羟基磷灰石复合腐植酸及其对Mn(Ⅱ)的去除
Hydroxyapatite composite humic acid and its removal of Mn(Ⅱ)
裴晓港 1张鹏 2董珊珊 1葛姗姗 3赵月龙1
作者信息
- 1. 太原理工大学环境科学与工程学院,山西太原 030000
- 2. 太原理工大学环境科学与工程学院,山西太原 030000;山西师范大学现代文理学院转设筹备处,山西临汾 041075
- 3. 山西师范大学现代文理学院转设筹备处,山西临汾 041075
- 折叠
摘要
以硝酸钙和磷酸氢铵为原料,采用化学沉淀法成功合成羟基磷灰石(HAP),并将其与腐植酸(HA)复合,制备出复合吸附剂HAP-HA.通过傅里叶变换红外光谱(FT-IR)、比表面积及孔径分析、差热-热重分析(TG-DSC)及扫描电镜(SEM)等方法对样品进行表征.结果表明:腐植酸成功负载到羟基磷灰石上;HAP-HA孔径主要分布在3～5 nm,比表面积较大,且具有较好的稳定性;HAP-HA表面粗糙不平、孔隙较多,这增大了比表面积,为重金属离子提供了大量的活性位点.以Mn(Ⅱ)为目标污染物,将Mn(Ⅱ)的去除率作为指标,通过吸附实验考察吸附剂HAP-HA对污染物的吸附性能.结果表明:在常温、pH为8.0、投加量为0.15 g、吸附时间为150 min的条件下,吸附剂HAP-HA对Mn(Ⅱ)的去除率最高,可稳定达到99.0%以上;该吸附过程符合Freundlich等温吸附模型.同时,对吸附后的吸附剂进行脱附及再生吸附实验,以NaOH溶液作为洗脱剂可取得较好的脱附效果,脱附效率可达78.1%,再生循环吸附6次后HAP-HA仍具有良好的吸附性能.
Abstract
Hydroxyapatite(HAP)was successfully synthesized by chemical precipitation method using calcium nitrate and ammonium hydrogen phosphate as raw materials,and HAP-HA composite adsorbent was prepared by combining HAP with humic acid(HA).The samples were characterized by Fourier transform infrared spectroscopy(FT-IR),specific surface area and pore size analysis,differential thermal-thermogravimetric analysis(TG-DSC)and scanning electron microscopy(SEM).The results showed that humic acid was successfully loaded onto hydroxyapatite.The pore size of HAP-HA was mainly dis-tributed in 3～5 nm,the specific surface area was large,and it had good stability.The surface of HAP-HA was rough and po-rous,which increased the specific surface area and provided a large number of active sites for heavy metal ions.Taking Mn(Ⅱ)as the target pollutant and the removal rate of Mn(Ⅱ)as the index,the adsorption performance of HAP-HA on pollutants was investigated by adsorption experiments.The results showed that the removal rate of Mn(Ⅱ)by HAP-HA was the highest at room temperature,pH of 8.0,dosage of 0.15 g and adsorption time of 150 min,which could reach more than 99.0%.The adsorption process conformed to the Freundlich isothermal adsorption model.At the same time,the desorption and regeneration adsorption experiments were carried out on the adsorbent after the adsorption experiment.The NaOH solu-tion was used as the eluent to obtain better desorption effect,and the desorption efficiency could reach 78.1%.HAP-HA still had good adsorption performance after 6 regeneration cycles.
关键词
羟基磷灰石/腐植酸/吸附剂/金属Mn(Ⅱ)Key words
hydroxyapatite/humic acid/adsorbent/Mn(Ⅱ)引用本文复制引用
基金项目
山西省自然科学研究面上项目(202203021211248)
出版年
2024
NETL
NSTL
万方数据