Search results for: Changlun Chen

Items from 1 to 20 out of 85 results

article

An Efficient Bioaggregate Reactor for Enhanced Denitrification of Sewage with Low Carbon/Nitrogen Ratio

Changlun Chen, Amjad Ali, Junfeng Su, Jing Gao

Chemical Engineering & Technology > 44 > 9 > 1631 - 1640

This study developed a bioaggregate reactor by using Pseudomonas strain GF2. The response surface method indicated that the optimal parameters were pH 7, a hydraulic retention time (HRT) of 6 h, and an initial nitrate concentration of 25 mg L⁻¹. Nitrate removal reached a maximum of 99.19 % at a C/N ratio of 2. Gas chromatographic detection revealed that nitrogen gas was the main product (98.46 %)...

article

Synthesis of novel nanomaterials and their application in efficient removal of radionuclides

Xiangxue Wang, Long Chen, Lin Wang, Qiaohui Fan, more

Science China Chemistry > 2019 > 62 > 8 > 933-967

With the development of nuclear energy, large amounts of radionuclides are inevitably released into the natural environment. It is necessary to eliminate radionuclides from wastewater for the protection of environment. Nanomaterials have been considered as the potential candidates for the effective and selective removal of radionuclides from aqueous solutions under complicated conditions because of...

article

Investigation of the adsorption mechanisms of Pb(II) and 1-naphthol by β-cyclodextrin modified graphene oxide nanosheets from aqueous solution

Huiling Zheng, Yang Gao, Kairuo Zhu, Qi Wang, more

Journal of Colloid and Interface Science > 2018 > 530 > C > 154-162

β-cyclodextrin decorated graphene oxides (β-CD-GO) was prepared by using an in-situ aggregation treatment, and used to remove inorganic (Pb(II)) and organic pollutants (1-naphthol) from water environment. The batch adsorption experiments of as-prepared β-CD-GO were carried out as a function of pH values, initial Pb(II) and 1-naphthol concentration, ionic strength, contact time and temperature. β-CD-GO...

article

In situ carbothermal reduction synthesis of Fe nanocrystals embedded into N-doped carbon nanospheres for highly efficient U(VI) adsorption and reduction

Kairuo Zhu, Changlun Chen, Mingwenchan Xu, Ke Chen, more

Chemical Engineering Journal > 2018 > 331 > C > 395-405

In this work, magnetic porous nitrogen doped carbon structures containing well-dispersed active Fe nanocrystals (Fe/N-C) are fabricated conveniently via Fe³⁺-mediated polymerization of dopamine as precursor combined with in situ post carbonization process, thus allowing the entire encapsulation of active Fe nanocrystals in the interior. The obtained functional hybrid materials at 700°C (Fe/N-C-700)...

article

EDTA functionalized Fe3O4/graphene oxide for efficient removal of U(VI) from aqueous solutions

Donglin Zhao, Qi Zhang, Han Xuan, Yan Chen, more

Journal of Colloid and Interface Science > 2017 > 506 > C > 300-307

In this study, a regenerable magnetic ligand material (EDTA-mGO) was fabricated by binding chelating groups (EDTA) onto Fe₃O₄/graphene oxide and applied to remove U(VI) from aqueous solution. The sorption experiments were investigated under different experimental conditions, such as temperature, contact time and pH. EDTA-mGO showed fast removal capacity for U(VI) (<1.5h) with high sorption ability...

article

Investigation of U(VI) sorption on silica aerogels: Effects of specific surface area, pH and coexistent electrolyte ions

Ge Liu, Huiyang Mei, Hongshan Zhu, Ming Fang, more

Journal of Molecular Liquids > 2017 > 246 > C > 140-148

The very large surface associated with aerogels made them attractive in the field of sorption. Herein, silica aerogels were characterized and used for the sorption of U(VI) in solution. The effects of specific surface area (SSA), pH and coexistent electrolyte ions on the surface site density, aggregation and sorption properties have been carefully investigated. The site distributions of silica aerogels...

article

Insights into key factors controlling GO stability in natural surface waters

Yang Gao, Xuemei Ren, Xiaoli Tan, Tasawar Hayat, more

Journal of Hazardous Materials > 2017 > 335 > C > 56-65

The effects of pH, cations (Na⁺, K⁺, Mg²⁺, Ca²⁺ and Al³⁺), and anions (Cl⁻, HCO₃⁻, HPO₄²⁻ and SO₄²⁻) on graphene oxide (GO) stability were investigated to address the current limitations in the knowledge regarding the stability of GO in natural surface water and its underlying mechanism. The threshold values of cations that destabilize GO were obtained and affected by both pH and anions. By employing...

article

Bonding properties of humic acid with attapulgite and its influence on U(VI) sorption

Liqiang Tan, Xiangxue Wang, Xiaoli Tan, Huiyang Mei, more

Chemical Geology > 2017 > 464 > C > 91-100

Humic acid (HA) can markedly change the surface charge of clay minerals and influences the sorption of uranium(U) on clay minerals in aquatic environments. Furthermore, HA can potentially affect the mobility of U(VI) in the natural environment. The effect of HA on the surface charge, aggregation, sorption and bonding properties of attapulgite [(Mg,Al)₄(Si)₈(O,OH,H₂O)₂₆·nH₂O] was investigated using...

article

Mechanical, electronic and thermodynamic properties of hexagonal and orthorhombic U2Mo: A first-principle calculation

Ke Chen, Xiaofeng Tian, You Yu, Zhenjiang You, more

Progress in Nuclear Energy > 2017 > 99 > C > 110-118

First-principle investigations are presented based on density functional approach to calculate the elastic properties, stress-strain relations, phonon dispersion relations, electronic properties and thermodynamic properties of hexagonal and orthorhombic U₂Mo. The calculated energies in the present work suggest that hexagonal structure is more stable than orthorhombic one. The obtained elastic constants...

article

Characterization of the sorption behavior and mechanism of U(VI) on sericite by batch experiments and spectroscopic techniques

Ge Liu, Huiyang Mei, Huifang Zhang, Haining Liu, more

Journal of Radioanalytical and Nuclear Chemistry > 2017 > 313 > 2 > 333-342

This study explored the sorption behavior and mechanism of U(VI) on sericite. The surface properties of sericite were investigated, and the effects of several environmental factors on U(VI) sorption to sericite were evaluated. The experimental data were simulated by different isotherm models and kinetic models. Humic acids affects U(VI) sorption obviously while silicate promotes the process in the...

article

Adsorption of Europium on Al-substituted goethite

Mengxue Li, Haibo Liu, Tianhu Chen, Tasawar Hayat, more

Journal of Molecular Liquids > 2017 > 236 > C > 445-451

Europium (Eu(III)) has been extensively used as an analogue of trivalent lanthanide in the radioactive wastewater from nuclear industry. The adsorption of Eu(III) on the Al-substituted goethite was investigated by characteristic and batch techniques. The characteristic results illustrated that the Al-substituted goethite was synthesized successfully and the acicular-like structure goethite was transformed...

article

The influence of dissolved Si on Ni precipitate formation at the kaolinite water interface: Kinetics, DRS and EXAFS analysis

Xiaoli Tan, Ge Liu, Huiyang Mei, Ming Fang, more

Chemosphere > 2017 > 173 > C > 135-142

Unraveling the formation process of Ni precipitates at molecular scale is important for understanding the fate and mobility of Ni species in the real environment. Dissolved Si presents in the natural environment ubiquitously, which can alter Ni sorption as well as incorporation into neoformed precipitates. Batch experiments show that the dissolved Si leads to a rapid increase in the Ni sorption rate...

article

Efficient sorption and reduction of U(VI) on zero-valent iron-polyaniline-graphene aerogel ternary composite

Lili Chen, Shaojie Feng, Donglin Zhao, Shaohua Chen, more

Journal of Colloid and Interface Science > 2017 > 490 > C > 197-206

In this work, zero-valent iron-polyaniline-graphene aerogel composite (Fe-PANI-GA) was prepared and applied in the removal of U(VI) from aqueous solutions by batch sorption experiments. The experimental results showed that the Fe-PANI-GA composite had an excellent removal capacity for the removal of U(VI) in acidic solutions. The results also showed that the maximum removal capacity of the Fe-PANI-GA...

article

Spectroscopic and modeling investigation of efficient removal of U(VI) on a novel magnesium silicate/diatomite

Songhua Lu, Jiansheng Hu, Changlun Chen, Xiaojun Chen, more

Separation and Purification Technology > 2017 > 174 > C > 425-431

A novel magnesium silicate/diatomite sorbent (MSD) was fabricated using a facile hydrothermal method. The interaction mechanism of U(VI) on MSD was investigated by batch, spectroscopic and modeling techniques. The maximum adsorption capacity of MSD for U(VI) (31.54mg/g) is significantly higher than that of diatomite (12.74mg/g). XPS analysis indicated that the oxygen-containing groups (e.g., SiOH)...

article

Fabrication of hierarchical core-shell polydopamine@MgAl-LDHs composites for the efficient enrichment of radionuclides

Kairuo Zhu, Songhua Lu, Yang Gao, Rui Zhang, more

Applied Surface Science > 2017 > 396 > C > 1726-1735

Novel hierarchical core/shell structured polydopamine@MgAl-layered double hydroxides (PDA@MgAl-LDHs) composites involving MgAl-layered double hydroxide shells and PDA cores were fabricated thought one-pot coprecipitation assembly and methodically characterized by X-ray diffraction, Fourier transformed infrared spectroscopy, scanning/transmission electron microscopy, selected area electron diffraction,...

article

Interaction of sulfonated graphene oxide with U(VI) studied by spectroscopic analysis and theoretical calculations

Yubing Sun, Xiangxue Wang, Yuejie Ai, Zhimin Yu, more

Chemical Engineering Journal > 2017 > 310 > P1 > 292-299

The interaction mechanism of high effective enrichment of U(VI) on sulfonated graphene oxide (GO) at ultralow pH still remains unclear. The batch characteristic results showed that sulfonated GO presented a variety of functional groups such as hydroxyl (OH), carboxyl (COOH) and sulfonyl (OSO₃H) groups. The macroscopic results indicated that the sorption of U(VI) on sulfonated GO was independent of...

article

Fabrication of sodium titanate nanospheres as efficient sorbent for the removal of U(VI) from aqueous solution

Songhua Lu, Hongjie Zhu, Huiyi Gao, Yuedong Meng, more

Journal of Molecular Liquids > 2017 > 225 > C > 101-106

The flower-like sodium titanate nanospheres (Na-TNS) were synthesized by the facile and hydrothermal method. The effect of environmental factors on the sorption of U(VI) on as-prepared Na-TNS was conducted by batch techniques. The maximum sorption capacity of Na-TNS for U(VI) fitted by Langmuir model was 189.34mg/g at pH5.0 and T=298K. It was determined from recycle experiment that Na-TNS was a reusable...

article

Effect of silicate on the sorption properties of kaolinite: removal of U(VI) and mechanism

Huiyang Mei, Yuedong Meng, Yu Gong, Xiaojun Chen, more

Journal of Radioanalytical and Nuclear Chemistry > 2017 > 311 > 3 > 1899-1907

The surface and sorption properties of kaolinite were analyzed as a function of silicate. Batch experiments indicate that the U(VI) sorption is promoted by the addition of silicate at low pH while is depressed at high pH. The sorption was acceptably predicted by the formation of a ternary silicate surface complex under the experimental conditions. The pseudo-second order kinetic model fit the sorption...

article

Facile preparation of amino functionalized graphene oxide decorated with Fe3O4 nanoparticles for the adsorption of Cr(VI)

Donglin Zhao, Xuan Gao, Changnian Wu, Rong Xie, more

Applied Surface Science > 2016 > 384 > C > 1-9

A novel ternary magnetic composite consisting of graphene oxide (GO), diethylenetriamine and Fe₃O₄ nanoparticles (AMGO) were synthesized by a facile one-step reaction route and characterized. The AMGO was applied as a magnetic adsorbent for the Cr(VI) removal from aqueous solutions and the magnetic separation process only took 40s. The maximum adsorption capacity of the AMGO for Cr(VI) was 123.4mg/g,...

article

Polyaniline-modified 3D-flower-like molybdenum disulfide composite for efficient adsorption/photocatalytic reduction of Cr(VI)

Yang Gao, Changlun Chen, Xiaoli Tan, Huan Xu, more

Journal of Colloid and Interface Science > 2016 > 476 > C > 62-70

Polyaniline (PANI) was modified onto 3D flower-like molybdenum disulfide (MoS₂) to prepare a novel organic–inorganic hybrid material, PANI@MoS₂. PANI@MoS₂ was characterized by scanning and transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction and thermogravimetric analysis. The results indicate that PANI was modified onto MoS₂. PANI@MoS₂ was applied as an adsorbent...

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INFONA - science communication portal

Search results for: Changlun Chen

An Efficient Bioaggregate Reactor for Enhanced Denitrification of Sewage with Low Carbon/Nitrogen Ratio

Synthesis of novel nanomaterials and their application in efficient removal of radionuclides

Investigation of the adsorption mechanisms of Pb(II) and 1-naphthol by β-cyclodextrin modified graphene oxide nanosheets from aqueous solution

In situ carbothermal reduction synthesis of Fe nanocrystals embedded into N-doped carbon nanospheres for highly efficient U(VI) adsorption and reduction

EDTA functionalized Fe3O4/graphene oxide for efficient removal of U(VI) from aqueous solutions

Investigation of U(VI) sorption on silica aerogels: Effects of specific surface area, pH and coexistent electrolyte ions

Insights into key factors controlling GO stability in natural surface waters

Bonding properties of humic acid with attapulgite and its influence on U(VI) sorption

Mechanical, electronic and thermodynamic properties of hexagonal and orthorhombic U2Mo: A first-principle calculation

Characterization of the sorption behavior and mechanism of U(VI) on sericite by batch experiments and spectroscopic techniques

Adsorption of Europium on Al-substituted goethite

The influence of dissolved Si on Ni precipitate formation at the kaolinite water interface: Kinetics, DRS and EXAFS analysis

Efficient sorption and reduction of U(VI) on zero-valent iron-polyaniline-graphene aerogel ternary composite

Spectroscopic and modeling investigation of efficient removal of U(VI) on a novel magnesium silicate/diatomite

Fabrication of hierarchical core-shell polydopamine@MgAl-LDHs composites for the efficient enrichment of radionuclides

Interaction of sulfonated graphene oxide with U(VI) studied by spectroscopic analysis and theoretical calculations

Fabrication of sodium titanate nanospheres as efficient sorbent for the removal of U(VI) from aqueous solution

Effect of silicate on the sorption properties of kaolinite: removal of U(VI) and mechanism

Facile preparation of amino functionalized graphene oxide decorated with Fe3O4 nanoparticles for the adsorption of Cr(VI)

Polyaniline-modified 3D-flower-like molybdenum disulfide composite for efficient adsorption/photocatalytic reduction of Cr(VI)

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