【摘 要】
:
The promising solar irradiated photocatalyst by pairing of bismuth oxide quantum dots(BQDs)doped TiO2 with nitrogen doped graphene oxide(NGO)nanocomposite(NGO/BQDs-TiC2)was fabricated.It was used for degradation of organic pollutants like 2,4-dichlorophen
【机 构】
:
International Islamic University,Islamabad 44000,Pakistan;Department of Chemistry and Materials Scie
论文部分内容阅读
The promising solar irradiated photocatalyst by pairing of bismuth oxide quantum dots(BQDs)doped TiO2 with nitrogen doped graphene oxide(NGO)nanocomposite(NGO/BQDs-TiC2)was fabricated.It was used for degradation of organic pollutants like 2,4-dichlorophenol(2,4-DCP)and stable dyes,i.e.Rhodamine B and Congo Red.X-ray diffrac-tion(XRD)profile of NGO showed reduction in oxygenic functional groups and restoring of graphitic crystal structure.The characteristic diffraction peaks of TiO2 and its compos-ites showed crystalline anatase TiO2.Morphological images represent spherical shaped TiO2 evenly covered with BQDs spread on NGO sheet.The surface linkages of NO-O-Ti,C-O-Ti,Bi-O-Ti and vibrational modes are observed by Fourier transform infrared spectroscopy(FTIR)and Raman studies.BQDs and NGO modified TiO2 results into red shifting in visible re-gion as studied in diffused reflectance spectroscopy(DRS).NGO and BQDs in TiO2 are linked with defect centers which reduced the recombination of free charge carriers by quenching of photoluminescence(PL)intensities.X-ray photoelectron spectroscopy(XPS)shows that no peak related to C-O in NGO/BQDs-TiO2 is observed.This indicated that doping of nitrogen into GO has reduced some oxygen functional groups.Nitrogen functionalities in NGO and photosensitizing effect of BQDs in ternary composite have improved photocatalytic activ-ity against organic pollutants.Intermediate byproducts during photo degradation process of 2,4-DCP were studied through high performance liquid chromatography(HPLC).Study of radical scavengers indicated that O2-has significant role for degradation of 2,4-DCP.Our in-vestigations propose that fabricated nanohybrid architecture has potential for degradation of environmental pollutions.
其他文献
目的 观察活动与固定平台的单髁假体置换(unicompartmental knee arthroplasty,UKA)在膝关节单间室骨关节炎中的临床应用效果.方法 选择2018年1月至2019年1月收治的84例膝关节前内侧骨关节炎患者,随机分为对照组与观察组各42例.对照组采用Link固定平台UKA治疗,男20例,女22例;年龄52~88岁,平均(68.16±5.28)岁;左膝13例,右膝29例;身体质量指数(23.51±3.82)kg/m2;术前关节平均屈曲角度(115.62±5.49)°.观察组采用O
Biochar as an emerging carbonaceous material has exhibited a great potential in environ-mental application for its perfect adsorption ability.However,there are abundant persistent free radicals(PFRs)in biochar,so the direct and indirect PFRs-mediated remo
骨关节炎(osteoarthritis,OA)是老年人的常见疾病之一,以膝关节最多见.国内有学者研究发现65岁以上人群患病率为8.1%,其中超过30%为单间室退变[1].膝关节单间室OA内侧多见,外侧相对少见,发生率不足10%[2].关节置换是目前治疗终末期OA的有效方法,常见的有膝关节单髁置换术(unicompartmental knee arthroplasty,UKA)和全膝关节置换术(total knee arthroplasty,TKA).目前内侧UKA已显示出较好的疗效[3],国内外相关研究和
目的 回顾性分析Oxford Ⅲ混合型单髁关节置换术(unicompartmental knee arthroplasty,UKA)短期临床疗效.方法 回顾性研究2018年5月至2020年5月就诊于河北省沧州中西医结合医院33例内侧膝关节骨关节炎行Oxford混合型UKA患者资料,其中男17例,女16例;左膝15侧,右膝18侧;年龄49~66岁,平均(56.06±5.41)岁;身体质量指数19.59~34.60 kg/m2,平均(26.22±3.63)kg/m2.记录疼痛视觉模拟评分(visual ana
近年来发展的开放楔形胫骨高位截骨术(open wedge high tibial osteotomy,OWHTO)被证明是治疗骨关节炎的有效手段,特别适合于相对年轻活跃的伴有胫骨内翻的前内侧骨关节炎患者[1-3].OWHTO经过胫骨近端内侧完成手术,与闭合截骨比较具有较大优势.OWHTO不用剥离肌肉,不用截断腓骨,避免了腓骨截骨相关的并发症,血管神经损伤、骨筋膜室综合征发生率低.开放截骨术可以更精确地调整下肢力线,分散下肢应力,使膝关节内侧间室得到充分减压的同时,也不过度增加外侧间室的压力.术者可取得位置
广式家具是中国传统家具的发展和延续,清中后期受到对外贸易的影响,与西方文化发生了交流反应,产生众多造型独特的“混血”家具,丰富了传统家具的成果宝库.从对外贸易视角下探讨广式叠几的造型特征,以期探索清末广式外销家具创新设计之谜,给今日家具创新发展以启示.通过探究广式叠几的演变过程,从造型体态上找到其创新演变的原因;并从几的使用用途、几面形状以及重叠完成度进行分类研究,最后从尺寸、整体比例以及虚实比例对广式叠几的造型特征进行分析.研究数据结果显示,广式叠几在高度上的变化是最大的,比例在传统基础上进行一定的夸张
目的 探讨MRI测量外侧胫骨平台后倾角(lateral tibial plateau slope,LPS)、股骨髁间窝宽度指数(notch width index,NWI)与前交叉韧带(anterior cruciate ligament,ACL)损伤部位的相关性.方法 回顾性分析我科自2018年9月至2020年9月收治的ACL完整患者40例及ACL损伤患者80例,共120例.其中男45例,女75例;年龄16~52岁,平均(30.08±9.95)岁.在患者行膝关节镜手术时明确并记录ACL损伤的部位,根据是
为了挖掘和弘扬中国传统榫卯结构中展现的设计美学和人文思想,探索榫卯结构在现代家具中的应用设计思路.本文对中国传统家具中榫卯结构的自然性、科学性、装饰性以及哲学性进行了分析,从中探求古人的造物观、审美观、人生观和世界观,按榫卯结构在传统家具中的构造作用将其分为面与面、线与面、线与线、线与点的接合.据此提出榫卯结构在现代家具中的创新可以从三个方向入手:榫卯结构功能化、榫卯结构可视化、榫卯结构模块化,取其“形”、用其“意”,使其科学性、文化性得以传承和发展,最后结合笔者的设计方案以示说明.
目的 本研究设计了一款基于“H”点的全新3D打印个性化截骨导板(patient-specific instrument,PSI),并将其应用于尸体研究,探讨其应用于胫骨高位截骨术(high tibial osteotomy,HTO)的可行性和精确性.方法 纳人新鲜冰冻尸体12具,其中男性5具,女性7具;年龄53~72岁,平均(60.92±5.92)岁.12具尸体标本中共收集24个完整下肢.将完整下肢随机分为两组:(1)PSI组(14个),采用3D术前设计和PSI导板辅助截骨;应用软件重建3D模型,在此基础
Landfill sites are regarded as prominent sources of bioaerosols for the surrounding atmo-sphere.The present study focused on the emission of airborne bacteria and fungi in four seasons of a sanitary landfill site.The main species found in bioaerosols were