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- W3015997922 abstract "为探讨纳米Fe3O4负载联合硝酸改性椰壳炭对Pb2+、Cd2+单一及复合溶液的吸附特性，通过静态吸附实验，针对吸附剂的表面特性、投加量、溶液初始pH、吸附时间、重金属初始浓度等影响因素进行了探讨，应用等温吸附模型及吸附动力学模型对吸附特性进行了研究。结果表明，纳米Fe3O4负载酸改性炭比表面积较未改性椰壳炭增加了221.03 m2·g-1，表面含氧官能团如O-H、C=O、C-O-C增加，芳香性增强，等电点提高至5.68。从经济效率角度考虑5 g·L-1为合理吸附剂用量，pH为5.0时，吸附效果最好，吸附在4 h达到平衡。准二级动力学模型对吸附的拟合度更高，吸附主要是化学吸附，吸附由快速外扩散和颗粒内扩散共同作用，Pb2+、Cd2+的吸附分别更符合Langmuir和Freundlich等温吸附模型。纳米Fe3O4负载酸改性椰壳炭对Pb2+、Cd2+的最大吸附量(Qm)分别达42.54 mg·g-1和25.79 mg·g-1，为未改性椰壳炭的1.87倍和2.23倍，复合溶液中Pb2+、Cd2+的Qm分别为单一溶液的65.16%和54.21%，这揭示了离子共存条件下的吸附竞争现象。研究表明，纳米Fe3O4负载联合硝酸改性提高了椰壳炭对Pb2+、Cd2+的吸附能力，且Pb2+的吸附性能及吸附竞争性优于Cd2+。" @default.
- W3015997922 created "2020-04-17" @default.
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- W3015997922 date "2020-03-10" @default.
- W3015997922 modified "2023-09-26" @default.
- W3015997922 title "纳米Fe 3 O 4 负载酸改性炭对水体中Pb 2+ 、Cd 2+ 的吸附" @default.
- W3015997922 doi "https://doi.org/10.13254/j.jare.2019.0475" @default.
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