天然蛇纹石处理含Sb(Ⅲ)废水影响因素及机理研究
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摘要
本文采用天然蛇纹石为吸附剂,以K(Sb O)C_4H_4O_6·1/2H_2O为Sb(Ⅲ)锑源,进行吸附试验。探讨了不同吸附时间、初始浓度、p H值、温度对吸附量的影响及解吸效果。利用傅里叶红外光谱仪、X-射线衍射仪对天然蛇纹石进行表征。结果表明:天然蛇纹石主要矿物是纤蛇纹石;Elovich模型能更好地反应吸附动力学过程,由Hill1模型可知理论最大吸附量为9.51 mg/g; Langmuir模型和Freundlich模型对等温吸附曲线拟合效果相同;初始p H值在1.9时吸附量最大,可达9.69 mg/g,初始p H值在3.6～8.0范围内吸附量变化幅度小,初始p H值为10.5时,吸附量略有增加;温度升高有利于吸附的进行;在365 min时的解吸量可达理论最大解吸量的82.6%,表明解吸效果好,有利于吸附剂的重复利用;蛇纹石表面活性基团OH-在其对Sb(Ⅲ)的吸附过程中起主要作用。Sb(Ⅲ)在蛇纹石表面主要形成内源表面络合。
Using natural serpentine as adsorbent and K(SbO)C_4H_4O_6·1/2 H_2O as Sb(Ⅲ) antimony source, the adsorption experiments were carried out. The effects of different adsorption time, initial concentration, pH and temperature on adsorption capacity and desorption effect were discussed.Natural serpentine was characterized by FTIR spectrum, X-ray diffraction.The results show that the main mineral of natural serpentine is chrysotile;Elovich model is more suitable for the kinetic process of reaction and adsorption. according to Hill1 model, the theoretical maximum adsorption capacity is 9.51 mg/g; Langmuir model and Freundlich model have the same fitting effect on isothermal adsorption curve; When the initial pH is 1.9,the adsorption capacity reaches 9.69 mg/g, and the initial pH value varies slightly in the range of 3.6-8.0, when the initial pH is 10.5, the adsorption amount increases slightly;The increase of temperature is beneficial to the adsorption process; At 365 min, the desorption amount can reach 82.6% of the theoretical maximum desorption fineness, which indicates that the desorption effect is good and is conducive to the reuse of adsorbents. The serpentine surface active group OH-plays a major role in its adsorption of Sb(Ⅲ). Sb(Ⅲ) mainly forms endogenous surface complexation on serpentine surface.
Using natural serpentine as adsorbent and K(SbO)C_4H_4O_6·1/2 H_2O as Sb(Ⅲ) antimony source, the adsorption experiments were carried out. The effects of different adsorption time, initial concentration, pH and temperature on adsorption capacity and desorption effect were discussed.Natural serpentine was characterized by FTIR spectrum, X-ray diffraction.The results show that the main mineral of natural serpentine is chrysotile;Elovich model is more suitable for the kinetic process of reaction and adsorption. according to Hill1 model, the theoretical maximum adsorption capacity is 9.51 mg/g; Langmuir model and Freundlich model have the same fitting effect on isothermal adsorption curve; When the initial pH is 1.9,the adsorption capacity reaches 9.69 mg/g, and the initial pH value varies slightly in the range of 3.6-8.0, when the initial pH is 10.5, the adsorption amount increases slightly;The increase of temperature is beneficial to the adsorption process; At 365 min, the desorption amount can reach 82.6% of the theoretical maximum desorption fineness, which indicates that the desorption effect is good and is conducive to the reuse of adsorbents. The serpentine surface active group OH-plays a major role in its adsorption of Sb(Ⅲ). Sb(Ⅲ) mainly forms endogenous surface complexation on serpentine surface.
引文
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[2]孟君,任向莉.锑的形态分析概述[J].光谱试验室,2010,27(5):1742-1748.
[3]李志萍,杨晶晶,孙程奇,等.水中锑污染处理方法的研究进展[J].工业水处理,2018,38(6):12-16,26.
[4]HUANG P,LI Z,CHEN M,et al.Mechanochemical activation of serpentine for recovering Cu(II)from wastewater[J].Applied Clay Science,2017,149:1-7.
[5]李喜林,尚方方,陈冬琴,等.蛇纹石吸附含氟地下水试验研究[J].非金属矿,2017,40(3):86-88.
[6]彭文世.矿物红外光谱图集[M].北京:科学出版社,1982.
[7]杨艳霞,冯其明,刘琨,等.纤蛇纹石在盐酸浸出过程中结构变化的研究[J].中国矿业大学学报,2007(4):559-564.
[8]WANG L J,LU A H,WANG C Q,et al.Nano-fibriform production of silica fr om natural chry sotile[J].Journal of Colloid and Interface Science,2006,295:436-439.
[9]徐伟,刘锐平,曲久辉,等.铁锰复合氧化物吸附去除五价锑性能研究[J].环境科学学报,2012,32(2):270-275.
[10]杨慧,宁海丽,裴亮.凹凸棒土的氨氮吸附性能研究[J].环境工程学报,2011,5(2):343-346.
[11]李桂金,赵平,白志民.蛇纹石表面特性[J].硅酸盐学报,2017,45(8):1204-1210.
[12]李学军,王丽娟,鲁安怀,等.天然蛇纹石活性机理初探[J].岩石矿物学杂志,2003(4):386-390.
[13]DAI C,ZHOU Z,ZHOU X,et al.Removal of Sb(III)and Sb(V)from Aqueous Solutions Using nZVI[J].Water Air&Soil Pollution,2014,225(1):1799.
[14]FENG B,LU Y P,FENG Q M,et al.Mechanisms of surface charge development of serpentine mineral[J].Transactions of Nonferrous Metals Society of China,2013,23(4):1123-1128.
[15]曾嵘.锰改性石英砂(MOCS)去除原水中三价锑的研究[D].昆明:昆明理工大学,2013.
[16]LENG Y,GUO W,SU S,et al.Removal of antimony(III)from aqueous solution by graphene as an adsorbent[J].The Chemical Engineering Journal,2012,211/212:406-411.
[17]GOLDBERG S.Inconsistency in the triple layer model description of ionic strength dependent boron adsorption[J].Colloid Interf Sci,2005,285(2):509-517.
[18]KHALID N,AHMAD S,TOHEED A,et al.Potential of rice husks for antimony removal[J].Applied Radiation&Isotopes,2000,52(1):31-38.
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