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Characterization results showed that the surface of the PFTS\u2013PDMDAAC was a three\u2010dimensional network polymer of chain molecules that exhibited good thermal stability and formed an amorphous polymer containing multiply hydroxyl\u2010bridged titanium and iron. When n(OH<jats:sup>\u2212<\/jats:sup>)\u00a0:\u00a0n(Fe)\u2009=\u20091:2, n(PO<jats:sub>4<\/jats:sub><jats:sup>3\u2212<\/jats:sup>)\u00a0:\u00a0n(Fe)\u2009=\u20090.35, n(Ti)\u00a0:\u00a0n(Fe)\u2009=\u20091:8, n(DMDAAC)\u00a0:\u00a0n(Fe)\u2009=\u20095:100, and the polymerization temperature is 60\u00b0C, the prepared composite flocculant has the best effect. The effects of dosage, pH, and agitation intensity on the flocculation properties of PFTS\u2013PDMDAAC were also studied. The optimal removal rates of PS\u2010\u03bcm and haze by PFTS\u2013PDMDAAC were 85.60% and 90.10%, respectively, at a stirring intensity of 200\u2009rpm, a pH of 9.0, and a PFTS\u2013PDMDAAC dosage of 20\u2009mg\/L. The flocs produced by the PFTS\u2013PDMDAAC flocculation were large and compact in structure, and the flocculation mechanism was mainly based on adsorption bridging. Kaolin played a promoting role in the process of PS\u2010\u03bcm removal by PFTS\u2013PDMDAAC floc and accelerated the formation of large and dense flocs. This study provided a reference for the coagulation method to remove micro\u2013nanopollutants in the actual water treatment process.<\/jats:p><\/jats:sec><jats:sec><jats:title>Practitioner Points<\/jats:title><jats:p><jats:list list-type=\"bullet\">\n<jats:list-item><jats:p>A composite flocculant with rich spatial network structure (PFTS\u2013PDMDAAC) was prepared.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>PFTS\u2013PDMDAAC can effectively remove micro\u2013nano polystyrene (PS) in wastewater.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>The floc produced by PFTS\u2013PDMDAAC is large and compact in structure.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>The flocculation mechanism of PFTS\u2013PDMDAAC is mainly adsorption bridging.<\/jats:p><\/jats:list-item>\n<\/jats:list><\/jats:p><\/jats:sec>","DOI":"10.1002\/wer.10969","type":"journal-article","created":{"date-parts":[[2023,12,27]],"date-time":"2023-12-27T08:19:05Z","timestamp":1703665145000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Preparation of composite coagulant for the removal of microplastics in water"],"prefix":"10.1002","volume":"95","author":[{"given":"Yongjun","family":"Sun","sequence":"first","affiliation":[{"name":"College of Urban Construction Nanjing Tech University  Nanjing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qu","family":"Wu","sequence":"additional","affiliation":[{"name":"College of Urban Construction Nanjing Tech University  Nanjing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaoqi","family":"Li","sequence":"additional","affiliation":[{"name":"College of Urban Construction Nanjing Tech 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