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1.
J Hazard Mater ; : 121761, 2019 Nov 25.
Artigo em Inglês | MEDLINE | ID: mdl-31796359

RESUMO

MXenes, as new members of the 2D materials group, are regarded as good candidates for heavy metal removal particularly for radioactive metal element because of their high irradiation stability. However, the small interlayer distance and lack of active sites on the surface limit their further application. In this report, nanoscale zero-valent iron has been introduced into the inter-layer structure of alkaline intercalated Ti3C2 (Alk-Ti3C2) and investigated to Cr(VI) removal. The XPS spectra, SEM images, TEM images, and N2 adsorption-desorption isotherms characterizations revealed that the OH groups on the Alk-Ti3C2 surface assisted the introducing of nZVI into the inter-layer of Alk-Ti3C2 and subsequently stabilized the nZVI. The increased active sites of nZVI and extended interlayer space of Alk-Ti3C2 could improve the uptake capacity of Cr(VI) (194.87 mg/g at pH = 2). The highly efficient removal of Cr(VI) was maintained even in the presence of coexisting cations, which showed great potential for real environment remediation. Mechanistic study indicated that the synergistic effects of nZVI and Alk-Ti3C2 nanosheet in nZVI-Alk-Ti3C2 composites are keys for Cr(VI) removal.

2.
Medicine (Baltimore) ; 98(37): e17099, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31517838

RESUMO

BACKGROUND: This is the first systematic review evaluating and statistically synthesis the current studies regarding the effects of Tai Chi on pain and disability in patients with low back pain (LBP). METHODS: Seven electronic databases including PubMed, EMBASE, Web of Science, Cochrane Library, China National Knowledge Infrastructure (CNKI), Wanfang and VIP information from inception to early March 2019 were searched. The Physiotherapy Evidence Database (PEDro) Scale was used to assess quality of all included randomized controlled trials (RCTs). The pooled effect size (weight mean difference, WMD) and 95% confidence interval (CI) were calculated to determine the effect of Tai Chi on pain and disability among LBP patients based on random effects model. RESULTS: The aggregated results of the meta-analysis suggested that Tai Chi significantly decreased pain (WMD = -1.27, 95%CI -1.50 to -1.04, P < .00001, I = 74%) and improve function disability, Oswestry disability index (ODI) subitems: pain intensity (WMD = -1.70, 95% CI -2.63 to -0.76, P = .0004, I = 89%); personal care (WMD = -1.93, 95% CI -2.86 to -1.00, P < .0001, I = 90%); lifting (WMD = -1.69, 95% CI -2.22 to -1.15, P < .0001, I = 66%); walking (WMD = -2.05, 95% CI -3.05 to -1.06, P < .0001, I = 88%); standing (WMD = -1.70, 95% CI -2.51 to -0.89, P < .0001, I = 84%); sleeping (WMD = -2.98, 95% CI -3.73 to -2.22, P < .00001, I = 80%); social life (WMD = -2.06, 95% CI -2.77 to -1.35, P < 0.00001, I = 80%) and traveling (WMD = -2.20, 95% CI -3.21 to -1.19, P < .0001, I = 90%), Japanese Orthopedic Association (JOA) score (WMD = 7.22, 95% CI 5.59-8.86, P < .00001, I = 0%), Medical Outcomes Study Questionnaire Short Form 36 Health Survey (SF-36) physical functioning (WMD = 3.30, 95% CI 1.92-4.68, P < .00001), and Roland-Morris Disability Questionnaire (RMDQ) (WMD = -2.19, 95% CI -2.56 to -1.82, P < .00001). CONCLUSION: We drew a cautious conclusion that Tai Chi alone or as additional therapy with routine physical therapy may decrease pain and improve function disability for patients with LBP. Further trials are needed to be conducted with our suggestions mentioned in the systematic review.


Assuntos
Dor Lombar/terapia , Manejo da Dor/normas , Tai Ji/normas , Humanos , Manejo da Dor/métodos , Modalidades de Fisioterapia/normas , Ensaios Clínicos Controlados Aleatórios como Assunto/estatística & dados numéricos , Tai Ji/métodos
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