目录
摘要Ⅱ
关键词Ⅱ
AbstractⅢ
引言
引言1
1 材料与方法4
实验原理与仪器4
1.1.1 化学试剂4
1.1.2 实验仪器4
1.2 制备材料 4
1.2.1 Co3O4La2O3@RSBC的制备4
1.3 溶液配制 5
1.3.1 对氨基苯胂酸储备液5
1.3.2 过硫酸氢钾(PMS)储备液5
1.3.3 显色剂溶液5
1.4 实验操作 5
1.5 测定方法 5
1.5.1 测定无机砷5
1.5.2 测定pASA6
2 结果与分析6
2.1 不同体系中对pASA的去除6
2.2 PMS用量对对pASA的氧化影响7
2.3 初始pH值对pASA的氧化与产生的无机砷吸附去除影响8
2.4 竞争离子对pASA的氧化与产生的无机砷的吸附去除影响 9
2.5 自由基抑制剂对pASA的氧化影响 11
3 结论 12
致谢12
参考文献13
Co3O4La2O3@RSBC活化PMS同时氧化和吸附去除有机砷的研究
摘 要
对氨基苯胂酸(pASA)作为一种有机砷被当作畜牧促生长剂而广泛使用，其毒性较低且对环境危害有限。然而，一旦进入水环境和土壤中通过一系列复杂的生物转化，pASA将转变为更毒的无机砷而造成了较为严重的砷污染。本研究制备了新型复合材料Co3O4La2O3@RSBC作为催化剂，催化PMS使有机砷被氧化成无机五价砷，同时作为吸附剂吸附去除无机砷。通过实验研究了不同体系，PMS用量、共存离以及pH值对Co3O4La2O3@RSBC氧化吸附有机砷的影响效果。另外，通过加入自由基抑制剂的方法确定了反应历程中的自由基类型。实验结果表明：Co3O4La2O3@RSBC可以有效的活化PMS并且能够高效的氧化吸附去除水体中的有机砷和产生的无机砷,去除速率受PMS用量、pH值和竞争离子的影响；在实验所选PMS用量范围内，增加PM *51今日免费论文网|www.51jrft.com +Q: &351916072& 
S用量可以增大有机砷的去除速率但达到一个极大值后基本保持不变；在实验所选pH值范围内，酸性条件下有机砷的去除速率最大，酸性越强，去除速率越大；常见的共存离子中Cl—对有机砷的去除效果无明显影响，但腐殖酸(HA)和HCO3—对有机砷的去除效果有不同程度的影响；通过自由基抑制实验，可推测Co3O4La2O3@RSBC能催化PMS产生单线态氧(1O2)和硫酸根自由基(SO4(()而不是羟基自由基(•OH)氧化吸附去除了有机砷。该研究为治理含砷的污水提供重要的科学依据和理论基础。
Simultaneous oxidation and absorption of paminophenylarsonic acid by Co3O4La2O3@RSBC and PMS
ABSTRACT
As a kind of of organic arsenic, paminophenylarsonic acid (pASA) is widely used in animal husbandry as animals growth promotor. pASA is low toxic and and has weak impact on the environment. However, excreted into the environment, it will be transformed into highly toxic inorganic arsenic through a series of complex biological metabolism, which has caused serious arsenic contamination problems in the water environment. In this paper, a new Co3O4La2O3@RSBC composite was synthesized to catalyze peroxymonosulfate (PMS) for oxidizing organic arsenic into arsenic and adsorbing inorganic arsenic. The effects on removal of pASA were investigated, including different material system, PMS concentration, initial solution pH and competing ions. In addition, radical scavengers were applied in the reaction system to determine reactive oxygen species responsible for the efficient removal of pASA. The results indicated that Co3O4La2O3@RSBC could efficiently catalyze PMS to oxide pASA and adsorb inorganic arsenic and the removal rate was determined by PMS concentration, initial solution pH and competing ions. The removal rate gradually increased with an increase of concentrations of PMS, but it could not be further improved when PMS concentration was up to maximum value. The removal rate gradually increased with pH decreasing. The presence of Cl had no effect on the removal of pASA, but HA and HCO3 had significant effects on that. The radical scavengers experiment showed that Co3O4La2O3@RSBC could efficiently activate PMS for formation of single oxygen(1O2) and sulfate radicals (SO4(() rather than hydroxyl radicals (•OH) to remove pASA. Based on the results, it is a promising approach to remove pASA pollution in aqueous solution via a combination of Co3O4La2O3@RSBC with peroxymonosulfate.

原文链接：http://www.jxszl.com/hxycl/yyhx/607075.html