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| 1 | Competitive role of nitrogen functionalities of N doped GO and sensitizing effect of Bi_(2)O_(3)QDs on TiO_(2)for water remediation显示文摘The promising solar irradiated photocatalyst by pairing of bismuth oxide quantum dots(BQDs)doped TiO_(2)with nitrogen doped graphene oxide(NGO)nanocomposite(NGO/BQDs-TiO_(2))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 diffraction(XRD)profile of NGO showed reduction in oxygenic functional groups and restoring of graphitic crystal structure.The characteristic diffraction peaks of TiO_(2)and its composites showed crystalline anatase TiO_(2).Morphological images represent spherical shaped TiO_(2)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 TiO_(2)results into red shifting in visible region as studied in diffused reflectance spectroscopy(DRS).NGO and BQDs in TiO_(2)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-TiO_(2)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 activity 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 O_(2)^(·-) has significant role for degradation of 2,4-DCP.Our investigations propose that fabricated nanohybrid architecture has potential for degradation of environmental pollutions. | Saima Noor Shamaila Sajjad Sajjad Ahmed Khan Leghari Cristina Flox Saeed Ahmad | 2021 | Journal of Environmental Sciences2021，33，10： | 2 |
| 2 | 并流控速沉淀法制备纳米α-Bi_(2)O_(3)及其光催化降解苯酚性能研究显示文摘以五水合硝酸铋为铋源,氢氧化钠为沉淀剂,通过简单易操作的并流控速沉淀法合成了α-Bi_(2)O_(3)纳米颗粒。同时,利用XRD和SEM分析了所获产品的结构与表面形貌。并选用苯酚作为模拟污染物,利用LC3000型高效液相色谱仪对其进行色谱分析,探究了所合成的纳米α-Bi_(2)O_(3)光催化剂的催化性能。当苯酚的质量分数为100μg·g^(-1)、p H=8、α-Bi_(2)O_(3)投加量为60 mg·L^(-1)时,可见光照射180 min,降解率可达92.6%。通过自由基捕获实验发现,在α-Bi_(2)O_(3)光催化降解苯酚体系中主要活性物种为羟基自由基。 | 蒋娟 孟庆明 | 2021 | 当代化工2021，50，8： | 0 |
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