中文关键词秸秆水合氧化锆磷酸盐吸附再生 英文关键词wheat strawhydrous zirconium oxidephosphateadsorptionregeneration

作者	单位	E-mail
邱慧	南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044	hqiu@nuist.edu.cn
秦智峰	南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044
刘凤玲	南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044
梁晨	南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044
宋明霞	南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044
许正文	南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044
管益东	南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044

中文摘要 采用3-氯-2-羟丙基三甲基氯化胺（CTA）对生物质秸秆进行胺基化改性获得St-N'，通过正交试验确定其最佳合成条件为NaOH质量分数30%、CTA体积100 mL、反应温度80℃、反应时间3h.通过原位沉积法将纳米水合氧化锆（HZO）固载于St-N'内部，制备得到生物质基纳米HZO杂化材料St-N'-Zr.SEM、TEM、XRD与BET等技术表明纳米HZO已成功负载于St-N'内部，以无定形为主，分布均匀，粒径为50~100 nm.批次吸附实验结果表明，St-N'-Zr吸附磷酸根符合Langmuir吸附等温模型，最大吸附量为33.90 mg ·g^-1；最佳吸附pH为1.8~6.0，可用于酸性水体除磷；强竞争离子体系中，磷去除率始终高于初始吸附量的70%，性能明显优于商用阴离子交换树脂D-201，吸附选择性良好.经10次吸附-解吸循环，再生性能良好，表明在水体磷污染深度治理领域具有一定应用潜力. 英文摘要 Wheat straws were modified by 3-chloro-2-hydroxypropyl trimethylammonium chloride (CTA) to obtain aminated wheat straw St-N'. The optimum synthetic conditions were determined to be NaOH with 30% mass fraction, CTA of 100 mL, reaction temperature of 80℃, and reaction time of 3 h, which was verified by orthogonal experiments. Nano-sized hydrous zirconium oxides (HZO) were immobilized into St-N' by an in situ precipitation method to obtain the nanocomposite St-N'-Zr. The SEM, TEM, XRD, and BET results indicated that the nano-sized HZO with 50-100 nm sizes were uniformly loaded onto the inner surface of the biomass-based carrier St-N' that was amorphous in nature. A Langmuir adsorption isotherm fitted the adsorption process well, and the maximum adsorption amount was calculated to be 33.90 mg·g^-1. The optimal pH range was 1.8-6.0, displaying good removal capacity of phosphate in acidic waters. In the presence of high levels of competing anions, the phosphate adsorption still retained more than 70% of the original amount, showing the higher preference of St-N'-Zr towards phosphate than towards the commercial anion exchanger D-201. After 10 cycles of adsorption-desorption, the removal efficiency remained stable, confirming the good regeneration ability and potential application of St-N'-Zr.

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