通讯机构：
[Sun, LB ] N;[Yan, JT ] W;Nanjing Tech Univ, Coll Chem Engn, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, State Key Lab Mat Oriented Chem Engn, 30 South Puzhu Rd, Nanjing 211816, Peoples R China.;Wuhan Polytech Univ, Coll Chem & Environm Engn, Wuhan 430023, Peoples R China.
关键词：
Basic sites;Ca single atoms;Metal-organic frameworks;Single-atom solid base catalysts
摘要：
Considerable attention has been paid to the preparation of single-atom solid base catalysts (SASBCs) owing to their high activity and maximized utilization of basic sites. At present, the reported fabrication methods of SASBCs, such as two-step reduction strategy and sublimation capture strategy, require high temperature. Such a high activation temperature is easy to cause the sublimation loss of alkali or alkaline earth metal atoms and destructive to the support structure. Herein, a new SASBC, Ca(1)/UiO-67-BPY, is fabricated, in which the alkaline earth metal Ca sites are immobilized onto N-rich metal-organic framework UiO-67-BPY at room temperature. The results show that the atomic configuration of Ca single atoms is coordinated by two N atoms in the framework. The obtained Ca SASBC possesses ordered structure and exhibits high product yield of 87.2% in the Knoevenagel reaction between benzaldehyde and malononitrile. Furthermore, thanks to the Ca single atoms sites anchored on UiO-67-BPY, the Ca(1)/UiO-67-BPY catalyst also shows good stability during cycles. This work might offer new insight in designing SASBCs for different base-catalyzed reactions.
摘要：
The efficient, safe and eco-friendly disposal of the chromium-containing sludge (CCS) has attracted an increasing concern. In this study, Co-processing of CCS was developed via employing sintering and ironmaking combined technology for its harmless disposal and resource utilization . Crystalline phase and valence state transformation of chromium (Cr), technical feasibility assessment, leaching risk, characteristics of sintered products, and pollutant release during CCS co-processing were investigated through a series of laboratory-scale sintering pot experiments and large scale industrial trials. The results showed that the content of Cr(VI) in sintered products first increased then decreased with increasing temperature ranges of 300 °C–800 °C, and reached a maximum of 2189.64 mg/kg at 500 °C. 99.99% of Cr(VI) can be reduced to Cr(III) at above 1000 °C, which was attributed to the transformation of the Cr(VI)-containing crystalline phases (such as, MgCrO 4 and CaCrO 4 ) to the (Mg, Fe 2+ )(Cr, Al, Fe 3+ ) 2 O 4 . The industrial trial results showed that adding 0.5 wt‰ CCS to sintering feed did not have adverse effects on the properties of the sintered ore and the plant's operating stability. The tumbler index of sinter was above 78% and the leaching concentrations of TCr (0.069 mg/L) was significantly lower than the Chinese National Standard of 1.0 mg/L (GB5085.3–2007). The TCr contents of sintering dust and blast furnace gas (BFG) scrubbing water were less than 0.19 wt‰ and 0.11 mg/L, respectively, which was far below the regulatory limit (1.5 mg/L, GB13456-2012). The mass balance evaluation results indicated that at least 89.9% of the Cr in the CCS migrated into the molten iron in the blast furnace (BF), which became a useful supplement to the molten iron. This study provided a new perspective strategy for the safe disposal and resource utilization of CCS in iron and steel industry .
The efficient, safe and eco-friendly disposal of the chromium-containing sludge (CCS) has attracted an increasing concern. In this study, Co-processing of CCS was developed via employing sintering and ironmaking combined technology for its harmless disposal and resource utilization . Crystalline phase and valence state transformation of chromium (Cr), technical feasibility assessment, leaching risk, characteristics of sintered products, and pollutant release during CCS co-processing were investigated through a series of laboratory-scale sintering pot experiments and large scale industrial trials. The results showed that the content of Cr(VI) in sintered products first increased then decreased with increasing temperature ranges of 300 °C–800 °C, and reached a maximum of 2189.64 mg/kg at 500 °C. 99.99% of Cr(VI) can be reduced to Cr(III) at above 1000 °C, which was attributed to the transformation of the Cr(VI)-containing crystalline phases (such as, MgCrO 4 and CaCrO 4 ) to the (Mg, Fe 2+ )(Cr, Al, Fe 3+ ) 2 O 4 . The industrial trial results showed that adding 0.5 wt‰ CCS to sintering feed did not have adverse effects on the properties of the sintered ore and the plant's operating stability. The tumbler index of sinter was above 78% and the leaching concentrations of TCr (0.069 mg/L) was significantly lower than the Chinese National Standard of 1.0 mg/L (GB5085.3–2007). The TCr contents of sintering dust and blast furnace gas (BFG) scrubbing water were less than 0.19 wt‰ and 0.11 mg/L, respectively, which was far below the regulatory limit (1.5 mg/L, GB13456-2012). The mass balance evaluation results indicated that at least 89.9% of the Cr in the CCS migrated into the molten iron in the blast furnace (BF), which became a useful supplement to the molten iron. This study provided a new perspective strategy for the safe disposal and resource utilization of CCS in iron and steel industry .
摘要：
The circular saw blade, which is mainly composed of carbon steel, is used to cut the stone. However, the carbon steel is easily corroded in stone processing wastewater, shortening its lifespan. In this study, a new composite inhibitor of sodium nitrite, sodium molybdate, sodium silicate, sodium tungstate, and sodium citrate was investigated firstly, and then, its inhibition efficiency for carbon steel in stone processing wastewater was explored using electrochemical measurements and weight loss measurements. The results showed that the composite inhibitor as a mixed-type inhibitor displayed good inhibitory performance. Surface analysis including scanning electron microscope, atomic force microscope, X-ray photoelectron spectroscopy analysis, and contact angle test further revealed the form of protection of the steel surface by composite corrosion inhibitors. The prepared composite inhibitor exhibited excellent corrosion resistance for carbon steel in stone processing wastewater, and it is believed that the composite inhibitor has certain application potential in industries.
摘要：
<jats:title>Abstract</jats:title><jats:p>In this study, the effect of biochar supported nano‐zero valent iron (nZVI/BC) on anaerobic digestion of sulfate wastewater including methane yield, total volatile fatty acids, COD balance, sulfur balance, variation of iron (Fe<jats:sup>2+</jats:sup>) and microbial community structure was investigated by a batch‐scale experiment. The results showed that nZVI/BC could effectively maintain the stability of anaerobic digestion even at a high sulfate concentration. At SO<jats:sub>4</jats:sub><jats:sup>2−</jats:sup>/COD = 0.1 with 2 g nZVI/BC, the maximum methane yield (<jats:italic>B</jats:italic><jats:sub>max</jats:sub>) and maximum methane production rate (<jats:italic>R</jats:italic><jats:sub>max</jats:sub>) were obtained with a value of 3940.6648 mL and 553.6266 mL/day, respectively. When the SO<jats:sub>4</jats:sub><jats:sup>2−</jats:sup>/COD ratio was increased from 0.1 to 2, the ratio of COD converting to CH<jats:sub>4</jats:sub> was decreased from 80.85% to 20.16%, while the ratio of COD used for SO<jats:sub>4</jats:sub><jats:sup>2−</jats:sup> reduction was increased from 8.79% to 77.96%. Meanwhile, nZVI/BC could enrich the hydrogentrophic Methanobacterium especially Methanobacterium with an average relative abundance of 75.86%.</jats:p>
通讯机构：
[Likun Li; Lei Zhang] A;Authors to whom correspondence should be addressed.<&wdkj&>China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>School of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China
通讯机构：
[Likun Li; Lei Zhang] A;Authors to whom correspondence should be addressed.<&wdkj&>China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>School of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China
关键词：
acidic wastewater;heavy metal ions;pyridine-modified chitosan adsorbent;adsorption mechanism
通讯机构：
[Likun Li] C;[Lei Zhang] S;China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China<&wdkj&>School of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China
通讯机构：
[Yi Wang] K;Key Laboratory for Green Chemical Process of Ministry of Education, Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
作者机构：
[Guangyuan He] The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, The Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science & Technology, Wuhan 430074, China;These authors contributed equally to this work.;Hubei Technical Engineering Research Center for Chemical Utilization and Engineering Development of Agricultural and Byproduct Resources, School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China;Authors to whom correspondence should be addressed.;[Min Tu] Hubei Technical Engineering Research Center for Chemical Utilization and Engineering Development of Agricultural and Byproduct Resources, School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China<&wdkj&>These authors contributed equally to this work.
通讯机构：
[Yin Li; Junli Chang] T;The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, The Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science & Technology, Wuhan 430074, China<&wdkj&>Authors to whom correspondence should be addressed.
摘要：
<jats:p>Cereal crops are of great importance in the development of human civilization and fall into two groups, major crops and minor crops [...]</jats:p>
通讯机构：
[He, GY; Li, Y ] H;[Xiong, ZY ] I;Huazhong Univ Sci & Technol, Coll Life Sci & Technol, Key Lab Mol Biophys, Genet Engn Int Cooperat Base,ChineseMinist Sci & T, Wuhan, Peoples R China.;Inner Mongolia Univ, Sch Life Sci, Lab Forage & Endem Crop Biol, Minist Educ, Hohhot, Peoples R China.
关键词：
drought stress;gene expression regulation;omics analyses;salt and alkaline stress;sorghum;temperature stress
摘要：
Sorghum (Sorghum bicolor L. Moench), a monocot C4 crop, is an important staple crop for many countries in arid and semi-arid regions worldwide. Because sorghum has outstanding tolerance and adaptability to a variety of abiotic stresses, including drought, salt, and alkaline, and heavy metal stressors, it is valuable research material for better understanding the molecular mechanisms of stress tolerance in crops and for mining new genes for their genetic improvement of abiotic stress tolerance. Here, we compile recent progress achieved using physiological, transcriptome, proteome, and metabolome approaches; discuss the similarities and differences in how sorghum responds to differing stresses; and summarize the candidate genes involved in the process of responding to and regulating abiotic stresses. More importantly, we exemplify the differences between combined stresses and a single stress, emphasizing the necessity to strengthen future studies regarding the molecular responses and mechanisms of combined abiotic stresses, which has greater practical significance for food security. Our review lays a foundation for future functional studies of stress-tolerance-related genes and provides new insights into the molecular breeding of stress-tolerant sorghum genotypes, as well as listing a catalog of candidate genes for improving the stress tolerance for other key monocot crops, such as maize, rice, and sugarcane.
摘要：
本文通过3,3′-((乙基-1,2-二基双((吡啶-2-甲基)杂氮二基))双亚甲基)二(2-羟基-5-甲基苯甲醛)(H2L)和丙二胺在金属离子存在条件下的缩合反应, 得到了一个新型3-甲基吡啶悬臂Cu(II)-Zn(II)异双核配合物, 并通过红外光谱、紫外光谱、电喷雾质谱、X射线单晶衍射等手段对其结构进行了表征。单晶衍射结果表明该配合物属于六方晶系, P63/m空间群, a=1.982 18(17) nm,b=1.982 18(17) nm,c=1.839 4(2) nm, 分子式为C37H41CuN6O4Zn。金属中心Cu(II)和Zn(II)由两个酚氧原子和一个醋酸根桥联, 它们的配位环境都可以近似地看作为四方锥结构, Cu(II)和Zn(II)之间的距离是0.289 7 nm。本文还利用循环伏安实验和黏度实验的方法对该配合物与小牛胸腺DNA(CT-DNA)的相互作用模式进行了研究, 结果表明该配合物与CT-DNA的结合方式为弱的插入模式, 其相应的结合活性为6.92×103 mol/L。 A new 3-methylpyridyl pendant-arms Cu(II)-Zn(II) hetero-binuclear complex was synthesized by condensation reaction of 3,3′-((ethane-1,2-diylbis((pyridin-2-ylmethyl)azanediyl))bis(methylene))bis(2-hydroxy-5-methylbenzaldehyde) (H2L) and propane diamine in the presence of metal ions. The structure was characterized by IR spectroscopy, UV-Vis spectroscopy, ES-MS spectroscopy and X-ray single-crystal diffraction. The crystal structure reveals that the complex crystallizes in hexagonal, space group P63/m, with a=1.982 18(17) nm, b=1.982 18(17) nm and c=1.839 4(2) nm. The coordination environment of Zn(II) and Cu(II) in complex can be described as approximately square pyramid, where the apical positions are occupied by acetate radical. Two metal centers are equivalently bridged by the phenolic oxygens and an acetate radical with the intermetallic separation of 0.289 7 nm. The interaction between the complex and calf thymus DNA (CT-DNA) was measured by cyclic voltammetry and viscosity studies, which shows a weak binding activity of 6.92×103mol/L.
通讯机构：
[Li, LK ] G;[Zhang, L ] W;Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Peoples R China.;Guangdong Acad Sci, China Ukraine Inst Welding, Guangzhou 510650, Peoples R China.
关键词：
Stone processing wastewater;Benzotriazole;Corrosion inhibitor;Electrochemical tests;Corrosion mechanism
摘要：
The cutting saw blade with diamond blade and carbon steel matrix is widely used in stone cutting because of its high strength, impact resistance and good thermal stability. However, the carbon steel matrix is easy to corrode in the circulating cooling water, which shortens its service life. In this study, a new highly efficient benzotriazole-based (BMN) composite inhibitor was synthesized and investigated against the corrosion of carbon steel in stone processing wastewater. The corrosion inhibition properties and mechanism of prepared BMN for carbon steel in real stone processing wastewater were evaluated and deduced using the experimental weight loss, electrochemical and surface morphology characterization techniques. Weight loss methods results showed that a high inhibition efficiency of 99.59% in stone processing wastewater was achieved at ambient temperature, with the stirring speed 200 rpm, the immersion time 7 d, and the BMN concentration is 50 mL·L –1 . Electrochemical impedance spectroscopy indicated that resistance from the surface films ( R 2 ) and charge transfer resistance ( R 3 ) were enhanced with increase in BMN concentration. Polarisation results revealed the BMN acted as an anodic inhibitor, owing to the addition of BMN resulted in the significant change of anodic Tafel slopes (β a ). Scanning electron microscopy results indicated BMN formed a protective film on the surface of carbon steel through adsorption. In short, the prepared BMN composite inhibitor exhibited superior anti-corrosion performance for saw blade corrosion in stone processing wastewater, which had great application potential in industries.
The cutting saw blade with diamond blade and carbon steel matrix is widely used in stone cutting because of its high strength, impact resistance and good thermal stability. However, the carbon steel matrix is easy to corrode in the circulating cooling water, which shortens its service life. In this study, a new highly efficient benzotriazole-based (BMN) composite inhibitor was synthesized and investigated against the corrosion of carbon steel in stone processing wastewater. The corrosion inhibition properties and mechanism of prepared BMN for carbon steel in real stone processing wastewater were evaluated and deduced using the experimental weight loss, electrochemical and surface morphology characterization techniques. Weight loss methods results showed that a high inhibition efficiency of 99.59% in stone processing wastewater was achieved at ambient temperature, with the stirring speed 200 rpm, the immersion time 7 d, and the BMN concentration is 50 mL·L –1 . Electrochemical impedance spectroscopy indicated that resistance from the surface films ( R 2 ) and charge transfer resistance ( R 3 ) were enhanced with increase in BMN concentration. Polarisation results revealed the BMN acted as an anodic inhibitor, owing to the addition of BMN resulted in the significant change of anodic Tafel slopes (β a ). Scanning electron microscopy results indicated BMN formed a protective film on the surface of carbon steel through adsorption. In short, the prepared BMN composite inhibitor exhibited superior anti-corrosion performance for saw blade corrosion in stone processing wastewater, which had great application potential in industries.
