多环芳烃

Abstract(#br)This study describes a hydrogenation method for degrading polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) in supercritical carbon dioxide catalyzed by palladium nanoparticles stabilized in polydimethylsiloxane (Pd/PDMS). The process of synthesizing metal nanoparticles embedded in PDMS polymers involves the preparation of a homogenous mixture of metal salt, silicone elastomer, and a curing agent, followed by hydrogen reduction.

Abstract(#br)A superior solid-phase microextraction (SPME) fiber-coating material, IRMOF-3@ILs/PDMS, was prepared by the in situ growth of IRMOF-3 onto stainless-steel wires and protection with ionic liquids (ILs) and polydimethylsiloxane (PDMS). The ILs can efficiently prevent the substantial cracking of IRMOF-3 caused by moisture, and a thin PDMS film can protect the IRMOF-3@ILs material to achieve a much better extraction efficiency as well as excellent resistance to high temperature and high humidity.

Abstract(#br)The monodisperse microporous carbon nanospheres (MMCNSs) were applied in solid phase microextraction for the first time. The MMCNSs-fiber was prepared by sol–gel technique and good repeatability and reproducibility were obtained, due to the excellent monodispersity of the MMCNSs.

Abstract(#br)This paper describes a new, efficient and versatile method for the sampling and preconcentration of PAH in environmental water matrices using special hybrid magnetic carbon nanotubes. These N-doped amphiphilic CNT can be easily dispersed in any aqueous matrix due to the N containing hydrophilic part and at the same time show high efficiency for the adsorption of different PAH contaminants due to the very hydrophobic surface. After adsorption, the CNT can be easily removed from the medium by a simple magnetic separation.

室内空气污染传统上受到的关注不如室外污染，尽管室内污染物水平一般高出两倍，人们将80 ~ 90 %的生命花在增加密闭建筑上。每年有500多万人因室内空气质量差导致的疾病过早死亡，这也因员工生产力降低、物质损坏、卫生系统费用增加而造成千万富翁损失。室内空气污染物包括颗粒物、生物污染物和400多种化学有机和无机化合物，其浓度受多种室外和室内因素的影响。防止污染物在技术上并非总是可行的，因此需要实施具有成本效益的主动减排单位。迄今为止，没有任何单一的物理化学技术能够以符合成本效益的方式处理所有室内空气污染物。这个问题需要以优越的资本和运营成本为代价，使用顺序的技术配置。此外，传统物理化学技术的性能仍然受到室内环境污染物浓度低、多样性和变异性的限制。在这方面，生物技术已成为一个具有成本效益和可持续的平台，能够根据植物、细菌、真菌和微藻的生物催化作用来应对这些限制。事实上，基于生物的净化系统可以提高建筑的能效，同时提供额外的美学和心理效益。本审查批判性地评估了室内空气污染问题和预防策略的最新状况，以及室内污染物削减的物理化学和生物技术的最新进展。