Catalysis of Active Carbon Supporting Transition Metal Oxides for Pyrotechnical Reagent with Potassium Perchlorate

In order to improve the pyrotechnical reagent with potassium perchlorate,composite catalyst of active carbon supporting transition metal oxides (TMO),Fe2O3 and CuO,were prepared and added into pyrotechnical reagent with potassium perchlorate.Accelerating rate calorimeter (ARC) was used to study the catalysis of pyrotechnical reagent which is consisted of potassium perchlorate and composite catalyst.Composite catalyst of both Fe2O3 and CuO supported by active carbon can catalyze pyrotechnical reagent with potassium perchlorate.Furthermore,it can lower the apparent activation energy and accelerate the reaction with a smaller quantity than that with Fe2O3 and CuO.The maximal reaction rate of pyrotechnical reagent with potassium perchlorate mixed with Fe2O3/active carbon and CuO/active carbon is 8.31 min-1 and 9.13 min-1,which is 1.74 times and 1.91 times of pyrotechnical reagent mixed with no catalyst;time to maximal rate was 18.99 min and 1.96 min respectively,which is lower than pyrotechnical reagent mixed with no catalyst by 86.46% and 98.67% ;the apparent activation energy is 368.10 kJ·mol-1 and 325.29 kJ·mol-1,which is lower than pyrotechnical reagent mixed with no catalyst by 31.89% and 39.81% respectively.     

光催化-Fenton工艺处理废纸制浆废水

为有效处理废纸制浆废水,采用氙灯照射下的光催化-Fenton技术,研究不同反应器、曝气、草酸钾、H2O2投加方式和废水质量浓度对光-Fenton工艺去除废水中TOC或吸光度的影响.结果表明,提高光照强度可提高TOC去除率;添加适量的草酸钾可提高处理效果;H2O2分两次投加可取得较好的处理效果,大大减少对催化剂的需求;在处理过程中使废水暴露于空气可提高有机物的脱氯效果,但曝气对处理效果并无益处.对于TOC为185 mg/L左右的废纸制浆废水,在[H2O2]=1000 mg/L、[Fe(Ⅱ)]=100 mg/L、pH=3.0、温度为30℃的条件下,经过30 min处理,废水的TOC可去除63%以上.     

用Fenton试剂-矿化垃圾生物反应器联合处理离子交换树脂再生废水

研究了Fenton试剂-矿化垃圾生物反应器联合处理离子交换树脂再生废水.研究结果表明：当原水CODCr为413 mg/L和过氧化氢投加量为24 mL/L（废水）时,经Fenton试剂预处理后,再经矿化垃圾生物反应器后续生化处理（运行周期为4 h,1 h进水,3 h落干,进水流量为600 mL/h）,出水CODCr降至85 mg/L左右,达到国家排放标准.     

Reaction of sodium perborate with a chlorinated cyclic hindered amine (TMP-Cl): I. Quantitative evaluation of active oxygen species in fabric bleaching

The reaction of N-chloro-4-hydroxy-2,2,6,6-tetramethylpiperidine (TMP-Cl) with sodium perborate (PB) was investigated with special reference to the generation of singlet oxygen and the possible application to a new oxidative bleaching process. Generation of the singlet oxygen (¹O₂), the hydroxyl radical (HO·) and superoxide anion radical (O₂·⁻) in the PB/TMP-Cl mixed solution was confirmed by the trapping reagent method. From the results of another experiment, in which the bleaching abilities of each active oxygen species were confirmed, the main active oxygen species contributing to the bleaching of purpurogallin, the skeleton of black tea pigment, in the PB/TMP-Cl system was concluded to be¹O₂.     

Solvent free oxidation of alcohols catalyzed by KMnO4 adsorbed on Kieselguhr

Efficient and selective oxidation of primary and secondary alcohols to the corresponding aldehydes and ketones catalyzed by potassium permanganate supported on Kieselguhr reagent under solvent free conditions are reported.     

NH_4SCN解吸剂对负载Re的D296树脂的解吸影响

为了实现离子交换树脂中吸附离子的高效解离,研究了NH_4SCN解吸剂对负载Re的D296树脂的解吸影响,并探讨了其最优解吸工艺.通过静态实验探讨了解吸时间、解吸温度,以及解吸溶液的浓度和p H值对D296树脂的解吸影响,并测定了相应的解吸曲线.结果表明,NH_4SCN解吸剂对D296树脂的最佳解吸温度为323 K,最佳pH值为10,最佳解吸溶液浓度为100 g·L~(-1).在最佳解吸工艺条件下,反应20 min后,D296树脂中Re的解吸率可达98%以上,且解吸反应为吸热反应.当NH_4SCN解吸剂的流速为2 m L·min~(-1)时,淋洗效果较好.     

Investigation into the flotation response of refractory molybdenum ore to depressant mixtures:A case study

In this paper, bulk flotation followed by separation was investigated to concentrate purified molybdenite product from Jinduicheng molybdenum ores(Shanxi province, China). The bench scale tests mainly focussed on separation of molybdenite from other sulfide minerals using the new type of depressants.The effect of each single depressant, including organic depressant-modified dextrin(MD), P-Nokes reagent(PN) and sodium trithiocarbonate(ST), and their mixtures on galena, chalcopyrite and other sulfide ores, was examined in turn by changing the concentrations used in cleaner flotation tests. Closed circuit experiments were carried out under the optimal condition and satisfying recovery and grade of molybdenite concentrate could be achieved(86.294% and 53.157%, respectively). A potential reagent regime was developed, with more environmental friendly and more economical advantages due to the introduction of modified dextrin.     

混凝-Fenton氧化联合工艺处理有机废水的试验研究

利用多种方法联合处理是废水处理技术的发展方向,通过单因素实验确定了Fenton氧化和混凝处理高浓度有机废水的最佳参数,并进行了联合工艺处理该废水的实验。结果表明:采用Fenton-混凝联合工艺处理高浓度有机废水优于混凝-Fenton法,处理后苯酚含量、CODCr和浊度分别为45.2mg/L、818.2 mg/L和0.1 NTU,去除率分别为95.5%、60.1%和99.9%。     

隔油–破乳–Fenton氧化–混凝工艺处理高浓度乳化液废水

针对某难处理高浓度乳化液废水,提出了隔油–破乳–Fenton氧化–混凝联合处理工艺.试验结果表明:乳化液废水静浮20 min除去上层浮油,在废水pH值8.0,PAC投加量8.0 g/L,0.1‰PAM投加量10 mL/L的条件下破乳效果较好.废水继续通过Fenton试剂氧化及混凝沉降处理,当Fenton氧化初始pH值3.5,H2O2(30%)投加量12 mL/L,[H2O2]/[Fe2+]=4∶1,一次性投加FeSO4·7H2O,反应时间45 min及混凝沉降pH值8.0,混凝剂投加量0.3 g/L时,处理效果令人满意.采用该工艺处理高浓度乳化液废水,其COD去除率为99.91%,浊度去除率为98.96%,石油类去除率为99.97%,处理后水质达到《污水综合排放标准》(GB8978-1996)二级标准.     

Fenton氧化/强化混凝法预处理槟榔废水的试验研究

采用Fenton氧化/强化混凝法对湖南某食用槟榔生产排放的废水进行预处理实验研究.实验结果表明：采用Fenton试剂,在初始pH值为5.0,H202投加量为247.5 g/L,Fe2投加量为1.40 g/L,反应时间为2h的条件下,CODcr去除率达到88.56％,色度去除率达到83.33％.继续采用10％的氢氧化钠对上清液进行强化混凝处理,在调节pH为9.0,反应时间为10 min的条件下,出水的CODcr可降至1980.0 mg/L,色度可降至20倍,颜色清澈,极大的消减了污染负荷,达到了良好的预处理效果.