8 results on '"Duan, Guojian"'
Search Results
2. The Study of Amidoxime-Functionalized Cellulose Separate Th(IV) from Aqueous Solution.
- Author
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Zhi, Yiling, Duan, Guojian, Lei, Zhiwei, Chen, Hui, Zhang, Haobo, Tian, Huining, and Liu, Tonghuan
- Subjects
FOURIER transform infrared spectroscopy ,SILICONES ,ADSORPTION (Chemistry) ,SCANNING electron microscopy ,INTERFACIAL tension - Abstract
Selective extraction of low-concentration thorium (Th(IV)) from wastewater is a very important research topic. In this paper, amidoxime cellulose was synthesized, and its composition and structure were characterized by FT-IR, SEM, XPS, and elemental analysis. The adsorption experiment results showed that the adsorption reaction was a spontaneous exothermic process. When the solid–liquid ratio was 0.12 g/L and the pH value was 3.5, the adsorption percentage of the Th(IV) in water onto amidoxime-functionalized cellulose (AO-CELL) could reach over 80%. The maximum adsorption capacity can reach to 450 mg/g. At the same time, the adsorption selectivity, desorption process and reusability of the material were also studied. The results showed that the AO-CELL had a good selectivity for Th(IV) in the system with Sr
2+ , Cu2+ , Mg2+ , Zn2+ , Pb2+ , Ni2+ , and Co2+ as co-ions. In the nitric acid concentration of 0.06 mol/L system, the AO-CELL desorption rate of Th(IV) can reach 95%, and the adsorption rate of Th(IV) in aqueous solution of AO-CELL is still above 60% when the AO-CELL is reused four times. The above results show that the amidoxime cellulose adsorption material synthesized by our research group has good selective adsorption performance for Th(IV) of a low concentration in an aqueous solution and has a good practical application value. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
3. Synthesis of stable mesoporous Zr-MOFs using pyrazine-containing ligand for efficient capture of Pb(II) in wastewater.
- Author
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Liu, Lixiang, Wu, Laidi, Chen, Yue, Ma, Yongfei, Lin, Li, Li, Shuo, Yang, Xiujuan, Chen, Hui, and Duan, Guojian
- Subjects
ADSORPTION isotherms ,LIGANDS (Chemistry) ,PHYSISORPTION ,ADSORPTION kinetics ,ADSORPTION capacity ,SEWAGE ,PYRAZINES - Abstract
[Display omitted] By optimizing the reaction conditions, a zirconium-based adsorbent Zr-PzDC with pyrazine-2,5-dicarboxylic acid as the ligand was synthesized for the treatment of lead ions in an aqueous solution. SEM, EDS-Mapping, XRS and FT-IR characterization confirmed the synthesis of Zr-PzDC. Meanwhile, BET results show that Zr-PzDC is a typical mesoporous material. The analysis of the binding process of Zr-PzDC with Pb(II) in water shows that the adsorption kinetics conform to the pseudo-second-order model; The adsorption isotherm data fits well with the Langmuir model, and the maximum adsorption capacity of Pb(II) is 298.39 mg/g; The thermodynamic parameters show that the adsorption of Pb(II) in water is a spontaneous endothermic process. Combined with the XPS spectral results, physical adsorption is the main binding mode, and single-layer chemisorption is the limiting step in the adsorption process. The results of both static and dynamic column adsorption experiments show that Zr-PzDC can treat lead ions quickly and efficiently, and has excellent reusable performance, which makes Zr-PzDC have good application potential in treating lead-containing wastewater of the battery production process. • The maximum adsorption capacity of Zr-PzDC for Pb(II) is 298.39 mg/g. • The adsorption of Pb(II) reach 90% of the maximum adsorption amount in 1 min. • Zr-PzDC exhibits excellent stability, pH suitability and reusability. • Physical adsorption is the main form; chemisorption is the rate-limiting step. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Synthesis of selective biodegradable amidoxime chitosan for absorption of Th(IV) and U(VI) ions in solution.
- Author
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Ma, Jiaju, Lei, Zhiwei, Zhou, Yun, Dong, Tianhao, Hu, Peizhuo, Duan, Guojian, and Liu, Tonghuan
- Subjects
ABSORPTION ,IONS ,POISONS ,THORIUM ,SORBENTS ,LYSOZYMES ,ADSORPTION (Chemistry) ,CHITOSAN - Abstract
Radionuclide extraction from wastewater is a long-term process, in which the study on the reuse and decomposition of adsorbents provides the ability to complete the post-treatment after adsorption. Herein, A novel biodegradable amidoxime chitosan has been synthesized through one-step without crosslinking agent and characterized by FT-IR, SEM, XPS, TGA and element analysis. The batch adsorption experiments of U(VI) and Th(IV) on AO-CTS adsorbent were studied and maximum adsorption of U(VI) and Th(IV) were 97 and 56 mg/g, respectively. The U(VI) and Th(Ⅳ) can be effectively desorbed from the AO-CTS materials at low acidity, The AO-CTS can be reused 6 times without reducing absorbency for U(VI) and Th(Ⅳ). When finish the adsorption process, the AO-CTS can be degraded by lysozyme at room temperature, there were no toxic or harmful substances are produced. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
5. Adsorptive features of poli(acrylic acid-co-hydroxyapatite) composite for $$ {{\text{UO}}_{ 2}}^{{ 2 { + }}} $$ UO 2 2 +
- Author
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Liu Tonghuan, Tan Yinping, Duan Guojian, Xu Zhen, Wu Wangsuo, and Zhong Qiangqiang
- Subjects
Materials science ,Health, Toxicology and Mutagenesis ,02 engineering and technology ,010403 inorganic & nuclear chemistry ,01 natural sciences ,Analytical Chemistry ,Metal ,symbols.namesake ,chemistry.chemical_compound ,Adsorption ,Hydroxyapatite composite ,Radiology, Nuclear Medicine and imaging ,Spectroscopy ,Acrylic acid ,Aqueous solution ,Chromatography ,Public Health, Environmental and Occupational Health ,Sem analysis ,Langmuir adsorption model ,021001 nanoscience & nanotechnology ,Pollution ,0104 chemical sciences ,Nuclear Energy and Engineering ,chemistry ,visual_art ,visual_art.visual_art_medium ,symbols ,Physical chemistry ,Sorption isotherm ,0210 nano-technology - Abstract
The copolymer of poli(acrylic acid-co-hydroxyapatite) (PAA-HAP) was prepared and characterized by means of FT-IR and SEM analysis. The adsorptive features of PAA-HAP for $$ {{\text{UO}}_{ 2}}^{{ 2 { + }}} $$ was studied as a function of pH, adsorbent dosage, initial metal ion concentration and temperature. The adsorption isotherm data fitted well to the Langmuir isotherm model. The adsorbed $$ {{\text{UO}}_{ 2}}^{{ 2 { + }}} $$ can be desorbed effectively by 0.1 M HNO3. The maximum adsorption capacities for $$ {{\text{UO}}_{ 2}}^{{ 2 { + }}} $$ of the dry PAA-HAP was 1.86 × 10−4 mol/g. The high adsorption capacity and kinetics results indicate that PAA-HAP can be used as an alternative adsorbent to remove $$ {{\text{UO}}_{ 2}}^{{ 2 { + }}} $$ from aqueous solution.
- Published
- 2015
6. Adsorption of UO2 2+ on poly(N,N-diethylacrylamide-co-acrylic acid): effects of pH, ionic strength, initial uranyl concentration, and temperature
- Author
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Yang Ying, Liu Tonghuan, Duan Xiaojiang, Duan Guojian, Zhang Hongxia, and Wu Wangsuo
- Subjects
Exothermic reaction ,Aqueous solution ,Health, Toxicology and Mutagenesis ,Inorganic chemistry ,Public Health, Environmental and Occupational Health ,Langmuir adsorption model ,Sorption ,Uranyl ,Pollution ,Analytical Chemistry ,symbols.namesake ,chemistry.chemical_compound ,Adsorption ,Nuclear Energy and Engineering ,chemistry ,Ionic strength ,Polymer chemistry ,symbols ,Radiology, Nuclear Medicine and imaging ,Spectroscopy ,Acrylic acid - Abstract
We prepared poly(N,N-diethylacrylamide-co-acrylic acid) (P(DEA-co-AA)) microgels which could efficiently remove UO2 2+ from aqueous solutions. In this study, the effect of adsorption parameters such as pH value, adsorbent dose, shaking time, and temperature has investigated. It is found that the pseudo-second-order model is more suitable for our experiment. The adsorption kinetic data indicated that the chemical adsorption was the swiftness processes, the adsorption equilibrium could be achieved within 30 min. And there are very good correlation coefficients of linearized equations for Langmuir isotherm model, which indicated that the sorption isotherm of the hydrogel for UO2 2+ can be fitted to the Langmuir isotherm model. The adsorption process was spontaneous (∆G 0
- Published
- 2013
7. Adsorptive features of polyacrylic acid hydrogel for UO2 2+
- Author
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Liu Tonghuan, Duan Guojian, Duan Xiaojiang, Yang Ying, and Wu Wangsuo
- Subjects
Liquid ratio ,Health, Toxicology and Mutagenesis ,Metal ions in aqueous solution ,Polyacrylic acid ,Radical polymerization ,Inorganic chemistry ,Public Health, Environmental and Occupational Health ,Pollution ,Analytical Chemistry ,Ion ,chemistry.chemical_compound ,Adsorption ,Nuclear Energy and Engineering ,chemistry ,Adsorption kinetics ,Radiology, Nuclear Medicine and imaging ,Fourier transform infrared spectroscopy ,Spectroscopy - Abstract
Polyacrylic acid hydrogel was synthesized by Free Radical polymerization and characterized by means of FTIR. The FTIR results show that the carboxylic groups in the complexes coordinated to the metal ions in the form of two dentate. The effects of contact time, solid/liquid ratio, pH value, and initial concentration on the adsorption of UO2 2+ ions onto polyacrylic acid were investigated. The adsorption of UO2 2+ ions was highly dependent on the initial pH of metal ions solution and initial metal ions concentration. The adsorption kinetic data indicated that the chemical adsorption was the swiftness processes, the adsorption equilibrium could be achieved within 15 min. And there are very good correlation coefficients of linearized equations for Freundlich model, which indicated that the sorption isotherm of the hydrogel for UO2 2+ can be fitted to the Freundlich model. It was found that the maximum adsorption quantity of UO2 2+ was 1,179 mg/g. After five times of repeated tests for the hydrogel it still remained its excellent adsorption.
- Published
- 2012
8. Adsorption of UO2 2+ from aqueous solution onto copolymers of styrene and maleic anhydride
- Author
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Liu Tonghuan, Yang Ying, Wu Wangsuo, and Duan Guojian
- Subjects
Aqueous solution ,Chemistry ,Health, Toxicology and Mutagenesis ,Radical polymerization ,Inorganic chemistry ,Public Health, Environmental and Occupational Health ,Langmuir adsorption model ,Maleic anhydride ,Pollution ,Analytical Chemistry ,Styrene ,symbols.namesake ,chemistry.chemical_compound ,Adsorption ,Nuclear Energy and Engineering ,Polymer chemistry ,symbols ,Copolymer ,Radiology, Nuclear Medicine and imaging ,Carboxylate ,Spectroscopy - Abstract
The copolymers of styrene and maleic anhydride resin (PSt/MA) was synthesized by free radical polymerization and characterized by means of FTIR. It is shown that the PSt/MA copolymer has rather strong coordination ability to UO2 2+ ions by chelation with the carboxylate group, and the microstructures of the U(VI)-PSt/MA complexes can be well controlled. The influence factors on UO2 2+ ions were also investigated and described in detail, such as contact time, solid/liquid ratio, pH value, ethanol content, and initial concentration. It was found that the maximum adsorption quantity of UO2 2+ was 831 mg/g. Experiments show that PSt/MA can recover UO2 2+ ions with high adsorption selectively from a simulated industry solution containing Ca2+ and Mg2+ as impurities. The adsorption kinetic data were best described by the pseudo-second-order equation, indicating that the chemical adsorption was the rate-limiting step. And there are very good correlation coefficients of linearized equations for Langmuir model, which indicated that the sorption isotherm of the PSt/MA for UO2 2+ can be fitted to the Langmuir model. After five times of repeated tests for the hydrogel it still remained its excellent adsorption.
- Published
- 2012
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