Metal-phenolic networks(MPNs)are a versatile class of self-assembled systems that are generating interest for applications in catalysis,bioimaging,and drug delivery.In contrast to traditional MPNs coating,in this research,we fabricated novel MPNs microspheres through a facile process in the aqueous solution.The MPNs microspheres are characterized by SEM,TEM,and XPS.The as-prepared microspheres were utilized in the removal of tetracycline(TC),methylene blue(MB),and rhodamine B(RhB).It exhibits high capacity(1331 mg/g)for the adsorption of MB,and a rapid reaction rate(186.9 mg/g/min)for the adsorption of TC.
Qiang LiuLin HanTiantian FengYing LiTao JiangJian Li
The burgeoning ethylene production in the Asia-Pacific region has led to a substantial oversupply of butadiene as a byproduct,and it is highly important to develop new butadiene-based materials.Butadiene-maleic anhydride copolymer,characterized by its amphiphilic nature,shows potential applications in adhesives,emulsifiers,etc.However,the Diels-Alder(DA)reaction of butadiene and maleic anhydride competes with the polymerization,limiting the copolymer yield.In this study,the kinetics of the DA reaction and copolymerization between butadiene and maleic anhydride were examined,and the influence of various reaction conditions on the copolymer yield was investigated.We found that the DA reaction in the induction period of the radical polymerization was the critical factor in limiting copolymer yield.Therefore,we proposed the two-step method to suppress the DA reaction and achieve high-yield production(~85%)of cross-linked microspheres with controllable particle size(175-800 nm)by self-stabilized precipitation polymerization.This work enables an efficient synthesis of conjugated diolefin-maleic anhydride cross-linked microspheres,offering a novel approach to address the issue of butadiene overcapacity.
Hong-Yi QiChen-Xi LiangMing-Sen ChenYan-Bin HuangWan-Tai Yang
Volatile Organic Compounds(VOCs)are highly harmful to human beings and other organisms,and thus the elimination of VOCs is extremely urgent.Here,La-Si co-doped TiO_(2)microsphere photocatalysts,which were prepared by a hydrothermal method,exhibited high photocatalytic activity in the decomposition of formaldehyde compared with TiO_(2).The improved activity can be attributed to the promoted separation efficiency and density of the charge carriers,as verified by the electrochemical results in combination with density functional theory calculations.In addition,the Si dopant changed the microstructure and surface acidity,while the addition of La promoted the separation efficiency of charge carriers.More interestingly,it was found that singlet oxygen was the key species in the activation of molecular dioxygen,and it played a pivotal role in the photocatalytic decomposition of formaldehyde.This work provides a novel strategy for the selective activation of dioxygen for use in the decomposition of formaldehyde.
