ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2026
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IF 12.2
Yiqun Cao,Huiying Xuan,Jun Liu,Hao Li,Peng Zhang,Tianzeng Chen,Yonghong Wang,Biwu Chu,Pengfei Liu,Yujing Mu,Qingxin Ma,Hong He
H2O2 is a vital atmospheric oxidant, while its photolysis in the troposphere is negligible in conventional view. For the first time, we find that gas-phase H2O2 can undergo heterogeneous photolysis to produce OH radicals on the surfaces of particles such as SiO2, Fe2O3, and Na2SO4 under solar irradiation, which further convert NO to produce HONO and NO2. It is demonstrated that acidity can inhibit the formation of HONO and promote the formation of NO2 significantly. Moreover, the heterogeneous photolysis of H2O2 is dependent on the reactivity of particles, with inert surfaces being more conducive to the generation of OH radicals. A MCM box model indicates that the HONO formation rate via the H2O2 heterogeneous reaction can reach 0.10 ppb·h–1 at 9 a.m., and the relative contribution to the total daytime HONO production can account for approximately 5% at 1 p.m. Given the ubiquitous presence of SiO2 in mineral dust particles, glass curtain walls, and terrestrial soils, these findings indicate that heterogeneous photolysis of H2O2 on the particle surface could be a potential source of daytime HONO. Our research also underscores the importance of atmospheric interfacial chemistry and its contribution to unknown sources of atmospheric oxidizing capacity.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
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IF 19.7
Wenrui Dai,Shao Zhang,Shuangjun Li,Haoran Du,Jiajia Gao,Shuning Xiao,Pengfei Xia,Shan Hu,Hexing Li,Xiaoyan Liu,Ru Zheng,Dieqing Zhang
A metal-free PEI/Nv-C 3 N 4 photocatalyst enables efficient gas-phase NO oxidation via an in situ photo-self-Fenton process. • Nitrogen vacancies and PEI cooperatively regulate interfacial electronic structure, O 2 activation, and proton-coupled electron transfer. • PEI functionalization switches ROS evolution from a ·O 2 ⁻ pathway to an H 2 O 2 /·OH-dominated oxidation pathway. • PEI/Nv-C 3 N 4 achieves 85% NO removal, 98.4% nitrate selectivity, and stable operation over 800 min under visible light. Photo-Fenton processes are highly effective for pollutant degradation, yet their application to gas-phase NO oxidation remains limited by metal leaching, external H 2 O 2 addition, and inefficient oxidant utilization. Herein, we develop a metal-free photocatalyst based on polyethyleneimine-functionalized nitrogen-vacancy-rich graphitic carbon nitride (PEI/N v -C 3 N 4 ) for efficient NO oxidation via an in situ photo-self-Fenton process under visible light irradiation. Nitrogen vacancies serve as the primary sites for O 2 adsorption and activation, while PEI functionalization reconstructs the interfacial electronic structure by introducing defect-molecule coupled mid-gap states and a proton-rich microenvironment. This molecular-defect synergy alters the oxygen reduction pathway from a conventional one-electron route toward a selective two-electron process (O 2 → ⁎OOH → H 2 O 2 ), followed by efficient in situ H 2 O 2 activation into ·OH radicals. Simultaneously, PEI enhances NO adsorption and stabilizes NO-derived intermediates, facilitating their complete oxidation into nitrate. As a result, PEI/N v -C 3 N 4 achieves 85% NO removal efficiency, 98.4% nitrate selectivity, and stable operation over 800 min without introducing metal components. Combined experimental and theoretical analyses reveal a mechanistic transition from a ·O 2 - -dominated pathway to an H 2 O 2 /·OH-mediated photo-self-Fenton process. This work provides a general molecular-defect co-engineering strategy for regulating ROS evolution in metal-free photocatalytic systems toward sustainable air purification. Download: Download high-res image (170KB) Download: Download full-size image This research shows an in situ generation and activation pathway of H 2 O 2 enabled by metal-free catalysts, enhancing the efficient removal of gas phase NO via photo-self-Fenton reaction.
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CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Chen Huang,Dongchao Qiu,Xiang Li,Lixia Wu,Fanglian Huang,Zhangyan Ye,Youyun Zeng
Enzyme-mediated bacterial active endocytosis enhanced the permeability of NG/NO to biofilms. • The chemical structures of Schiff base and NONOates provided dual proton-responsive of gas release. • NO induces S-nitrosylation of PDEs in S. mutans 。, thereby reducing lactate production. Dental caries in permanent teeth have remained one of the most prevalent oral diseases over the past three decades, with their global incidence exhibiting a steady upward trajectory. Streptococcus mutans ( S. mutans ) colonization on dental surfaces, coupled with its acidogenic metabolic activity, constitutes a primary etiological factor in caries pathogenesis. In this work, a NO-loaded polysaccharide nanogel, NG/NO was developed to address this issue. Dextran component of the NG/NO demonstrated selective targeting capabilities, promoting active internalization by S. mutans through enzyme-mediated endocytosis. This mechanism significantly enhanced biofilm penetration of the NG/NO (>70% biofilm penetration depth) within a 4-h exposure. The Schiff base bonds and N-diazeniumdiolates conferred the dual-acid-responsive NO release kinetics, achieving mM concentration of NO liberation within several minutes under cariogenic conditions (pH 4.5–5.5), thereby triggering rapid biofilm disrupting (>80% biomass reduction). Moreover, lower concentration of NO was shown to inhibit glycolysis and synthesis of lactic acid in S. mutans , thus improving acidic environment and demonstrating the potential to prevent enamel demineralization and dental caries. In conclusion, the NG/NO has promising applications in daily oral hygiene maintenance and caries prevention.
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FUEL
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2023
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IF 7.4
Xue Li,Xiaolong Liu,Hao Tang,Yang Zou,Wanglai Cen,Tingyu Zhu
Considering that nitrogen oxides (NO x ) and carbon monoxide (CO) usually meantime exist in industrial flue gas, it is meaningful to develop a collaborative control technology for the simultaneous purification of NO x and CO. In this work, the catalysts xCu-1V-5W/Ti were evaluated in the simultaneously selective catalytic reduction by NH 3 (NH 3 -SCR) and CO oxidation . The introduction of CuO provided the active sites for the oxidation of CO, while inhibited the NH 3 -SCR process and facilitated the generation of N 2 O by-product at high temperature. Accordingly, a catalyst coupling system was designed by employing 1V-5W/Ti and 2Cu-1V-5W/Ti catalysts in one reactor, and high NO conversion (>90 %) and CO removal efficiency (>80 %) could be simultaneously realized within 350–500 °C. This work would provide valuable insights for achieving simultaneous removal of NO x and CO using the catalyst coupling method.
研究领域:
环境催化
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大气污染控制
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化学工程
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Catalysts
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2022
·Vol. 12
·期 11
·1455
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IF 4.501
Ting Gao,Ke Zhang,Qiuhui Zhu,Qingyun Tian,Hui Wang,Wei Zhang,Jiangyushan Liang,Jingqi Lin,Ahmed A. Allam,Jamaan S. Ajarem,Peter K. J. Robertson,Chuanyi Wang
Photocatalysis is an effective technology for NO removal even at low concentrations in the ambient atmosphere. However, the low efficiency of this advanced process and the tendency of producing toxic byproducts hinder the practical application of photocatalysis. To overcome these problems, the Bi@Ba2TiO4/BaBi4Ti4O15photocatalytic composites were successfully prepared by a one-step hydrothermal method. The as-synthesized photocatalysts exhibited an efficient photocatalytic performance and generated low amounts of toxic byproducts. X-ray diffraction studies show that Bi3+is successfully reduced on the surface of Ba2TiO4/BaBi4Ti4O15(BT/BBT). After L-Ascorbic acid (AA) modification, the photocatalytic NO removal efficiency of Bi@Ba2TiO4/BaBi4Ti4O15is increased from 25.55% to 67.88%, while the production of the toxic byproductNO2is reduced by 92.02%, where the initial concentration of NO is diluted to ca. 800 ppb by the gas stream and the flow rate is controlled at 301.98 mL·min−1in a 150 mL cylindrical reactor. Furthermore, ambient humidity has little effect on the photocatalytic performance of theBi@Ba2TiO4/BaBi4Ti4O15, and the photocatalyst exhibits excellent reusability after repeated cleaning with deionized water. The improved photocatalytic effect is attributed to the addition of AA in BT/BBT being able to reduce Bi3+ions to form Bi nanoparticles giving surface plasmon effect (SPR) and generate oxygen vacancies (OVs) at the same time, thereby improving the separation efficiency of photogenerated carriers, enhancing the light absorption, and increasing the specific surface areas. The present work could provide new insights into the design of high-performance photocatalysts and their potential applications in air purification, especially for NO removal.Keywords:photocatalysis;BaBi4Ti4O15;surface plasmon effect;NO removal
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Catalysts
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2022
·Vol. 12
·期 5
·534
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IF 4.501
Zhaohui Teng,Shan Huang,Na Li,Qulan Zhou
Rice husk ash (RHA) has potential as a supporter of catalysts. In this research, we studied the activity and SO2tolerance of RHA-based Fe-Cu oxide in the reduction of NO by CO. Characterization methods were employed to study the properties of the catalysts and their SO2tolerance. Activity and SO2resistance were also tested at different temperatures. We recommend two catalysts with SO2resistance ability: Fe0.67Cu0.33/RHA (the highest catalytic activity) and Fe0.8Cu0.2/RHA. The NO removal rate hardly changed with the addition of SO2and was kept at about 100%. However, the CO conversion rate decreased with increasing SO2at the lower reaction temperatures, which may be due to the formation of sulfites. Fortunately, the deactivation was reversible and can be reduced with an increase in the reaction temperature. The results of our research may help promote the application of CO-SCR.Keywords:rice husk ash;Fe-Cu catalysts;NO reduction;SO2resistance;CO-SCR
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Materials Today Chemistry
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2022
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IF 7.613
T. Huang,Z. Yu,B. Yuan,L. Jiang,Y. Liu,X. Sun,P. Liu,W. Jiang,J. Tang
The presence of bacteria, existing as highly organized biofilm communities, in chronic non-healing wounds has been identified as a significant impediment for wound healing. Nanozymes , with unique antimicrobial mechanisms, as a new alternative for antibiotics, have the potential to synergize with nitric oxide (NO) with enhanced antibacterial and antibiofilm ability. However, the always-on state of nanozymes and the reactivity of NO limit their clinical applications. In this context, an intelligent and multifunctional Pd-MOF@PAzo@SNP nanoplatform was fabricated using UiO-66 as a palladium (Pd) nanozyme-loading vehicle, then a surface modification with photosensitive polyazobenzene (PAzo), and the adsorption of the NO donor sodium nitroprusside (SNP) via a host-guest interaction between β -cyclodextrin-modified hyaluronic acid ( β -CD-HA) and azobenzene. The activity of Pd-nanozyme was easily controlled via ultraviolet (UV) light, and its photosensitivity was regulated by changing the side-chain unit length of PAzo. Furthermore, NO was released in response to the UV irradiation and played a synergistic role with the peroxidase activity of Pd nanozyme, exhibiting excellent antibacterial and antibiofilm activity in the presence of 0.01 mM hydrogen peroxide (H 2 O 2 ). In vivo , Pd-MOF@PAzo@SNP accelerated the healing of a biofilm-infected diabetic wound by dispersing the biofilm, reducing bacterial burden, and promoting angiogenesis and collagen deposition. Overall, the nanoplatform provides a reliable and highly efficient strategy to develop an intelligent nanozyme synergy with NO therapy in chronic wound management.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Shoubing Chai,Yingjie Li,Wan Zhang,Zirui He
In carbonation stage of calcium looping process, NO could be reduced by CO using CaO as a catalyst, allowing simultaneous CO 2 and NO removal. However, to achieve efficient NO removal, the required CO/NO molar ratio in the carbonator is very high (up to 30:1), which leads to lots of unreacted CO in the exhaust gas. In this work, to maintain high efficiency of NO removal at low CO concentration in carbonator, Ce-doped CaO was employed to simultaneously enhance NO and CO 2 removal performance. The effects of Ce-doped CaO on simultaneous CO 2 and NO removal in bubbling fluidized bed reactor were investigated during the carbonation stage of calcium looping process. When the molar ratio of CO/NO is about 3.57:1, Ce-doped CaO obtains an 83% CO 2 capture efficiency and a 97% NO removal efficiency in 20 cycles in chemical reaction controlling stage. The average CO concentration in exhaust gas of Ce-CaO was reduced by 79% at the same NO removal efficiency as Mn-doped CaO. The presence of Ce 3+ makes the charge imbalance of the material, resulting in more charge transfer from the Ce-CaO surface to the molecules. The density functional theory reveals that Ce doping reduces the energy barriers of the conversion of NO to N 2 and the CO 2 adsorption, promoting the simultaneous NO/CO 2 removal in carbonation stage. Therefore, under a low molar ratio of CO/NO in carbonation stage of calcium looping, Ce considerably improves the simultaneous CO 2 and NO removal action of CO and CaO.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Qiuhui Zhu,Reshalaiti Hailili,Yue Xin,Yingtang Zhou,Yu Huang,Xinzhu Pang,Ke Zhang,Peter K.J. Robertson,Detlef W. Bahnemann,Chuanyi Wang
Developing full-spectrum responsive and efficient photocatalysts is still an important challenge in the field of photocatalytic treatment of trace environmental pollutants. Herein, full-spectrum Bi@Bi 2 Ti 2 O 7 with rich-oxygen vacancies (OVs) were fabricated via a one-pot hydrothermal method. The optimized composite photocatalyst exhibited a photocatalytic efficiency of 79 %, more than doubled higher than that of its counterpart, Bi 2 Ti 2 O 7 (31.79 %), for removing ppb-level NO under visible-near infrared (Vis-NIR) irradiation. The enhanced photocatalytic performance was attributed to the co-effect of Bi and OVs reveal by control experiments and theoretical calculations, which not only benefited the adsorption and photocatalytic activation of NO but broadened light absorption to near infrared region. Furthermore, the adsorption and photocatalytic conversion pathway of NO was explored by in situ DRIFTS, suggesting that NO + as intermediate species is crucial to improve the selectivity of NO converting to nitrate. This work provides a new perspective of constructing full-spectrum-driven photocatalysts for environment remediation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
·
IF 4.326
Shujun Sun,Jun Zhang,Changdong Sheng,Hui Zhong
A novel Na2SiO3/Fenton system was employed for NO removal from coal-fired flue gas in a bubble reactor. The NO removal efficiency of this system could reach 94.36% when the flue gas residence time was 3 s. The hydrolysis reaction of Na2SiO3 produced OH-, which made the solution alkaline, and the formation of iron-based colloids in the alkaline environment effectively catalyzed the generation of free radicals from H2O2, O2•– radicals, which was the main reason for the increase of NO removal efficiency. The reaction of H2O2 catalyzed by iron-based colloids increased the solution pH, which could not only further improve the NO removal efficiency but also enhance the useless decomposition of H2O2. Na2SiO3 could buffer the solution pH, which weakened the ineffective decomposition of H2O2 and prolonged the effective denitrification time. The X-ray diffraction and ion chromatography analysis showed that NO was finally converted to NO3– and NO2–.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Shujun Sun,Jun Zhang,Changdong Sheng,Hui Zhong
Currently, most advanced oxidation denitrification technologies require long flue gas residence time to obtain ideal NO removal efficiency. The NaOH-catalyzed H 2 O 2 system proposed in this paper can obtain 98% NO removal efficiency under the condition of flue gas residence time of 3 s. The mechanism of NO removal and H 2 O 2 decomposition to O 2 were proposed. It was confirmed with ESR (Electron-spin-resonance), inhibitor experiments and UV-Vis spectrophotometer that the main group in the reaction process was·O 2 - radicals, which reacted with NO to form ONOO - , and ONOO - would be gradually transformed into NO 3 - and NO 2 - in the air. The effect of some primary factors on the NO removal efficiency and the percentage of H 2 O 2 decomposition to O 2 were also investigated. The increase of initial pH has a positive effect on NO removal, while the promotion of NO removal by increasing H 2 O 2 concentration and reaction temperature is limited and the increase of NO has a negative effect on NO removal. Initial pH has a dual impact on the percentage of H 2 O 2 decomposition to O 2 , H 2 O 2 concentration and reaction temperature promote the decomposition of H 2 O 2 to O 2 , while NO concentration has an inhibiting effect on it.
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Journal of Cleaner Production
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2021
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IF 9.297
Wenqing Cheng,Liujun Pei,Muhammad Asad Saleem,Lei Zhu,Jiping Wang
Clean dyeing technologies for polyester textiles, particularly waterless dyeing, have been studied extensively in recent decades. In the present work, a new waterless dyeing technology, the silicone medium dyeing, for polyester textiles had been investigated. The dyeing process of polyester textile in the silicone medium was optimized by determining the dyeing temperature, holding time, type and dosage of dye accelerator. The dye uptake of disperse dye and the fastness properties of the dyed polyester were equivalent to those of conventional water-bathed dyeing. After dyeing, polyester textile had a better color levelness. From the TGA and XRD results, it can be proved that silicone medium has no adverse effects on the fiber and can be used as a dyeing medium. The influence of the increase of halogen in the diazotized component on the affinity, dye uptake, diffusion coefficient , and other parameters was obtained by analyzing the dye uptake of C.I. Disperse Orange 44 and C.I. Disperse Yellow 163. These parameters formulate guidelines for the selection of disperse dyes for silicone medium dyeing system. To verify the feasibility of industrialization, pilot-scale dyeing was carried out. The results showed that, as compared to aqueous dyeing, higher colorfastness and better color levelness were obtained from silicone media. Therefore, this eco-friendly dyeing technology has considerable potential to become a mainstream dyeing method in the foreseeable future.
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