Selective and Recyclable Congo Red Dye Adsorption by Spherical Fe<sub>3</sub>O<sub>4</sub> Nanoparticles Functionalized with 1,2,4,5-Benzenetetracarboxylic Acid.

Sci Rep · 2020 · PMC6954200 · PMID 31924827

Europe PMC DOI

hedged sentence

—

closest p

—

boldest claim

The sentences

an increasing trendno p-value reported

Due to excess protonation, the calculated zeta-potential is in the positive range till pH 5, whereas, an increasing trend of the negative surface is observed upon increasing pH above 5 because of deprotonation of –COOH groups on the surface.

also in 63,971 other papers

Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.