Enhanced removal of Pb(II) and organics by titanate in a designed simultaneous process

Bi, Jingtao; Wang, Jingkang; Huang, Xin; Tao, Qingqing; Miao, Chen; Wang, Ting; Hao, Hongxun

doi:10.1016/j.seppur.2020.117339

Cited by 11 publications

(7 citation statements)

References 47 publications

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“…A sodium titanate nanorod with diameter of 185 nm (Figure A) was selected as the model material. After immersing into a 0.1 mM Pb(II) solution for 24 h, the obtained nanorod was analyzed by energy-dispersive X-ray spectroscopy (EDS) elemental mapping (Na + ), the image of which is shown in Figure B . It is clear that the light intensity of the sodium content is the highest at the center of the nanorod and sharply declines outward along the radius, which is indicative of the ion-exchanging process occurring at the edge of the rod and thus a concentrated profile of sodium near the interface.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the sodium percentages of the four samples were determined by X-ray photoelectron spectroscopy (XPS) spectra to be 5.18, 8.35, 11.39, and 10.60% (molar ratio), respectively, as illustrated in section S1.1. The applicability of the constructed models was also investigated by fitting Pb(II), U(VI), and As(III) surface adsorption–immobilization process data and methylene blue photocatalytic degradation–ion exchange kinetics and by simulating elemental mapping images of titanate nanorods …”

Section: Methodsmentioning

confidence: 99%

“…The applicability of the constructed models was also investigated by fitting Pb(II), 24 U(VI), 25 and As(III) surface adsorption−immobilization process data 26 and methylene blue photocatalytic degradation−ion exchange kinetics 27 and by simulating elemental mapping images of titanate nanorods. 28…”

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confidence: 96%

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Modeling of Mixed Mechanism Adsorption Processes Driven by Surface Adsorption and Internal Ion Exchange

Wang

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et al. 2020

Ind. Eng. Chem. Res.

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In this work, a number of kinetic models describing adsorption processes that occur via a mixed mechanism of both simultaneous surface adsorption and internal ion exchange were developed. The proposed models exhibit higher R 2 values in fitting experimental results, for such systems compared to extensively used single-factor kinetic models. Among the simulated parameters within these models, the ion exchange rate coefficient (I R ) in adsorbent-based models and the reaction order (n) in adsorbatebased models were identified as key factors to analyze the combined adsorption processes, which may enable the rational design or selection of adsorbate materials. Furthermore, the constructed models were also successfully applied to other processes with mixed mechanisms, including photochemical surface adsorption−immobilization and photocatalytic degradation− ion exchange, where the positive I R values and reaction order (n) values larger than unity were considered as important evidence for the coexistences and contributions of submechanisms. Finally, the obtained concentration profiles in the adsorbent were compared to energy-dispersive X-ray spectroscopy mapping images, which further confirm the accuracy and applicability of the proposed models, providing measurements for quantities such as the diffusion coefficient, equilibrium ion concentration, and depth of the "ion exchange plane".

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Modeling of Mixed Mechanism Adsorption Processes Driven by Surface Adsorption and Internal Ion Exchange

Wang

Ferguson

et al. 2020

Ind. Eng. Chem. Res.

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“…Subsequently, they systematically studied the photocatalytic removal of Pb (II) on the titanate photocatalysts with different amounts of intercalated Pb (II). Enhanced photocatalytic Pb(II) removal performance of 0.10 mM Pb-Titanate was attributed to a large specific surface area, a higher adsorption affinity, and a superior number of photogenerated carriers [ 60 ].…”

Section: Removal Of Heavy Metalsmentioning

confidence: 99%

Recent Advances of Photocatalytic Application in Water Treatment: A Review

et al. 2021

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Photocatalysis holds great promise as an efficient and sustainable oxidation technology for application in wastewater treatment. Rapid progress developing novel materials has propelled photocatalysis to the forefront of sustainable wastewater treatments. This review presents the latest progress on applications of photocatalytic wastewater treatment. Our focus is on strategies for improving performance. Challenges and outlooks in this promising field are also discussed. We hope this review will help researchers design low-cost and high-efficiency photocatalysts for water treatment.

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“…However, these methods are relatively expensive and often inefficient when working at low concentrations. The method of photocatalysis using semiconductor material has the potential to reduce harmful pollutants and is also effective when working at low concentrations of Cr [5] and Pb [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Titanium Dioxide/Silicon Dioxide from Beach Sand as Photocatalyst for Cr and Pb Remediation

et al. 2020

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Heavy metals are non-biodegradable and have a high toxicity effect on microorganisms which makes their presence in the environment extremely dangerous. The method of handling heavy metal waste by photocatalysis techniques using TiO2/SiO2 composite showed a good performance in reducing harmful pollutants. In this study, SiO2 from Bengkulu beach sand, Indonesia, was used as a support material for TiO2 photocatalyst to remove Cr(VI) and Pb(II). SiO2 was obtained through leaching techniques using NaOH as a solvent. The TiO2/SiO2 composite photocatalyst was synthesized using a solvothermal method at 130 °C and then characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and a particle size analyzer (PSA). Based on the XRD diffractogram, the synthesized TiO2 showed the anatase structure while the SiO2 showed the amorphous structure. The Ti–O–Si bond is defined in the infrared (IR) spectra, which indicates that the relationship between TiO2 and SiO2 is a chemical interaction. The results of SEM and PSA characterizations show agglomerated spherical (round) particles with a mean particle size of 616.9 nm. The TiO2/SiO2 composite of 7:1 ratio showed the highest photocatalytic activity after 180 min of ultraviolet (UV) irradiation, with a concentration-decrease percentage of 93.77% and 93.55% for Cr(VI) and Pb(II), respectively.

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Enhanced removal of Pb(II) and organics by titanate in a designed simultaneous process

Cited by 11 publications

References 47 publications

Modeling of Mixed Mechanism Adsorption Processes Driven by Surface Adsorption and Internal Ion Exchange

Modeling of Mixed Mechanism Adsorption Processes Driven by Surface Adsorption and Internal Ion Exchange

Recent Advances of Photocatalytic Application in Water Treatment: A Review

Synthesis of Titanium Dioxide/Silicon Dioxide from Beach Sand as Photocatalyst for Cr and Pb Remediation

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