典型文献
Hydrothermal synthesis of zeolites-calcium silicate hydrate composite from coal fly ash with co-activation of Ca(OH)2-NaOH for aqueous heavy metals removal
文献摘要：
Coal fly ash is a typical secondary aluminum/silicon resource.The preparation of zeolite-type absorbent is a potential way for its value-added utilization,while the purity and adsorption property of zeolite are limited due to the occurrence of side reactions in the synthesis process.In this study,a designated com-posite consisted of crystalline zeolites and amorphous calcium silicate hydrate was selected,which was direct synthesized from fly ash under conditions of a Ca/Si molar ratio of 0.8,an initial NaOH concentra-tion of 0.5 mol/L,a hydrothermal temperature of 170℃and a liquid-solid ratio of 15 mL/g.The results indicated that this composite had superior adsorption property for a variety of heavy metals,which was based on the exchange of calcium and sodium ions in zeolites and calcium silicate hydrate.Its adsorption capacities for Pb2+,Ni2+,Cd2+,Zn2+,Cu2+and Cr3+attained 409.4,222.4,147.5,93.2,101.1 and 157.0 mg/g,respectively,in single solution with a pH of 4.5.After regulating the synthesis conditions,the transforma-tion of amorphous calcium silicate hydrate into crystallized tobermorite weakened the adsorption capac-ity of the composite.Besides,due to the competitive adsorption in a multiple ions solution,the adsorption capacities for these heavy metals had a reduction.
文献关键词：
中图分类号：
作者姓名：
Guanghui Li;Min Li;Xin Zhang;Pengxu Cao;Hao Jiang;Jun Luo;Tao Jiang
作者机构：
School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China
文献出处：
引用格式：
[1]Guanghui Li;Min Li;Xin Zhang;Pengxu Cao;Hao Jiang;Jun Luo;Tao Jiang-.Hydrothermal synthesis of zeolites-calcium silicate hydrate composite from coal fly ash with co-activation of Ca(OH)2-NaOH for aqueous heavy metals removal)[J].矿业科学技术学报（英文版）,2022(03):563-573
A类：
Cr3+attained,tobermorite
B类：
Hydrothermal,synthesis,zeolites,calcium,silicate,hydrate,composite,from,coal,fly,ash,activation,NaOH,aqueous,heavy,metals,removal,Coal,typical,secondary,aluminum,silicon,resource,preparation,type,absorbent,potential,way,its,value,added,utilization,while,purity,adsorption,property,are,limited,due,occurrence,reactions,process,In,this,study,designated,consisted,crystalline,amorphous,was,selected,which,direct,synthesized,under,conditions,Si,molar,initial,concentra,hydrothermal,temperature,liquid,solid,results,indicated,that,had,superior,variety,exchange,sodium,Its,capacities,Pb2+,Ni2+,Cd2+,Zn2+,Cu2+and,respectively,single,solution,After,regulating,transforma,into,crystallized,weakened,Besides,competitive,multiple,these,reduction
AB值：
0.509857
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