猪骨基羟基磷灰石的制备及其对铀的吸附

doi:10.11894/iwt.2019-0810

摘要/Abstract

摘要：

以猪骨为原料制备羟基磷灰石（HAP），考察了其对重金属离子铀（Ⅵ）的吸附性能，探讨体系pH、含铀废水初始浓度、羟基磷灰石用量、吸附时间、体系温度对吸附性能的影响，并研究其作用机理。结果表明，吸附剂主要组成为羟基磷灰石Ca₁₀（PO₄）₆（OH）₂，其晶体结构由短棒状结构转变为层片状结构。温度为25℃、pH为4时，羟基磷灰石吸附溶液中的铀在80 min内达到平衡，最大吸附量达到483.10 mg/g。吸附量随着体系温度的升高逐渐增大，升温有利于吸附；伪二级动力学方程能更好地拟合吸附过程，吸附行为更符合Langmuir模型。表征与吸附试验表明，吸附机理为铀（Ⅵ）与HAP活性基团的表面络合反应及离子交换反应。

关键词: 猪骨, 羟基磷灰石, 铀, 吸附

Abstract:

The hydroxyapatite(HAP) was prepared from pig bone as raw material, and its adsorption performance for heavy metal ion uranium(Ⅵ) was investigated. The impact of the system of pH, initial concentration of uranium wastewater, the dosage of hydroxyapatite, adsorption time, system temperature on adsorption properties of HAP to uranium (Ⅵ) were discussed. The results showed that the adsorbent was mainly composed of hydroxyapatite Ca₁₀(PO₄)₆(OH)₂, and its crystal structure changed from short rod structure to lamellar structure. When the temperature was 25℃ and the pH was 4, uranium in the adsorption solution of hydroxyapatite reached equilibrium within 80 min, and the maximum adsorption capacity reached 483.10 mg/g. The adsorption capacity increased gradually with the increase of system temperature, which was beneficial to adsorption. The pseudo-second-order kinetic equation can better fit the adsorption process and the adsorption behavior is more in line with the Langmuir model. Material characterization and adsorption experiments showed that the adsorption mechanism was uranium(Ⅵ) and HAP reactive surface complexation reaction and ion exchange reaction.

Key words: pig bone, hydroxyapatite, uranium, adsorption

中图分类号:

O647.3
X703

骆毅,杨金辉,黎传书,雷增江. 猪骨基羟基磷灰石的制备及其对铀的吸附[J]. 工业水处理, 2020, 40(8): 69-74.

Yi Luo,Jinhui Yang,Chuanshu Li,Zengjiang Lei. Preparation of porcine bone based hydroxyapatite and its adsorption to uranium[J]. Industrial Water Treatment, 2020, 40(8): 69-74.

https://www.iwt.cn/CN/Y2020/V40/I8/69

图/表 9

参考文献 19

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T/℃	Langmuir			Freundlich
	C_e/q_e=C_e/q_max+1/K_Lq_max			lnq_e=lnK_F+lnC_e/n
	q_max/（mg·g^-1）	K_L/（L·mg^-1）	R²	K_F/（mg·g^-1）	1/n	R²
15	689.65	0.571	0.990	318.71	0.132	0.789
25	724.64	0.484	0.986	323.19	0.153	0.796
35	746.27	0.561	0.979	333.49	0.159	0.849

T/℃	Langmuir			Freundlich
	C_e/q_e=C_e/q_max+1/K_Lq_max			lnq_e=lnK_F+lnC_e/n
	q_max/（mg·g^-1）	K_L/（L·mg^-1）	R²	K_F/（mg·g^-1）	1/n	R²
15	689.65	0.571	0.990	318.71	0.132	0.789
25	724.64	0.484	0.986	323.19	0.153	0.796
35	746.27	0.561	0.979	333.49	0.159	0.849

C₀/（mg·L^-1）	q_e/（mg·g^-1）	伪一级动力学			伪二级动力学			Morris颗粒内膜扩散模型
		ln（q_e-q_t）=lnq_e-k₁t			t/q_t=1/k₂q_e²+t/q_e			q_t=k₃t^1/2+b
		k₁	q_e	R²	k₂	q_e	R²	b	k₃	R²
100	483.10	0.076	308.58	0.917	0.319 7	497.51	0.999	370.78	12.41	0.904
130	594.49	0.069	286.20	0.915	0.000 5	613.49	0.999	456.97	14.59	0.978

C₀/（mg·L^-1）	q_e/（mg·g^-1）	伪一级动力学			伪二级动力学			Morris颗粒内膜扩散模型
		ln（q_e-q_t）=lnq_e-k₁t			t/q_t=1/k₂q_e²+t/q_e			q_t=k₃t^1/2+b
		k₁	q_e	R²	k₂	q_e	R²	b	k₃	R²
100	483.10	0.076	308.58	0.917	0.319 7	497.51	0.999	370.78	12.41	0.904
130	594.49	0.069	286.20	0.915	0.000 5	613.49	0.999	456.97	14.59	0.978

元素	C	O	Na	Mg	P	Cl	K	Ca	Sr	U
吸附前	27.14	36.71	3.19	0.34	10.66	2.76	0.26	17.57	1.37	0.00
吸附后	15.35	25.70	0.36	0.18	7.51	0.55	0.73	5.27	1.19	43.16

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