Using semiconductor photocatalysts for antibiotic contaminants degradation under visible light has become a hot topic in recent years. Herein, a novel and ingenious cadmium doped graphite phase carbon nitride (Cd-g-C3N4) photocatalyst was successfully constructed via 60°C oil bath method to degrade tetracycline. Experimental and characterization results revealed that cadmium was well doped at g-C3N4 surface and exhibited high intercontact with g-C3N4. Additionally, the introduction of cadmium significantly improved the photocatalytic activity, and the optimum degradation efficiency of 10-Cd-g-C3N4 reached to 98.1%, which was exceeded 2.0 times than pure g-C3N4 (43.9%). Meanwhile, the 10-Cd-g-C3N4 sample presented higher electrical conductivity, light absorption property and photogenerated electron-hole pairs migration compared with bare g-C3N4. Additionally, the quenching experiments and electron spin-resonance tests were exhibited holes (h+), hydroxyl radicals (•OH) and superoxide radicals (•O2−) were main active species involved in TC degradation. Equally, the effects of various conditions on photocatalytic efficiency, such as pH, initial TC concentrations and catalyst dosage, were also researched. This work gives a reasonable point to synthesize high-efficiency and economic photocatalysts.
Using semiconductor photocatalysts for antibiotic contaminants degradation under visible light has become a hot topic in recent years. Herein, a novel cadmium doped graphite phase carbon nitride (Cd/g-C3N4) photocatalyst was successfully constructed via 60 °C oil bath method to degrade tetracycline. Experimental and characterization results revealed that cadmium was well doped at g-C3N4 surface and exhibited high intercontact with g-C3N4. Meanwhile, Cd/g-C3N4 presented excellent electrical conductivity and inhibited the recombination of electron-hole pairs. The introduction of cadmium significantly improved the photocatalytic activity and the degradation efficiency of 10 Cd/g-C3N4 reached to 89.09%, which was exceeded 2.0 times than pure g-C3N4 (43.99%). Additionally, the quenching experiments and electron spin-resonance tests exhibited holes (h+), hydroxyl radicals (•OH) and superoxide radicals (•O2−) were dominated active species in TC degradation. Furthermore, the effects of various conditions on the reaction process, such as different pH, initial TC concentrations and catalyst dosage, were also researched. This work gives a reasonable point to synthesize high-efficiency and economic photocatalysts.
Purpose: Gastric cancer ranks sixth and second in incidence and mortality among all cancer. The purpose of our research was to evaluate the prognostic value of uric acid to lymphocyte ratio (ULR) for advanced gastric cancer (AGC) patients after gastrectomy with D2 lymphadenectomy.Methods: In this research, we included 287 AGC patients underwent gastrectomy with D2 lymphadenectomy. These patients were followed up for 5 years, and their clinicopathological data were collected. All patients were divided into two groups based on the preoperative ULR level. Then we established the propensity score matching (PSM) cohort to confirm our results. Finally, The clinical characteristics and survival indexes of the two groups in the PSM cohort and the entire cohort were compared. Results:We found that age and gender were significantly correlated with the ULR level. Multivariate analysis for the entire cohort and PSM cohort showed that high levels of ULR, poor differentiation, postoperative pathology of T4 stage, and regional lymph node metastasis were independent prediction factors for poor outcomes of overall survival (OS) and Disease-free survival (DFS) in patients with AGC after gastrectomy with D2 lymphadenectomy. Survival analysis showed that the OS and DFS in the high level ULR group were significantly shorter than in the low level ULR group (log-rank P < 0.001). Conclusion: High level ULR is a poor predictive factor for patients with AGC underwent gastrectomy with D2 lymphadenectomy, and high levels of ULR predict shorter OS and DFS.
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