biostudies-literatureQi JOpen Fund of Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and RecyclingNatural Science Foundation of Yunnan ProvinceNational Natural Science Foundation of ChinaNational Key Research and Development Program of China135https://www.ebi.ac.uk/biostudies/studies/S-EPMC9813190biostudies-literatureUnknown13(1)A new adsorbent with chromium removal function was synthesized by carbon thermal method using iron-containing waste Fenton sludge and carbon-containing solid waste fly ash to treat high pH scoring wastewater generated from industrial processes. The results showed that the adsorbent used T = 273.15 K, pH = 10, t = 1200 min, C₀ = 100 mg/L, had a removal rate of Cr(VI) of more than 80%, and the adsorption capacity could reach 393.79 mg/g. The characterization results show that the synthesized mesoporous nitrogen-doped composite material has a large specific surface area and mesoporous structure, and the surface of the material is rich in oxygen-containing functional groups and active sites. Compared with other studies, the adsorption capacity of the material is larger, which indicaScientific reportsStudy on adsorption of hexavalent chromium by composite material prepared from iron-based solid wastes.PMC98131902020B121201003202001AT0700882019YFC021440052060010Wu JQi JZhou PLiang XLi BYang DSu XWang ZfalseStudy on adsorption of hexavalent chromium by composite material prepared from iron-based solid wastes.A new adsorbent with chromium removal function was synthesized by carbon thermal method using iron-containing waste Fenton sludge and carbon-containing solid waste fly ash to treat high pH scoring wastewater generated from industrial processes. The results showed that the adsorbent used T = 273.15 K, pH = 10, t = 1200 min, C₀ = 100 mg/L, had a removal rate of Cr(VI) of more than 80%, and the adsorption capacity could reach 393.79 mg/g. The characterization results show that the synthesized mesoporous nitrogen-doped composite material has a large specific surface area and mesoporous structure, and the surface of the material is rich in oxygen-containing functional groups and active sites. Compared with other studies, the adsorption capacity of the material is larger, which indica2023-01-01T00:00:00Z2023 Jan2025-04-04T13:53:07.947Z2025-04-04T13:53:07.947ZS-EPMC98131903659991410.1038/s41598-023-27414-9