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首页> 外文期刊>Journal of Applied Polymer Science >Ability of iron(III)-loaded carboxylated polyacrylamide-grafted sawdust to remove phosphate ions from aqueous solution and fertilizer industry wastewater: Adsorption kinetics and isotherm studies
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Ability of iron(III)-loaded carboxylated polyacrylamide-grafted sawdust to remove phosphate ions from aqueous solution and fertilizer industry wastewater: Adsorption kinetics and isotherm studies

机译：负载铁（III）的羧基化聚丙烯酰胺接枝木屑去除水溶液和化肥工业废水中的磷酸根离子的能力：吸附动力学和等温线研究

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Iron(III)-loaded carboxylated polyacrylamide-grafted sawdust was investigated as an adsorbent for the removal of phosphate from water and wastewater. The carboxylated polyacrylamide-grafted sawdust was prepared by graft copolymerization of acrylamide and N,N'-methylenebisacrylamide onto sawdust in the presence of an initiator, potassium peroxydisulfate. Iron(III) was strongly attached to the carboxylic acid moiety of the adsorbent. The adsorbent material exhibits a very high adsorption potential for phosphate ions. The coordinated unsaturated sites of the iron(III) complex of polymerized sawdust were considered to be the adsorption sites for phosphate ions, the predominating species being H2PO4- ions. Maximum removal of 97.6 and 90.3% with 2 g L-1 of the adsorbent was observed at pH 2.5 for an initial phosphate concentration of 100 and 250 mumol L-1, respectively. The adsorption process follows second-order kinetics. Adsorption rate constants as a function of concentration and temperature and kinetic parameters, such as DeltaG(+/-), DeltaH(+/-), and DeltaS(+/-), were calculated to predict the nature of adsorption. The L-type adsorption isotherm obtained in the sorbent indicated a favorable process and fitted the Langmuir equation model well. The adsorption capacity calculated by the Langmuir adsorption isotherm gave 3.03 X 10(-4) mol g(-1) of phosphate removal at 30degreesC and pH 2.5. The isosteric heat of adsorption was also determined at various surface loadings of the adsorbent. The adsorption efficiency toward phosphate removal was tested using industrial wastewater. Different reagents were tested for extracting phosphate ions from the spent adsorbent. About 98.2% of phosphate can be recovered from the adsorbent using 0.1M NaOH. Alkali regeneration was tried for several cycles with a view to recover the adsorbed phosphate and also to restore the adsorbent to its original state. (C) 2002 Wiley Periodicals, Inc. [References: 34]
机译：负载铁（III）的羧化聚丙烯酰胺接枝木屑被用作吸附剂，用于去除水和废水中的磷酸盐。通过在引发剂过氧二硫酸钾的存在下将丙烯酰胺和N，N'-亚甲基双丙烯酰胺接枝共聚到锯末上来制备羧化聚丙烯酰胺接枝的木屑。铁（III）牢固地附着在吸附剂的羧酸部分上。吸附材料对磷酸根离子具有很高的吸附潜力。聚合木屑的铁（III）配合物的配位不饱和位点被认为是磷酸根离子的吸附位点，其中主要的是H 2 PO 4-离子。在pH 2.5时，初始磷酸盐浓度分别为100和250μmolL-1时，使用2 g L-1的吸附剂可最大去除97.6％和90.3％。吸附过程遵循二级动力学。计算吸附速率常数与浓度，温度和动力学参数的关系，例如DeltaG（+/-），DeltaH（+/-）和DeltaS（+/-），以预测吸附的性质。在吸附剂中获得的L型吸附等温线显示出良好的过程，并很好地拟合了Langmuir方程模型。通过Langmuir吸附等温线计算的吸附容量在30°C和pH 2.5的条件下去除了3.03 X 10（-4）mol g（-1）的磷酸盐。还测定了吸附剂在各种表面负荷下的吸附等排热。使用工业废水测试了对磷酸盐去除的吸附效率。测试了不同的试剂以从用过的吸附剂中提取磷酸根离子。使用0.1M NaOH可以从吸附剂中回收约98.2％的磷酸盐。为了恢复吸附的磷酸盐并也将吸附剂恢复到其原始状态，尝试了碱再生几个循环。 （C）2002 Wiley Periodicals，Inc. [参考：34]

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