Papers by Keyword: Biodegradability

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Authors: Sha Luo, Qing Qing Zhang, Yan Chang Zhang, Chao Li, Xiao Qing Xu, Tie Tao Zhou
Abstract: Magnesium alloys have a good application prospect in the fields of bone implants and cardiovascular stents due to their excellent properties, such as close density and elastic modulus to those of nature bone, high specific strength and rigidity, biodegradation and biocompatibility. In this paper, the feasibility of the use of the forged Mg-Li-X alloys (Mg-Li-Al-Zn-Ca-Sr) as biodegradable metals was investigated by immersion tests in the Hanks solution and skin-tissue implantation tests. The methods of SEM-EDS and XRD were used to research the corrosion morphology and corrosion products of the forged Mg-Li-X alloys after the in-vitro and in-vivo tests. At last, the in-vitro cytotoxicity was investigated by the MTT tests on L929 cells. Results showed that corrosion mechanism of the forged Mg-Li alloys was pitting and the surfaces were covered by Mg (OH)2,CaCO3 and Ca (H2PO4)2 . During the 5 weeks implantation period, the rats survived from the operation, which indicates that the elements and the compounds formed are non-toxic to the rats. The forged Mg-Li alloy showed Grade 0~1 cytotoxicity, which manifests the forged Mg-Li alloy has good biocompatibility and eligible toxicity for implant applications.
Authors: Mujtahid Kaavessina, Fitriani Khanifatun, Imtiaz Ali, Saeed M. Alzahrani
Abstract: Poly (lactic acid) was solvent-blended and formed as thin ribbons with different weight fraction of hydroxyapatite, namely 5, 10 and 20wt%. In-vitro biodegradability of biocomposites was performed in phosphate buffer solution (PBS) at 37°C. The presence of hydroxyapatite tended to increase biodegradability of poly (lactic acid) in its biocomposites. Thermal stability of biocomposites was always higher than that neat poly (lactic acid) either before and after hydrolytic degradation tests. After biodegradation tests, some micro-holes and cracks were appeared in the surface morphology of biocomposites as well as the increasing crystallinity occurred.
Authors: Renate Gildenhaar, Georg Berger, E. Lehmann, Michael Stiller, Ch. Koch, Paul Ducheyne, A. Rack, H. Seligmann, S. Jonscher, Christine Knabe
Authors: Zhan Li Chen, Xiao Hua Huang, Zhen Zhong Liu, Xian Rong Sun
Abstract: This chemical synthesis-based pharmaceutical wastewater is treated by the process of hybrid hydrolysis acidification technique (HHAT) with anaerobic-low DO condition and the hybrid aerobic bio-technology consisted of alternate-flow biological reactor (ABR) and two-way-flow biological aerated filter (TBAF). The micro aerobic technology was employed in the HHAT and showed its advantages in refractory organic wastewater treatment. The largest plant in pharmaceutical wastewater treatment at home was built. The practice shows that the organics can be greatly removed and the effluent can reach the First Grade Discharge Standard which can be reclaimed with advanced treatment. The performance indicates that the combined bio-technologies are stable in pharmaceutical wastewater treatment.
Authors: Zhan Li Chen, Zhen Zhong Liu, Xiang Rong Sun, Xiao Hua Huang, Jian Zhan
Abstract: The performance of micro-aerobic hydrolysis and acidification on the treatment of refractory Chinese traditional medicine wastewater was studied. The results indicate that it is efficient pre-treatment for reducing toxicity, improving biodegradability and removing organic pollutants from dyestuff wastewater. The effluent quality was relatively stable with the fluctuant influent while the removal efficiencies of COD and SS were 28% and 81% respectively, and more importantly, the increment of BOD5/COD ratio was about 0.18.
Authors: Han Yong Jeon
Abstract: In this study, concept of green geosynthetics was introduced in terms of biodegradability. Development of green geosynthetics, its background and technical concerns were discussed through some research results of PLA(polylactic acid) specimens. Test method for biodegradability of PLA(polylactic acid) as a green geosynthetics were considered and suggested based on composting method. Finally, the rest result shows that the concept of biodegradability for green geosynthetics is available in the environmental application. PLA 4032D/PBAT(80/20) blend shows improvement of environmental performance as a green geosynthetics application than PLA 4032D only used.
Authors: Gabriel Furtos, Laura Silaghi-Dumitrescu, Katarzyna Lewandowska, Alina Sionkowska, Petru Pascuta
Abstract: The development of polymer and inorganic filler lead to new biocomposite materials with a wide range of applications in orthopedic and dental application. Biomposites possess an excellent biocompatibility, biodegradability and superior mechanical properties. The inclusion of bioactive filler of hydroxyapatite, wollastonite glass-ceramics and bioactive glass could provide bioactivity of biocomposites. This review summarizes the recent work on the development of biocomposites containing biopolymers with different bioactive particles suitable for use in bone defects/bone regeneration and dental application.
Authors: Yan Jiang, Nai Yan Wang, Jian Wei Huang, Tao Hu, Ming Xin Zhang, Yao Feng Zhang, Yao Gang Li
Abstract: Papermaking wastewater is one of six industry polluted sources. It generally contains various pollutants which can cause many problems during biological treatment. The biodegradability of papermaking wastewater was enhanced by electron beam irradiation with an activated sludge process. The value of the BOD5/COD ratio increased at a 20kGy dose. The non-biodegradable organic compounds were converted into biodegradable compounds. High organic removal efficiencies and high microbial activities were achieved in activated sludge process. The application of an integrated system can be a powerful process which contains electron beam irradiation and a biological treatment to papermaking wastewater.
Authors: Xue Chuan Wang, Yu Qiao Fu, Long Fang Ren, Tao Tao Qiang
Abstract: The methods of respiratory curve and COD30 were adopted to evaluate the biodegradability of acrylic retanning agent DT-R548 with medium and large relative molecular weight, which was used as the substrate of microorganism. The main results obtained by the method of respiratory curves were as follows. When the concentration of substrate was 0~3000mg/L, the respiratory curves of the substrate were under the curve of endogenous, which showed that the substrate has inhabiting effect on microorganism. When the concentration of the substrate was 1500mg/L, the utilization of the substrate by microorganism was the most. The main results obtained by the method of COD30 were as follows. When sludge concentration was 1000mg/L and pH was 7, the biodegradation rate of 1500mg/L DT-R548 was 19.74%. Under above condition, the biodegradation rates of DT-R548 with other concentrations were much smaller. Moreover, as indicated in the respiratory curves, the effect of sludge concentration, pH, salinity and co-metabolism on the biodegradability of the substrate was obvious. Under the experimental conditions, when the concentration of the substrate was 1500mg/L, the sludge concentration was 3000mg/L, pH was 7.5 and salinity was 0.5%, the biodegradability of the substrate was the best. The glucose was as co-metabolism substrate and when its concentration was 600mg/L, the biodegradability of the substrate was obviously increased.
Authors: Bing Xin Sun, Cheng Zhi Chuai, Si Luo, Ying Guo, Xu Qiao Feng
Abstract: To investigate the biodegradability of PBS, films made of PBS were subjected to enzymatic degradation. The declining thermal stability and XRD diagrams showed that the crystallinity of PBS was reduced after degradation. SEM results confirmed that the mode of enzymatic degradation was surface corrosion. In addition, the weight loss of the material did not experience the so-called acclimation period, but showed a typical linear growth process.
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