scholarly journals Efficient Removal of Azlocillin Sodium from Water by Polystyrene Anion Exchange Resin Supported MIL-53

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2195
Author(s):  
Yi Qian ◽  
Haoyan Fu ◽  
Long Li ◽  
Wenyuan Su ◽  
Jiayin Li ◽  
...  
Keyword(s):  
Removal Rate ◽  
Animal Husbandry ◽  
Basic Structure ◽  
Order Kinetic ◽  
Adsorption Model ◽  
X Ray Diffraction ◽  
Efficient Removal ◽  
Isothermal Model ◽  
Nanocomposite Adsorbent

Due to the widespread use of antibiotics in medical treatment, animal husbandry and aquaculture, a large number of antibiotics are discharged into the environment as metabolites or in their original state, causing pollution to water bodies, which is a serious issue. In this study, a novel nanocomposite adsorbent MIL-53/D201 was successfully prepared by hydrothermal synthesis. This approach overcomes the disadvantage of easy dissociation of MOF material in the water phase and realizes the efficient removal of antibiotic azlocillin sodium in water. The crystal morphology and basic structure of the composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy scattering spectroscopy (EDS), and specific surface area and porosity analyzer (BET). The results showed that MIL-53 was successfully synthesized in situ in D201. The results of adsorption experiments show that the maximum saturated adsorption capacity of the composite is 122.3 mg/g when the dosage of the composite is 1.0 g/L. Compared with pure MIL-53 material, the composite material exhibits greater stability and efficient adsorption performance for target pollutants at different pH values. The adsorption process accords with the quasi-second-order kinetic adsorption model and Langmuir adsorption isothermal model. After five cycles of adsorption and desorption, the removal rate of MIL-53/D201 to azlocillin sodium was still above 87%.

scholarly journals Direct observation of dimethyl sulfide trapped by MOF proving efficient removal of sulfur impurities

RSC Advances ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 4710-4714 ◽  
Author(s):  
Masashi Morita ◽  
Akira Yonezu ◽  
Shinpei Kusaka ◽  
Akihiro Hori ◽  
Yunsheng Ma ◽  
...  
Keyword(s):  
Single Crystal ◽  
Direct Observation ◽  
Dimethyl Sulfide ◽  
X Ray Diffraction ◽  
Efficient Removal ◽  
X Ray

OMSs in HKUST-1 can strongly trap DMS even under humid conditions, which was directly proved by in situ single-crystal X-ray diffraction and Raman measurements.

The Bentonite Copolymer Composite for Removing Lead Ions

2013 ◽  
Vol 750-752 ◽  
pp. 47-50
Author(s):  
Wen Juan He ◽  
Yu Feng He ◽  
Zhen Hua Zhang ◽  
Ju Hua Guo ◽  
Rong Min Wang
Keyword(s):  
Kinetic Model ◽  
Maleic Anhydride ◽  
In Situ Polymerization ◽  
Removal Rate ◽  
Order Kinetic ◽  
Adsorption Dynamics ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Polymer Adsorbent

In this paper, a new kind of clay copolymer adsorbent, bentonite compositing with maleic anhydride (MAH)-acrylic acid (AA)-vinyl acetate (VAc) copolymer (NaB/PMAV) was prepared by in-situ polymerization. It was used as polymer adsorbent for removing Pb (II) ions in wastewater.. Under the optimal condition of adsorption, the removal rate reached to 94.4% and the adsorption capacity got to 235.9 mg/g. Adsorption dynamics were consistent with pseudo-second-order kinetic model and isotherm model can meet the Langmuir isotherm.

scholarly journals In situ synthesis of layered double hydroxides on γ-Al2O3 and its application in chromium(VI) removal

2017 ◽  
Vol 75 (6) ◽  
pp. 1466-1473 ◽  
Author(s):  
Shifeng Li ◽  
Fang Qi ◽  
Min Xiao ◽  
Hongtao Fan ◽  
Yanming Shen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Layered Double Hydroxides ◽  
Adsorptive Capacity ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Chromium Vi ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Double Hydroxides

Mg-Al layered double hydroxides (LDHs) adsorbent was synthesized in situ on γ-Al2O3 for the removal of Cr(VI) from aqueous solution. The material was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electronic microscopy and thermogravimetry and differential thermal analysis. Compared to the LDHs powder, the calcined LDHs sorbent prepared in situ on γ-Al2O3 had higher specific surface area and was easy to recover and reuse. The adsorptive capacity for removing Cr(VI) from aqueous solution was resulting from the memory effect of LDHs based on the XRD results. Both the pseudo-second-order kinetic model and the Langmuir model fit the experimental data well. Furthermore, the adsorbent exhibits excellent sorption–regeneration performances.

Preparation of Polyaniline/Cotton Composite for Cr (VI) Removal in Solution

2017 ◽  
Vol 1142 ◽  
pp. 285-290 ◽  
Author(s):  
Tian Qi Hao ◽  
Yi Zhen Zhan ◽  
Bao Jiang Liu ◽  
Wei Wang ◽  
Dan Yu
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Kinetics ◽  
Rate Equation ◽  
Removal Rate ◽  
Oxidative Polymerization ◽  
Isothermal Model ◽  
Pseudo Second Order ◽  
Prepared Composite ◽  
Order Rate Equation

In this work, polyaniline (PANI)/cotton composite was prepared by in-situ oxidative polymerization and applied to remove Cr (VI) in solution. The as-prepared composite shows a high Cr (VI) removal rate (93.81%) at pH=2. Meanwhile, the adsorption kinetics follows the pseudo-second-order rate equation and the adsorption isotherm data fits well to the Langmuir isothermal model.

Effect of inorganic salt ions on the adsorption of quinoline using coal powder

2018 ◽  
Vol 78 (3) ◽  
pp. 496-505 ◽  
Author(s):  
Yue Bian ◽  
Hao Sun ◽  
Yunxiao Luo ◽  
Qieyuan Gao ◽  
Guosheng Li ◽  
...  
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Inorganic Salt ◽  
Removal Rate ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Isothermal Adsorption ◽  
Adsorbed Amount ◽  
Salt Ions ◽  
Coal Powder

Abstract In this study, coal powder was used as the adsorbent for quinoline. The effect of inorganic salt ions on the adsorption was explored, and the results suggest that the addition of inorganic salt ions can enhance both the removal rate and the amount of quinoline adsorbed. The removal rate and adsorbed amount of quinoline were 83.87% and 1.26 mg/g without inorganic salt ions. Under the same adsorption conditions, the removal rate and adsorbed amount of quinoline could reach 90.21% and 1.35 mg/g when Na+ was present in the solution, and 94.47% and 1.42 mg/g with the presence of Ca2+. In addition, the adsorption of quinoline using coal fitted the Freundlich isothermal adsorption model. Changes in the Gibbs free energy, entropy and heat of adsorption were all negative, indicating that the adsorption was spontaneous and exothermic. The changes in the absolute value of Gibbs free energy under both Na+ and Ca2+ were higher than that in the blank(without inorganic salt ions). The pseudo-second-order kinetic model was found to fit the adsorption kinetic data well, and the activation energy of adsorption under Na+ and Ca2+ were lower than that in the blank. These indicate that the addition of inorganic salt ions was beneficial to the adsorption process.

scholarly journals The study on adsorption behavior of 2,4-DCP in solution by biomass carbon modified with CTAB-KOH

2020 ◽  
Vol 82 (8) ◽  
pp. 1535-1546
Author(s):  
Dajun Ren ◽  
Hongyan Yu ◽  
Jian Wu ◽  
Zhaobo Wang ◽  
Shuqin Zhang ◽  
...  
Keyword(s):  
Removal Rate ◽  
Surface Group ◽  
Order Kinetic ◽  
Biomass Carbon ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Before And After ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir

Abstract In this study, rice straw was used to prepare biomass carbon, which was modified with KOH and cetyltrimethylammonium bromide (CTAB) to obtain modified biomass carbon (MBC). The biomass carbon (BC) before and after modification was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR), and the surface morphology, crystal structure and surface group characteristic BC were explored. The specific surface area and micropores of the modified biomass carbon increased significantly, the crystallinity was higher, and the pore structure was more clearly found. The adsorption performance of MBC for 2,4-dichlorophenol (2,4-DCP) was investigated. The results showed that under the best adsorption conditions ((2,4-DCP concentration (200 mg/L), MBC dosage (50 mg), pH (5.5), and loading time (60 min), temperature (room temperature)), the removal rate of 2,4-DCP was up to 42.5%, and adsorption capacity was 85.13 mg/g. The adsorption of 2,4-DCP on MBC materials was better explained by the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model. It was believed that the adsorption of 2,4-DCP by MBC was the monolayer adsorption process on the uniform surface of MBC at high concentration, and there was no interaction between the 2,4-DCP and MBC adsorbate during this process.

scholarly journals Removal of Cr(VI) from Aqueous Solution by Polypyrrole/Hollow Mesoporous Silica Particles

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 686 ◽  
Author(s):  
Linlin Du ◽  
Peng Gao ◽  
Yuanli Liu ◽  
Tsuyoshi Minami ◽  
Chuanbai Yu
Keyword(s):  
Mesoporous Silica ◽  
Binary Systems ◽  
In Situ Polymerization ◽  
Removal Rate ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Hollow Mesoporous Silica

The removal of Cr(VI) in wastewater plays an important role in human health and environment. In this work, polypyrrole/hollow mesoporous silica particle (PPy/HMSNs) adsorbents have been newly synthesized by in-situ polymerization, which prevent the aggregation of pyrrole in the process of polymerization and exhibit highly selective and powerful adsorption ability for Cr(VI). The adsorption process was in good agreement with the quasi-second-order kinetic model and the Langmuir isotherm model. And the maximum adsorption capacity of Cr(VI) was 322 mg/g at 25 °C. Moreover, the removal rate of Cr(VI) by PPy/HMSNs was ~100% in a number of binary systems, such as Cl−/Cr(VI), NO3−/Cr(VI), SO42−/Cr(VI), Zn2+/Cr(VI), Fe3+/Cr(VI), Sn4+/Cr(VI), and Cu2+/Cr(VI). Thus, the PPy/HMSNs adsorbents have great potential for the removal of Cr(VI) in wastewater.

scholarly journals Simultaneous removal of fluoride and arsenic in geothermal water in Tibet using modified yak dung biochar as an adsorbent

2018 ◽  
Vol 5 (11) ◽  
pp. 181266 ◽  
Author(s):  
Luo Chunhui ◽  
Tian Jin ◽  
Zhu Puli ◽  
Zhou Bin ◽  
Bu Duo ◽  
...  
Keyword(s):  
Removal Rate ◽  
Energy Dispersive Spectrometer ◽  
Biomass Energy ◽  
Geothermal Water ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Order Kinetic Model ◽  
High Concentrations ◽  
Yak Dung

Fluoride (F) and arsenic (As) are two typical and harmful elements that are found in high concentrations in geothermal water in Tibet. In this work, yak dung, an abundant source of biomass energy in Tibet, was made into biochars (BC1, BC2 and BC3) by pyrolysis under different conditions, and the better biochar was modified by FeCl 2 (Fe-BC3). The adsorption conditions were optimized to adsorb F and As in geothermal water. The results showed that BC3 can remove 90% F − and 20% As(V), which is the best effect of the three initial biochars. Fe-BC3 could remove 94% F − and 99.45% As(V) under the same conditions as BC3, which was an adsorbent dosage 10 g l −1 , pH 5–6 and temperature of 25°C. It was also demonstrated that the removal rate did not decrease at 80°C. A quasi-second-order kinetic model best described the adsorption behaviour of ions on the surface of the biochar. The maximum adsorption capacity of F − and As(V) on Fe-BC3 was 3.928 mg g −1 and 2.926 mg g −1 , respectively. The features of Fe-BC3 were characterized by X-ray diffraction, Fourier transform infrared, Brunauer–Emmett–Teller, energy-dispersive spectrometer and scanning electron microscopy to understand the adsorption process.

Diatomite in situ loaded by MOF (ZIF-8) and its application in removing methylene orange from aqueous solutions

BioResources ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 265-275 ◽  
Author(s):  
Zicheng Chen ◽  
Huiwen Zhang ◽  
Wenlong Luo ◽  
Zhibin He ◽  
Lanhe Zhang
Keyword(s):  
Removal Rate ◽  
High Surface ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Zeolitic Imidazolate Framework ◽  
Surface Areas ◽  
Methylene Orange ◽  
Environmental Material ◽  
Metal Organic

Diatomite is extensively used as a natural environmental material because of its biogenic origin and stable structure. The zeolitic imidazolate framework (ZIF-8) is a prototypical metal-organic frame (MOF) that is well known for its high surface areas and chemical stability. Herein, a facile method for the generation of diatomite in situ loaded by ZIF-8 (D/Z) was reported. The results of powder x-ray diffraction (PXRD) analysis confirmed the successful loading of ZIF-8 on the diatomite. The ZIF-8 were distributed uniformly on the surface of the diatomite from the scanning electron microscope (SEM) images. The specific surface of the D/Z increased due to the loading of the ZIF-8. Methylene orange (MO-) in an aqueous form was efficiently separated and removed through a simple mixture and filtration process where the D/Z was employed as an absorbent, and the removal rate of the MO- increased in the case of the sample with more ZIF-8 loaded on the diatomite. In addition, the D/Z was reused after several regenerations by washing out the adsorbed dye.

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