Loose nanofiltration (LNF) membranes with high dyes/salts selectivity and superior anti-fouling performance are urgently needed for treating textile wastewater.Herein, we prepared a polyamide (PA) LNF membrane through reaction of monomer 3,5-diaminobenzamide (3,5-DABA) with trimesoyl chloride (TMC).The presence of an electron-withdrawing and hydrophilic formamide substituent group on the 3,5-DABA monomer not only enhanced the membrane surface hydrophilicity, but also significantly influenced the IP film forming reaction process, leading to a looser and smoother separation layer.The optimized 3,5-DABA/TMC membrane exhibited a high water permeance of 24.62 LMH bar^-1 and > 99 % retention for anionic dyes such as Eriochrome Black T (EBT), Methyl blue (MB), and Congo red (CR), as well as 97.5 % rejection for Acid Fuchsin (AF).Simultaneously, it also showed super-low (<5 %) rejection for monovalent anionic salts, achieving a superior selectivity (172.8) for CR/NaCl mixturesAddnl., the membrane showed superior anti-fouling performance due to its neg. charged, hydrophilic, and relatively smooth surface.These results confirm its potential for saline textile wastewater treatment.This study presents a novel monomer candidate to fabricate outstanding LNF membranes.

2024-07-01·Russian Journal of General Chemistry

Synthesis and Herbicidal Activity of (3,5-Dinitrophenyl)-4-(benzyloxymethyl)oxazole Derivatives

作者: Bai, Z. ; Jin, C. ; Bai, H. ; Li, Z. ; Han, J. ; Li, H. ; Luo, D.

A series of novel (3,5-dinitrophenyl)-4-(benzyloxymethyl)oxazole derivatives was designed, synthesized and characterized by ¹H, ¹³C NMR and HRMS data.The spatial structure of 4-[(2-chlorophenoxy)methyl]-2-(3,5-dinitrophenyl)oxazole was determined by single crystal X-ray diffraction method.Herbicidal activity of the target compounds was evaluated using Echinochloa crusgalli, Lolium perenne, Lactuca sativa, and Medicago sativa as tested species.According to the exptl. results, most compounds demonstrated good pre-emergence herbicidal activity. 4-[(3-Bromo-5-chlorophenoxy)methyl]-2-(3,5-dinitrophenyl)oxazole exhibited relatively better pre-emergence efficacy against the four tested weeds when considering the overall control effect.It reveals that 4-[(3-bromo-5-chlorophenoxy)methyl]-2-(3,5-dinitrophenyl)oxazole could serve as a pre-emergence herbicide lead, and the need for further structural optimization and adjustment of the herbicide.

2024-05-01·Food Chemistry

Efficient detection of aklomide/nitromide based on a sensor of MPA capped CdTe QDs using fluorescence quenching method

Article

作者: Yang, Bin ; Wang, Yuting ; Liu, Xin ; Liu, Jia ; Niu, Shiyue ; Zhang, Fengming ; Bi, Shuyun

Based on the fluorescence sensor of 3-Mercaptopropionic acid (MPA) capped CdTe quantum dots (QDs), two novel detection methods for aklomide and nitromide were developed. The MPA-CdTe QDs were synthesized and characterized by transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), ultraviolet visible (UV-vis) and fluorescence (FL). The quenchings were all static. The binding constants (K_a) at different temperatures were obtained. Electrostatic forces were the main forces for the two bindings. For the detection of aklomide and nitromide, under the optimal conditions, the effects of some metal ions, glucose, bovine serum albumin (BSA) and congeneric drug on the determination were explored. The standard equations were established and the limits of detection (LOD) were 0.0215 and 0.0388 μg mL^-1 (3S₀/S), repectively. The methods were applied to analyse the samples of chicken and duck, the recoveries were 99.41 % - 101.24 % with RSDs of 0.29 % - 1.19 % (n = 5).

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