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A Zn-MOF modified by silver nanoparticles (Ag@1) was synthesized by deposition reduction method. Ag@1 can serve as multi-response fluorescence sensor to detect pesticides, Trp and EDA, showing excellent sensitivity and selectivity. In particular, Ag@1 showed "turn-off" fluorescence sensing for FLU and EDA, and "turn-on" fluorescence sensing for EMB and Trp. It is also effective in detecting pesticides in simulated water and amino acids in fresh fetal bovine serum. In addition, due to its good photocatalytic activity, it can effectively degrade MB. [Display omitted] • Ag@1 was synthesized by deposition of silver nanoparticles on Zn-MOF surface. • Ag@1 showed "turn-off" fluorescence sensing for FLU and EDA. • Ag@1 showed "turn-on" fluorescence sensing for EMB and Trp. • It can effectively detect pesticides in water samples and Trp in fetal bovine serum. • Ag@1 can be used as a photocatalyst to effectively degrade the MB in water. The abuse of pesticides, antibiotics, organic solvents, etc., not only deteriorates the ecological environment, but even affects the normal development of organisms, posing a serious threat to global public health. Efficient and sensitive detection of pesticides, antibiotics, organic solvents and so on are very important, but also a challenge to scientists. By depositing Ag nanoparticles on the surface of Zn-MOF (1 : {[Zn 2 (bta)(bpy)(H 2 O) 2 ]·2H 2 O} n), a new type of composite material (Ag@ 1) was successfully synthesized and analyzed by TEM, EDS, XPS, XRD, IR and other characterization methods. Ag@ 1 can serve as multi-response fluorescence sensor to detect pesticides (fluazinam (FLU) and emamectin benzoate (EMB)), Tryptophan (Trp) and Ethylenediamine (EDA). In particular, Ag@1 showed "turn-off" fluorescence sensing for FLU and EDA, and "turn-on" fluorescence sensing for EMB and Trp. It is worth mentioning that we further explored its analysis of FLU and Trp in real water samples and fetal bovine serum. The recoveries are satisfactory, 97.95 % − 102.39 % and 96.69 % − 101.85 %, respectively. In addition, the photocatalytic performance of Ag@ 1 was found to be excellent, the degradation rate of methylene blue (MB) reached 86 %, and its degradation mechanism was discussed. [ABSTRACT FROM AUTHOR]

• Two new types of Zn-MOF { [Zn(CIA2−)(4,4′-BB)]·0·75H 2 O} n and Co-MOF [Co(CIA2−)(4,4′-BB)·H 2 O] n were synthesized by solvothermal method. • Zn-MOF sensor can achieve the quantitative detection of His, TC, NB and PTH with high sensitivity and selectivity. • Co-MOF can be used as a photocatalyst to photo-catalyze the basic fuchsin and methylene blue dyes. In this paper, two metal-organic frameworks { [Zn(CIA)(4,4′-BB)]·0·75H 2 O} n (1) and [Co(CIA)(4,4′-BB)·H 2 O] n (2) were synthesized by using ligands 5-methoxyisophthalic acid (5-H 2 CIA) and 4,4′-bis((1 H -imidazol-1-yl)methyl)-1,1′-biphenyl (4,4′-BB) under solvothermal conditions. The structures were characterized by TG, IR, PXRD, BET, single-crystal X-ray diffraction and elemental analysis. The results show that 1 and 2 form a three-dimensional structure, where 1 and 2 have good thermal stability. Further study reveals that 1 shows good fluorescence properties and can be used as a fluorescence sensor to detect histidine (His), nitrobenzene (NB), tetracycline (TC) and pyrimethanil (PTH) in water. (LOD: His 0.23 μM, TC 0.17 μM, PTH 0.08 μM, NB 0.03 μM). However, 2 shows better photocatalytic activity and can be used to degrade dyes in water, such as BF (basic fuchsin) and MB (methylene blue). Under visible light irradiation, the degradation rate of BF is 95.5 % and that of MB is 76.1 %. Finally, the mechanism of detection of 1 as a fluorescence probe and the mechanism of photocatalytic degradation of 2 are discussed. Zn-MOF (1) fluorescence sensor was synthesized by hydrothermal method using carboxylic acid and imidazole. The 1 as a fluorescent probe has high sensitivity, selectivity, anti-interference and circulation ability for His-TC PTH and NB. Co-MOF (2) was synthesized by the same method. It is found that 2 can be used as photocatalyst for degradation of BF and MB dyes under visible light. Finally, the detection mechanism of 1 and the degradation mechanism of 2 were discussed. [Display omitted] [ABSTRACT FROM AUTHOR]