Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Longqu Xiao,Shiyang Zhang,Boqi Chen,Panpan Wu,Ningdong Feng,Feng Deng,Zhi Wang
Herein, a new type of photocatalyst, that is biochar/g-C 3 N 4 (BC/CN) composite, was successfully prepared from melamine and waste crawfish shells by a simple thermal condensation process and used to degrade enrofloxacin (ENR) wastewater under visible light. The structure and photoelectrochemical properties of the composites were thoroughly characterized. Results showed that there are obvious synergistic effects between BC and CN present in the composite. When the ratio of BC to CN is 2%, the catalyst (BC/CN-2%) has the best visible-light photocatalytic performance. The •O 2 − radicals were the main oxidation free radicals responsible for ENR removal and the radicals first attacked the piperazine moiety of the ENR, and further, the whole photocatalytic degradation pathway was proposed. This study provided a promising strategy for the synthesis of photocatalyst materials from waste crawfish shells and their application in the treatment of antibiotic wastewater.
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RSC Advances
·
2023
·Vol. 13
·期 12
·8383-8393
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IF 3.9
Yan Wang,Jingyu Xiu,Tao Gan,Haiming Zou,Feiyue Li
In this work, a visible light-driven La/TiO2@g-C3N4 photocatalyst was synthesized for the photodegradation of tetracycline hydrochloride (TCH) in the presence of peroxydisulfate (PDS) in an internal loop-lift reactor. The surface morphology and structure of La/TiO2@g-C3N4 have been characterized by XRD, SEM-EDS, FTIR, XPS, and UV/vis DRS. La/TiO2@g-C3N4 displays outstanding photocatalytic performance and reusability. After four reuse cycles of the vis/La/TiO2@g-C3N4/PDS system, the TCH degradation rate and efficiency still reached 0.083 min−1 and 97.68%, respectively. Reactive species in this system included free radicals SO4˙−, ˙OH, and ˙O2−, as well as non-radicals e−, and h+, as established from the results of chemical quenching experiments. Moreover, a mechanism of action of the vis/La/TiO2@g-C3N4/PDS system for TCH degradation was proposed. The acute toxicity of the reaction solution towards Photobacterium phosphoreum T3 spp. in the vis/La/TiO2@g-C3N4/PDS process increased during the first 60 min and then decreased, illustrating that vis/La/TiO2@g-C3N4/PDS provided an effective and safe method for the removal of TCH.
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 6
·2647
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IF 4.6
Peng Wang,Xu Han,Xianhong Zheng,Zongqian Wang,Changlong Li,Zhiqi Zhao
In order to improve the photocatalytic performance of g-C3N4, the g-C3N4/Ti3C2/Ag3PO4S-type heterojunction catalyst was prepared by electrostatic assembly method, and then the g-C3N4/Ti3C2/Ag3PO4/PAN composite nanofiber membrane was prepared by electrospinning technology. The morphology and chemical properties of the nanofiber membrane were characterized by SEM, FTIR, and XRD, and the photocatalytic degradation of tetracycline hydrochloride (TC) in water by the nanofiber membrane was investigated. The results showed that g-C3N4/Ti3C2/Ag3PO4could be successfully loaded on PAN and uniformly distributed on the surface of composite nanofiber membrane by electrospinning technology. Increasing the amount of loading and catalyst, lowering the pH value and TC concentration of the system were conducive to the oxidation and degradation of TC. The nano-fiber catalytic membrane had been recycled five times and found to have excellent photocatalytic stability and reusability. The study of catalytic mechanism showed that h+, •OH and •O2−were produced and participated in the oxidation degradation reaction of TC, and •O2−plays a major role in catalysis. Therefore, this work provides a new insight into the construction of high-performance and high-stability photocatalytic system by electrospinning technology.Keywords:photocatalytic;PAN nanofiber membrane;degradation;tetracycline;heterojunction
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NANO
·
2023
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IF 1.2
Yong Li,Manyu Liu,Mingqing Zhang,Yanfang Liu,Qinghua Zhao,Xin Li,Qianyu Zhou,Yuanfu Chen,Shifeng Wang
Photocatalytic technology is currently the most promising technology for environmental pollution control. The preparation of photocatalysts with excellent properties is the core of the development of photocatalytic technology. TiO 2 can form a heterojunction with g-C 3 N 4 , which can effectively inhibit the recombination of photogenerated electron–hole pairs, improve the mobility of photogenerated carriers, and thus improve the photocatalytic performance. In this study, NaCl was used as a template, and the loose and porous g-C 3 N 4 /TiO 2 heterojunction composite photocatalysts were prepared by the template method. Compared to the pure g-C 3 N 4 prepared by the conventional thermal polycondensation method and TiO 2 , the g-C 3 N 4 /TiO 2 heterojunction composite photocatalysts prepared in this study exhibited a greatly increased specific surface area, an improved light absorption performance, a significantly suppressed recombination of photogenerated electrons and holes. Furthermore, the g-C 3 N 4 /TiO 2 heterojunction composite photocatalysts exhibited excellent photocatalytic performance.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2023
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IF 8.7
Chen Yang,Jian Yang,Shuangshuang Liu,Mingxue Zhao,Xu Duan,Hongli Wu,Lang Liu,Weizao Liu,Jiangling Li,Shan Ren,Qingcai Liu
Owing to its feasibility, efficiency in light-harvesting and effectiveness in the interfacial charge transfer between two n-type semiconductors, constructing heterojunction photocatalysts have been identified as an effective way for enhancing the photocatalytic properties. In this research, a C–O bridged CeO 2 /g-C 3 N 4 (cCN) Step-scheme (S-scheme) heterojunction photocatalyst was constructed successfully. Under visible light irradiation, the cCN heterojunction exhibited the photocatalytic degradation efficiency of methyl orange, which was about 4.5 and 1.5 times higher than that of pristine CeO 2 and CN, respectively. The DFT calculations, XPS and FTIR analyses demonstrated the formation of C–O linkages. And the calculations of work functions revealed the electrons would flow from g-C 3 N 4 to CeO 2 due to the difference in Fermi levels , resulting in the production of internal electric fields . Benefiting from the C–O bond and internal electric field, the photo-induced holes in the valence band of g-C 3 N 4 and the photo-induced electrons from conduction band of CeO 2 would be recombined when exposed to visible light irradiation, while leaving the electrons with higher redox potential in the conduction band of g-C 3 N 4 . This collaboration accelerated the separation and transfer rate of photo-generated electron-hole pairs, which promoted the generation of superoxide radical (•O 2 − ) and improved the photocatalytic activity .
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Junyang Pan,Dan Hua,Yiping Hong,Xi Cheng,Fangsong Guo,Kok Bing Tan,Ziqi Zhong,Guowu Zhan
Photocatalytic membranes with concurrent catalytic oxidation and separating functions possess promising potentials for the degradation of organic pollutants in wastewater treatment. Herein, we designed a hybrid photocatalytic membrane ( viz. , g-C 3 N 4 /GO/MCE) by vacuum-filtration-assisted assembling method, consisting of graphitic carbon nitride (g-C 3 N 4 ) nanosheets as a top layer, graphene oxide (GO) nanosheets as an interlayer, and commercial mixed cellulose ester (MCE) as a substrate layer. The microstructures, chemical compositions, and physicochemical properties of the designed g-C 3 N 4 /GO/MCE membranes were systematically characterized by a series of characterization techniques. Particularly, photocatalysis-filtration reactor cells were designed for the evaluation of the simultaneous separation and photocatalytic degradation performance in a single unit using both organic dyes and antibiotics as modeling pollutants in wastewater. Four parameters were adopted to represent the integrated photocatalysis-filtration performance of our designed photocatalytic membranes, including permeance ( P ), rejection ( R’ , filtration alone), removal ( R , combined photocatalysis-filtration under light-irradiation), and degradation rate ( D ). The hybrid membranes showed superior permeance and solute removal under visible-light irradiation (300 W, λ > 420 nm), in which the permeance was 20% higher than that of no-irradiation conditions. In addition, 10 consecutive cycling tests and light-on/off cycles of the as-prepared g-C 3 N 4 /GO/MCE membrane toward RhB showed quite stable permeance in the range of 268.9 to 352.9 L h −1 m −2 bar −1 , and the removal was maintained in the range of 88.4% to 95.4%, indicating excellent long-term stability. Remarkably, it also exhibited good removal performance of antibiotics ( e.g. , ofloxacin, norfloxacin, sulfamethoxazole, erythromycin, and roxithromycin). Accordingly, the designed hybrid g-C 3 N 4 /GO/MCE photocatalytic membranes with excellent photocatalytic activity and photocatalysis-filtration performance are promising for wastewater treatment and water purification applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Fushan Wen,Le Pang,Tao Zhang,Xiaoli Huang,Yuan Xu,Yajie Li
The exploitation of the superior oxygen evolution reaction (OER) electrocatalysts is of great paramount importance to the investigation of developing hydrogen production from water splitting to alleviate the energy crisis. Herein, Fe 3+ ion doped NiS 2 for OER electrocatalysts obtained from a metal-organic framework (MOF) as a self-template, with the graphitic phase carbon nitride (g-C 3 N 4 ) as a chain armor, was prepared by the two-step solvothermal-pyrolysis method. The MOF-derived Fe–NiS 2 @g-C 3 N 4 composite achieves a current density of 10 mA cm −2 at a tiny OER overpotential (280 mV) and shows good stability in duration tests over 60 h. Compared with the undoped sample, the overpotential is significantly lower by 60 mV and the stability is substantially improved. In this study, two strategies, iron ion doping and g-C 3 N 4 coating, were implemented to target the defects of NiS 2 , promoting its catalytic activity and achieving a significant improvement in stability at the cost of a bit of activity. Balancing activity and stability maximized has been achieved by our work. This study presents a potential approach to improve the catalyst activity and stability in an integrated strategy.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jing Chen,Haitao Zhu,Qifang Ren,Shaohua Chen,Yi Ding,Zhen Jin,Wanmi Guo,Xinyu Jia
In this study, Cu 2 O/g-C 3 N 4 composite with photocatalytic activity was successfully prepared by chemical precipitation method. The catalytic degradation of ciprofloxacin (CIP) by Cu 2 O and Cu 2 O/g-C 3 N 4 composites with different morphologies was investigated. The effective structure and properties of Cu 2 O/g-C 3 N 4 composites were tested by a series of characterization methods. The photocatalytic test results show that the Cu 2 O/g-C 3 N 4 composite photocatalyst has good stability and good photocatalytic performance, which is attributed to the effective hetero-junction structure formed by the combination of Cu 2 O and g-C 3 N 4 , which promotes the interfacial charge separation. The addition of g-C 3 N 4 can reduce the crystal size of Cu 2 O, improve the crystal morphology, and increase its light utilization. Among the synthesized catalysts, the Cu 2 O-3(20%)/g-C 3 N 4 composite has the highest catalytic activity, and the photocatalytic oxidation efficiency of CIP is 96%. By free radical capture and ESR analysis, it was verified that OH, h + and O 2 − radicals may be the main active substances involved in CIP photodegradation. Finally, various degradation products and intermediates of CIP were identified by LC-MS, and the possible conversion pathways were proposed.
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Chemistry-An Asian Journal
·
2022
·Vol. 18
·期 2
·e202201139
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IF 4.839
Fengyun Su,Zhishuai Wang,Mengzhen Tian,Chunxia Yang,Haiquan Xie,Chenghua Ding,Xiaoli Jin,Jiaqi Chen,Liqun Ye
Graphical MoO 2 /g-C 3 N 4 composites were prepared, in which MoO 2 synergetic with Pt photo-deposited during H 2 evolution reaction worked as unilateral dual cocatalyst to improve the photocatalytic activity. The deficient MoO 2 not only promoted visible light absorption of g-C 3 N 4 , but also worked as a “electron pool” to capture and transfer electrons to Pt. Pt is usually used as cocatalyst for g-C 3 N 4 to produce H 2 by photocatalytic splitting of water. However, the photocatalytic performance is still limited by the fast recombination of photo-generated electrons and holes, as well as the poor absorption of visible light. In this work, MoO 2 /g-C 3 N 4 composites were prepared, in which MoO 2 synergetic with Pt photo-deposited during H 2 evolution reaction worked as unilateral dual cocatalyst to improve the photocatalytic activity. Within 4 hours of irradiation, the hydrogen production rate of MoO 2 -Pt dual cocatalyst modified g-C 3 N 4 reached 3804.89 μmol/g/h, which was 120.18 times of that of pure g-C 3 N 4 (GCN, 31.66 μmol/g/h), 10.98 times of that of MoO 2 modified g-C 3 N 4 (346.39 μmol/g/h), and 9.18 times of that of Pt modified g-C 3 N 4 (413.64 μmol/g/h). Characterization results demonstrate that the deficient MoO 2 not only promoted visible light absorption of g-C 3 N 4 , but also worked as a “electron pool” to capture and transfer electrons to Pt.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2023
·
IF 4.1
Shirong Kang,Hongjie Zhu,Linhua Wang,Xiaoyan Zhao,Xianqiang Huang,Hua Yang,Mingyu Dou,Dacheng Li,Jianmin Dou
Tetracycline, a class of micropollutants, is pharmaceutically active compound which cannot be disintegrated borrowing routine treatment methods. Herein, the nano-heterostructures with strong hydrophilicity were obtained via the intervention from acetonitrile and methanol double solvent system at the room temperature. Specifically, the hydrophilic sulfur-impregnated g-C 3 N 4 coupled with 1 dimensional CeO 2 were designed for enhancing dispersity and photocatalytic activity , the results of optical properties demonstrated sulfur-impregnated samples and composites expressed the low recombination of photogenerated carriers compared to the pristine material in that the newborn N–S bonding, which was confirmed via the density functional theory computation and X-ray photoelectron spectroscopy. In this work, the impregnation strategy adopted amplified the hydrophilicity of the material, which had reference significance for the study of hydrophilic and hydrophobic regulation of nanomaterials . Besides, the photodegradation mechanism and pathway of TC was investigated via the results of radical quenching experiment and mass spectrometry analysis , respectively. This study provided a reference for the fertilization modification of intrinsic semiconductor materials under the mixed solvent system and it was contributed to the photodegradation study of TC similarly.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Qi Wang,Biao Xue,Meng Tan,Ningyi Li,Hao Zhou,Hao Du,Guoxiang Yang,Huaze Zhu,Qiang Li
Heterogeneous photocatalysis have attracted extensive attention in the field of environmental remediation. The low charge separation efficiency and poor light response of single semiconductor can be remarkably improved through forming heterojunction . The construction of ternary heterojunctions can further inhibit the recombination of photogenerated charge carriers by the separated redox active sites. A novel and highly efficient Ag 3 VO 4 -BiVO 4 /C 3 N 4 ternary heterojunction were successfully synthesized and characterized in terms of structure, chemical composition and photocatalytic properties. The photocatalytic activities of as-synthesized photocatalysts were evaluated by the photocatalytic reduction of Cr(VI) in the aqueous solution. The photocatalytic Cr(VI) reduction rate of ternary heterojunction is 19 times higher than that by single BiVO 4 . The lower pH, higher concentration of coexisted organics and stronger light intensity endowed photocatalysts with better photocatalytic performance. More Cr(VI) ions were remained in the solution with higher initial concentration of Cr(VI) under the same light irradiation. The Cr(VI) ions could also be totally removed by the ternary heterojunction even after five cycling tests showing good cycling stability. The internal electric field between Ag 3 VO 4 , BiVO 4 and graphitic carbon nitride (C 3 N 4 ) facilitated the separation of photogenerated electron/hole pairs. The suitable band alignments endow ternary heterojunction with isolated oxidation and reduction reactions due to the separated holes and electrons, meanwhile, suppressing charge carrier recombination. This research provides guidance for the rational design of multi-components heterojunction for photocatalytic environmental remediation.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hongmiao Zhou,Jiayi Tian,Ruoyu Wang,Difu Zhan,Peng Liu,Ruolin Chen,Yizhong Huang,Zhifeng Liu,Changcun Han
Photocatalytic hydrogen (H 2 ) evolution is expected to be a promising approach to generating a clean energy source (H 2 ) with low carbon emissions, which is vital to solving environmental degradation and energy shortages. The critical challenge to designing highly efficient photocatalysts is the fast recombination of photo-generated carriers; thus, we select Ti 3 C 2 Cl 2 MXene with excellent metal characteristics to serve as a co-catalyst and combine with g-C 3 N 4 . The Ti 3 C 2 Cl 2 /g-C 3 N 4 composites exhibit an enhanced photocatalytic hydrogen evolution activity (maximum 155.9 μmol h −1 ) while they hardly perform photocatalytic activities. The photoluminescence (PL) spectra shows that Ti 3 C 2 Cl 2 MXenes help boost the separation of photo-generated carriers of g-C 3 N 4 and finally strengthen the photocatalytic hydrogen evolution performance. The ultraviolet–visible (UV–vis) spectra illustrate that composites perform a strengthened light absorption, which fits well with the results in the hydrogen evolution experiment. Thus, we fabricated a highly efficient photocatalyst through a safer molten salt approach without hydrofluoric acid (HF). We believe this work will offer a safer approach to manufacturing catalysts decorated with MXenes for highly efficient photocatalytic H 2 evolution.
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