CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Mingwei Shen,Guoqing Zhang,Jiayou Liu,Yuhang Liu,Jiayuan Zhai,Haochuan Zhang,Hesheng Yu
Photocatalysis has been widely employed as a promising method for wastewater treatment. However, existing studies are primarily conducted in batch reactors. To the best of our knowledge, a continuous reactor has not been used to degrade xanthate residual in mineral beneficiation wastewater. In this work, a continuous fixed-bed photoreactor (CFPR) was first designed, and Bi 2 WO 6 photocatalysts coated on silica sands were used to degrade sodium isobutyl xanthate (SIBX) under visible light irradiation. The effects of various parameters, including catalyst loading, pH level, initial SIBX concentration, wastewater flow rate, calcium ion (Ca 2+ ) concentration, magnesium ion (Mg 2+ ) concentration, and zinc ions (Zn 2+ ), on the degradation efficiency, were systematically investigated. The results show that the photodegradation percentage of SIBX increases with increasing catalyst loading, decreasing initial concentration, and decreasing flow rate within the scope under investigation. Additionally, low concentrations (30 mg·L −1 ) of Ca 2+ and Mg 2+ ions favor the photodegradation of SIBX, whereas excessive Ca 2+ and Mg 2+ ions (240 mg·L −1 ) inhibit photocatalytic activity. The presence of Zn 2+ ions inhibits photodegradation percentage. Furthermore, the photodegradation percentage is slightly higher at alkaline than at acidic pH. The maximum degradation percentage reached 95.40 % after 70 min of visible light irradiation under optimal conditions. In addition, a fixed bed reactor model considering surface reaction kinetics and mass transfer constraints was established by combining the Langmuir-Hinshelwood (L-H) kinetic equations and the series resistance theory. This model can accurately estimate the intrinsic kinetic parameters and can well predict degradation efficiency with a root-mean-square-error (RMSE) of 4.24 %. Finally, the bottleneck for improving the performance of the reactor can be identified under different conditions.
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RSC Advances
·
2023
·Vol. 13
·期 8
·5208-5218
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IF 3.9
Thi Viet Ha Luu,Ngoc Nhiem Dao,Hoang Ai Le Pham,Quang Bac Nguyen,Van Cuong Nguyen,Phuc Huu Dang
In this work, Ta-doped ZnO (Ta-ZnO) nanomaterials were synthesized by the hydrothermal method at different temperatures (110, 150, and 170 °C) for the photodegradation of methylene blue (MB) under visible light. Ta doping significantly affects the crystal defects, optical properties, and MB photocatalytic efficiency of ZnO materials. The optical absorption edge of Ta-ZnO 150 was redshifted compared to undoped ZnO, correlating to bandgap narrowing (EgTa–ZnO = 2.92 eV; EgZnO = 3.07 eV), implying that Ta doped ZnO is capable of absorbing visible light. Besides, Ta-doping was the reason for enhanced blue light emission in the photoluminescence spectrum, which is related to the oxygen defect V0O. It is also observed in the XPS spectra, where the percentage of oxygen in the oxygen-deficient regions (O531.5 eV) of Ta-ZnO150 is higher than that of ZnO150. It is an important factor in enhancing ZnO's photocatalytic efficiency. The MB degradation efficiency of Ta-doped ZnO reached the highest for Ta-ZnO 150 and was 2.5 times higher than ZnO under a halogen lamp (HL). Notably, the influence of hydrothermal temperature on the structural, morphological, and photoelectrochemical properties was discussed in detail. As a result, the optimal hydrothermal temperature for synthesizing the nanorod is 150 °C. Furthermore, photocatalytic experiments were also performed under simulated sunlight and natural sunlight. The nature of the photo-oxidative degradation of MB was also investigated.
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Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 5
·1650-1659
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IF 7
Lina Wang,Zhiping Wan,Xiaoxiang Xu,Jun Qian
Semiconductor heterostructures are of critical importance in steering the flow of photocarriers (i.e. e− and h+). Here, we have fabricated heterostructure-based semiconductor fibers comprising electrospun In2O3 nanofibers coaxially wrapped by CaIn2S4 nanofoils. The hybrid fibers are characterized by a strong interplay between CaIn2S4 and In2O3, enabling fast photocarrier separation to generate copious reactive species for disinfection. When illuminated by visible light (λ ≥ 400 nm), the hybrid fibers deliver exceptionally high photocatalytic activity for bacterial inactivation (7 log-reduction in viable cell count for 20 min), well-outcompeting the parent compounds, CaIn2S4–In2O3 mixtures, and many active photocatalysts reported. The hybrid fibers are type-II semiconductor heterojunctions in nature that can enrich photogenerated e− and h+ at the different components of the hybrid fibers. This work justifies the importance of semiconductor heterostructures in guiding photocarrier flows and offers a paradigm for the design of semiconductor hybrid fibers in the area of photocatalytic bacterial inactivation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jie Zhao,Yunning Chen,Renquan Guan,Xueying Cheng,Zhengkai Wu,Nana Zhao,Qingkun Shang,Yingnan Sun
In this paper, we successfully constructed two composite photocatalysts TiO 2 @PDI-NapSO 3 H and Fe-TiO 2 @PDI-NapSO 3 H by utilizing water-soluble PDI derivatives to bond with TiO 2 or iron-doped TiO 2 . Their photocatalytic performance to degrade phenol and diclofenac sodium (DCF) under visible light were investigated. The results show that PDI-NapSO 3 H can effectively improve the optical absorption properties of TiO 2 . Furthermore, the oxygen vacancy produced by doping of Fe in TiO 2 prevents the recombination of photogenerated carriers effectively. The larger conjugate plane of PDI-NapSO 3 H provides a convenient channel for the migration and separation of photogenerated carriers. Thus almost 99 % of phenol or DCF can be degraded by Fe-TiO 2 @PDI-NapSO 3 H within 90 or 120 min, respectively. However, the photocatalytic activity of Fe-TiO 2 @PDI-NapSO 3 H is better. The rate of phenol degradation is much higher than that of TiO 2 @PDI-NapSO 3 H. Further, through the photoelectric response characteristic analysis, radical trapping experiment and EPR test, the effects mechanism of the energy band structure, photogenerated carrier separation efficiency on the photocatalytic performance of Fe-TiO 2 @PDI-NapSO 3 H were discussed. In addition, the possible degradation pathways of DCF and the reasons for the obvious reduction of environmental toxicity after photocatalytic degradation were proposed.
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ADVANCED MATERIALS
·
2022
·Vol. 35
·期 3
·2208078
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IF 32.086
Shaocheng Liu,Zhenyu Guo,Xianxin Wu,Xinfeng Liu,Zijian Huang,Liang Li,Jinwen Zhang,Huanping Zhou,Ling-Dong Sun,Chun-Hua Yan
While quasi-two-dimensional (quasi-2D) perovskites have emerged as promising semiconductors for light-emitting diodes (LEDs), the broad-width distribution of quantum wells hinders their efficient energy transfer and electroluminescence performance in blue emission. In particular, the underlying mechanism is closely related to the crystallization kinetics and has yet to be understood. Here for the first time, the influence of bifunctional zwitterions with different coordination affinity on the crystallization kinetics of quasi-2D perovskites is systematically investigated. The zwitterions can coordinate with Pb 2+ and also act as co-spacer organic species in quasi-2D perovskites, which collectively inhibit the aggregation of colloidal precursors and shorten the distance of quantum wells. Consequently, restricted nucleation of high- n phases and promoted growth of low- n phases are achieved with moderately coordinated zwitterions, leading to the final film with a more concentrated n distribution and improved energy transfer efficiency. It thus enables high-efficiency blue LEDs with a recorded external quantum efficiency of 15.6% at 490 nm, and the operation stability has also been prolonged to 55.3 min. These results provide useful directions for tuning the crystallization kinetics of quasi-2D perovskites, which is expected to lead to high-performance perovskite LEDs.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xingyu Zhan,Yunxiong Zeng,Hao Zhang,Xinqing Wang,Dingfen Jin,Hongxiao Jin,Shenglian Luo,Liming Yang,Bo Hong
Carbon nitride photoactivity is limited by poor light utilization, rapid recombination of electron-hole ( e - -h + ) pairs, and sluggish surface/interface reaction. Surface/interface modification is a promising strategy to get rid of these restrictions. Therefore, understanding surface/interface properties is highly worth in-depth consideration to improve carbon nitride photoactivity. Herein, the nitrogen-vacancy (Nv) and oxygen substitution (Os) co-modified carbon nitride coral-like array were rationally designed by a combination of thermal calcination and hydrothermal process. Results verified Nv extended the adsorption edge toward visible light and hampered the recombination of e - -h + pairs and Os accelerated surface/interface kinetics. In consequence, the optimized photocatalyst (Nv, Os)-CN-6 can degrade 80 % of tetracycline (TC) with the pseudo-first-order kinetic constant of 0.124 min −1 , 13.8-fold higher than pristine carbon nitride. Furthermore, Nv and Os can well resist the toxic effect of interfering agents in simulated practical wastewater. Finally, Nv and Os endow (Nv, Os)-CN-6 mineralizing TC with low/non-ecology-risk intermediates evolution based on the HPLC-MS and T.E.S.T. software simulation. This study provides new insights into the rational design of carbon nitride for photodegrading TC.
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JOURNAL OF LUMINESCENCE
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2022
·
IF 4.171
Xi Zhang,Song Qing,Yi Qin,Qiang Zhou,Jing Wan,Huaijun Tang,Zhenglian Wang
Searching for efficient Mn 4+ red phosphors for white lighting and display backlighting has drawn great attention. In this work, an efficient Mn 4+ -doped fluoroscandate, Rb 2 KScF 6 :Mn 4+ , with short fluorescence lifetime is prepared via a facile co-precipitation method. It was found that the nonequivalent occupation of Mn 4+ for Sc 3+ leads to the identifications of sharp red emissions, enhanced zero-phonon line, high quantum efficiency and short fluorescence lifetime upon blue light excitation. Thanks to the luminescent properties, good optical parameters of high color rendering index, low correlated color temperature, and acceptable color gamut were achieved by coating the red Rb 2 KScF 6 :Mn 4+ phosphor with yellow Y 3 Al 5 O 12 :Ce 3+ or green β -SiAlON:Eu 2+ phosphor in various white light-emitting diodes, demonstrating its potential role for white light illumination and backlight display applications.
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ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Xiaoqian Zhang,Zhipeng Wu,Yixiao Wu,Abdulmoseen Segun Giwa,Shaobin Huang,Lishan Niu
Environmental dissemination caused by widespread use of antibiotics has been regarded as a possible hazard to aquatic ecosystem and human health. The increasing misgivings make it imperative to develop a novel catalyst with remarkable visible-light-driven activity to remove antibiotics, especially for their simultaneous decontamination . Herein, C/BiOCl composites were successfully prepared by decorating BiOCl nanosheets on food wastes biochar (C) by a simple hydrolysis strategy. Not only the binary system of tetracycline antibiotics, but also the ternary mixture could be simultaneously photodegraded over 25% C/BiOCl within 15 min irradiation. The improved photocatalytic activities could be ascribed to the introduction of biochar, endowing increased surface area, enhanced separation of photo-generated charge carriers, and better light absorption . The as-prepared 25% C/BiOCl also demonstrated satisfactory stability and positive removal effect in actual water samples. The present work provides new insights into the development of biochar-based photocatalysts for simultaneous degradation of multiple antibiotics.
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 11
·1429
·
IF 4.501
Yali Song,Huan Zhang,Ziyan Li,Long Huang,Junhao Xie,Long Han,Ruoying Zheng,Yuqing Zhang,Hongzhong Zhang
Previous studies have displayed various conclusions about the effect of preparation factors on the photoreduction property of ZnIn2S4. Therefore, it is not easy to figure out the optimal preparation conditions of ZnIn2S4for Cr(VI) photoreduction. To ensure Cr(VI) reduction efficiency, various ZnIn2S4photocatalysts were prepared in different solvents (i.e., water and ethylene glycol) and temperatures (i.e., 120 °C, 150 °C and 180°C). Different characterization methods were used to explain the difference in optical performance and photocatalytic property among the obtained samples. The results show that all the samples exhibit a similar band gap. The reaction solvent and temperature have a great influence on the surface morphology and optical property, leading to the different photocatalytic properties. ZnIn2S4synthesized at 120 °C in the solvothermal condition shows the optimal efficiency on Cr(VI) photoreduction due to the effective utilization of photo-induced carriers. The reasonable analysis and effective conclusion presented may provide the optimal synthesis method of ZnIn2S4to effectively remove Cr(VI) from water environment.Keywords:ZnIn2S4;Cr(VI);solvothermal;hydrothermal;photoreduction
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Xiaoming Liu,Yinchu Zhang,Hongwei Wang,Jiajun Yan,Liushui Yan,Kexin Li,Huiqin Guo,Wang Gong,Jun Lin
In this work, a series of Zn x Cd 1-x S solid solutions are firstly prepared by a solvothermal process. The optimized composition of Zn x Cd 1-x S solid solution is determined to be Zn 0·2 Cd 0.8 S. On this basis, the Cu 7 S 4 /Zn 0·2 Cd 0·8 S composite photocatalyst with a binary p-n heterojunction has been synthesized by a co-precipitation process followed by a solvothermal method . Owning to the synergistic effect of the heterojunction structure in the interface of Cu 7 S 4 (p-type) and Zn 0·2 Cd 0·8 S (n-type) and the built-in electric field in binary p-n heterojunction, the as-prepared Cu 7 S 4 /Zn 0·2 Cd 0·8 S composite photocatalyst exhibits a significantly improved photocatalytic activity toward hydrogen production from water with visible light response, which is approximately 5.0 times and 16.5 times higher than of pristine Zn 0·2 Cd 0·8 S and CdS, respectively. The possible photocatalytic mechanism has been proposed basing on a series of experimental results. The current work might be valuable inspirations for designing highly efficient heterojunction composite photocatalyst for solar hydrogen evolution .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Huayi Cai,Jingjing Wang,Zhao Du,Zhiyuan Zhao,Yaxin Gu,Zhonglu Guo,Yang Huang,Chengchun Tang,Guifeng Chen,Yi Fang
Photocatalysis has attracted much attention in the field of environmental remediation. However, the photocatalytic performance largely depends on efficient charge migration and solar light utilization. Herein, the ternary MoSe 2 /ZnO/p-BN (MZB) photocatalyst was successfully designed and synthesized. The degradation rate of the optimal sample 30 wt% MZB for ofloxacin (OFL) under visible light irradiation can reach 99.2%, and the photocatalytic reaction rate is 5.33 times and 2.10 times higher than that of pure ZnO and ZnO/p-BN. In the MoSe 2 /ZnO/p-BN system, p-BN can achieve the enrichment of pollutant to accelerate the catalytic rate, while the hybridization of MoSe 2 expands the spectral response of the catalysts. In addition, the formation of stepped electron transport routes reduces the electron-hole pair recombination rate. The active species quenching experiments reveal that e - , •O 2 − , h + and •OH play a major role in the removal of antibiotic contaminants. The analysis of OFL degradation intermediates reveals the possible degradation pathways and proposes a reasonable photocatalyst mechanism. Therefore, this work provides new ideas for designing high-performance visible light responsive photocatalysts for pollution treatment.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yisheng Xu,Yaoheng Liang,Zeng Yuai,Hangyu Long,Qizhi He,Kaijin Guo,Yuyuan Zhang,Dongchu Chen,Xuejun Xu,Huawen Hu
Although g-C 3 N 4 (CN) materials have been extensively explored for the photocatalytic degradation of organic pollutants, their weak response to visible light and fast recombination of photoexcited electron-hole pairs restrain their practical applications. Herein, we deeply mediated the CN's energy-band structure, morphology, and surface properties by non-metal (P) and metal (Mo) co-doping based on the thermal treatment of a phosphomolybdic acid hydrate and dicyandiamide mixture in a straightforward one-step manner. Meanwhile, cyano groups and nitrogen vacancies were generated as a result of the co-doping, and the resulting P, Mo co-doped CN (PM-CN) exhibited thinner layers, smaller sizes, and superior visible-light harvesting capacity and charge separation efficiency. Consequently, highly active PM-CN was obtained for photocatalytic tetracyclines (TC) degradation, and the rate was calculated to be 0.01 min −1 , 3.3 times greater than that of the pure CN, outstripping the single P- and Mo-doped counterparts. A free radical scavenging test demonstrated that the reactive species •O 2− and h + were critical in TC degradation. The present work is expected to shed light on co-doping CN with non-metal and metal elements to obtain high-performance, visible-light-responsive photocatalysts for practical environmental remediation.
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