JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Wei Ding,Xinyuan Wan,Huaili Zheng,Yuyang Wu,Salam Muhammad
Owing to the lower toxicity and mobility of inorganic As(V), the oxidative removal of As(III) is deemed as the optimal approach for arsenic elimination from water. Herein, a synthetic TiO 2 -supported CuO material (Cu-TiO 2 ) was coupled with sulfite (S(IV)) to remove As(III) at neutral pH. The combined process coupled oxidation with adsorption (i.e., As(III) removal by Cu-TiO 2 /S(IV)) was superior than a divided preoxidation-adsorption process (i.e., As(V) removal by Cu-TiO 2 ) for arsenic removal. Attractively, low concentration of As(III) (50−300 μg L −1 ) could be completely removed by Cu-TiO 2 (0.25 g L −1 )/S(IV) (0.5 mM) within 60 min. Mechanism investigations revealed that the efficient As(III) removal was attributed to the continuous oxysulfur radicals (SO x •− ) oxidation and Cu-TiO 2 adsorption. The surface-adsorbed and free sulfate radicals (SO 4 •− ) were further identified as the crucial oxidizing species. The Cu-TiO 2 played the dual roles as a catalyst for S(IV) activation and an absorbent for arsenic immobility. The influence of operating parameters (i.e., As(III) concentration and sulfite dosage) and water chemistry (i.e., pH, inorganic anions, dissolved organic matters , and temperature) on As(III) removal were systematically investigated and optimized. Overall, the proposed process has potential application prospects in rehabilitating the As(III)-polluted water environment using industrial waste sulfite.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 16
·10160-10168
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IF 12.732
Zhongzhe Wei,Zijiang Zhao,Jing Wang,Qiang Zhou,Chenxia Zhao,Zihao Yao,Jianguo Wang
The limited reserves and sluggish H2O dissociation process of Pt necessitate the development of low-cost catalysts with enhanced catalytic performance in the alkaline hydrogen evolution reaction. Here, Ru nanoparticles supported on oxygen-deficient TiO2@carbon hybrids (Ru/TiO2-VO@C) were efficiently fabricated via one-pot carburization of RuCl3, TiO2(B) and melamine. The melamine additive assists the formation of oxygen vacancies (VO) and Ru0 and introduces a beneficial carbon dopant. Ru/TiO2-VO@C features a remarkably enhanced alkaline HER performance with an overpotential of only 64 mV to attain a current density of 10 mA cm−2. This satisfactory catalytic performance originates from the strong electronic interaction between Ru and TiO2-VO and the synergistic interplay between TiO2-VO and the carbon dopant. This synergistic cooperation improves the conductivity, promotes the dissociation of H2O and optimizes the hydrogen adsorption free energy. This study opens an avenue for the reasonable design of multi-component nanostructures and gives in-depth insights into the alkaline HER mechanism.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Liangzhong Li,Chang Liu,Ruixue Ma,Yunjiang Yu,Zhaofeng Chang,Xiaohui Zhang,Chenyu Yang,Da Chen,Yang Yu,Wei Li,Yongdi Liu
In this study, Fe 3 O 4 @TiO 2 decorated reduced graphene oxide (RGO) nanosheets were synthesized by loading iron oxide on the surface of RGO nanosheets and subsequently coating by titanium oxide, which can be employed as the persulfate (PS) activator and high-performance adsorbent toward thallium (Tl). PS could be effectively activated by the Fe 3 O 4 @TiO 2 decorated RGO nanosheets due to the presence of RGO and Fe(II), resulting in the rapid oxidation of Tl(I) to Tl(III). The removal of Tl(I) was found to be pH-dependent, with the removal efficiency of more than 88.5% in the pH range of 8.0–12.0 at the optimal PS dosage of 10 mM and material dosage of 0.2 g/L. The surface precipitation of Tl 2 O 3 and enhanced adsorption affinity toward Tl were deduced to be main mechanisms for the extremely efficient removal of Tl(I) ions during the oxidation and adsorption hybrid process. The maximum removal capacity of the material at pH 8.0 was estimated as 673.2 mg/g based on the fitting result from the Langmuir model. Approximately 94.7% of ultimate removal capacity could be accomplished within the first 10 min at the initial Tl concentration of 8.5 mg/L. The PS catalytic oxidation coupled with the adsorption technique using the prepared Fe 3 O 4 @TiO 2 decorated RGO nanosheets were proven to be a promising approach for Tl(I) removal from water.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Ke Yang,Shan Zhong,Hairong Yue,Siyang Tang,Kui Ma,Changjun Liu,Kai Qiao,Bin Liang
Pulsed chemical vapor deposition (P-CVD) is a promising technology for the surface modification of TiO 2 particles. For the scale-up application of P-CVD, a custom-designed rotary reactor and corresponding coating process at room temperature was developed in the present work. The obtained SiO 2 -coated TiO 2 particles were characterized by various measures including high-resolution transmission electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, etc . The results illustrated that the SiO 2 films with a thickness of (3.7 ± 0.7) nm were successfully deposited onto the surface of TiO 2 particles. According to the dye degradation tests and acid solubility measurement, the deposited film can effectively inhibit the photocatalytic activity and enhance the weatherability of the TiO 2 particles. Zeta potential measurements showed that the SiO 2 -coated TiO 2 is possible to be stably dispersed in the pH range of 6.9–11.6. The coating process made the whiteness of TiO 2 particles decreased slightly but still sufficient (97.3 ± 0.1) for application. Furthermore, the properties of the TiO 2 particles coated by P-CVD were compared with the particles coated by traditional wet chemical deposition. It is shown that the P-CVD can produce thinner but denser films with better photoactivity suppression performance. The developed coating process within the rotary reactor was proved practically feasible and convenient for the scale-up production of SiO 2 -coated TiO 2 via P-CVD.
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Solar RRL
·
2021
·Vol. 5
·期 4
·2000813
·
IF 8.582
Di Li,Changjian Zhou,Zhongkai Xie,Donghai Chen,Yimeng Zhou,Xiangli Shi,Deli Jiang,Min Chen,Weidong Shi
Due to the low charge separation efficiency and high stability of the CO 2 molecule, photoreduction of CO 2 into a single multielectron product such as CH 4 with a simultaneous high conversion rate and selectivity is challenging. Therefore, it is highly desirable to accelerate charge separation and transfer and provide an electron-enriched catalyst surface for the deep reduction of CO 2 . Herein, a Pd/Cu 2 O/TiO 2 ternary hybrid photocatalyst consisting of Pd nanoparticles (NPs) and Cu 2 O NPs-decorated TiO 2 nanosheets is rationally designed, and highly selective photocatalytic photoreduction of CO 2 into CH 4 is achieved. The Pd/Cu 2 O/TiO 2 photocatalyst shows a high CH 4 production rate of 42.8 μmol g −1 h −1 with an extremely high selectivity of 99.5%. This CH 4 production rate is 61.1, 5.4, and 2.8 times higher than the bare TiO 2 , Cu 2 O/TiO 2 , and Pd/TiO 2 , respectively. In this Pd/Cu 2 O/TiO 2 hybrid, a consecutive multistep charge transfer is steered between the Cu 2 O/TiO 2 heterojunction and Pd, ensures accelerated charge separation and transfer, and leads to the formation of a spatially separated electron-enriched surface (Pd) and hole-enriched surface (Cu 2 O). This spatially oriented charge transfer and the charge-enriched catalyst surface synergistically contribute to the simultaneous high conversion rate and selectivity of CH 4 .
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Analytical Methods
·
2021
·Vol. 13
·期 25
·2857-2864
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IF 2.896
Lan Wang,Huan Zhang,Hang Shi,Baodan Jin,Xiaoyun Qin,Geng Wang,Kucong Li,Tingting Zhang,Hongzhong Zhang
In this study, we develop a highly sensitive and selective photoelectrochemical (PEC) sensor for bisphenol A (BPA) determination by combining a TiO2/CdS heterostructure with inorganic framework molecular imprinting (MI) technology. A MI-TiO2/CdS heterostructure was synthesized via successive ionic layer adsorption combined with an inorganic framework molecular imprinting method. Due to the matched energy level distribution of TiO2 with CdS, the formed heterojunction promotes photogenerated charge separation and enhanced PEC conversion. The MI-TiO2/CdS based PEC sensor exhibits higher photocurrent responses and perfect selectivity for BPA under simulated sunlight irradiation. Benefiting from the unique heterostructure and special recognition ability of MI-TiO2/CdS, the photocurrent is linear to the concentration of BPA (range from 1 to 100 pmol L−1), with a low limit detection of 0.5 pmol L−1 (S/N = 3). Meanwhile, the detection results show that the PEC sensor exhibits excellent sensitivity, high selectivity, and good stability. Furthermore, the PEC sensor was successfully applied to the real environmental sample detection of BPA, in lake and river water, domestic wastewater and tap water. This PEC sensor exhibits favourable BPA detection, and it is also a promising method by which to measure other similar environmental substances selectively and sensitively in future work.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jingyou Yuan,Manoj Pudukudy,Tianding Hu,Yi Liu,Xiaofei Luo,Yunfei Zhi,Hongying Su,Lihong Jiang,Shaoyun Shan
The overuse of antibiotics triggered a serious environmental crisis, stimulating the development of feasible technologies for removing antibiotics from wastewater. Herein, a set of CeO x @C-TiO 2 composites with varying amounts of CeO x from 1% to 15% were synthesized and applied for the photodegradation of tetracycline (TC) for the first time. It was found that the composites exhibited excellent performance for TC removal by degradation and mineralization under visible-light irradiation. The uniform distribution of CeO x nanoparticles in C-TiO 2 permitted the surface contact of particles, enhancing their visible light absorption with a reduced band gap of 2.39 eV and electron-transfer efficiency through the formation of heterojunctions. The amount of CeO x played a predominant role in the photocatalytic properties. The 10% composite exhibited high removal rates of 99.1%, 98.2%, and 83.5% for 10, 20, and 40 mg/L TC, respectively. Characterization experiments proved that Ce mainly existed in its +3 and +4 valence states in the composites. The interchange of these two valence states accelerated the transfer of electrons and promoted the production of superoxide anion radicals and hydroxyl radicals responsible for TC degradation. These findings provide valuable guidelines for exploiting high-performance MOF-derived photocatalysts for the abatement of contaminants.
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Catalysts
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2021
·Vol. 11
·期 6
·661
·
IF 4.146
Xi Lin,Yanxia Li
In order to degrade toxic pollutants such as dyes during the process of sewage treatment, considerable attention has been paid to photocatalytic technologies. In this paper, TiO2/Ag[BMIM]Cl (1-butyl-3-methyl imidazolium chloride ([BMIM]Cl)) nanocomposites were prepared with TiO2as the carrier, silver ions as dopants and ionic liquids (IL) as modifiers. The morphologies, microstructures, crystalline structure and optical properties of the TiO2/Ag[BMIM]Cl nanospheres are investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), total organic carbon (TOC), and UV-vis diffuse reflectance spectrum (UV-vis DRS) techniques. The TiO2/Ag[BMIM]Cl nanocomposites can selectively degrade rhodamine B (Rh B) under visible light because of the unstable quaternary ammonium salt. The as-obtained nanocomposites exhibit better photocatalytic activity performance than pure TiO2, TiO2/IL, and TiO2/Ag+. The experimental results show that the Rh B degradation rate can reach 98.87% under optimized producing conditions by using the TiO2/Ag[BMIM]Cl composites as the catalyzer. It shows that simultaneous doping with silver ions and ionic liquids can significantly improve the photocatalytic activity of TiO2in Rh B degradation, indicating the formation of photosensitive AgCl in the process of TiO2/Ag[BMIM]Cl preparation. Ag+and IL addition exchange the band gap of TiO2and lengthen the visible wavelength range of the composite. The material has the advantages of low cost, facile preparation and reusability with the excellent degradation effect of Rh B.Keywords:TiO2/Ag[BMIM]Cl composites;rhodamine B;visible photocatalytic degradation
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Yanna Wu,Jianxian Zeng,Xiaoping Huang,Zhengqiu Yuan,Guoqing Liu,Jie Ding
Nanofiltration membrane with good separation performance can effectively remove dyes from wastewater. A new type of composite membrane (TiO 2 /PEI/PDA-SMA/PES), which possesses excellent dye/salt separation property, was facilely manufactured by a combined strategy of mixing styrene-maleic anhydride (SMA) with polyethersulfone (PES), polydopamine (PDA) coating, titanium dioxide (TiO 2 )/polyethylenimine (PEI) co-deposition and cross-linking. The as-prepared membranes were characterized using SEM, AFM , FTIR , surface zeta potential , water permeability and contact angle measurement. The effect of TiO 2 content on permeability and retention of membrane was discussed. Results demonstrate that TiO 2 /PEI/PDA-SMA/PES membrane is hydrophilic and positively charged, and it exhibits high permeability for pure water (73.2 L·m −2 ·h −1 ·bar −1 ), reasonable retention to dyes (98.6%, 92.3% and 90.4% for Congo Red, Rhodamine B and Crystal violet, respectively) and satisfactory transport to salts (39.5, 36.4, 30.6 and 29.4 L·m −2 ·h −1 ·bar −1 for Na 2 SO 4 , NaCl, MgSO 4 and MgCl 2 , respectively). In addition, the membrane shows a great antifouling performance and long-term stability during the filtration of dye/salt simulated wastewaters. Further, the membrane is used to treat actual textile wastewater. It also shows good separation performance (permeability 10.6 L·m −2 ·h −1 ·bar −1 , COD retention 98.2%, and color retention 99.7%). Perhaps it is fit for potential treatment of textile wastewater.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Yubo Pan,Yali Zhang,Yaoguo Huang,Yun Jia,Linlin Chen
Cyanide wastewater contains highly toxic contaminants such as free cyanide and metal-cyanide complex, it is necessary to find the appropriate degradation technologies. In this study, a simple and effective photocatalyst with enhanced adsorption and photocatalytic activity was developed. A new composite photocatalyst was successfully prepared by solid-state dispersion (SSD) method, which combined graphene oxide (GO), nano titanium dioxide (nano-TiO 2 ) and silicon-based zeolite (ZSM-5). The techniques of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), N 2 adsorption–desorption test, X-ray diffraction (XRD), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS) were used to characterize the samples. The experiments with different content of nano-TiO 2 , different wavelengths of light source, different catalyst dosage, control experiments of different materials, and the determination of pH value and zeta potential were also carried out. The results showed that the 3.0 g/L of GTZ-60 (GO/TiO 2 /ZSM-5 composite photocatalyst with a content of 60 wt% TiO 2 ) has the highest photocatalytic degradation efficiency under ultraviolet wavelength which the degradation efficiency of total cyanide and copper could reach 98.73% and 98.96%, respectively. The degradation of total cyanide followed the pseudo-first-order kinetics. The photoelectric properties of GTZ-60 obviously improved the migration and separation of photogenerated electrons ( e − ) and holes ( h + ), so that high photocatalytic efficiency was obtained. XPS analysis showed that cyanide was finally degraded to carbon oxide and nitrogen oxide. Copper and zinc are removed in the form of copper (Ⅱ) and zinc (Ⅱ).
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhihang Long,Xin Tong,Cheng Liu,Ali Imran Channa,Rui Wang,Xin Li,Feng Lin,Alberto Vomiero,Zhiming M. Wang
Colloidal semiconductor quantum dots (QDs) are promising building-blocks for the manufacture of cost-effective photoelectrochemical (PEC) cells towards efficient solar-to-hydrogen conversion. Nevertheless, the state-of-the-art QDs-based PEC systems still suffer from the frequent utilization of highly toxic elements in QDs (Cd and Pb), hindering their future practical applications and potential commercialization. Here, we report a PEC device fabricated using eco-friendly, near-infrared (NIR) ZnAgInSe (ZAISe) QDs and hybrid TiO 2 /graphene oxide (GO) film. Based on the synergistic effect of QD’s broad light absorption and excellent charge extraction/transport properties of TiO 2 /GO film, as-assembled QDs-photoanode exhibits an outstanding saturated photocurrent density of ~6.7 mA/cm 2 with good stability under standard 1 sun illumination. The introduction of functional GO can lead to the reduced charge transfer resistance, suppressed charge recombination, and enhanced electron transport within the QDs-TiO 2 photoanodes. The results offer a facile and effective method to enhance the performance of environmentally friendly QDs-based PEC devices and shed light on the development of low-cost, “green” and high-efficiency solar-to-hydrogen conversion system.
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BULLETIN OF THE KOREAN CHEMICAL SOCIETY
·
2021
·Vol. 42
·期 3
·452-458
·
IF 0.969
Dongbo Mi,Jinhaojie Cui,Siliang Kuang,Xiaofeng Dong,Haiyan Lu
Water radical cations, (H 2 O) n +• , have attracted considerable attention owing to their potential practical applications in analytical chemistry, structural chemistry, radiotherapy, and radiochemistry. Recently, atmospheric pressure chemical ionization has emerged as a versatile method for direct mass spectrometric analysis. Usually, H 3 O + is the major proton donor during ionization and only the pseudo molecular ion peaks, instead of molecular ions are detected. In this work, (H 2 O) 2 +• ions with high oxidizability and reactivity were generated using hydrothermally grown TiO 2 nanoneedle arrays in combination with a linear ion trap mass spectrometer under low operating voltage and applied to the direct mass spectrometric analysis of a mixture of volatile aromatic hydrocarbons. (H 2 O) 2 +• ions were generated with a high absolute ion current of up to 1.07 × 10 5 counts/s at atmospheric pressure. Using the generated (H 2 O) 2 +• as the primary ion permitted the tandem mass spectrometric analysis of a mixed vapor sample of aromatic hydrocarbons.
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