INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
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
·
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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Catalysts
·
2022
·Vol. 12
·期 5
·534
·
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
·
2022
·
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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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 41
·2205569
·
IF 19.924
Chunpeng Bai,Shiying Fan,Xinyong Li,Zhaodong Niu,Jing Wang,Zhiyuan Liu,Dongke Zhang
Hollow nanoreactors show great potential in catalysis due to the void-confinement effect. Yet few studies have investigated the void-confinement effect of hollow nanoreactors on intermediates. Herein, electrochemical NO reduction to NH 3 (ENOR) is used as a probe reaction to study the void-confinement effect of hollow Cu 2 O@CoMn 2 O 4 nanoreactors on intermediates. Combined with the results of catalytic activity, H 2 -treated in situ diffusion Fourier transform infrared spectroscopy and the finite-element method simulation confirm that the void-confinement effect on the intermediate is the main reason for enhanced ENOR efficiency. Additionally, theoretical calculations also show that the Cu sites of Cu 2 O@CoMn 2 O 4 nanoreactors are favorable for the formation of *NOH intermediates. This work not only gives an insight into void-confinement effect of hollow nanoreactors on intermediates but also provides a valuable strategy for improving ENOR.
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Engineering
·
2023
·
IF 12.8
Xiaoyu Li,Xiaoshu Lv,Jian Pan,Peng Chen,Huihui Peng,Yan Jiang,Haifeng Gong,Guangming Jiang,Li'an Hou
Photocatalysis offers a sustainable avenue for the oxidative removal of low concentrations of NO x from the atmosphere. Layered double hydroxides (LDHs) are promising candidate photocatalysts owing to their unique layered and tunable chemical structures, and the abundant hydroxide (OH − ) moieties on their surfaces that are hydroxyl radical ( • OH) precursors. However, inferior charge separation and limited active sites on an LDH hinder its practical applications. Herein, we developed a facile N 2 H 4 -driven etching (et) approach that introduces dual Ni 2+ and OH − vacancies (Ni v and OH v ) into NiFe-LDH nanosheets (referred to as NiFe-LDH-et) that facilitate improved charge-carrier separation and the formation of active Lewis acidic sites (Fe 3+ and Ni 2+ exposed at OH v ). In contrast to inert pristine LDH, NiFe-LDH-et actively removes NO when illuminated with visible light. Specifically, Ni 76 Fe 24 -LDH - et etched in 1.50 mmol·L −1 N 2 H 4 solution removes 32.8% of the NO from continuously flowing air (NO-feed concentration: ∼500 parts per billion (ppb)) when illuminated with visible light, thereby outperforming most reported catalysts. Experimental and theoretical data reveal that the dual vacancies promote the production of reactive oxygen species ( • O 2 − and • OH) and the adsorption of NO on the LDH. In-situ spectroscopy revealed that NO is preferentially adsorbed at Lewis acidic sites, particularly exposed Fe 3+ sites, and then converted into NO + that is subsequently oxidized to NO 3 − without the formation of any of the more toxic NO 2 intermediate, thereby alleviating risks associated with its production and emission.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 43
·19974-19982
·
IF 3.3
Hao Fan,Qin Peng,Zhenxing Shen,Xuefeng He,Yiming Yang
Nitric oxide (NO), a major atmospheric pollutant and a precursor to haze, can be removed using the denitration catalyst. Mn and Ni are commonly used as denitration catalyst additives owing to their adsorption abilities for NO and ammonia (NH3). In this study, we synthesized Mn- and Ni-loaded Pt-modified sulfated cerium oxide (PtSCe) catalysts using an impregnation method and explored the effects of these elements. The results revealed that the two elements had contrasting effects on the denitration activity of the catalysts. Mn improved the water vapor and sulfur resistance of the PtSCe sample by increasing the concentration of weak acid sites, enhancing the redox ability, and increasing the content of surface-adsorbed oxygen. The elevation in oxygen vacancies, stimulated by the presence of Ce3+ and Mn3+, swiftly replenished the reactive oxygen species, thereby sustaining the high denitration efficiency of the MnPt/SCe sample. Active sites on the catalyst surface included NH3 adsorbed on Lewis acid sites, NH4+, and –NH2, along with bridging, monodentate, and bidentate nitrate groups. Regarding the catalyst reaction mechanism, we determined that the selective catalyst reduction of NH3-SCR over MnPt/SCe followed both the Eley–Rideal and Langmuir–Hinshelwood mechanisms. These findings offer crucial insights into the intricate relationship between metals, sulfates, and carrier molecules, thus providing implications for future catalyst design.
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STARCH-STARKE
·
2021
·
IF 2.741
Meidong Li,Xiufang Huang,Qin Zhang,Yifeng Zhou,Kai Luo
Four new types of water-soluble polysaccharides are isolated from Cardamine hupingshanensis . Herein, this study examines C. hupingshanensis polysaccharide no. 2 (CHP-2) with a molecular weight of 21.75 kDa. Analysis revealed that CHP-2 is composed of d -glucuronic acid, d -galacturonic acid, glucose, galactose, and L-arabinose. It is speculated that the main connecting bond is →4)-α-D-Glc(p)-(1→), →t)-α-D-Glcp-(1→). Through perfusion experiments using streptozotocin-induced diabetic rats, oral CHP-2 solution is found to significantly reduce food intake, water intake, and fasting blood glucose levels, while increasing the weights of rats. In addition, CHP-2 significantly reduces the serum and liver malondialdehyde contents and increases the activity of the corresponding antioxidant enzymes. Moreover, the effect elicited by the CHP-2 solution is similar to that of phenformin hydrochloride solution. Hence, the results of this study suggest that CHP-2 exhibits blood sugar-lowering and anti-oxidation effects.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 36
·2103949
·
IF 18.808
Liangbin Xiong,Jiashuai Li,Feihong Ye,Haibing Wang,Yaxiong Guo,Xing Ming,Qingyun Chen,Shaoan Zhang,Ruihao Xie,Zhanxu Chen,Yang Lv,Guangqi Hu,Yingji He,Guojia Fang
SnO 2 compact layer (c-SnO 2 ) frequently suffers from degradation in high temperature processes (HTP) such as crack, worse interfacial contact, and electrical properties, that is, annealing effect. To solve this problem, a kind of bifunctional SnO 2 colloid is developed by using small molecular oxalate whose organic components can be removed clearly at a low temperature process (LTP). The c-SnO 2 and SnO 2 mesoporous layer (m-SnO 2 ) derived from the fresh and aged sols with the same colloid show no annealing effect, decreasing oxygen vacancy, and adsorbing water on increasing annealing temperature. The champion devices of LTP and HTP SnO 2 planar perovskite solar cells (PSCs) achieve, respectively, stabilized photoelectric conversion efficiencies (PCEs) of 20.74% and 20.70%. In contrast, the performance of champion devices of their mesoporous counterparts is significantly improved, showing nearly hysteresis free character with stabilized PCEs of 22.40% and 22.37%, respectively. The inclusion of m-SnO 2 plays a role of an energy bridge, improving electrons collection efficiency, which is supported by photoluminescence and transient photoluminescence characterizations. HTP SnO 2 mesoporous PSCs can preserve 97.6% and 80% of their initial PCEs after aging for 25 weeks and 8-h irradiated/16-h dark cycle within 104 h. The high stability of HTP SnO 2 PSCs may ascribe to low oxygen vacancy and adsorbed water of HTP SnO 2 .
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Guanyu Liu,Huiyun Xia,Yanhui Niu,Xu Zhao,Gengtong Zhang,Lifang Song,Huaxin Chen
Practical significance in terms of the long-term effective application of photocatalytic coatings is greatly challenged by its easy pollution and poor self-cleaning performance. In this paper, a self-cleaning photocatalytic WO 3 -TiO 2 nanorod (MWT) /PDMS building coating (MWT coating) was prepared by spraying methods. The surface hierarchical structure fabricated by MWT and PDMS was a crux to construct a superhydrophobic surface, which endowed MWT coating with self-cleaning performance. Besides, the MWT coating exhibited prominent durability and antifouling property after 450 d practical application of the external wall. The excellent self-cleaning property of the coating was confirmed by the removal and resistance to the adhesion of powder particles. Meanwhile, the photocatalytic properties of MWT endowed MWT coating with the ability to degrade organic pollutants on the surface. The color difference of the coating polluted by methyl red was only 1.18 and 4.77 after 24 h UV and visible irradiation, respectively. This mutual benefit effect of self-cleaning and photocatalysis was also reflected in the degradation of NO. In the first five cycles, the degradation efficiency of NO decreased by 4.74% gradually under visible light due to the adhesion of oxidation products, and most of the MWT on the coating surface was regenerated after flushing, the PCD efficiency increased by 3.71%. Furthermore, after 30 days of outdoor weathering test, the PCD efficiency of MWT coating decreased by 11.74% and 12.05% under UV and visible light, respectively, which lays a foundation for the long-term effectiveness of the MWT coating in the process of use.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Liam John France,Wan Li,Yanke Zhang,Wentao Mu,Zhihang Chen,Junjun Shi,Qiang Zeng,Xuehui Li
A series of Fe-Zr mixed-metal oxides were prepared and examined for the simultaneous reduction of NO and SO 2 with CO. The catalyst containing 40 mol% exhibited near-complete conversion of both pollutants at a minimum temperature of 350 °C and a GHSV of 90,000 h −1 . The addition of Fe 3+ to ZrO 2 decreased the crystallinity of the latter phase and significantly enhanced surface area. Concentrations of 30 mol% or greater produced segregated FeO x phases, which affected catalytic performance in distinctly different ways: supported Fe 3+ (30 mol%) possessed similar activity to doped Fe 3+ ; α-Fe 2 O 3 (50 mol%) inhibited activity due to its’ lower reducibility; an amorphous phase (40 mol%) promoted iron-weighted areal activity. A complete identification of the ambiguous component was not successfully established, but the obtained properties revealed that it exhibited weaker interaction with the support and had a size greater than that of oligomeric-Fe 2 O 3 yet smaller than 3 nm.
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Molecular Medicine Reports
·
2021
·Vol. 24
·期 4
·1-8
·
IF 2.952
Hongwei Shi,Qingfu Zeng,Yunjie Wei,Hong Yang,Heng Tang,Dan Wang,Peng Pu,Rui Feng
Pirarubicin (THP), one of the anthracycline anticancer drugs, is widely used in the treatment of various types of cancer, but its cardiotoxicity cannot be ignored. Canagliflozin, the first sodium‑glucose co‑transporter‑2 inhibitor approved by the USA FDA, has been shown to have a significant effect on cardiovascular damage caused by diabetes. However, it has not been reported whether it can resist THP‑induced cardiotoxicity. The aim of the present study was to investigate the effect of canagliflozin on THP‑induced cardiotoxicity and its mechanism. A rat model of cardiotoxicity induced by THP was established and canagliflozin treatment was performed at the same time. The changes of electrocardiography, cardiac coefficient and echocardiogram were observed. The levels of lactate dehydrogenase, brain natriuretic peptide, creatine kinase MB, cardiac troponin T, superoxide dismutase (SOD) and malondialdehyde were detected. The expression of SOD2, NADPH oxidase 2, pro/cleaved‑caspase‑ and Bcl‑2/Bax were evaluated by western blotting. The primary culture of cardiomyocytes was prepared to explore the effect in vitro. After eight weeks, a series of cardiotoxicity manifestations were observed in THP rats. However, canagliflozin treatment had no significant effect on the above adverse reactions. Similarly, further studies showed that canagliflozin had no significant effect on THP‑induced cardiomyocyte injury in vitro. The present study showed that there was no significant protective effect of canagliflozin on THP‑induced cardiotoxicity and cardiomyocyte injury.
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