负载改性钾长石吸附废水中苯酚的研究

doi:10.11962/1006-4990.2020-0135

摘要/Abstract

摘要：

以钾长石为原料,采用氧化钙和硅酸钠对其进行负载,使其具有更多的微介孔结构,再用十六烷基三甲基溴化铵对其改性,合成得到的钾长石负载改性物（CK）对废水中苯酚进行吸附。考察了CK添加量、溶液初始pH、吸附时间、苯酚初始浓度等因素对CK吸附苯酚的影响,并结合动力学及热力学模型进行拟合探究其吸附机理。结果表明,苯酚去除率随着CK添加量的增加而增加;溶液呈中性时吸附效果较佳;吸附在1 h时开始趋于平衡;随着苯酚初始质量浓度（50~3 000 mg/L）的增加,CK对苯酚的吸附量可增至30.32 mg/g并趋于饱和,该值是原材料的9倍多。准二级动力学模型和Freundlich等温吸附模型能较好地描述CK对苯酚的吸附过程,说明该过程以化学吸附为主。Langmuir、Freundlich等温吸附模型均能说明钾长石经负载改性后有利于吸附废水中的苯酚。

关键词: 钾长石, 负载改性, 苯酚废水

Abstract:

Potassium feldspar was used as the raw material to loaded calcium oxide and sodium silicate for more micro-meso-porous,then it was modified with hexadecyl trimethyl ammonium bromide.The synthesized modifier loaded potassium feldspar （CK） was used to adsorb the phenol in wastewater.The effects of the amount of CK,initial pH of solution,adsorption time,initial concentration of phenol and other factors on the phenol adsorption of CK was investigated.In addation,the kinetic and thermodynamic models were used to investigate the adsorption mechanism.Results showed that the removal rate of phenol in-creased with the CK amount.The better adsorption effect was obtained in the neutral solution.Adsorption began to reach equi-librium at 1 h;with the increase of the initial concentration of phenol（50~3 000 mg/L）,the adsorption capacity of CK increa-sed to 30.32 mg/g and tended to saturation,which was 9 times higher than that of the raw material.Quasi-second-order kinetic model and Freundlich isothermal adsorption model can better describe the process of CK adsorption of phenol,which showed that chemical adsorption was the main process.Langmuir and Freundlich isothermal adsorption models showed that potassium feldspar was favorable to adsorb phenol in wastewater after loading modification.

Key words: potassium feldspar, load modification, phenol wastewater

中图分类号:

TQ131.13

韩琮,孙丽娜,张婷,朱慧霞,李玲. 负载改性钾长石吸附废水中苯酚的研究[J]. 无机盐工业, 2021, 53(2): 71-76.

Han Cong,Sun Lina,Zhang Ting,Zhu Huixia,Li Ling. Study on adsorption of phenol in wastewater by loading modified potassium feldspar[J]. Inorganic Chemicals Industry, 2021, 53(2): 71-76.

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序号	因素				f/%
序号	A m（YK）∶ m（氧化钙）	B w（硅酸钠）/ %	C w（CTMAB）/ %	D 搅拌时间/ h	f/%
1	1∶0.3	4	1.2	0.5	52.85
2	1∶0.3	6	1.1	1.0	62.08
3	1∶0.3	8	1.0	2.0	51.55
4	1∶0.2	4	1.1	2.0	37.20
5	1∶0.2	6	1.0	0.5	41.47
6	1∶0.2	8	1.2	1.0	43.77
7	1∶0.4	4	1.0	1.0	43.47
8	1∶0.4	6	1.2	2.0	48.94
9	1∶0.4	8	1.1	0.5	53.75
K₁	55.49	44.51	48.52	49.36
K₂	40.81	50.83	51.01	49.77
K₃	48.72	49.69	45.50	45.90
R	14.68	6.32	5.51	3.87

样品	比表面积/（m²·g^-1）	总孔体积/（cm³·g^-1）	平均孔径/nm
YK	3.480 0	0.009 0	10.344 8
CK	72.034 5	0.172 2	9.562 1

准一级动力学方程	参数
准一级动力学方程	q_e/（mg·g^-1）	k₁/（mg·g^-1·min^-1）	R²
ln （q_m-q_t）=ln q_e-k₁t	0.076 0	0.004 1	0.361 0
准二级动力学方程	参数
准二级动力学方程	q_e /（mg·g^-1）	k₂/（g·g^-1·min^-1）	R²
t/q_t=1/k₂q_e²+t/q_e	3.196 9	0.193 5	0.999 9
颗粒内扩散方程	参数
颗粒内扩散方程	C	k_i /（mg·g^-1/2·min^-1/2）	R²
q_t=k_i t^1/2+C	3.026 2	0.060 8	0.309 3

Langmuir方程	参数
Langmuir方程	q_m /（mg·g^-1）	K_L/（L·mg^-1）	R²
ρ_e/q_e=ρ_e /q_m+1/K_Lq_m	47.824	0.000 6	0.961 1
Freundlich方程	参数
Freundlich方程	K_F /（mg·g^-1）	1/n	R²
ln q_e=ln K_F+ln ρ_e/n	0.095 2	0.746 7	0.985 2

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