常压制备秸秆活性炭对水溶液中磷元素的吸附

Adsorption of phosphorus from aqueous solution on activated stalk-carbon prepared under condition of atmosphere

开发了非真空制备秸秆活性炭的新方法,以稻草秸秆为原料,醋酸钙和氯化锌为活化剂,经热处理,一步合成改性秸秆活性炭。XRD图谱显示,产物为碳酸钙改性活性炭;SEM和TEM的表征结果显示,该活性炭具有微米-纳米多维孔结构,碳酸钙颗粒均匀分布在活性炭的表面和基体中;BET比表面积实验测得不同浓度碳酸钙改性活性炭的比表面积在324~846 m2/g之间。含磷水溶液吸附实验表明,当改性活性炭中碳酸钙含量为1.5%时,活性炭具有最大吸附速率1.76 L/mg;碳酸钙含量为2.0%时,活性炭具有最大吸附容量3.21 mg/g。改性活性炭对磷元素的吸附过程符合Langmuir模型,说明改性活性炭对磷的吸附为单分子层吸附。

A new method was developed to prepare composite of Ca CO3/ activated carbon under the condition of atmosphere by one step,in which Ca( CH3COO)2and Zn Cl2 were adopted as activation agent. The prepared composite was characterized by XRD,SEM and TEM,showing that Ca CO3 particles were loaded on the activated carbon with multi-porous structure,moreover the composite had high specific surface area of 324 ~ 846m2/ g. The final sorbent was used for phosphorus removal,and the results showed that the hybrid containing1. 5% of Ca CO3 had the highest absorption rate of 1. 76 L / mg,while the largest adsorption capability was 3. 21 mg / g when the sorbent contained 2. 0% of Ca CO3. The absorption process fit Langmuir isotherm model well,which indicated that the process was monolayer adsorption.