/g) was higher than for the other formulated filter aids samples, and the formulated filter aids material TrikotAC showed promising characteristic as a filter aids and adsorbent for organic compound in fabric filtration system.

scholarly journals Approximate description of multi-solute adsorption rate in organic aqueous solution.

1981 ◽  
Vol 14 (1) ◽  
pp. 73-75 ◽  
Author(s):  
HIROYUKI KAGE ◽  
IKUYA HASHIZUME ◽  
MORIO OKAZAKI ◽  
RYOZO TOEI
Keyword(s):  
Aqueous Solution ◽  
Adsorption Rate ◽  
Approximate Description ◽  
Solute Adsorption

Vanadium pentoxide 1-D nanostructures applied to dye removal from aqueous systems by coupling adsorption and visible-light photodegradation

RSC Advances ◽  
2015 ◽  
Vol 5 (16) ◽  
pp. 12000-12006 ◽  
Author(s):  
Waldir Avansi ◽  
Vagner R. de Mendonça ◽  
Osmando F. Lopes ◽  
Caue Ribeiro
Keyword(s):  
Visible Light ◽  
Hydrothermal Method ◽  
Vanadium Pentoxide ◽  
Dye Removal ◽  
Dye Adsorption ◽  
Adsorption Properties ◽  
Aqueous Systems ◽  
One Dimensional ◽  
1D Nanostructures

This paper evaluates the photocatalytic and dye adsorption properties of highly crystalline orthorhombic vanadium pentoxide (V2O5) one-dimensional (1D) nanostructures, such as nanowires and nanorods, synthesized by a hydrothermal method.

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