Journal of Water Process Engineering
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2021
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IF 5.485
Heyun Yang,Xing Zheng,Dou Zhang,Gang Tang,Xiaoliang Li,Hua Wu,Wei Yan,Hegang Zhi
Seven typical adsorbents were adopted to remove phosphorus and dissolved organic matter (DOM), including humic acid (HA), protein and polysaccharides from simulated wastewater (SW) and secondary effluent (SE). The corresponding adsorption behavior and mechanism were explored in this work. Results showed that the ideal optimal dosage and reaction time of seven adsorbents were 2 g/L and 300 min respectively. Three adsorbents (PANI/TiO 2 , IRA4200Cl, and IRA900Cl) were selected for the subsequent wastewater treatment because of their excellent adsorption and regeneration performance. After 10 cycles of adsorption-desorption process, the removal rates of TP and DOM could reach more than 80% for both SW and SE. The adsorption behavior on synthetic wastewater was well described by the pseudo-second-order model and Freundlich model, which meant that the adsorption of pollutants by these three adsorbents was ascribed to chemical and homogeneous adsorption. Moreover, it was found that the three selected adsorbents could selectively adsorb pollutants from wastewater through chemical adsorption , π-π stacking, hydrogen bonding and ion selectivity . All these findings revealed that the potential application of PANI/TiO 2 , IRA4200Cl, and IRA900Cl in the removal of phosphorus and DOM from SE due to their excellent thermal stability, excellent adsorption performance, and regeneration capability, among which PANI/TiO 2 exhibited the most outstanding performance among them, especially in terms of regeneration capacity.
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JOURNAL OF NANOPARTICLE RESEARCH
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2021
·Vol. 23
·期 8
·1-12
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IF 2.253
Tan Liqiang,Liu Zhengjie,Zhou Chuyun,Ding Lu
The environmental behavior and ultimate fate of the engineered nanoparticles could inevitably be affected by the widespread dissolved organic matter and sunlight irradiation in the natural environment. In this study, an analysis combined with experimental investigations was used to explore the influence of humic acid (HA) and UV irradiation on the changes in surface charge and aggregation behavior of TiO 2 nanoparticles. A prolonged UV irradiation caused the point of zero charge (PZC) of TiO 2 nanoparticles shifted to lower values and the aggregate size reached to a maximum value at the PZC. TEM image and FT-IR spectroscopy analysis confirmed the formation of TiO 2 cluster aggregates and successive growth of the hydroxyl groups on different sites on TiO 2 surface, respectively, although no effect of irradiation on the phase transformation of TiO 2 nanoparticles was observed through the use of Raman spectroscopy. The fluorescence spectroscopy analysis illustrated the interactions between the surface hydroxyls formed during UV irradiation on TiO 2 surface and functional groups on HA molecules, which accelerated the aggregation process of TiO 2 nanoparticles. Widespread HA and UV irradiation in the natural environment significantly altered the surface properties and stability of the nanoparticles in aqueous environments. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 18
·22910-22920
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IF 2.478
Zhao Yuan,Zhang Mengqi,Wang Wei,Song Wenli,Jiang Kanrui,Zhang Xiaojuan
Ti 3+ /N-co-doped TiO 2 was successfully synthesized in situ by one-step hydrothermal method using tetrabutyl titanate (TBOT) as the titanium source and hydrazine hydrate as the reducing agent and nitrogen source. Afterward, the microstructure and physicochemical properties of the catalysts were characterized by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy. Results indicated that nitrogen was effectively doped into the lattice of TiO 2 and Ti 3+ was stably presented in the prepared TiO 2 , which reduced the band-gap TiO 2 (2.96–2.75 eV) and enhanced photo-induced charge separation efficiency under visible light. In addition, the photocatalytic activity was evaluated by degradation of rhodamine B under xenon lamp with 420 nm filter. With the amount of hydrazine hydrate increased, the photocatalytic degradation performance of the sample increased first and then decreased. When the volume ratio of hydrazine hydrate to TBOT was 1:5, the sample showed the best photocatalytic performance.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Bing Wang,Carlota Bozal-Ginesta,RuiQing Zhang,Bo Zhou,HaiXia Ma,LinYu Jiao,Long Xu,EnZhou Liu,Chen Wang,Zhuo Li
The development of stable, efficient molecular-inorganic photocatalysts for organic pollutants degradation in wastewater remains a major challenge. Herein, a novel axially substituted supramolecular nanocrystalline subphthalocyanine H 12 SubPcB–OPhCOPh (SubPc-4) was successfully synthesized. By self-assembling supramolecular SubPc-4 on TiO 2 via dimeric concave-ligand π-interaction, an molecular-inorganic Z -scheme photocatalytic system (SubPc-4/TiO 2 ) was prepared exhibiting high photoactivity and stability towards the degradation of tetracycline (TC), methyl orange (MO) and bromophenol blue (BB). The photocatalytic degradation efficiency of TC, MO and BB with SubPc-4/TiO 2 was 96.2 %, 98.0 % and 100 % within 180 min, approximately 3.2, 19.7 and 6.6 times larger than pristine TiO 2 , respectively. The constructed SubPc-4/TiO 2 hybrid kept 88.5 % of its original photocatalytic activity toward TC after five photocatalytic cycles with respect to the first cycle, while bare TiO 2 only kept 23.2 %. We reveal that this high photoactivity and photostability arises from the formation of an effective charge separation Z -scheme. This work demonstrates the potential of the SubPc-4/TiO 2 molecular-inorganic Z -scheme photocatalyst in wastewater treatment.
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ACS Applied Nano Materials
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2021
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IF 5.097
Yuxian Su,Li Liu,Shipeng Wen
Semiconductor photocatalysis is a promising strategy for wastewater treatment. However, a limited photoresponse range, rapid recombination of photoinduced charge carriers, poor stability, and other problems have posed obstacles to practical applications. Herein, a facile strategy to fabricate a near-infrared-driven broadband photocatalyst was developed by anchoring the core–shell nanostructure of NaYF4:Yb,Tm@NaYF4:Yb,Nd@TiO2 (Tm@Nd@TiO2) onto the surface of porous silica/carbon (mSC) electrospun fibers. The Tm@Nd@TiO2 nanoparticles (NPs) exhibited strong near-infrared light absorption and energy transfer from the NaYF4:Yb,Tm@NaYF4:Yb,Nd core to the TiO2 shell, triggering the photocatalytic reaction. In addition, the interconnected mesoporous structure and carbon network of Tm@Nd@TiO2/mSC was found to be beneficial in improving the adsorption capacity toward organic pollutants, promoting the separation of photogenerated carriers, and further improving the overall photocatalytic performance. The photocatalytic activity of Tm@Nd@TiO2/mSC nanocomposite was evaluated by degrading methyl orange solution in the visible-near-infrared and simulated sunlight regions. The Tm@Nd@TiO2/mSC nanocomposite exhibited excellent adsorption performance. The photocatalytic activity of Tm@Nd@TiO2/mSC was found to be 3 times higher than that of bare Tm@Nd@TiO2 over 60 min.
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CERAMICS INTERNATIONAL
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2020
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IF 3.83
Lianying Lu,Guohong Wang,Ziwei Xiong,Zifei Hu,Yuwei Liao,Juan Wang,Jun Li
A heterojunction of plasmonic Ag particles on Ti 3+ -doped macro-/meso-porous TiO 2 framework consisting of parallel microchannels, denoted as Ag/TiO 2- x , has been fabricated by a simple microwave-assisted process employing vitamin C as the reducing agent for forming TiO 2- x framework followed by photochemical deposition of Ag particles. Charge transport and recombination processes were detected through transient photocurrent responses. The visible-light photocatalytic hydrogen production rate and the apparent reaction rate constant of RhB photodegradation with 3%-Ag/TiO 2- x catalyst are about 5.3 and 14.0 fold higher than those with the pristine macro-/meso-porous TiO 2 framework, respectively. A mechanism based on the synergistic effects of Ag plasmonics and Ti 3+ -doping at the Ag/TiO 2- x heterojunction is proposed, which consistently explains the high photocatalytic performance in hydrogen evolution and the improved photocatalytic decomposition of RhB under visible light. This study demonstrates the effective route to synthesize new heterojunction photocatalytic materials with multifunctional properties using low-cost and rapid microwave processes.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Jiarou Wang,Xiaofang Wang,Song Zhao,Bin Sun,Zhi Wang,Jixiao Wang
Oil spill events are major factor of marine ecological system pollution, which cause serious harms to the environment and humanity. Fabrication of an efficient material for oil/water separation is a feasible solution to these thorny problems. In this work, stainless steel meshes were modified with polyaniline (PANI) and TiO 2 nanoclusters through a facile dip-coating method to endow mesh surface with superhydrophobic property with static water contact angle above 150°. Oil/water separation performance was comprehensively evaluated, and the results demonstrated that PANI/TiO 2 modified meshes could efficiently and effectively separate a series of oil/water mixtures including hexane, decane, toluene and diesel oil with high fluxes ranging from 46 k L·m −2 ·h −1 to 176 k L·m −2 ·h −1 , and the oil purity in permeate remaining above 99.8% even after 100 cycles separation. Moreover, the as-prepared PANI/TiO 2 modified meshes were capable to degrade oil or organic contaminants on the mesh surfaces under visible light. Furthermore, PANI/TiO 2 modified meshes designed in this work exhibited dramatic performance in self-cleaning, abrasive resistance and anti-corrosion, and therefore showing great potential and prospect in industrial practical application.
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JOURNAL OF CATALYSIS
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2019
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IF 7.723
Jinjin Lin,Tao Sun,Minbo Li,Jinxiang Yang,Jinni Shen,Zizhong Zhang,Ying Wang,Xiaoyan Zhang,Xuxu Wang
Loading noble metal on the surface has been widely used to improve photocatalytic activity of semiconductor photocatalyst. Here, Pt-embedded anatase (A)-rutile (R) TiO 2 junction photocatalyst (A/Pt/R) was found to show much more efficient photocatalytic H 2 evolution activity than the other TiO 2 photocatalysts loading Pt on the outside surface (such as Pt/A/R, Pt/A, Pt/R and Pt/P25), although the as-embedded Pt is unreachable to reactants. The A/Pt/R sample shows a photocatalytic H 2 evolution rate as high as 17.9 mmol⋅g cat −1 ⋅h −1 , which is 27.2 and 2.5 times higher than the common A/R and Pt/A/R samples, respectively. The traditional theory fails to explain the unexpected high photoactivity. The reverse tandem Schottky junction is suggested to be possibly responsible for the high photoactivity of A/Pt/R, which allows the photogenerated electrons to transfer more swimmingly from rutile to anatase than the common A/R phasejunction. This finding provides a new strategy for further promoting photocatalytic activity of Pt/TiO 2 and other heterophase or heterojunction photocatalysts.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Jingtao Bi,Xin Huang,Jingkang Wang,Ting Wang,Hao Wu,Jinyue Yang,Haijiao Lu,Hongxun Hao
In this work, to simultaneously remove organic dyes and Pb(II) from wastewater, a series of magnetic Fe 3 O 4 @C@TiO 2 -nanotube composites were designed and successfully synthesized via a new facile oil-phase cyclic magnetic adsorption (OCMA) method. The structural properties of the synthesized composites were investigated by different characterization methods systematically. It was found that Fe 3 O 4 was uniformly deposited on the inner walls of TiO 2 nanotubes. Although a Type III band alignment was formed in the catalysts, Fe 3 O 4 @C@TiO 2 -nanotube composites exhibited enhanced light absorbing ability and enlarged absorption edge due to efficient separation of h + and e − , which was verified by UV–Vis (Ultraviolet–visible) and PL (Photoluminescence) spectra. Decontamination experiments of 1FeCTi showed that more than 98% of RhB and about 92% of Pb(II) ions could be removed through adsorptive removal in the dark equilibrium period and further elimination during the illuminating period. The pseudo-first-order model, L-H model and adsorption-reaction model were established to describe the adsorption of Pb(II) in the dark, photodegradation of RhB and further elimination of Pb(II), respectively. A four-step mechanism was proposed to describe the decontamination process of Pb(II) during the illuminating period according to the final forms of Pb (Pb δ1 , Pb δ2 , Pb 0 and PbO). Finally, it was found that the photocatalytic activity would be maintained in the recycle experiments due to the existence of 1FeCTi@PbO heterostructure.
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Journal of Physical Chemistry C
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2019
·
IF 4.309
Xing Xu,Lei Lai,Jiahong Jiang,Zhiqiao He,Shuang Song
Nitrogen-doped carbon-wrapped C,N-codoped TiO2 (CN@C,N-TiO2) was successfully prepared using a facile and efficient method involving hydrolysis and calcination under Ar using tetrabutyl titanate and 2,6-diaminopyridine as the precursors. X-ray photoelectron spectroscopy (XPS) and valence band XPS measurements reveal the successful codoping of interstitial carbon and nitrogen into TiO2, which leads to a visible-light absorption of up to ∼550 nm in the UV–vis diffuse reflectance spectra. Raman spectra and high-resolution transmission electron microscopy results show that N-doped carbon exists on the surface of C,N-TiO2, which gives rise to the efficient separation of photoexcited charge carriers, as determined by photoluminescence and electrochemical impedance spectroscopy. Benefiting from the combined effects of a surface-coated N-doped carbon layer and C,N-codoping, the photocatalyst calcined at 450 °C exhibits remarkable visible-light activity toward the hydrogen evolution reaction in the water splitting process with a H2 production rate of 833.2 μmol h–1 g–1 under 94 mW cm–2 visible-light illumination (λ > 420 nm). Moreover, the representative CN@C,N-TiO2 sample can maintain its activity for at least 40 h.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Yifei Zhan,Jianwu Lan,Jiaojiao Shang,Lin Yang,Xinmei Guan,Wenxu Li,Siqi Chen,Ying Qi,Shaojian Lin
A ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat was successfully fabricated via stepwise in-situ growth method. The morphology and composition of the resultant ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat were confirmed by emission scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS) and electrochemical impedance spectroscopy (EIS), respectively. Next, methylene blue (MB) was employed as a contaminant to evaluate photocatalytic activity of prepared composite photocatalysts under visible light and natural sunlight irradiation. As expected, the ZIF-8/Ag/AgCl/TiO 2 decorated PAN nanofibrous mat exhibited high photocatalytic activity under both light sources, owing to the synergistic effect among ZIF-8, Ag/AgCl and TiO 2 . The degradation efficiency of the targeted PAN nanofibrous mat under visible light could reach to 98.02% within 120 min towards 20 mL of 50 mg/L MB aqueous solution. Most importantly, the fabricated ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat exhibited outstanding recyclability, the corresponding degradation efficiencies were up to 90.16% after five cycles and approximately 80% after ten cycles, respectively. Additionally, the resultant nanofibrous mat showed a long-term stability against acid and alkaline, and excellent antimicrobial performance against S. aureus and E. coli .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Fei Li,Bo Dong,Shenglei Feng
Photoelectrochemical (PEC) seawater splitting can relive the shortage of purified water feedstocks . However, the corrosion from seawater on the photoelectrode becomes an uncertain influence factor for PEC performance. Developing an efficient and stable photoelectrode is a challenge. Herein, we present a Bi–BiOI shell-core microspheres modified TiO 2 nanotube arrays (TNA) photoanode prepared via solvothermal method , affording superior PEC hydrogen evolution activity in simulated seawater under AM1.5G light, which is 3.8 and 7.6 times than those of BiOI/TNA and TNA, respectively. Solar-to-hydrogen conversion efficiency of Bi–BiOI/TNA reaches to 2.21% with Faradaic efficiency up to 85.7%. Based on the optical and PEC measurements, it is verified that surface plasmon resonance effect of metallic Bi promotes transfer and separation of photogenerated charge and enhances visible-light absorption, thus benefiting higher PEC performance. Especially, Bi shell efficiently hinders the corrosion of BiOI by seawater. Our work provides a novel paradigm of photoanode for efficient and stable PEC seawater splitting.
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