中国有色金属学报(英文版)
中國有色金屬學報(英文版)
중국유색금속학보(영문판)
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2013年
11期
3337-3345
,共9页
宋海磊%焦飞鹏%蒋新宇%于金刚%陈晓青%杜邵龙
宋海磊%焦飛鵬%蔣新宇%于金剛%陳曉青%杜邵龍
송해뢰%초비붕%장신우%우금강%진효청%두소룡
层状双金氢氧化物%钒酸根离子%吸附%动力学%热力学
層狀雙金氫氧化物%釩痠根離子%吸附%動力學%熱力學
층상쌍금경양화물%범산근리자%흡부%동역학%열역학
layered double hydroxide%vanadate%adsorption%kinetics%thermodynamics
采用共沉淀法合成Mg/Al摩尔比为2:1的层状双金属氢氧化物Mg/Al-LDH,并在500°C下煅烧6 h得到煅烧双金属氢氧化物Mg/Al-CLDH。研究Mg/Al-CLDH对钒酸根的吸附性能,探讨镁铝摩尔比、吸附剂用量、溶液初始浓度、时间和温度等因素对吸附效果的影响,并对其吸附过程的动力学和热力学过程进行研究。研究表明:Mg/Al-CLDH 对钒酸根的吸附效果很好。该吸附过程符合准一级动力学方程,平衡吸附等温线很好地符合Langmuir方程,并且Langmuir方程拟合常数高达0.999。通过热力学计算发现ΔGΘ为负值,ΔHΘ为正值,表明此吸附本质上是吸热自发过程。吸附机理研究表明此吸附主要是表面吸附。
採用共沉澱法閤成Mg/Al摩爾比為2:1的層狀雙金屬氫氧化物Mg/Al-LDH,併在500°C下煅燒6 h得到煅燒雙金屬氫氧化物Mg/Al-CLDH。研究Mg/Al-CLDH對釩痠根的吸附性能,探討鎂鋁摩爾比、吸附劑用量、溶液初始濃度、時間和溫度等因素對吸附效果的影響,併對其吸附過程的動力學和熱力學過程進行研究。研究錶明:Mg/Al-CLDH 對釩痠根的吸附效果很好。該吸附過程符閤準一級動力學方程,平衡吸附等溫線很好地符閤Langmuir方程,併且Langmuir方程擬閤常數高達0.999。通過熱力學計算髮現ΔGΘ為負值,ΔHΘ為正值,錶明此吸附本質上是吸熱自髮過程。吸附機理研究錶明此吸附主要是錶麵吸附。
채용공침정법합성Mg/Al마이비위2:1적층상쌍금속경양화물Mg/Al-LDH,병재500°C하단소6 h득도단소쌍금속경양화물Mg/Al-CLDH。연구Mg/Al-CLDH대범산근적흡부성능,탐토미려마이비、흡부제용량、용액초시농도、시간화온도등인소대흡부효과적영향,병대기흡부과정적동역학화열역학과정진행연구。연구표명:Mg/Al-CLDH 대범산근적흡부효과흔호。해흡부과정부합준일급동역학방정,평형흡부등온선흔호지부합Langmuir방정,병차Langmuir방정의합상수고체0.999。통과열역학계산발현ΔGΘ위부치,ΔHΘ위정치,표명차흡부본질상시흡열자발과정。흡부궤리연구표명차흡부주요시표면흡부。
Mg/Al-CO3 layered double hydroxide (LDH2) with Mg(II):Al(III) molar ratio of 2:1 was synthesized by co-precipitation method and its calcined product Mg2Al-CLDH(CLDH2) was prepared by heating Mg2Al-LDH at 773 K for 6 h. Removal of vanadate anion ( 3-4VO ) from aqueous solution on CLDH2 was studied. Batch studies were carried out to address various experimental parameters such as Mg/Al molar ratio, adsorbent dosage, initial concentration of solution, contact time and temperature. Vanadate was removed effectively at the optimized experimental conditions. The adsorption kinetics data fitted the pseudo-first-order model. Isotherms for adsorption vanadate by CLDH2 at different solution temperatures were well described using the Langmuir and Freundlich equations, and the isotherm parameters were calculated using linear regression analysis. The adsorption data fitted the langmuir model with good values of the correlation coefficient (R2>0.999). The negative value ofΔGΘand the positive value ofΔHΘindicate that the adsorption processes are spontaneous endothermic in nature. The mechanism of adsorption suggests that the surface adsorption is the main process.