A stable catalyst derived from waste sources has been effectively produced for the elimination of TC. The catalyst was prepared by pyrolysis of waste ore loaded onto porous biochar (BC), which improved the activation efficiency of peroxymonosulfate (PMS). The catalyst was found to contain BC and metal oxides (Fe, Co, Mg) based on the results of the characterization tests. Under optimal reaction conditions, the catalyst degraded 96.59% of TC (20 mg/L) within 60 min. Pseudo-first-order kinetic pattern was fitted on TC degradation with a rate constant of 0.028 min -1. After five cycles, the degradation efficiency was determined to be 92.55%, while the structure and physicochemical properties of the catalyst remain unchanged. Furthermore, the composite can be separated and recovered through magnetic means. In addition, based on EPR and free radical quenching experiment, PMS activated by waste ore/BC produced sulfate radical (SO4 center dot-), hydroxyl radical (HO center dot), singlet oxygen (1O2) and superoxide radical (center dot O2- ). Among them, SO4 center dot- and HO center dot played the most significant roles in TC degradation. This work provides an insight into waste resource utilization and antibiotic contamination removal.

In this study, multi-morphological g-C3N4/ Fe2O3 were prepared via hydrothermal supramolecular preorganization for the removal of formaldehyde in simulated indoor environments. We synthesized bulk, spherical and tubular g-C3N4 under hydrothermal conditions and subsequently attached Fe2O3 nanoparticles by impregnation method. Tubular g-C3N4/Fe2O3 (27.46 m2/g) and spherical g-C3N4/Fe2O3 (33.50 m2/g) synthesized through hydrothermal supramolecular preorganization method possessed the higher specific surface area than bulk g-C3N4/Fe2O3 (11.05 m2/g). Among three morphologies of g-C3N4/Fe2O3, tubular g-C3N4/Fe2O3 exhibited the best performance (65%) than bulk (41%) and spherical (59%) and possessed favorable stability. In addition, we explored and optimized the effects of different indoor simulation conditions (formaldehyde concentration, relative humidity, light source power) on the photocatalytic removal of formaldehyde. The mechanism was proposed that g-C3N4/Fe2O3 formed Z-type heterojunction to promote the separation of photo-generated electrons and holes, further generating hydroxyl radical and superoxide radical to oxidize formaldehyde.

综述了氯化聚氯乙烯(PVC-C)树脂的性能以及PVC-C管道在冷热水系统、消防系统、氯碱行业、海洋平台、电缆保护管及其他方面的应用.简述了PVC-C管道的生产和安装使用要点.最后对PVC-C管道的发展提出了建议.

Biodegradable mulch has become a substitute for polyethylene non-degradable mulch in sustainable agriculture. Compared with the traditional polyethylene film, the biodegradable film has the defects of poor water vapor barrier property, low mechanical strength and difficult control of degradation cycle. The research progress of biodegradable mulch film in improving mechanical properties and barrier properties is reviewed. The application effect of biodegradable mulch film in laying crops in short and medium growth cycle is introduced. Combined with the current research and application of biodegradable mulch, some suggestions on the research and application of biodegradable mulch were put forward and the future development trend is prospected.

Copper-manganese composite oxide (CuMnOx) catalyst was prepared through an improved solvothermal reduction by short-chain dopamine (DA) with catechol structure for catalytic oxidation of toluene. The catalyst possessed the properties of controllable morphology, adjustable size, high dispersion and excellent catalytic activity. The regular hexagonal, square and spherical crystal particles with different crystal structures were synthesized by adjusting the molar ratio of copper and manganese during the reaction. Further investigation of the performance indicated that CuMnOx - 1 (Cu:Mn = 1:1) had high catalytic combustion activity with low temperatures of T50 (205 celcius) and T90 (221 celcius). Meantime, it has favorable stability with the basically unchanged conversion efficiency in 60 h of continuous testing.

Due to the problems of its own configuration,unstable key position and insufficient heat resistance,PVC resin is easy to decompose and degrade under the heated environment,resulting in the existence of crystal points and deterioration. Therefore,stabilizer is often added to effectively prevent the degradation of PVC resin,improve the temperature resistance and ensure the product quality by blocking the reaction between molecules,forming a stable molecular structure,reducing the growth of unsaturated bonds and other principles.

We synthesized the magnetic recyclable Ti3C2 derived N-TiO2@C@Fe3O4 for photo-Fenton degradation of organic pollutants through high-temperature calcination and solvothermal methods. Ti3C2 was first calcined into TiO2@C with a homogeneous titanium source and a two-dimensional carbon framework. Then the magnetic nanoparticles (Fe3O4) were loaded by solvothermal method, which effectively solved the problem of repeated circulation of powder catalysts. N-TiO2@C@Fe3O4 could be used as an excellent co-catalyst to improve the decomposition efficiency of H2O2 in advanced oxidation processes (AOPs). This significantly reduced the amount of H2O2 and Fe2+ in the photo-Fenton system. The N-TiO2@C@Fe3O4 photo-Fenton system could degrade 96.5% of Rhodamine B (RhB) within 300 s and maintain a recycling rate of more than 90% after 10 cycles. This system also had favorable applicability to the same wastewater of antibiotics. This mechanism was proposed that the N-TiO2@C@Fe3O4 photo-Fenton system activated H2O2 to generate hydroxyl radicals (.OH) and superoxide rad-icals (.O2?) to further attack RhB. This research provided novel insights for the photo-Fenton collaborative cat-alytic system to achieve advanced oxidation treatment of pollutants in the water environment.

介绍了在冶炼炉窑非连续性生产期间,为保证制酸系统转化工序正常运行和SO2转化率,利用转化器四段升温阀门对将该部分低温烟气进行升温;合理控制投运电炉的数量,待出口烟气温度达到500℃左右时,再切换至转化器一段升温阀升温.该升温方法提高了电炉的利用率,避免了热能的浪费;节约了升温时间,降低了系统电耗.