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本文通过正交试验对色素炭黑在不同条件下,采用特殊的流化床反应器,使用臭氧对炭黑进行了表面改性处理,试验得到了臭氧氧化的最佳湿度为100℃,最佳气量为0.35m^3/h,最佳反应时间为80min(O2),并对影响因素作了阐述。 相似文献
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孙从振王佳颖龚颖祺闵洁 《炭素技术》2016,(3):29-34
为了提高炭黑在水溶液中的分散性,通过液相臭氧氧化法对炭黑表面进行氧化改性,并利用沉降实验表征炭黑在水溶液中的分散稳定性,同时也利用TEM、纳米粒度与电位分析仪表征改性前后炭黑的分散性及平均粒径。此外,还分别利用傅里叶红外光谱仪、热重分析仪、元素分析仪表征臭氧改性炭黑的表面基团结构及含量、元素组成。结果表明:炭黑经过臭氧改性后,引入了大量的羧基、羟基等酸性含氧官能团,并且在水溶液中的分散性明显提高。在3 500 r/s的离心机中离心60 min时,其透光率为26.1%,而此时原样炭黑分散液的透光率却为96.7%。 相似文献
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臭氧微泡技术提高炭黑在水溶液中的分散稳定性 总被引:1,自引:0,他引:1
为了在水性体系下获得高分散性的炭黑,本实验通过臭氧微米气泡技术对炭黑表面进行氧化,并通过沉降实验检测了炭黑在水性体系下的分散稳定性,利用傅立叶红外光谱仪(FT-IR),X光电子能谱仪(XPS),元素分析仪,热分析仪(DTA-TG)、扫描电子显微镜(SEM)分别对臭氧氧化改性后炭黑的表面基团结构,表面含氧量进行了表征.结果表明,经过臭氧氧化改性后的炭黑,大量的羧基、羟基等亲水性含氧基团被引入,即使高速(3500 r/min)离心沉降60 min后,炭黑在水溶液中的稳定性系数仍然可达到93.6%. 相似文献
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炭纤维、炭黑、石墨等多种炭素材料在进行表面改性后能够提高品质,增强分散性.工业上炭素材料表面改性的传统方法多以强酸为氧化剂,易造成较为严重的环境污染.而臭氧氧化法因其氧化效率高、绿色环保、成本低等优点,可取代强酸氧化成为更为理想的炭素材料表面改性方法.本文介绍了臭氧氧化法及其在各种炭素材料表面改性中的应用及研究进展,并对其存在问题和研究前景进行了说明和展望. 相似文献
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研究炭黑及沥青基短切碳纤维表面臭氧改性对碳纤维填充天然橡胶(NR)硫化胶物理性能的影响。结果表明:臭氧改性后,碳纤维的涂覆层基本去除且表面粗糙度明显增加;碳纤维/NR复合材料拉伸断面中碳纤维表面光滑且与NR发生明显脱粘,复合材料物理性能较低;填充30份炭黑N330后,碳纤维/NR复合材料物理性能显著提高,炭黑/短纤维/NR复合材料和炭黑/臭氧改性碳纤维/NR复合材料的拉伸强度分别达到18.6和26.9 MPa,较碳纤维单独填充时分别提高了431%和627%;碳纤维与炭黑具有类似的微观结构,炭黑在碳纤维补强NR时起到桥梁作用,从而大大增强了两者间的界面强度。 相似文献
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中国科学院前不久宣布,该院科研人员开发成功一种流化床反应器,可对低档普通超细炭黑进行臭氧氧化表面改性,生产出市场急需的高档特种炭黑。 相似文献
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针对某石化企业含盐污水的深度处理,开展了微电解氧化和臭氧氧化对比试验研究,比较了2种方法的处理效果。结果表明,对于微电解氧化法,在反应时间为2 h,pH为2~3,填料比为1∶1的条件下,COD去除率为12%~18%,B/C可从原水的0.07升高到0.11,B/C提高幅度小,出水可生化性仍较差,且产生较多沉渣;对于臭氧氧化法,当臭氧投加量为25 g/h,反应时间为2.0 h时,COD去除率达25%,B/C可从原水的0.07升高至0.35,B/C大幅提高,利于后续进一步生化处理。 相似文献
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以臭氧/紫外光协同技术处理中低浓度氨氮废水,采用批实验对该技术处理中低浓度氨氮废水的特性进行研究,考虑了pH、臭氧流量、温度、氨氮初始浓度和反应时间对处理效果的影响。结果表明,废水中氨氮去除率随pH、臭氧流量、温度和反应时间的增大而增加,在pH 12.0、反应温度30℃、臭氧流量14.0 L/h时,反应时间120 min后氧化锰厂废水氨氮去除率达96.2%,处理后废水氨氮质量浓度由220 mg/L降至8.36 mg/L,达到GB 31573-2015直接排放标准。与臭氧、紫外光处理氨氮的对比实验表明,臭氧/紫外光协同技术表现出较高的氨氮去除效果。 相似文献
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Coplanar discharge is a new type of barrier discharge, and has some advantages for high-concentration ozone generation. In this article, basic parameters of coplanar discharge are clarified by experimental and theoretical approaches. Coplanar electrodes consist of many pairs of line electrodes printed on a glass plane, and are covered with dielectric layer. The discharge properties, ozone diffusion process, and surface reaction are discussed. Finally, the scaling rule of a coplanar discharge ozone generator is demonstrated by fabrication of a 3 kg/h ozone generator. 相似文献
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The post-treatment of composting leachate via an ozonation process in laboratory scale was studied in batch mode. According to the experiments, the COD removal was 47% after 30 min of ozonation via 0.4 g/h ozone (equivalent to 2.8 mg O3/mg COD removed) at pH 9. In this circumstance, the removal of color and turbidity was also 86% and 89%, respectively. Increasing the ozone mass flow rate higher than 0.4 g/h had no considerable effect on the process variables. However, increasing the reaction time had a significant effect on both the removal of color and on COD of the leachate. Experimental data indicated that complete removal of color and 51% removal of COD were achieved after about 40 min of ozonation via 0.4 g/h ozone (equivalent to 3.3 mg O3/mg COD removed). The ozone consumption rate increased as the reaction progressed and reached 4.1 mg O3/mg COD removed after 60 min. 相似文献
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In this study, a set of municipal wastewater (MWW) samples from an actual residual water treatment plant was treated by ozone. The residual water was characterized in terms of organic load and biological contaminants: total coliforms (TC), fecal coliforms (FC) and helminth eggs (HE). Initial values of these parameters were 2.8 × 107 MPN/100 mL, 8.48 × 106 MPN/100 mL, and 470 L?1, respectively. The experimental setup considered the modification of pH and ozone dose as independent variables. Three different initial pH values (4.0, 7.0, and 11.0) and three different ozone concentrations (6, 15, and 30 mg/L) were used to investigate the pH ozone dose effect. The efficiency of ozone-based treatment was determined by the reduction of the microbiological indicators (TC, FC, and HE) and physicochemical parameters (COD and turbidity). The response surface method was used to determine suboptimal reaction conditions. These conditions were obtained using a two-stage procedure. The conditions under which both microbiological and organics were better removed corresponded to pH 7.8 and ozone concentration of 15.5 mg/L. A decline of biological indicators of 99% for TC, 99% for FC, and 99% for HE was obtained under the same reaction conditions. The reduction of chemical oxygen demand (COD) and turbidity was 75% and 85% under the same operation conditions, respectively. 相似文献