SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Ruijing Xu,Wenjie Zou,Ting Wang,Jun Huang,Zhijun Zhang,Chengyan Xu
Flocculation has been widely employed in treatment of mineral tailings and water management. In this study, a chitosan- graft -poly(acrylamide-dimethyl diallyl ammonium chloride) (Chi-g-P(AM-DMDAAC)) was synthesized in-house. The adsorption and interaction mechanisms of Chi-g-P(AM-DMDAAC) and an anionic polyacrylamide (APAM) in a two-step flocculation process of kaolinite were explored using settlement tests, zeta potential measurement, quartz crystal micro-balance with dissipation (QCM-D) and atomic force microscopy (AFM) technique. The type of primary flocculant was critical for the two-step flocculation process. The treatment of the kaolinite suspension using 1 mg/L of Chi-g-P(AM-DMDAAC) followed by adding 2 mg/L of APAM displayed more efficient flocculation performance. QCM-D results showed that three dissipative layers were assembled on model kaolinite surface after sequentially injecting 3.5 mg/L of Chi-g-P(AM-DMDAAC), 0.05 wt% kaolinite suspension and 2.5 mg/L of APAM. The above total adsorption amount (Δ f of −64.9 Hz) was much higher than that of using the two flocculants in reverse order (Δ f of −23.1 Hz). This result indicated that the adsorption layer of the positively charged Chi-g-P(AM-DMDAAC) on kaolinite surface provided active adsorption sites for APAM. Further AFM measurement confirmed that the average adhesion between the silicon tip adsorbed Chi-g-P(AM-DMDAAC) and model kaolinite surface in 2.5 mg/L APAM solution increased from 0.25 ± 0.1 nN to 4.2 ± 0.3 nN with the effective interaction range of 700 nm, which was stronger than that measured between a bare silicon tip and silica substrate in single-component-flocculant solutions. The highly efficient two-step flocculation process could be ascribed to the strong electrostatic attraction between the kaolinite and the oppositely charged Chi-g-P(AM-DMDAAC) and APAM. Findings in this study will benefit the development of environmentally friendly flocculant for mineral tailings and water treatment .
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Yundong Zeng,Yunlan Xu,Dengjie Zhong,Haoyang Yao,Nianbing Zhong
The development of traditional photocatalytic fuel cell (PFC) is severely hindered by poor visible-light response and limited reaction space. In this study, a visible-light responsive PFC with g-C 3 N 4 /BiOI/Ti photoanode was proposed and applied to activate peroxymonosulfate (PMS) to degrade rhodamine B. The degradation rate, maximum power density and maximum photocurrent density of the PMS/PFC system were respectively 95.39%, 103.87 μW cm −2 and 0.62 mA cm −2 , which was respectively 1.28, 2.18, and 1.98 times that of PFC. The excellent performance is attributed to the production of more reactive oxygen species and the extension of the reaction space range after the activation of PMS. The activation pathway of PMS and charge transfer pathway of the photoanode were discussed in detail, and it was proposed that PMS was activated by Z-scheme heterojunction g-C 3 N 4 /BiOI/Ti photoanode.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Xiaoming Liu,Suqing Wang,Fang Yang,Yinchu Zhang,Liushui Yan,Kexin Li,Huiqin Guo,Jiajun Yan,Jun Lin
In this paper, a novel Au/g-C 3 N 4 /ZnIn 2 S 4 plasma photocatalyst heterojunction composite with 3D hierarchical microarchitecture has been successfully constructed by integrating Au/g-C 3 N 4 plasmonic photocatalyst composite with 3D ZnIn 2 S 4 nanosheet through a simple hydrothermal process. The Au nanoparticles were firstly anchored on the surface of pristine g-C 3 N 4 material to get Au/g-C 3 N 4 plasmonic photocatalyst. Ascribing to the surface plasmon resonance of Au nanoparticles , the obtained Au/g-C 3 N 4 plasmonic photocatalyst shows a significant improved photocatalytic activity toward hydrogen production from water with visible light response comparing with pristine g-C 3 N 4 . Further combining Au/g-C 3 N 4 plasmonic photocatalyst with 3D ZnIn 2 S 4 nanosheet to construct a heterojunction composite. Owing to the synergistic effect of the surface plasmon resonance of Au nanoparticles in Au/g-C 3 N 4 and the heterojunction structure in the interface of Au/g-C 3 N 4 and ZnIn 2 S 4 , the prepared Au/g-C 3 N 4 /ZnIn 2 S 4 plasma photocatalyst heterojunction composite shows an excellent photocatalytic activity toward hydrogen production from water with visible light response, which is around 7.0 and 6.3 times higher than that of the pristine C 3 N 4 and Znln 2 S 4 nanosheet, respectively. The present work might provide some insights for exploring other efficient heterojunction photocatalysts with excellent properties.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 24
·28321-28334
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IF 2.478
Jiang Yinying,Wang Yizheng,Zhou Kuan,Ding Senxu,Yu Jiang
In recent years, heterojunction photocatalytic materials have received more and more attention. Ball milling and microwave–assisted heating were used in this work to prepare the g–C 3 N 4 /TiO 2 heterojunction photocatalytic nanocomposites with different g–C 3 N 4 /TiO 2 mass ratios (0.5:1, 1:1, 2.5:1, 5:1, 10:1, 20:1, 30:1, and 40:1, labeled as TCN–1, TCN–2, TCN–3, TCN–4, TCN–5, TCN–6, TCN–7, and TCN–8, respectively). The crystal structure, morphology, and optical properties of the samples were characterized by various analytical techniques. The photocatalytic activity was evaluated by the degradation efficiency of Rhodamine B (RhB) and methylene blue (MB) under visible light and UV irradiation. After 120 min at visible light illumination, TCN–7 had the best degradation efficiency with 99.41% for RhB and 91.75% for MB, whereas after 120 min at UV light illumination, TCN–7 exhibited the best degradation effect, and the efficiency reached at 48.66% for RhB and 71.64% for MB, respectively. The analysis of crystal structure of the as–prepared TCN samples confirmed that TCN–7 has a good crystallinity, which is facilitated for photocatalytic activity. In photocatalytic reactions, superoxide radical (·O 2 − ), hydroxyl radical (·OH), and hole (h + ) are recognized as the main active groups, and ·O 2 – plays the main role for TCN–7 in the photocatalytic reaction system for the degradation of RhB.
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MICROCHIMICA ACTA
·
2023
·Vol. 191
·期 1
·1-12
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IF 5.7
Liu Xinyu,Yu Yang,Xie Tianhua,Cao Zijin,Li Zhiyan,Li Yuejing,Gu Yingqiu,Han Caiqin,Yang Guohai,Qu Lulu
Monolayer g-C 3 N 4 -modified Au/Ag nanorods (g-C 3 N 4 /Au/Ag NRs) array is fabricated as a dual-function platform with high surface-enhanced Raman scattering (SERS) response and excellent photocatalytic degradation ability for bisphenol A (BPA) residues. FDTD simulation results of Au/Ag NRs proves that the electromagnetic field intensity is significantly enhanced at the gap of Ag NRs and Au NPs and the protrusion of Au NPs, which endows the arrays with excellent SERS activity. The arrays exhibit high sensitivity for rhodamine 6G (R6G) (LOD = 1.1 × 10 -11 mol/L) and high SERS enhancement (EF = 9.2 × 10 7 ). In addition, the g-C 3 N 4 /Au/Ag NRs could degrade ˃90% of BPA adsorbed on the substrate surface within 140 min under visible light irradiation, and maintains its SERS activity after repeated use for 4 times. The dual-function platform with high SERS response and excellent recycling capability is proved to be reliable and is very promising for monitoring of BPA residues in food. Graphical abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Desen Zhou,Xuan Zhang,Zheng Li,Jun Zhang,Tielin Wang,Shaowen Cao
Photocatalytic conversion of CO 2 to usable fuels provides a new strategy for solving energy problems and the greenhouse effect. Porphyrin-based metal-organic frameworks (MOFs) are promising in photocatalysis due to their remarkable light harvesting ability, and the metal active site and its coordination environment can be further adjusted to achieve the high activity. In this work, g-C 3 N 4 /PCN-222 composites with different porphyrin metal centers were fabricated and the g-C 3 N 4 /PCN-222(Fe III ) catalyst showed the highest photocatalytic CO 2 reduction performance than that of g-C 3 N 4 /PCN-222(Fe II ) and other g-C 3 N 4 /PCN-222( M , M = Co, Ni, Cu, Zn) composites. Experimental studies and theoretical calculations showed that the axial coordination in g-C 3 N 4 /PCN-222(Fe III ) distorts the square planar field (Fe-N4) to quasi-octahedral coordination, which led to the moderate adsorption ability of CO 2 reduction intermediate (*CO), resulting in the high photocatalytic activity.
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ANALYTICAL CHEMISTRY
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2017
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IF 6.32
Xue Li,Lusheng Zhu,Yunlei Zhou,Huanshun Yin,Shiyun Ai
A novel photoelectrochemical (PEC) assay is developed for sensitive detection of protein kinase A (PKA) activity based on PKA-catalyzed phosphorylation reaction in solution and signal amplification strategy triggered by PAMAM dendrimer and alkaline phosphatase (ALP). In this strategy, it is noteworthy at this point that PKA phosphorylation was achieved in solution instead of on the surface of the electrode, which has advantages of the good contact in reactants and simple experimental procedure. For immobilizing the phosphorylated peptide (P-peptide) on electrode surface, graphite-like carbon nitride (g-C3N4) and titanium dioxide (TiO2) complex is synthesized and characterized, which plays a significant role for TiO2 conjugating phosphate groups and g-C3N4 providing PEC signal. Subsequently, PAMAM dendrimer and ALP can be captured on P-peptide and TiO2/g-C3N4 modified ITO electrode via interaction between the -COOH groups on the surface of PAMAM dendrimer and the -NH2 groups of peptide and ALP, which can lead to the increase of ALP amount on the modified electrode surface assisted with the PAMAM dendrimer. As a result, the amount of ALP catalyzes of L-ascorbic acid 2-phosphate trisodium salt (AAP) to produce electron donor of ascorbic acid (AA), resulting in an increased photocurrent. The proposed detection assay displays high selectivity and low detection limit of 0.048 U/mL (S/N = 3) for PKA activity. This biosensor can also be applied for the evaluation of PKA inhibition and PKA activity assay in cell samples. Therefore, the fabricated PEC biosensor is potentionally well in PKA activity detection and inhibitor screening.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Hongxu Liu,Junhao Xie,Jingxuan Zhao,Ruijia Wang,Yuchao Qi,Shulin Sun
Traditional water treatment membranes always face the problem of membrane contamination in the practical application. Those contaminants deposited on the membrane surface and inside the membrane pores make the filtration process more difficult. Herein, the temperature and photo sensitive nanocomposite membranes with superior wasterwater separation and light-cleaning capabilities were prepared by a non-solvent induced phase separation method, which combined the thermo-responsive property of poly(N-isopropylacrylamide) (PNIPAAm) grafted polyvinylidene fluoride (PVDF) and the high photothermal conversion character of core–shell structured BN@PDA-Ag nanosheets. The membranes can be heated to high temperature within a short period of light exposure due to the fast photothermal conversion capability of Ag and the excellent thermal conductivity of boron nitride (BN). The increase in temperature led to the contraction of PNIPAAm chains and bigger pore size. The microstructure, filtration, and cleaning performance of the nanocomposite membranes can be controlled by illumination, which allowed PVDF-g-PNIPAAm/BN@PDA-Ag membranes to achieve the effect of first interception and then cleaning. The membranes showed retention rates of 82, 99 and 95 % for BSA, oil–water emulsions and various dyes with flux recovery rates of > 90 % after light cleaning. This work provides a simpler, more efficient membrane cleaning strategy with superior potential for dealing with membrane contamination.
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Nanomaterials
·
2023
·Vol. 13
·期 22
·2964
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IF 5.3
Yilin Pan,Kai Qiao,Chuangyu Ning,Xin Wang,Zhiquan Liu,Zhihong Chen
g-C3N4has been regarded as a promising photocatalyst for photo-reforming antibiotics for H2production but still suffers from its high charge recombination, which has been proven to be solvable by constructing a g-C3N4homo-junction. However, those reported methods based on uncontrollable calcination for preparing a g-C3N4homo-junction are difficult to reproduce. Herein, an amorphous/crystalline g-C3N4homo-junction (ACN/CCN) was successfully synthesized via the electrostatic self-assembly attachment of negatively charged crystalline g-C3N4nanorods (CCN) on positively charged amorphous g-C3N4sheets (ACN). All the ACN/CCN samples displayed much higher photo-reforming of antibiotics for H2production ability than that of pristine ACN and CCN. In particular, ACN/CCN-2 with the optimal ratio exhibited the best photocatalytic performance, with a H2evolution rate of 162.5 μmol·g−1·h−1and simultaneous consecutive ciprofloxacin (CIP) degradation under light irradiation for 4 h. The UV–vis diffuse reflectance spectra (DRS), photoluminescence (PL), and electrochemical results revealed that a homo-junction is formed in ACN/CCN due to the difference in the band arrangement of ACN and CCN, which effectively suppressed the charge recombination and then led to those above significantly enhanced photocatalytic activity. Moreover, H2was generated from the water reduction reaction with a photogenerated electron (e−), and CIP was degraded via a photogenerated hole (h+). ACN/CCN exhibited adequate photostability and reusability for photocatalytic H2production with simultaneous CIP degradation. This work provides a new idea for rationally designing and preparing homo-junction photocatalysts to achieve the dual purpose of chemical energy production and environmental treatment.Keywords:H2production from wastewater;carbon nitride;homo-junction
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yuzhen Li,Zhaoxin Sun,Sufang Wang,Runbin Duan,Shaojie Wang,Shuo Li,Borong Lan,Lizhen Gao
Herein, the ternary CdS/Zn 2 In 2 S 5 /g-C 3 N 4 (CdS/ZIS/CN) heterojunction photocatalyst was successfully prepared via a one-pot method for photodegradation of tetracycline (TC) under visible light irradiation. The surface morphology, structure and optical properties of the prepared photocatalytic material were analyzed by XRD , SEM , TEM, UV–vis DRS, FT-IR and PL . Moreover, the experimental results exhibited that the ternary CdS/ZIS/CN photocatalyst revealed excellent photocatalytic activity compared with g-C 3 N 4 . In this work, 94.73% of TC (20 mg/L, pH=11) was degraded by 0.5 g/L 30CdS/ZIS/CN within 60 min of visible light irradiation. Additionally, the degradation rate of the photocatalyst decreased by about 9.41% after the fourth cycle, indicating its high stability and reusability. Subsequently, a possible double type-II mechanism of photodegradation was eventually provided based on active radical capture experiments. The current investigation provided a promising strategy to construct the high-efficiency heterojunction photocatalyst to degrade antibiotic contaminants.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Huijie Wang,Qi Liu,Mengyang Xu,Chenlong Yan,Xianghai Song,Xin Liu,Huiqin Wang,Weiqiang Zhou,Pengwei Huo
The localized surface plasmon resonance (LSPR) effect has shown significant progress in enhancing the efficiency of light absorption and separating photogenerated carriers. Herein, the dual-plasma enhanced 2D/2D/2D g-C 3 N 4 /Pd/MoO 3-x (CPM) S-scheme heterojunction photocatalysts were synthesized using the method of hydrothermal and electrostatic self-assembly for high-selectivity photocatalytic reduction of CO 2 to produce CO. The dual LSPR effect of MoO 3-x and ultrathin Pd nanosheets synergistically broadened the optical response range of the CPM composites and successfully improved the photocatalytic activity and near-infrared (NIR) performance. The optimized CPM-30 photocatalysts exhibited CO yields of 18.55 μmol g −1 with a selectivity of 96.3%. In addition, the CO yield reached 3.92 μmol g −1 after 4 h of NIR light photoirradiation. The electron spin resonance (ESR) and ultraviolet photoelectron spectroscopy (UPS) tests showed that the S-scheme heterojunctions were constructed by coupling g-C 3 N 4 /Pd nanosheets and MoO 3-x . This work will provide a reference for improving product selectivity through the design of two-dimensional composites and the utilization of plasma materials.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Xiaoxia Ou,Pu Chen,Ke Zhao,Cunjie Xia
A novel ternary photocatalyst with a Z-scheme heterojunction was successfully synthesized through the deposition of Ag nanoparticles onto the surface of a ZnO/g-C 3 N 4 composite. The prepared photocatalysts were characterized by XRD , FT-IR, XPS , HRSEM, TEM , DRS, PL, EIS, TPC , and M-S. The photocatalytic performance of the as-synthesized photocatalysts was systematically investigated through the photodegradation of norfloxacin (NOR) and rhodamine B (RhB) under visible light irradiation. The photodegradation efficiency of 5% Ag/ZnO/g-C 3 N 4 (5AZCN) composite photocatalyst reached 86.7% (480 min) and 98.0% (60 min) for NOR and RhB, respectively. Moreover, the apparent rate constants of the 5AZCN composite photocatalysts for NOR and RhB were found to be 3.4 and 22.2 times higher than that of the ZCN composite photocatalysts, respectively. The significantly enhanced photocatalytic performance was ascribed to the widened range of visible light response and the efficient separation and migration of carriers facilitated by the introduction of Ag nanoparticles that functioned as electron transfer mediators. Based on the free radicals quenching experiment and electron spin resonance (ESR) spectroscopy characterization, superoxide radicals (·O 2 − ) were the main reactive species in the photodegradation process. Furthermore, the charge transfer process was proved to be a Z-scheme transfer mechanism. This work provides a promising approach to simply constructing novel efficient Z-scheme photocatalysts for the elimination of environmental pollutants.
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