Development of a Fibrous Adsorbent Prepared Via Green Vapor-Phase Grafting Polymerization for Uranium Extraction.

Owing to many problems of the detriment by large amount of organic reagents, high cost and difficulty of industrialization, development of high-efficiency economical technologies for uranium extraction is an irresistible trend to support steady supply of nuclear energy. Herein, a novel fibrous adsorbent, named as AO-HPE fibers, was prepared by introduction of amidoxime groups using the green vapor-phase grafting polymerization (VPGP) technology of monomer acrylonitrile (AN). Gaseous AN was grafted onto the ultra high molecular weight polyethylene (UHMWPE) fibers at 80 °C in the enclosed evaporation and condensation reflux system. The innovative technology not only endowed synthetic process high monomer utilization ratio but also excellent environmental friendliness. The AO-HPE fibers exhibited an appreciable calculated maximum adsorption capacity (Q m) of 1144.94 mg·g-1 in uranium solution and an adsorption capacity of 14.11 mg·g-1 in simulated seawater. Meanwhile, the higher uranium selectivity than main competing ion vanadium (adsorption mass ratio was almost 5) was achieved. The adsorption process accorded closely with chemisorption mechanism. This work provided a novel idea for the synthetic method of adsorbents for uranium extraction, and inspired the sustainable technologies for grafting polymerization of monomer AN.

Quantitative structure-activity relationship (QSAR) directed the discovery of 3-(pyridin-2-yl)benzenesulfonamide derivatives as novel herbicidal agents.

BACKGROUND: Agrochemicals have been crucial to the production of food, and the need for the development of novel agrochemicals continues unceasing owing to the loss of existing produces via the growth of resistance and the desire for products with more propitious environmental and toxicological patterns. RESULTS: The results of both CoMFA and CoMSIA models indicated that biological activity can effectively be improved through the structural optimisation and molecular design of these synthetic compounds from the aspects of steric, electrostatic, hydrophobic, hydrogen bond donor and acceptor fields. Data of postemergence herbicidal activity in the greenhouse explained that most new 3-(pyridin-2-yl)benzenesulfonamide derivatives (4c-4 t) could control highly effectively against barnyardgrass, foxtail, vetleaf, and youth and old age (herbicidal activity ≥90%); for example, compounds 4q-4 t exhibit excellent biological activity equivalent/superior to commercial saflufenacil/sulcotrione at the low concentration of 37.5 g a.i./ha, and in particular, the herbicidal activity of compound 4 t for four experimental plant species is found to be notably greater than saflufenacil (3.75 g a.i./ha). Meanwhile, compound 4 t also has good crop selectivity for weed control in maize. CONCLUSION: The novel compounds such as 4 t have remarkable biological activity after the structural optimisation utilising the constructed 3D-QSAR models, i.e. such QSAR models have great accuracy. © 2017 Society of Chemical Industry.

Cause of the lacrimal duct obstruction reoccured after lacrimal duct stent operation / 国际眼科杂志(Guoji Yanke Zazhi)

·AIM: To discuss the cause of lacrimal duct obstruction relapsed after lacrimal duct stent operation.·METHODS:A total of 523 patients(523 eyes) of lacrimal duct obstruction were enrolled. They were given regular examination of the eyes and nose before lacrimal duct stent operation. We analyzed the correlation between the lacrimal duct obstruction and the relevant disease. And 280 cases reoccurred lacrimal duct obstruction during the average 2a follow-up. The causes correlated with the relapsed obstruction were assessed.·RESULTS: Lacrimal duct obstruction mostly occurred secondary to the inflammation of conjunctiva or nasal mucosa. The upper site obstruction correlated with the chronic conjunctivitis, while the lower site obstruction related to the hypertrophy of inferior turbinate. Outcome of some cases were discouraging after the stents removed. The removal of the ring silicone tube usually leaded to the upper site obstruction, while the lower site obstruction usually caused by the removal of spherical silicone tube.· CONCLUSION: Lacrimal duct stent operation is a simple, safe and outpatient treatment. But the long-term effectiveness is not encouraging. We should make personal treatment according to the etiological factor, the site of the obstruction, age, and the procedure of treatment.

Synthesis and evaluation of substituted 3-(pyridin-2-yl)benzenesulfonamide derivatives as potent herbicidal agents.

In an attempt to obtain novel candidate compound for weed control, a series of newly substituted 3-(pyridin-2-yl)benzenesulfonamide derivatives 2 were designed and synthesized using compound II7 as a lead compound by Intermediate Derivatization Methods and their herbicidal activities were evaluated. The herbicidal activity assay in greenhouse tests showed several compounds (2g, 2i, 2j, 2k, 2l, 2m, 2n and 2o) exhibited significant herbicidal activity for controlling velvet leaf (Abutilon theophrasti medic.) and youth-and-old age (Zinnia elegans jacq.) at 37.5ga.i./ha. In particular, 2h was found to be the most potential candidate herbicide and was proved higher activity than the lead compound II7. The result of the weed controlling spectrum test showed that 2h could effectively control dayflower (Commelina tuberosa), bur beggarticks (Bidens tripartita linn.), youth-and-old age, cassia tora (Cassiaobtusifolia L.), velvet leaf, purslane (Portulaca oleracea) and false daisy (Eclipta prostrata L.). In addition, the mixture of compound 2h and propanil could produce a synergistic effect and enhance herbicidal activity. The result of the herbicidal activity assay in field test demonstrated that 2h could effectively control dayflower and nightshade (Disambiguation) with long-lasting persistence. The present work indicates that 2h may be a novel compound candidate as a potential herbicide.

Design, synthesis, and herbicidal activity of novel substituted 3-(pyridin-2-yl)benzenesulfonamide derivatives.

A series of novel substituted 3-(pyridin-2-yl)benzenesulfonamide derivatives were designed and synthesized using 2-phenylpridines as the lead compound by intermediate derivatization methods in an attempt to obtain novel compound candidates for weed control. The herbicidal activity assay in glasshouse tests showed several compounds (II6, II7, II8, II9, II10, II11, III2, III3, III4, and III5) could efficiently control velvet leaf, youth-and-old age, barnyard grass, and foxtail at the 37.5 g/ha active substance. Especially, the activities of II6, II7, III2, and III4 were proved roughly equivalent to the saflufenacil and better than 95% sulcotrione at the same concentration. The result of the herbicidal activity assay in field tests demonstrated that II7 at 60 g/ha active substance could give the same effect as bentazon at 1440 g/ha active substance to control dayflower and nightshade, meanwhile II7 showed better activity than oxyfluorfen to control arrowhead and security to rice. The present work indicates that II7 may be a novel compound candidate for potential herbicide.