Accelerated oxidation of VOCs via vacuum ultraviolet photolysis coupled with wet scrubbing process

Vacuum ultraviolet(VUV) photolysis is a facile method for volatile organic compounds(VOCs) elimination, but is greatly limited by the relatively low removal efficiency and the possible secondary pollution. To overcome above drawbacks, we developed an efficient method for VOCs elimination via VUV photolysis coupled with wet scrubbing process. In this coupled process, volatile toluene, a representative of VOCs, was oxidized by the gas-phase VUV photolysis, and then scrubbed into water for further oxidation by the liquid-phase VUV photolysis. More than 96% of toluene was efficiently removed by this coupled process, which was 2 times higher than that in the gas-phase VUV photolysis. This improvement was attributed to the synergistic effect between gas-phase and liquid-phase VUV photolysis. O3and HO·are the predomination reactive species for the toluene degradation in this coupled process, and the generation of O3in gas-phase VUV photolysis can efficiently enhance the HO·production in liquid-phase VUV photolysis. The result from in-situ proton transfer reaction ionization with mass analyzer(PTR-MS) further suggested that most intermediates were trapped by the wet scrubbing process and efficiently oxidized by the liquid-phase VUV photolysis, showing a high performance for controlling the secondary pollution. Furthermore, the result of stability test and the reuse of solution demonstrated that this coupled process has a highly stable and sustainable performance for toluene degradation. This study presents an environmentally benign and highly efficient VUV photolysis for gaseous VOCs removal in the wet scrubbing process.

分子印迹聚合物用于环境内分泌干扰物的检测与去除

环境内分泌干扰物对人体健康和生态环境具有严重危害,发展高效的环境内分泌干扰物检测方法与去除技术具有重要意义。由于拥有高度的吸附选择性、较大的吸附容量和良好的可重复利用性,分子印迹聚合物在环境内分泌干扰物的检测与去除方面得到了诸多应用。本文介绍了分子印迹聚合物的制备方法及性能特点,综述了近年来基于分子印迹聚合物的固相萃取技术和传感器技术在环境内分泌干扰物的灵敏、特异性检测中的应用,以及基于分子印迹聚合物的吸附技术与其他方法的联用技术用于环境内分泌干扰物的选择性高效去除,并分析了分子印迹聚合物在合成和使用方面存在的问题,展望了其应用前景。

Molecular mechanism analysis of ZmRL6 positively regulating drought stress tolerance in maize

MYB-related genes,a subclass of MYB transcription factor family,have been documented to play important roles in biological processes such as secondary metabolism and stress responses that affect plant growth and development.However,the regulatory roles of MYB-related genes in drought stress response remain unclear in maize.In this study,we discovered that a 1R-MYB gene,ZmRL6,encodes a 96-amino acid protein and is highly drought-inducible.We also found that it is conserved in both barley(Hordeum vulgare L.)and Aegilops tauschii.Furthermore,we observed that overexpression of ZmRL6 can enhance drought tolerance while knock-out of ZmRL6 by CRISPR-Cas9 results in drought hypersensitivity.DAP-seq analyses additionally revealed the ZmRL6 target genes mainly contain ACC GTT,TTA CCA AAC and AGC CCG AG motifs in their promoters.By combining RNA-seq and DAP-seq results together,we subsequently identified eight novel target genes of ZmRL6 that are involved in maize’s hormone signal transduction,sugar metabolism,lignin synthesis,and redox signaling/oxidative stress.Collectively,our data provided insights into the roles of ZmRL6 in maize’s drought response.