湖南农业大学学报（自然科学版）2024，Vol.50Issue(5)：83-91,9.DOI:10.13331/j.cnki.jhau.2024.05.012
生物炭负载水滑石复合材料的制备及其对Cr(Ⅵ)的吸附性能
Preparation of biochar-loaded hydrotalcite composites and their adsorption performance on Cr(Ⅵ)
摘要
Abstract
Modified biochar-like adsorbent material BC@MnAl-LDHs was prepared by carbonation and co-precipitation method using sugarcane bagasse fibre as raw material.The effects of the dosages(0.5,1.0,2.0,3.0,4.0,5.0,6.0 g/L),initial pH of the solution(3,4,5,6,7,8),initial pollutant mass concentrations(5,10,20,40,60,80,100 mg/L),temperatures(298,303,308,313 K)and adsorption reaction times(2,15,60,120,180,240,480,600,720 min)on the adsorption of Cr(Ⅵ)were analyzed by static experiments.The X-ray diffraction(XRD),scanning electron microscopy(X-ray diffraction(XRD),scanning electron microscopy(SEM),fourier transform infrared spectroscopy(FTIR)and specific surface area and porosity analysis(BET)were used to characterize and analyze BC@MnAl-LDHs before and after adsorption of Cr(Ⅵ),as well as to analyze the adsorption mechanism.The results showed that when the dosage of BC@MnAl-LDHs was 2.0 g/L,the initial mass concentration of Cr(Ⅵ)was 10 mg/L,and the pH was 3,the removal rate of Cr(Ⅵ)could reach more than 95%.The modification improved the removal efficiency of bagasse activated carbon for Cr(Ⅵ).The adsorption isotherm of Cr(VI)by BC@MnAl-LDHs was more in line with the Freundlich adsorption model.The saturated adsorption amount of 56.42 mg/g was obtained by fitting the Langmuir model at 313 K,which was in line with the proposed second-order kinetic model,and the adsorption process was a multimolecular-layer,spontaneous,and heat-absorbing chemisorption process.BC@MnAl-LDHs containing abundant oxygen-containing functional groups contributed to its removal of Cr(Ⅵ),and the adsorption of Cr(Ⅵ)by BC@MnAl-LDHs mainly included redox,ion exchange and electrostatic adsorption.关键词
甘蔗渣/生物炭/层状双金属氢氧化物(水滑石)/BC@MnAl-LDHs复合材料/吸附性能/Cr(Ⅵ)Key words
bagasse/biochar/layered bimetallic hydroxide(hydrotalcite)/BC@MnAl-LDHs composite material/adsorption property/Cr(Ⅵ)分类
通用工业技术引用本文复制引用
贺圭益,颜智勇,刘耀驰..生物炭负载水滑石复合材料的制备及其对Cr(Ⅵ)的吸附性能[J].湖南农业大学学报（自然科学版）,2024,50(5):83-91,9.基金项目
湖南省重点领域研发计划项目(2019WK2031) （2019WK2031）
