The detection on tetracycline( TC) in drinking water poses an environmental issue since TC has been widely used to prevent animal disease and promote their growth. In addition,TC was difficult to remove or biodegrade,...The detection on tetracycline( TC) in drinking water poses an environmental issue since TC has been widely used to prevent animal disease and promote their growth. In addition,TC was difficult to remove or biodegrade,which posed a challenge to the conventional techniques. In this work,the batch experiments on TC adsorption in aqueous solution of hydrogel( HG) consisting of graphene oxide( GO) and TiO_2 nanotubes( TN) were successfully conducted. HG composite( HG-TN-GO) was prepared with TN and GO with self-assembly method during the oxidation-reduction reaction,and criogel( CG) with TN and GO was characterized by pH at point of zero charge( pH_(pzc)), transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy( XPS). The adsorption capacity of HG-TN-GO on TC was evaluated by analyzing its isotherms. The maximum adsorption capacity reached 751. 3 mg/g. Besides,the adsorption isotherms were well fitted by the Langmuir model, with the theoretical maximum( q_m) of 797. 0 mg/g. The adsorption process was systematically studied by varying pH during the whole adsorption process. The adsorption occurred probably via π-π interaction and cation-π bonding between TC and the HG-TN-GO surface. The composite could be regenerated in 50% ethanol aqueous solution,without significant capacity loss. After 6 recycles,the decrease of adsorption capacity was less than 10%.展开更多
A novel composites hydrogel adsorbent was facilely synthesized for efficient removal of acid dyes from aqueous solution.The composite hydrogel consisting of TiO_2 nanotubes(TN) and graphene oxide(GO)(H-TN-GO) was char...A novel composites hydrogel adsorbent was facilely synthesized for efficient removal of acid dyes from aqueous solution.The composite hydrogel consisting of TiO_2 nanotubes(TN) and graphene oxide(GO)(H-TN-GO) was characterized by BrunauerEmmett-Teller(BET),transmission electron microscope(TEM),scanning electron microscope(SEM),Raman spectra and X-ray photoelectron spectroscope(XPS).Experimental results elucidated that columnar hydrogel could be tunably prepared with self-assembly by adjusting the proportion of GO/TN,mixing time and pH.The properties of adsorption and regeneration on methyl orange(MO)onto H-TN-GO were investigated respectively.The maximal adsorption capacity of H-TN-GO for MO reached 933.8 and 513.7mg/g under the pH of 4.0 and 6.8,respectively.The adsorption capacity of MO reached the maximum when pH was equivalent to4.0,which attributed to increasing electrostatic attraction.Besides,the adsorption behavior was fitted reasonably better with Freundlich isotherm model than Langmuir model;the adsorption speed was rapid and the removal ratio almost reached 99.5% when the concentration of MO was less than 100 mg/L.After the used adsorbent was irradiated with the ultraviolet ray of 500 W for 3 h,its adsorption capacity could be recovered without significant loss.展开更多
目的了解自体耳屏软骨在鼓膜严重内陷回缩、或再生鼓膜严重菲薄内陷患者鼓室成形术中的疗效。方法将自体耳屏软骨用于11例鼓膜严重内陷回缩、或再生鼓膜严重菲薄内陷的患者,修补鼓膜,其中5例单纯行鼓膜修补,6例同期行乳突改良根治,术中...目的了解自体耳屏软骨在鼓膜严重内陷回缩、或再生鼓膜严重菲薄内陷患者鼓室成形术中的疗效。方法将自体耳屏软骨用于11例鼓膜严重内陷回缩、或再生鼓膜严重菲薄内陷的患者,修补鼓膜,其中5例单纯行鼓膜修补,6例同期行乳突改良根治,术中完整保留内陷的鼓膜,将耳屏软骨置于其内侧。结果11例移植物均成活,术后语言频率气骨导间距≤10 dB 5例;气骨导间距≤20 dB 6例。语言频率气导平均提高16.5 dB;本组患者均未发现听力回降及鼓膜回缩。结论对鼓膜严重内陷回缩、或再生鼓膜严重菲薄内陷患者利用自体耳屏软骨行鼓室成形术,移植物易成活,因术中完整保留内陷鼓膜,利用耳屏软骨对鼓膜的支撑作用,手术疗效明显提高。展开更多
基金Environmental Engineering,Natural Science Foundation of China(No.51522805)Innovation Foundation of Nanjing Institute of Technology,China(No.CKJB201410)
文摘The detection on tetracycline( TC) in drinking water poses an environmental issue since TC has been widely used to prevent animal disease and promote their growth. In addition,TC was difficult to remove or biodegrade,which posed a challenge to the conventional techniques. In this work,the batch experiments on TC adsorption in aqueous solution of hydrogel( HG) consisting of graphene oxide( GO) and TiO_2 nanotubes( TN) were successfully conducted. HG composite( HG-TN-GO) was prepared with TN and GO with self-assembly method during the oxidation-reduction reaction,and criogel( CG) with TN and GO was characterized by pH at point of zero charge( pH_(pzc)), transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy( XPS). The adsorption capacity of HG-TN-GO on TC was evaluated by analyzing its isotherms. The maximum adsorption capacity reached 751. 3 mg/g. Besides,the adsorption isotherms were well fitted by the Langmuir model, with the theoretical maximum( q_m) of 797. 0 mg/g. The adsorption process was systematically studied by varying pH during the whole adsorption process. The adsorption occurred probably via π-π interaction and cation-π bonding between TC and the HG-TN-GO surface. The composite could be regenerated in 50% ethanol aqueous solution,without significant capacity loss. After 6 recycles,the decrease of adsorption capacity was less than 10%.
基金National Natural Science Foundation of China(No.51522805)
文摘A novel composites hydrogel adsorbent was facilely synthesized for efficient removal of acid dyes from aqueous solution.The composite hydrogel consisting of TiO_2 nanotubes(TN) and graphene oxide(GO)(H-TN-GO) was characterized by BrunauerEmmett-Teller(BET),transmission electron microscope(TEM),scanning electron microscope(SEM),Raman spectra and X-ray photoelectron spectroscope(XPS).Experimental results elucidated that columnar hydrogel could be tunably prepared with self-assembly by adjusting the proportion of GO/TN,mixing time and pH.The properties of adsorption and regeneration on methyl orange(MO)onto H-TN-GO were investigated respectively.The maximal adsorption capacity of H-TN-GO for MO reached 933.8 and 513.7mg/g under the pH of 4.0 and 6.8,respectively.The adsorption capacity of MO reached the maximum when pH was equivalent to4.0,which attributed to increasing electrostatic attraction.Besides,the adsorption behavior was fitted reasonably better with Freundlich isotherm model than Langmuir model;the adsorption speed was rapid and the removal ratio almost reached 99.5% when the concentration of MO was less than 100 mg/L.After the used adsorbent was irradiated with the ultraviolet ray of 500 W for 3 h,its adsorption capacity could be recovered without significant loss.
文摘目的了解自体耳屏软骨在鼓膜严重内陷回缩、或再生鼓膜严重菲薄内陷患者鼓室成形术中的疗效。方法将自体耳屏软骨用于11例鼓膜严重内陷回缩、或再生鼓膜严重菲薄内陷的患者,修补鼓膜,其中5例单纯行鼓膜修补,6例同期行乳突改良根治,术中完整保留内陷的鼓膜,将耳屏软骨置于其内侧。结果11例移植物均成活,术后语言频率气骨导间距≤10 dB 5例;气骨导间距≤20 dB 6例。语言频率气导平均提高16.5 dB;本组患者均未发现听力回降及鼓膜回缩。结论对鼓膜严重内陷回缩、或再生鼓膜严重菲薄内陷患者利用自体耳屏软骨行鼓室成形术,移植物易成活,因术中完整保留内陷鼓膜,利用耳屏软骨对鼓膜的支撑作用,手术疗效明显提高。
