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首页> 外文期刊>RSC Advances >Performance of a zeolite modified with N,N-dimethyl dehydroabietylamine oxide (DAAO) for adsorption of humic acid assessed in batch and fixed bed columns
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Performance of a zeolite modified with N,N-dimethyl dehydroabietylamine oxide (DAAO) for adsorption of humic acid assessed in batch and fixed bed columns

机译：在分批和固定床色谱柱中评估了用N，N-二甲基脱氢松香胺氧化物（DAAO）改性的沸石对腐殖酸的吸附性能

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摘要

Factors that affect adsorption of a synthetic humic acid (HA) on a zeolite modified with the surfactant N , N -dimethyl dehydroabietylamine oxide (DAAO) (SMZ) were investigated in batch and fixed bed column experiments. Adsorption increased with increasing HA concentrations and contact time, but decreased with increasing pH, temperature, and ionic strength. Adsorption of HA on SMZ was increased by the presence of the cations Ca ~(2+) and Mg ~(2+) , whereas anions such as NO _(3) ~(?) , HCO _(3) ~(?) , SO _(4) ~(2?) , and PO _(4) ~(3?) showed the opposite trend, and competed with HA adsorption. HA adsorption on SMZ was well-fitted by pseudo-second order kinetics, and described by the Langmuir isotherm model. The maximum adsorption capacity in batch experiments calculated from the Langmuir adsorption isotherm was about 126 mg g ~(?1) . Thermodynamic calculations showed that HA adsorption on the zeolite with bilayer DAAO coverage was spontaneous and exothermic. Optimum desorption was obtained using 0.1 M NaOH with a recovery of 94%. The HA adsorption capacity of SMZ at the breakthrough point was greatly influenced by bed depth, and could be described by the Thomas model. Adsorption mechanisms are interpreted as involving mainly hydrogen bonding and electrostatic interactions.
机译：在分批和固定床柱实验中，研究了影响合成腐殖酸（HA）在表面活性剂N，N-二甲基脱氢松香胺氧化物（DAAO）（SMZ）改性的沸石上吸附的因素。吸附随着HA浓度和接触时间的增加而增加，但随着pH值，温度和离子强度的增加而降低。阳离子Ca〜（2+）和Mg〜（2+）的存在增加了HA在SMZ上的吸附，而阴离子如NO _（3）〜（？），HCO _（3）〜（？） SO _（4）〜（2？）和PO _（4）〜（3？）呈现相反的趋势，并与HA吸附竞争。 HA在SMZ上的吸附通过拟二级动力学很好地拟合，并由Langmuir等温模型描述。由Langmuir吸附等温线计算的分批实验中的最大吸附容量为约126mg g〜（Δ1）。热力学计算表明，HA在双层DAAO覆盖的沸石上的吸附是自发的且放热的。使用0.1 M NaOH可获得最佳的脱附率，回收率为94％。 SMZ在突破点的HA吸附能力受床深的影响很大，可以用Thomas模型描述。吸附机理被解释为主要涉及氢键和静电相互作用。

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