Fabrication of recyclable Fe^(3+) chelated aminated polypropylene fiber for efficient clean-up of phosphate wastewater

Herein,a Fe^(3+)-loaded aminated polypropylene fiber has been reported as an efficient phosphate adsorbent.The remarkable phosphate removal ability of the fiber is due to Fe^(3+)immobilization,and it demonstrates a maximum adsorption capacity of 33.94 mg·P·g^(–1).Adsorption experiments showed that the fiber is applicable over a wide pH range from 2 to 9.Furthermore,the adsorption kinetics and isotherm data were consistent with the pseudo-second-order and Langmuir adsorption models,respectively.The adsorption equilibrium of the fiber for phosphate was reached within 60 min,indicating an efficient monolayer chemisorption process.Moreover,the adsorbent maintained prominent phosphate removal in the presence of competitive ions such as NO_(3)^(–)and Cl^(–),exhibiting high selectivity.More importantly,the fiber demonstrated excellent reusability(5 times)and low adsorption limit below 0.02 mg·P·g^(–1).In addition,the phosphate removal efficiency of the fiber can exceed 99%under continuous flow conditions.The adsorption mechanism was studied by X-ray photoelectron spectroscopy,showing that the adsorption of phosphate on the fiber mainly depended on the chemical adsorption of the modified Fe^(3+).Overall,this study proves that the fiber possesses many advantages for phosphate removal,including high adsorption efficiency,lower treatment limit,good recyclability,and environmental friendliness.

Does Bank Competition Promote Corporate Green Innovation?Evidence from the Location of Bank Branches

Based on the geographic coordinates of bank branches and firms,this study analyzes the impact of firm-level bank competition on corporate green innovation and its underlying mechanisms.The findings of this study are mainly as follows.First,bank competition promotes corporate green innovation by reducing transaction costs,increasing the possibility and quantity of firms applying for green patents.Second,bank competition increases the share of green innovation while reducing the share of nongreen innovation.Third,environmental regulation strengthens the promotion effect of bank competition on corporate green innovation,and the strengthening effect is greatest when environmental regulation is between its 50th and 75th quantile.The proportion of state-owned banks weakens the promotion effect of bank competition on corporate green innovation.This paper is helpfill to understand the impact of the banking system on sustainable economic development.