Enhancement of photocatalytic activity for fold-like ZnO via hybridisation with graphene

Micro & nano letters

article

Xia Kong¹  Yawei Hu¹  Wei Pan² 

[1]College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology

[2]State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University

关键词: catalysis;    photochemistry;    zinc compounds;    II-VI semiconductors;    wide band gap semiconductors;    graphene;    nanoparticles;    nanofabrication;    adsorption;    C-ZnO;    electron transport characteristics;    electron–hole pair separation;    adsorption ability;    photo-electrochemical experimental results;    visible irradiation;    ultraviolet irradiation;    methylene blue solution;    hydrothermal method;    fold-like nanoparticles;    graphene;    hybridisation;    photocatalytic activity;   

DOI  :  10.1049/mnl.2017.0395

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Background: In rural South Africa, most patients with oesophageal cancer have delayed presentations with debilitating symptoms and inoperable disease. This study was undertaken to quantify the delay between onset of symptoms and definitive treatment in a cohort of patients in rural South Africa, presenting to a state hospital in KwaZulu-Natal. The study also sought to establish reasons for delays in seeking medical attention and identify ways to encourage earlier presentation. Methods: It was a two-armed study of patients with oesophageal cancer seen at Greys Hospital in Pietermaritzburg. One was a retrospective chart review establishing a timeline. The second part was a prospective study between June and November 2012 where data were collected by means of patient interviews. Results: One hundred and thirteen charts were reviewed. The time from first symptoms to definitive management ranged from 2 to 14 months (average 7 months). Forty-six patients were interviewed. All experienced dysphagia but 83% were only prompted to seek help after weight loss. The duration of symptoms prior to first clinic or hospital attendance was 0–12 months (average 3 months). The reasons for the delay included the following: 41% of patients did not consider dysphagia a significant symptom, 24% had no money, 19% sought the help of traditional healers first and 15% said the hospital was too far away. Conclusion: There are long delays in the management of oesophageal cancer in our setting. The delays are prehospital as well as within the health care system. Lack of knowledge about oesophageal cancer symptoms and limited access to health care contributed to delays in management. Targeted quality improvement interventions are necessary. Patient education and improved referral systems are vital in encouraging earlier presentation.

【 授权许可】

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