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Ag-SiO2-TiO2纳米包装对新鲜绿竹笋储藏品质的影响 认领 引用 被引量:9
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作者 张冬梅 王素雅 +2 位作者 杨茉 王瓅 周芹芹 《食品与发酵工业》 CAS CSCD 北大核心 2020年第15期147-153,共7页
在4℃,相对湿度85%条件下,以感官评分初步评判绿竹笋的储藏期限,结合亮度,失重率,呼吸强度,总酸,纤维素含量,木质素含量,亚硝酸盐含量及微生物数量等指标评价保鲜效果。结果表明:无包装绿竹笋储藏期为12 d,普通真空包装绿竹笋的储藏期为... 在4℃,相对湿度85%条件下,以感官评分初步评判绿竹笋的储藏期限,结合亮度,失重率,呼吸强度,总酸,纤维素含量,木质素含量,亚硝酸盐含量及微生物数量等指标评价保鲜效果。结果表明:无包装绿竹笋储藏期为12 d,普通真空包装绿竹笋的储藏期为16 d,纳米真空包装的绿竹笋可储藏20 d。储藏第20天时,Ag-SiO 2-TiO 2纳米包装绿竹笋的感官评分为75.25分,亮度值为86.85,总酸含量为0.54 g/kg,纤维素含量为2.96 mg/g,木质素含量为0.72 mg/g。在4℃条件下,纳米真空包装处理可以保证绿竹笋的良好感官品相和可食用性,延长绿竹笋的储藏期限。因此,Ag-SiO 2-TiO 2纳米材料真空包装处理是一种良好的绿竹笋贮藏保鲜方法。 展开更多
关键词 新鲜绿竹笋 Ag-SiO 2-TiO 2 纳米包装袋 储藏品质
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TiO_2-K_2SiO_3无机涂层对空间材料Ag的防护行为研究 认领 引用 被引量:3
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作者 张蕾 严川伟 +2 位作者 屈庆 童靖宇 曹楚南 《化学学报》 SCIE CAS 北大核心 2003年第9期1369-1374,共6页
在微波电离型原子氧 (AO)源地面模拟设备中对空间材料Ag及TiO2 K2 SiO3 无机涂层进行原子氧剥蚀效应试验 .用扫描电镜 (SEM)、光电子能谱 (XPS)、红外光谱 (FT IR)、X射线衍射光谱 (XRD)和LAMBDA 9分光光度计 ,对在模拟原子氧(AO)环境... 在微波电离型原子氧 (AO)源地面模拟设备中对空间材料Ag及TiO2 K2 SiO3 无机涂层进行原子氧剥蚀效应试验 .用扫描电镜 (SEM)、光电子能谱 (XPS)、红外光谱 (FT IR)、X射线衍射光谱 (XRD)和LAMBDA 9分光光度计 ,对在模拟原子氧(AO)环境中Ag及在其表面涂覆的无机涂层 ,所发生的侵蚀与防护作用进行了表征研究 .AO对Ag表现了较严重的侵蚀作用 ,原来光亮如镜的表面形貌变得粗糙 ,且失去光泽 .而所施用的TiO2 K2 SiO3 无机涂层 ,经AO辐照后 ,表面形貌则变化甚少 .实验表明 ,该涂层对AO辐照有较强的防护效果、较好的空间稳定性 (AO辐照前后Δαs≈ 0 .0 2 4) ,能阻止AO对基材的侵蚀 . 展开更多
关键词 TiO2-K2SiO3 无机涂层 空间材料 Ag 防护行为 原子氧 侵蚀 空间稳定性
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纳米Ag—TiO_2/SiO_2薄膜催化剂的制备及其性能研究 认领 引用 被引量:4
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作者 刘丽秀 何爱江 俞慧玲 《资源开发与市场》 CAS CSSCI 2008年第7期591-593,F0004,共3页
以硅胶为载体,采用溶胶凝胶—光还原法制备了掺杂Ag的TiO2薄膜催化剂(Ag—TiO2/SiO2);以甲基橙为目标降解物,对其光催化活性进行了考察。实验结果表明,Ag改性的TiO2/SiO2薄膜光催化性能是未改性催化剂性能的2.06倍。以XRD、SEM、BET等... 以硅胶为载体,采用溶胶凝胶—光还原法制备了掺杂Ag的TiO2薄膜催化剂(Ag—TiO2/SiO2);以甲基橙为目标降解物,对其光催化活性进行了考察。实验结果表明,Ag改性的TiO2/SiO2薄膜光催化性能是未改性催化剂性能的2.06倍。以XRD、SEM、BET等手段进行表征,结果表明Ag的掺杂会促进薄膜催化剂中的TiO2由锐钛型向金红石型转变,同时Ag对电子的捕获使电子—空穴对有效分离,导致了其催化活性的提高。 展开更多
关键词 AgTiO2/SiO2薄膜 光催化降解 甲基橙
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Ag+/TiO2/SiO2纳米复合材料的制备及抗变色性能、抑菌性能研究 认领 引用 被引量:5
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作者 秦汤 孙宏浩 《化工新型材料》 CAS CSCD 北大核心 2019年第9期122-126,共5页
以TiO2为前驱体,采用液相沉淀法成功制备了Ag+/TiO2/SiO2纳米复合材料。考察了正硅酸四乙酯(TEOS)加入量对复合材料粒径和白度的影响,并对复合材料的抗变色性和抗菌性能进行了研究。通过改变TEOS加入量,优化了SiO2外壳的厚度,使Ag+/TiO2... 以TiO2为前驱体,采用液相沉淀法成功制备了Ag+/TiO2/SiO2纳米复合材料。考察了正硅酸四乙酯(TEOS)加入量对复合材料粒径和白度的影响,并对复合材料的抗变色性和抗菌性能进行了研究。通过改变TEOS加入量,优化了SiO2外壳的厚度,使Ag+/TiO2/SiO2纳米复合材料具有较小的粒径,同时增加了复合材料的抗变色性能和抑菌性能。抑菌性能测试表明,Ag+/TiO2/SiO2纳米复合材料对大肠杆菌(E.coli)、金黄色葡萄球菌(S.aureus)和白色念珠菌(C.albicans)具有较强的抑菌作用,达到99%抗菌率的最小浓度分别是55mg/L、75mg/L和65mg/L。 展开更多
关键词 Ag+/TiO2/SiO2纳米复合材料 液相沉淀法 抗变色性 抑菌性能
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SiO_2负载Ag-TiO_2光降解催化剂的制备及性能研究 认领 引用 被引量:2
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作者 樊国栋 张国贤 冯昕钰 《陕西科技大学学报(自然科学版)》 2016年第6期64-70,共7页
以钛酸丁酯为钛源、正硅酸乙酯为硅源、硝酸银为Ag源,采用溶胶-凝胶法制备Ag掺杂TiO_2负载型催化剂x%Ag-TiO_2/SiO_2(x=0.5~3.0).通过X射线衍射(XRD)、场发射扫描电镜(FE-SEM)、透射电子显微镜(TEM)、傅里叶红外光谱仪(FT-IR)... 以钛酸丁酯为钛源、正硅酸乙酯为硅源、硝酸银为Ag源,采用溶胶-凝胶法制备Ag掺杂TiO_2负载型催化剂x%Ag-TiO_2/SiO_2(x=0.5~3.0).通过X射线衍射(XRD)、场发射扫描电镜(FE-SEM)、透射电子显微镜(TEM)、傅里叶红外光谱仪(FT-IR)、X射线光电子能谱(XPS)、紫外-可见-近红外光谱等对样品进行了表征.以罗丹明B(Rh B)为模拟污染物,在可见光照射下研究了Ag掺杂量对催化剂光催化性能的影响.研究结果表明,适量Ag的掺杂能在Ag-TiO_2界面处形成肖特基势垒,起到捕获电子的作用,使得在TiO_2中形成的电子空穴对有效的分离,从而提高催化剂的光催化能力.SiO_2的引入有利于TiO_2纳米颗粒更好的分散,有效的抑制了颗粒之间的团聚,从而增强了光催化剂的吸附能力.而且当SiO_2与TiO_2的质量比为1∶10一定时,Ag掺杂量为1.0%时,催化性能达到最佳,此时以Rh B为模拟污染物进行降解,经过105min可见光照射,降解率达到99.5%. 展开更多
关键词 Ag掺杂TiO2 SiO2 溶胶-凝胶法 光催化降解
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纳米TiO_2/SiO_2复合食品抗菌材料 认领 引用 被引量:23
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作者 杨毅 邓国栋 +2 位作者 尹强 李凤生 付廷明 《精细化工》 EI CAS 北大核心 2001年第12期703-706,共4页
以水玻璃和Ti(SO4) 2 为原料 ,制备出了多孔的纳米TiO2 /SiO2 复合粒子 ,在后处理过程中 ,利用无机包覆剂溶解度随温度的变化 ,在复合粒子表面包覆了一层无机结晶膜 ,经热处理除去包覆剂后 ,得到了以单分散纳米复合粒子组成的复合微粉... 以水玻璃和Ti(SO4) 2 为原料 ,制备出了多孔的纳米TiO2 /SiO2 复合粒子 ,在后处理过程中 ,利用无机包覆剂溶解度随温度的变化 ,在复合粒子表面包覆了一层无机结晶膜 ,经热处理除去包覆剂后 ,得到了以单分散纳米复合粒子组成的复合微粉。对复合微粉进行比表面和孔容测试 ,并运用XRD和TEM进行了表征 ,发现TiO2 以 12 .6nm的纳米晶粒的形式被多孔的SiO2 包覆 ,所形成的复合粒子则约为 2 0nm。为了了解复合微粒的灭菌效果 ,运用纳米TiO2 和复合粉末对 4种保健食品进行对照灭菌实验 ,两个月以后 ,测得含复合微粒的样品中的菌落总数为 5 0~12 0个 /g ,是相应保健食品企业标准许可菌落数的 0 .2 5 %~ 0 .7% ,为相应空白样和纳米TiO2 粉样品菌落数的 0 .5 2 %~ 0 .97%和 3 3 .3 %~ 83 .3 %。 展开更多
关键词 纳米材料 二氧化钛 二氧化硅 抗菌材料 食品
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Photodegradation of soluble microbial products(SMPs) from membrane bioreactor by GO-COOH/TiO2/Ag 认领 引用 被引量:2
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作者 Shuyan Yu Xia Huang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第2期292-300,共9页
This study aimed to explore a new degradation method-photocatalysis technology to polish membrane bioreactor(MBR) effluent, using 2,6-di-tert-butylphenol(2,6-DTBP) as a model soluble microbial product(SMP).2,6-DTBP is... This study aimed to explore a new degradation method-photocatalysis technology to polish membrane bioreactor(MBR) effluent, using 2,6-di-tert-butylphenol(2,6-DTBP) as a model soluble microbial product(SMP).2,6-DTBP is one of the predominant SMPs in MBR effluent, which is refractory and difficult to biodegrade.This study developed a novel carboxylated graphene oxideitanium dioxide/silver(GO-COOH/TiO2/Ag) nanocomposite to photodegrade 2,6-DTBP.GO-COOH/TiO2/Ag was successfully synthesized, using L-cysteine as the linker bonding TiO2/Ag to GO-COOH.The structural, morphological and optical properties of the GO-COOH/TiO2/Ag nanocomposite were characterized using various techniques.Owing to synergistic effects, the GO-COOH/TiO2/Ag nanocomposite exhibited enhanced photocatalytic degradation performance under solar light irradiation when compared to TiO2, Ag and GO-COOH.To remove 25 mg/L 2,6-DTBP, the reaction time for GOCOOH/TiO2/Ag was only 30 min, faster than the 90 min required for pure TiO2 or Ag.In addition, the 200 mg/L GO-COOH/TiO2/Ag nanocomposite aqueous solution showed the best performance under solar light, with 99% removal of 2,6-DTBP.This enhanced capability is likely due to the surface plasmon resonance(SPR) effect contributed by Ag nanoparticles(NPs) doped onto the TiO2.In addition, GO-COOH had a high effective surface area, which assisted in degrading the 2,6-DTBP through improved adsorption.The stability study showed that the photocatalytic activity of the GO-COOH/TiO2/Ag was stable enough for recycling multiple times.The effective degradation performance and excellent stability demonstrates that the GO-COOH/TiO2/Ag nanocomposite can be a promising photocatalyst in the field of effluent SMP photodegradation, which solves the problem of the difficult biodegradation of highly toxic 2,6-DTBP. 展开更多
关键词 Soluble microbial products (SMPs) 2,6-Di-tert-butylphenol (2,6-DTBP) Carboxylated graphene oxideitanium dioxide/silver (GO-COOH/TiO2/Ag) nanocomposite Photocatalysis technology
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Sol-Gel Preparation of Nanoscale TiO2/SiO2Composite for Eliminating of Con Red Azo Dye 认领 引用
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作者 Abdolreza Nilchi Simin Janitabar-Darzi Somayeh Rasouli-Garmarodi 《Materials Sciences and Applications》 2011年第5期476-480,共5页
A new anatase/SiO2 nanocomposite was synthesized by sol-gel method at room temperature using titanium tetrachloride and tetraethylorthosilicate as raw materials. Characterization of the product was carried out by mean... A new anatase/SiO2 nanocomposite was synthesized by sol-gel method at room temperature using titanium tetrachloride and tetraethylorthosilicate as raw materials. Characterization of the product was carried out by means of X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) specific surface areas, Thermogravimetry analysis (TGA), Fourier transform infrared (FT-IR), and UV-vis absorption spectroscopy. Thermal phase transformation studies of composite were carried out up to 1100°C which showed the establishment of anatase TiO2 phase. The presence of some tetrahedral coordination of TiO2 species in SiO2 matrix was confirmed by UV-Vis study. The produced TiO2/SiO2 nanocomposite has good photocatalytic properties due to its anatase phase, existence of tetrahedral coordination of TiO2 in the SiO2 matrix and very large surface area. Furthermore, the synthesized anatase/SiO2 shows significant adsorption ability towards Congo Red (CR) azo dye in comparison with the pure commercial TiO2 which is known as Degussa, P25. 展开更多
关键词 TiO2/SiO2 Nanocomposites Sol-Gel Preparation Photocatalyst Congo Red
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Synthesis of silica/metatitanic acid nanocomposite and evaluation of its catalytic performance for aquathermolysis reaction of extra-heavy crude oil 认领 引用 被引量:2
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作者 Xueliang Liu Yiguang Li +3 位作者 Zhijun Zhang Xiaohong Li Mengyun Zhao Changming Su 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第4期472-476,共5页
A lipophilic silica/metatitantic acid(denoted as Si O2/H2 TiO 3) nanocomposite was synthesized by hydrothermal reaction with surface-modified Si O2 as the lipophilic carrier. As-synthesized Si O2/H2 TiO 3nanocomposi... A lipophilic silica/metatitantic acid(denoted as Si O2/H2 TiO 3) nanocomposite was synthesized by hydrothermal reaction with surface-modified Si O2 as the lipophilic carrier. As-synthesized Si O2/H2 TiO 3nanocomposite was used as a catalyst to promote the aquathermolysis reaction of extra-heavy crude oil thereby facilitating the recovering from the deep reservoirs at lowered temperature. The catalytic performance of the as-synthesized Si O2/H2 TiO 3catalyst for the aquathermolysis reaction of the heavy oil at a moderate temperature of 150 °C was evaluated in relation to the structural characterizations by TEM,FTIR,XRD and FESEM as well as the determination of the specific surface area by N2adsorption–desorption method. Findings indicate that as-synthesized Si O2/H2 TiO 3nanocomposite exhibits an average size of about 20 nm as well as good lipophilicity and dispersibility in various organic solvents; and it shows good catalytic performance for the aquathermolysis reaction of the extra-heavy oil extracted from Shengli Oilfield of China. Namely,the assynthesized Si O2/H2 TiO 3catalyst is capable of significantly reducing the viscosity of the tested heavy oil from58,000 c P to 16,000 c P(referring to a viscosity reduction rate of 72.41%) at a mass fraction of 0.5%,a reaction temperature of 150 °C and a reaction time of 36 h,showing potential application in downhole upgrading heavy crude oils. 展开更多
关键词 SiO2/H2TiO3 nanocomposite Catalytic aquathermolysis Heavy oil Viscosity reduction
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聚N-异丙基丙烯酰胺/SiO_2纳米复合水凝胶的制备及性能 认领 引用 被引量:2
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作者 周莉莉 刘艳霞 +1 位作者 刘乐 冯献起 《河北大学学报(自然科学版)》 CAS 北大核心 2018年第5期496-502,共7页
用一种简便、通用的方法,以N-异丙基丙烯酰胺为单体,以修饰二氧化硅为交联剂和增强剂,制备出一种具有较高机械强度和良好温度响应性能的聚N-异丙基丙烯酰胺/SiO_2PNIPAm/m-SiO_2纳米复合水凝胶.采用TEM、SEM、傅里叶变换红外光谱、万能... 用一种简便、通用的方法,以N-异丙基丙烯酰胺为单体,以修饰二氧化硅为交联剂和增强剂,制备出一种具有较高机械强度和良好温度响应性能的聚N-异丙基丙烯酰胺/SiO_2PNIPAm/m-SiO_2纳米复合水凝胶.采用TEM、SEM、傅里叶变换红外光谱、万能实验机和差示扫描量热法,对水凝胶的结构、机械性能和热力学性能,进行了分析、测试和表征.研究结果表明:该复合水凝胶具有孔径均匀分布的三维网状结构(孔径约1μm)、高的机械强度(压缩强度可以达到8MPa)和良好的韧性,并在35℃左右具有明显的相转变行为(去溶胀性能). 展开更多
关键词 水凝胶 纳米复合材料 二氧化硅 高强度 智能材料
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Preparation,characterization,and tribological properties of silicananoparticle-reinforced B–N-co-doped reduced graphene oxide as a multifunctional additive for enhanced lubrication 认领 引用 被引量:7
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作者 Sang XIONG Baosen ZHANG +2 位作者 Shuai LUO Hao WU Zhen ZHANG 《Friction》 SCIE EI CAS CSCD 2021年第2期239-249,共11页
Microwave-synthesized SiO2-reinforced B–N-co-doped reduced graphene oxide(SiO2–B–N–GO)nanocomposites were characterized by X-ray photon spectroscopy(XPS),X-ray diffraction(XRD),infrared(IR)spectroscopy,and t... Microwave-synthesized SiO2-reinforced B–N-co-doped reduced graphene oxide(SiO2–B–N–GO)nanocomposites were characterized by X-ray photon spectroscopy(XPS),X-ray diffraction(XRD),infrared(IR)spectroscopy,and transmission electron microscopy/energy dispersive X-ray(TEM/EDX)analysis.The tribological properties of the SiO2–B–N–GO prepared as anti-wear additives for enhanced lubrication were studied using a four-ball tester.The experiment results indicated that SiO2–B–N–GO exhibits excellent load-carrying,anti-wear,and anti-friction properties in a base oil,especially at the optimal concentration of additives at 0.15 wt%.The wear scar diameter decreased from 0.70 to 0.37 mm and the coefficient of friction was reduced from 0.092 to 0.070,which reductions are attributed to the formation of B–N and graphene layer tribofilms of several tens of nanometers in thickness that prevented direct contact between metals. 展开更多
关键词 SiO2-B-N-GO nanocomposites material characterization tribological properties
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