焙烧凹凸棒石矿物学特征、氨氮吸附过程与特性

邓晨; 杨炳飞

doi:10.13779/j.cnki.issn1001-0076.2020.01.004

焙烧凹凸棒石矿物学特征、氨氮吸附过程与特性

邓晨,
杨炳飞^,

河北地质大学宝石与材料工艺学院，河北石家庄 050031

基金项目:
河北省教育厅科学技术项目重点项目（凹凸棒石-蛭石协同脱氮除磷与抗菌性能调控规律与机理，ZD2018008）

详细信息

作者简介: 邓晨(1994-), 男, 河北石家庄人, 硕士研究生, 研究方向为应用矿物学

通讯作者: 杨炳飞(1979-), 男, 河北石家庄人, 教授, 硕士生导师, 研究方向为矿物材料综合利用。E-mail:u7758@126.com

中图分类号: X703

收稿日期: 2019-10-25

刊出日期: 2020-02-25

Mineralogical Characteristics, Ammonia Nitrogen Adsorption Process and Characteristics of Roasted Attapulgite

DENG Chen,
YANG Bingfei^,

School of Gem and Material Technology, Hebei GEO University, Shijiazhuang 050031, China

More Information

Corresponding author: YANG Bingfei, u7758@126.com

Received Date: 25 October 2019

Publish Date: 25 February 2020

摘要

摘要:
以天然凹凸棒石为试验样品，对其进行焙烧热处理，分析其矿物学特征并研究不同焙烧温度下凹凸棒石对模拟氨氮污水中氨氮去除过程和特性。研究结果表明，凹凸棒石经焙烧后，随着温度增加失水量逐渐增加，在达到600 ℃时，内部结构开始破坏并逐渐产生新物相。经过450 ℃焙烧热处理，凹凸棒石对氨氮去除效果最好，此时氨氮去除率为60.06%。吸附过程与准二级反应动力学方程和Langmuir等温线拟合程度高，凹凸棒石以化学吸附为主，吸附过程具有前期快速吸附、后期缓慢平衡的特征。
- 凹凸棒石 /
- 焙烧 /
- 氨氮 /
- 吸附 /
- 特性
Abstract:
Taking natural attapulgite as the experimental sample, roasted was carried out to analyze its mineralogical characteristics and study the removal process and characteristics of simulated ammonia nitrogen wastewater by attapulgite at different calcined temperatures. The results showed that the water loss gradually increased with the increase of temperature after attapulgite was roasted, and new minerals began to appear when the temperature reach 600 ℃. After roasted at 450 ℃, attapulgite had the best effect on ammonia nitrogen removal, and the ammonia nitrogen removal rate was 60.06%. The adsorption process has a high degree of fitting with the quasi-second-order reaction kinetics equation and Langmuir isotherm. Attapulgite is dominated by chemical adsorption. The adsorption process is characterized by rapid adsorption in the early stage and slow balance in the later stage.
- attapulgite /
- roasting /
- ammonia nitrogen /
- adsorption /
- feature

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图 1 天然凹凸棒石的XRD图

Figure 1.

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图 2 凹凸棒石样品热重曲线

Figure 2.

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图 3 凹凸棒石样品红外曲线

Figure 3.

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图 4 不同温度焙烧热处理对凹凸棒石氨氮去除性能的影响

Figure 4.

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图 5 热改凹凸棒石对准一级动力学方程的拟合

Figure 5.

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图 6 热改凹凸棒石对准二级动力学方程的拟合

Figure 6.

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图 7 热改凹凸棒石对Langmuir等温线的拟合

Figure 7.

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图 8 热改凹凸棒石对Freundlich等温线的拟合

Figure 8.

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表 1 样品化学成分

Table 1. Chemical compositions of the sample /%

SiO₂	Al₂O₃	Fe₂O₃	MgO	CaO	K₂O	烧失量
56.6	9.73	5.65	7.86	3.71	0.98	15.47

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表 2 吸附动力学拟合模型

Table 2. Fitting model of adsorption kinetics

Model name	Fitting equation	Note
pseudo-first order kinetics equation	ln(Q_e-Q_t)=lnQ_e-k₁t	K₁-Adsorption rate constant(1·min^-1)
pseudo-second order kinetics equation	t/Q_t=1/k₂Q₂ e+t/Q_e	K₂-Adsorption rate constant(g·(mg·min)^-1)

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表 3 吸附等温式拟合模型

Table 3. Fitting model of adsorption isotherms

Model name	Fitting equation	Note
Langmuir’s adsorption isotherm	C_e/Q_e=1/K_aQ_m+C_e/Q_m	K_a、K_f、n-Constant；Q_e-Equilibrium adsorption capacity(mg·g^-1)
Freundlich’s adsorption isotherm	lgQ_e=lgK_f+1/nlgC_e	Ce- Mass concentration of solution at adsorption equilibrium(mg·L^-1)；Qm- Saturated adsorption capacity(mg·g^-1)

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