Preparation of yttrium/hydroxyapatite and purification of wastewater containing phosphorus

doi:10.16085/j.issn.1000-6613.2021-1254

Abstract

Abstract:

Nano hydroxyapatite were prepared from calcium hydroxide and sodium dihydrogen phosphate. The yttrium/hydroxyapatite composite were prepared by chemical precipitation method. The composite materials were characterized by numerous techniques including SEM-EDS, XRD and FTIR. The effects of loading ratio, pH, adsorption time and initial concentration on the adsorption performance of phosphate were investigated by static adsorption experiment. The results showed that the nano-hydroxyapatite was uniformly dispersed rice-like particles, and the XRD pattern showed that the nano-hydroxyapatite was typical. Yttrium/hydroxyapatite particles agglomerate and become larger. The intensity of characteristic peaks decreased, but no new strong characteristic peaks appeared. Adsorption studies showed that when molar mass of calcium and yttrium was 2∶1, the adsorption efficiency was the highest. The adsorption capacity of the composite increases with the increase of the initial concentration, and the maximum adsorption capacity was 116.38mg/g. The adsorption process was in accordance with the quasi-second-order kinetic model, the two-chamber first-order kinetic model and the Freundlich isothermal adsorption model. With the increase of pH in the range of 3—9, the adsorption efficiency of composites increases first and then decreases, and then reaches the maximum when pH was 5—6.

Key words: yttrium, hydroxyapatite, phosphate, adsorption, phosphorus wastewater

摘要：

以氢氧化钙和磷酸二氢钠为原料制备羟基磷灰石，通过化学沉淀法制备钇/羟基磷灰石复合材料，利用SEM-EDS（扫描电子显微镜）、XRD（X射线衍射）、FTIR（傅里叶变换红外光谱）等表征其晶体结构与形貌，并采用静态吸附实验考察吸附剂的负载比例、pH、吸附时间和初始浓度对磷酸盐的吸附性能的影响。结果显示：羟基磷灰石为分散均匀的稻米状颗粒，XRD图谱显示为典型的羟基磷灰石，钇/羟基磷灰石颗粒发生团聚且粒径变大，特征峰峰强减弱，但未出现新的强特征峰。吸附研究表明：钙与钇的摩尔比为2∶1时吸附效率最高，复合材料的吸附容量随初始浓度的增加而增大，最大吸附量为116.38mg/g，吸附过程符合准二级动力学模型、双室一级动力学模型和Freundlich等温吸附模型，吸附过程由化学吸附主导，随pH在3~9的范围增加，复合材料的吸附效率先增后减，在pH为5~6时达到最大值。

关键词: 钇, 羟基磷灰石, 磷酸盐, 吸附, 含磷废水

CLC Number:

HUANG Min, WANG Bin, ZHOU Mingluo, CHEN Shu, ZHANG Hanwen, YANG Yuankun, FU Kaibin, LIANG Hong. Preparation of yttrium/hydroxyapatite and purification of wastewater containing phosphorus[J]. Chemical Industry and Engineering Progress, 2022, 41(5): 2778-2787.

黄敏, 王彬, 周明罗, 谌书, 张瀚文, 杨远坤, 傅开彬, 梁宏. 钇/羟基磷灰石的制备及对含磷废水的净化[J]. 化工进展, 2022, 41(5): 2778-2787.

Figures/Tables 13

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元素	质量分数/%	原子分数/%	氧化物	氧化物质量分数/%
O	32.45	60.20	CaO	36.56
Ca	26.13	19.35	Y₂O₃	39.13
Y	30.81	10.29	P₂O₅	24.30
P	10.61	10.16

元素	质量分数/%	原子分数/%	氧化物	氧化物质量分数/%
O	32.45	60.20	CaO	36.56
Ca	26.13	19.35	Y₂O₃	39.13
Y	30.81	10.29	P₂O₅	24.30
P	10.61	10.16

材料	Langmuir			Freundlich
材料	q_m	K_L	R²	K_F	1/n	R²
HA-0	20.07	0.0071	0.869	1.334	0.395	0.741
	17.68	0.0084	0.853	1.468	0.364	0.688
	19.71	0.0078	0.915	1.449	0.383	0.780
Y/HA-2	99.40	0.427	0.854	43.14	0.149	0.963
	99.92	0.438	0.847	43.03	0.151	0.965
	99.69	0.452	0.848	43.19	0.151	0.962

材料	Langmuir			Freundlich
材料	q_m	K_L	R²	K_F	1/n	R²
HA-0	20.07	0.0071	0.869	1.334	0.395	0.741
	17.68	0.0084	0.853	1.468	0.364	0.688
	19.71	0.0078	0.915	1.449	0.383	0.780
Y/HA-2	99.40	0.427	0.854	43.14	0.149	0.963
	99.92	0.438	0.847	43.03	0.151	0.965
	99.69	0.452	0.848	43.19	0.151	0.962

材料	q_e（exp）	准一级吸附动力学						双室一级动力学
材料	q_e（exp）	q_e（cal）	k_1a	R²	q_e（cal）	k_2a	R²	q_e（cal）	R²
HA-0	12.27	12.28	6.84	0.989	12.68	0.972	0.989	12.25	0.992
	12.42	12.48	6.89	0.980	12.88	0.975	0.876	12.42	0.989
	11.84	12.16	7.47	0.953	12.56	1.084	0.871	12.08	0.966
Y/HA-2	48.35	44.82	7.16	0.793	46.55	0.272	0.954	47.40	0.977
	48.35	44.83	7.21	0.788	46.56	0.275	0.952	47.37	0.975
	48.34	44.84	7.10	0.801	46.58	0.269	0.956	47.40	0.966