TiO_2/CTS/ATP吸附联合超滤工艺去除腐殖酸的研究
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摘要
以酸化凹土(ATP)作载体制备壳聚糖/凹土(CTS/ATP),再采用溶胶-凝胶法负载Ti O_2制得Ti O_2/CTS/ATP。研究表明,Ti O_2/CTS/ATP等电点(pH=6.28)比ATP等电点(pH=2.55)高,更易达到最佳pH条件;比表面积和孔隙体积相比ATP增大,吸附容量提高。在pH为3～10,Ti O_2/CTS/ATP投加量为1.0 g/L条件下,对水中腐殖酸具有较好的吸附效果。相比单独吸附和超滤,采用吸附联合超滤去除腐殖酸效果更佳。吸附联合超滤既能减轻超滤膜负荷,又可缓解膜污染。
Acidified pretreated attapulgite(ATP)was applied as carrier to obtain chitosan/attapulgite(CTS/ATP)composite,and then titania was loaded by sol-gel method to obtain titanium dioxide/chitosan/attapulgite(TiO_2/CTS/ATP)composite.The results showed that the isoelectric point of the composite of TiO_2/CTS/ATP(pH=6.28)was higher than that of ATP(pH=2.55),indicating that the composite was easier to control pH of optimum adsorption than ATP,and the corresponding specific surface area and the pore volume of the composite exhibited an increase trends,the adsorption capacity enhanced.The composite exhibited a good capacity for humic acid removal under the condition of pH of 3-10 and composite dosage of 1.0 g/L.Compared with adsorption and ultrafiltration alone,adsorption combined with ultrafiltration process was more effective in removing humic acid.Composite adsorption pretreatment could reduce the load of the ultrafiltration membrane and alleviate the fouling on membrane.
Acidified pretreated attapulgite(ATP)was applied as carrier to obtain chitosan/attapulgite(CTS/ATP)composite,and then titania was loaded by sol-gel method to obtain titanium dioxide/chitosan/attapulgite(TiO_2/CTS/ATP)composite.The results showed that the isoelectric point of the composite of TiO_2/CTS/ATP(pH=6.28)was higher than that of ATP(pH=2.55),indicating that the composite was easier to control pH of optimum adsorption than ATP,and the corresponding specific surface area and the pore volume of the composite exhibited an increase trends,the adsorption capacity enhanced.The composite exhibited a good capacity for humic acid removal under the condition of pH of 3-10 and composite dosage of 1.0 g/L.Compared with adsorption and ultrafiltration alone,adsorption combined with ultrafiltration process was more effective in removing humic acid.Composite adsorption pretreatment could reduce the load of the ultrafiltration membrane and alleviate the fouling on membrane.
引文
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[13]凌慧诗.改性凹土的制备及对微污染水源腐殖酸的去除研究[D].广州:广东工业大学,2015.
[2]梁宏斌,张玉宝,斯琴图雅,等.水中腐殖酸的去除方法[J].科技创新与应用,2013(27):286.
[3]Deng Yuehua,Gao Zhanqi,Liu Benzhi,et al. Selective removal of lead from aqueous solutions by ethylenediamine-modified attapulgite[J]. Chemical Engineering Journal,2013, 223:91-98.
[4]罗平,邹建国,刘燕燕.凹凸棒土在环境保护中的应用进展[J].江西科学,2010,28(4):466-469.
[5]赵娣芳,周杰,刘宁.凹凸棒石改性机理研究进展[J].硅酸盐通报,2005,24(3):67-69.
[6]任珺,陶玲,郭永春,等.凹凸棒石粘土的改性方法研究现状[J].中国非金属矿工业导刊,2012(5):28-31.
[7]李春全,艾伟东,孙志明,等. V-TiO2/凹凸棒石复合光催化材料的制备与研究[J].人工晶体学报,2016,45(3):655-660.
[8]Xie Aijuan,Luo Shiping,Chaoyao Y. Preparation of titanium dioxide/attapulgite composites and their application in treating Reactive Black KN-B wastewater[J]. Environment Protection Engineering,2014,40(1):45-56.
[9]胡盛,苏阳,田大听,等.壳聚糖/凹凸棒石纳米复合材料的制备与表征[J].化工新型材料,2013,41(12):149-151.
[10]Liang F,Deng Y,Liu B. Adsorption of humic acid from aqueous solution onto chitosan-coated attapulgite composites[J]. Desalination&Water Treatment,2017,81:216-222.
[11]李圭白,杨艳玲.第三代城市饮用水净化工艺——超滤为核心技术的组合工艺[J].给水排水,2007,33(4):1.
[12]Campinas M,Rosa M J. Assessing PAC contribution to the NOM fouling control in PAC/UF systems[J]. Water Research,2010,44(5):1636-1644.
[13]凌慧诗.改性凹土的制备及对微污染水源腐殖酸的去除研究[D].广州:广东工业大学,2015.