磁性银杏叶生物炭对罗丹明B的吸附特性

以银杏叶为原料,经化学共沉淀法制备磁性生物炭(MBC),用XRD、SEM、BET和FT-IR等对其进行表征。将MBC应用于溶液中罗丹明B(RB)的吸附去除,考察pH值、吸附时间、溶液初始浓度和MBC用量等对吸附效率的影响。结果表明,MBC是一种很好的吸附剂,负载的铁以Fe_3O_4的形式散布在生物炭表面;在初始RB浓度为100 mg/L,MBC投加量为0.2 g,吸附120 min后达到平衡,溶液中RB的去除率达到99.34%。吸附过程符合准一级动力学模型(R^2=0.9914),颗粒内扩散方程拟合结果表明MBC对RB吸附受到液膜扩散和颗粒内扩散共同主导。吸附等温线拟合发现Langmuir-Freundlich (R^2=0.9934)模型能很好地描述RB吸附行为。MBC是一种去除水体中RB的高效吸附剂。

Rhodamine B adsorption characteristics on magnetic biochar derived from Ginkgo Biloba

A magnetic biochar (MBC) was prepared by chemical precipitation method with Ginkgo biloba as raw material. The synthesized samples were studied systematically by X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR),scanning electron microscopy (SEM) and BET surface area. Then MBC was applied to remove Rhodamine B (RB) from wastewater. By simulation experiment,adsorption characteristic of MBC to RB was studied,and the effect of pH value,contact time,initial concentration and adsorbent dosage on adsorption capacity was investigated. The results showed that MBC was an ideal absorbent for RB removal. The iron in the MBC existed in the forms of Fe 3O 4.The maximum removal efficiency reached 99.34% under the following conditions: initial RB concentration of 100 mg/L,MBC dosage of 0.2 g and 120 min. The adsorption kinetic could be well simulated by first order model ( R ^2=0.9914). The results from the intra-particle model also showed that the adsorption process was influenced by both liquid film diffusion and intra-particle diffusion. Adsorption isotherms for MBC were fitted the Langmuir-Freundlich ( R 2=0.9934) more effectively than other models. MBC is an efficient adsorbent to remove RB from waste water of dye.