HCl浓度对水合氧化铁复合吸附剂P吸附效能的影响

赵继旭; 胡建龙; 邵立南; 郑曦; 梁存珍

doi:10.13801/j.cnki.fhclxb.20200624.001

HCl浓度对水合氧化铁复合吸附剂P吸附效能的影响

doi: 10.13801/j.cnki.fhclxb.20200624.001

赵继旭^1,,
胡建龙^1, ,,
邵立南^2,,
郑曦^2,,
梁存珍¹

1.
北京石油化工学院　机械工程学院，北京 102617
2.
矿冶科技集团有限公司，北京 100160

基金项目: 北京市教委科技计划资助项目(KM202010017005)；大学生创新训练项目(2020J00027)

详细信息

通讯作者:
胡建龙，博士，高级工程师，研究方向为工业废水深度处理与资源化　 E-mail：hujianlong@bipt.edu.cn

中图分类号: X703
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出版历程
- 收稿日期: 2020-05-21
- 录用日期: 2020-06-20
- 网络出版日期: 2020-06-28
- 刊出日期: 2021-04-08

Effect of HCl concentration on P adsorption behavior of hydrated ferrous oxide composite adsorbents

1.
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
2.
General Research Institute of Mining & Metallurgy, Beijing 100160, China

摘要

摘要: 为避免传统水合氧化铁(HFO)负载树脂复合吸附剂制备过程中大量使用HCl对设备防腐、安全及环保带来的问题，优化HFO复合吸附剂的制备工艺方法，改变负载液中HCl浓度制备得到多种HFO复合吸附剂，考察制备得到的HFO复合吸附剂对P的吸附动力学、吸附等温线、初始pH、共存离子影响、解吸再生方法等，评价负载液中HCl浓度对吸附剂吸附效能的影响。结果表明，负载液中HCl浓度由2 mol·L⁻¹降低至0.5 mol·L⁻¹，并不会显著降低HFO复合吸附剂的P吸附容量。HCl浓度为0.5 mol·L⁻¹时制备得到的HFO复合吸附剂对P的最大吸附容量为29.67 mg·g⁻¹，显著高于D201树脂载体(16.39 mg·g⁻¹)，其吸附动力学曲线更符合准一级吸附动力学模型，最佳的P吸附pH为6~8，在共存离子Cl⁻、NO₃⁻、SO₄²⁻、CO₃²⁻浓度为1.0 g·L⁻¹的条件下，吸附剂对P的吸附容量降低31.1%~53.0%。采用5wt%的NaOH溶液能有效实现吸附剂中P的解吸再生。
- 吸附剂 /
- 水合氧化铁(HFO) /
- P /
- HCl /
- 树脂
Abstract: In order to reduce the amount of HCl used in the hydrated ferrous oxide (HFO) composite adsorbents preparation process, which frequently caused serious equipment corrosion, safe and environmental problems, several adsorbents were prepared with various HCl concentrations. The effectiveness of P adsorption by the adsorbents were investigated at various perspectives, including adsorption kinetics, adsorption isotherms, effect of pH, co-existing ions and desorption methods. Experimental results demonstrate that phosphate adsorption capacity of HFO composite adsorbents doesn’t decrease significantly with the decreasing HCl concentration (from 2 mol·L⁻¹ to 0.5 mol·L⁻¹). The maximum P adsorption capacity of HFO composite adsorbent prepared at 0.5 mol·L⁻¹ HCl is 29.67 mg·g⁻¹, which is higher than the corresponding value of D201 resin (16.39 mg·g⁻¹). The adsorption kinetic curves of the adsorbents are fitted well with the pseudo first order adsorption kinetic equation. The optimal pH for P removal is 6-8. When the concentration of coexisting ions, such as Cl⁻, NO₃⁻, SO₄²⁻, CO₃²⁻, in P solution is 1.0 g·L⁻¹ respectively, the phosphate adsorption of HFO composite adsorbents decreases by 31.1%-53.0%. The adsorbed P on HFO composite adsorbents could be well desorbed with 5wt% NaOH solution.
- adsorbent /
- hydrated ferrous oxide (HFO) /
- P /
- HCl /
- resin

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图 1 D201树脂基体与HFO复合吸附剂的SEM图像与EDS图谱

Figure 1. SEM images and EDS spectra of D201 resin and HFO composite adsorbents

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图 2 D201树脂与HFO复合吸附剂吸附动力学曲线

Figure 2. Adsorption kinetic curves of D201 resin and HFO composite adsorbents

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图 3 D201树脂与HFO复合吸附剂的吸附等温曲线

Figure 3. Adsorption isotherms of D201 resin and HFO composite adsorbents

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图 4 pH对D201树脂与HFO复合吸附剂吸附容量的影响

Figure 4. Effect of pH on phosphate adsorption amount of D201 resin and HFO composite adsorbents

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图 5 共存离子对D201树脂与HFO复合吸附剂吸附容量的影响

Figure 5. Effect of co-existing ions on phosphate adsorption amount of D201 resin and HFO composite adsorbents

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图 6 D201树脂与HFO复合吸附剂的解吸再生率

Figure 6. Phosphate regeneration efficiencies of D201 resin and HFO composite adsorbents

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表 1 不同HCl浓度制备的水合氧化铁(HFO)复合吸附剂

Table 1. Hydrated ferrous oxide (HFO) composite adsorbents prepared with different HCl concentrations

HCl concentration/(mol·L⁻¹)	Adsorbent
0	D201-0 mol·L⁻¹ HCl
0.5	D201-0.5 mol·L⁻¹ HCl
1.0	D201-1 mol·L⁻¹ HCl
2.0	D201-2 mol·L⁻¹ HCl

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表 2 D201树脂与HFO复合吸附剂的P吸附动力学拟合结果

Table 2. Kinetic fitting results of P adsorption by D201 resin and HFO composite adsorbents

Adsorbent	Pseudo-first-order			Pseudo-second-order			Intra-particle diffusion
Adsorbent	k₁/min⁻¹	q_e/(mg·g⁻¹)	R²	k₂/min⁻¹	q_e/(mg·g⁻¹)	R²	C	k_dif/(mg·g⁻¹·min^−1/2)	R²
D201	0.106	9.872	0.997	0.018	10.878	0.967	3.765	0.785	0.634
D201-0 mol·L⁻¹ HCl	0.110	11.610	0.990	0.011	12.964	0.964	3.588	1.007	0.713
D201-0.5 mol·L⁻¹ HCl	0.144	13.497	0.995	0.015	14.773	0.985	5.431	1.052	0.664
D201-1 mol·L⁻¹ HCl	0.155	10.266	0.995	0.022	11.180	0.959	4.363	0.784	0.679
D201-2 mol·L⁻¹ HCl	0.152	10.532	0.954	0.013	11.714	0.992	3.392	0.897	0.726
Notes: k₁—Pseudo-first-order kinetic constant; k₂—Pseudo-second-order kinetic constant; q_e—Phosphate adsorption capacity in equilibrium; k_dif—Intra-particle diffusion rate constant; C—Reaction constant.

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表 3 D201树脂与HFO复合吸附剂的等温吸附模型拟合参数

Table 3. Isothermal adsorption model fitting parameters of D201 resin and HFO composite adsorbents

Adsorbent	Langmuir model			Freundlich model
Adsorbent	q_m/(mg·g^-1)	b/(L·mg^-1)	R²	n	K/(mg^1-1/ⁿ·L^1/ⁿ·g^-1)	R²
D201	16.39	0.075	0.851	3.066	2.855	0.971
D201-0 mol·L^-1HCl	26.67	0.316	0.914	3.329	8.321	0.981
D201-0.5 mol·L^-1HCl	29.67	0.235	0.931	3.301	8.263	0.951
D201-1 mol·L^-1HCl	29.85	0.192	0.927	3.141	7.876	0.970
D201-2 mol·L^-1HCl	28.57	0.221	0.921	3.014	7.704	0.971
Notes: q_m—Maximum adsorption capacity; b, K and n—Isotherm constants.

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