摘要
试验以菌渣基生物炭为主要原料,采用超声波振荡复配磷矿粉和壳聚糖,通过批量水吸附试验筛选出复合材料最佳质量比;并在此基础上,从材料添加量、溶液pH、吸附时间和Cd溶液初始质量浓度方面探究菌渣基生物炭和复合材料对Cd^(2+)吸附的影响。结果表明,菌渣基生物炭、磷矿粉和壳聚糖最佳质量比为7∶1∶2;不同Cd溶液质量浓度下,复合材料对Cd^(2+)的吸附率均高于菌渣基生物炭,随着Cd溶液初始质量浓度的增加,二者的吸附率差距逐渐增加;在pH值为7、100 mg/L Cd溶液中添加0.6 g复合材料与菌渣基生物炭时,二者对Cd^(2+)的吸附率相差最大;复合材料经过5次解析后吸附率均在65%左右;加入外源离子会抑制菌渣基生物炭和复合材料对Cd^(2+)的去除率,但对复合材料的抑制效果弱于菌渣基生物炭;当Cd溶液质量浓度为100 mg/L时,菌渣基生物炭和复合材料添加量为0.6 g,振荡240 min后吸附量分别达到3.859、6.310 mg/g;复合材料对Cd^(2+)的吸附过程与拟二级动力学和Langmuir模型拟合程度较高,以单层表面的化学吸附为主;升温能有效地提高复合材料和菌渣基生物炭对Cd^(2+)的吸附量。
In this experiment,bacterial residue based biochar was used as the main raw material,and phosphate rock and chitosan were compounded by ultrasonic oscillation.The optimum ratio of the composite materials was screened by batch water adsorption test.On this basis,the effects of bacterial residue based biochar and the composite materials on Cd^(2+)adsorption were investigated from the aspects of material addition amount,solution pH,adsorption time,and initial mass concentration of Cd solution.The results showed that the optimum ratio of bacterial residue based biochar,phosphate rock,and chitosan was 7∶1∶2,at different Cd solution mass concentrations,the adsorption rate of Cd by the composite materials was higher than that by bacterial residue based biochar.With the increase of the initial mass concentration of Cd solution,the difference in adsorption rate between the two measures gradually increased.When the pH value of Cd solution was 7 and the addition amount in 100 mg/L of Cd solution was 0.6 g,the disfference in the adsorption rate of Cd by the composite material and bacterial residue based biochar was the largest.The adsorption rate of the composite material was about 65%after 5 times of desorption.The addition of exogenous ions inhibited the removal rate of Cd^(2+)by bacterial residue based biochar and the composite materials,but the inhibitory effect on the composite materials was weaker than that on bacterial residue based biochar.When the mass concentration of Cd^(2+)was 100 mg/L,the addition amount of bacterial residue based biochar and the composite materials was 0.6 g,the adsorption capacity of bacterial residue based biochar and the composite materials reached 3.859 mg/g and 6.310 mg/g respectively after 240 min of oscillation.The adsorption process of Cd^(2+)by the composite material was highly fitted with the pseudo-second-order kinetics and Langmuir model,and was dominated by chemical adsorption on the single-layer surface.Heating up could effectively improve the adsorption capacity of Cd^(2+)by the composites and bacterial residue based biochar.
作者
时佳琦
赵瑞芬
滑小赞
王森
冯悦晨
程滨
SHI Jiaqi;ZHAO Ruifen;HUA Xiaozan;WANG Sen;FENG Yuechen;CHENG Bin(College of Resources and Environment,Shanxi Agricultural University/State Key Laboratory of Integrative Sustainable Dryland and Agriculture(in preparation),Taiyuan 030031,China)
出处
《山西农业科学》
2023年第5期539-548,共10页
Journal of Shanxi Agricultural Sciences
基金
山西农业大学省部共建有机旱作农业国家重点实验室自主研发项目(202105D121008)
山西省重点研发计划(社会发展方面)项目(201803D31209-1)。
关键词
菌渣基生物炭
复合材料
镉
吸附试验
bacterial residue based biochar
the composite materials
Cd
adsorption test
