The effect of pH on the U(VI) sorption on graphene oxide (GO): A theoretical study

Ai, Yuejie; Liu, Yang; Lan, WanYing; Jin, Jian; Xing, Jinlu; Zou, Yidong; Zhao, Chaofeng; Wang, Xiangke

doi:10.1016/j.cej.2018.03.027

Cited by 146 publications

(41 citation statements)

References 33 publications

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“…Many adsorbents suffer upon exposure to acidic and alkaline solutions (i.e., pH) when used in actual environmental systems. High or low pH values commonly destabilize adsorbents, destroy interfacial adsorption, and reduce adsorption efficiency . To investigate this, absorption experiments with S/C‐TiO 2 ‐0.5 were carried out at different pH ranges between 4 and 7.…”

Section: Resultsmentioning

confidence: 99%

Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Zou

Shang

Wang

et al. 2019

CLEAN Soil Air Water

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Highly toxic divalent cadmium causes serious environmental issues. To quickly monitor and/or efficiently remove this potentially toxic metal ion as well as to explore its interfacial chemistry with metal oxides, a sulfur and carbon co-doped titania (S/C-TiO 2 ) composite is synthesized via a facile sol-gel method with the assistance of sodium lignosulphonate (SLS). The prepared composite displays a well-crystallized TiO 2 nanostructure comprising the anatase phase. Both S and C, which are derived from the SLS template, are found to enter the TiO 2 lattice. The S/C-TiO 2 composite exhibits a porous structure with a wide pore size distribution. The newly synthesized composite shows adsorption capability for the potentially toxic metal Cd(II). The adsorption process requires <5 min to reach equilibrium. The measured equilibrium adsorption capacity is 19.42 mg g −1 , which is twice as high as that of bare TiO 2 . The removal efficiency is as high as 97%. Moreover, the materials are suitable for contaminated solutions over a wide range of pH values and various initial cadmium concentrations. A mechanism for the enhanced adsorption behavior is also proposed.

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Section: Resultsmentioning

confidence: 99%

Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Zou

Shang

Wang

et al. 2019

CLEAN Soil Air Water

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“…They had observed less absorption efficiency for metal cations in low pHs because of the competition between H + and positively metal ions; Conversely, at high pHs, the adsorbent was deprotonated and was more likely to absorb cationic metals. Ai et al [59] have reported that the sorption of U(VI) towards graphene oxide was primarily influenced by the pH values of the aqueous solution, and its adsorption performance was strongest at high pH levels. The adsorption mechanism was strong electrostatic interaction between the uranyl ion and the negative charged O atoms of the oxygencontaining functional groups, which were the main adsorption sites also.…”

Section: Effect Of Contact Timementioning

confidence: 99%

Synthesis of TiO2/nZVI nanocomposite for nitrate removal from aqueous solution

Hejri

Omidvar

et al. 2019

Int J Ind Chem

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To develop a new adsorbent for removal of nitrate and to enhance the adsorbent separation from aqueous solution, surface modification of titanium dioxide nanoparticles with nano-zero-valent iron (nZVI) was performed through chemical coprecipitation of magnetic nanoparticles on TiO 2 surface. Morphological, structural and magnetic properties of modified adsorbents (TiO 2 /nZVI) were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared radiation (FTIR) and vibrating sample magnetometer (VSM). To determine the ionic strength effect and optimal removal conditions, the effect of contact time (60-210 min), pH (4-10) and adsorbent dosage (0.5-1.5 g/L) on adsorption efficiency were studied, using response surface method. Obtained results showed that the nitrate removal efficiency decreased with increasing ionic strength. The TiO 2 /nZVI nanocomposites exhibited a ferromagnetic behavior and its saturation magnetization was 795.28 memu/g. The maximum nitrate removal (98.226%) achieved by modified TiO 2 was about 14.65% higher than the unmodified nanoparticles. The optimized adsorption parameters were: adsorbent dosage 0.982 g/L, pH 4.185 and the contact time 150.091 min.

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“…为了提高计算效率并且保证计算精度, 我们选用了10碳环的石墨烯片段作为石墨烯的计算模型 [20,33,34] , . 所有的结构弛豫及能量计算都基于密度泛函理论, 在Gaussian09软件包 [41] 下进行, 交换相关泛函使…”

Section: 计算模型和方法unclassified

Theoretical study on the removal of uranyl by nitrogen, phosphorus and sulfur doped graphene materials

Liu¹,

Zhao²,

Zhang³

et al. 2018

Sci. Sin.-Chim

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The effect of pH on the U(VI) sorption on graphene oxide (GO): A theoretical study

Cited by 146 publications

References 33 publications

Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Synthesis of TiO2/nZVI nanocomposite for nitrate removal from aqueous solution

Theoretical study on the removal of uranyl by nitrogen, phosphorus and sulfur doped graphene materials

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The effect of pH on the U(VI) sorption on graphene oxide (GO): A theoretical study

Cited by 146 publications

References 33 publications

Sulfur and Carbon Co‐doped TiO2 Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Sulfur and Carbon Co‐doped TiO2 Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Synthesis of TiO2/nZVI nanocomposite for nitrate removal from aqueous solution

Theoretical study on the removal of uranyl by nitrogen, phosphorus and sulfur doped graphene materials

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Product

Resources

About

Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium

Sulfur and Carbon Co‐doped TiO₂ Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium