聚合氯化铝铁和粘土应急去除蓝藻的室外模拟研究

文章在开展PAFC去除淡水中的铜绿微囊藻影响因素的室内模拟研究基础上进行PAFC和粘土应急去除巢湖水中蓝藻的室外模拟研究。结果表明,在20 mg/L的絮凝剂用量下,聚合氯化铝铁(PAFC)对巢湖水中蓝藻的沉降去除效果优于聚合氯化铝,达到97.7%。PAFC,PAFC和粘土(高岭石或海泡石)可以快速高效絮凝沉降巢湖水中的蓝藻,并且在30 d之内除藻率稳定地维持90.0%以上。同时探讨其对藻毒素释放抑制的影响,结果表明,加入PAFC和粘土(海泡石或高岭石)1 d后能有效地吸附水中的藻毒素,PAFC和海泡石组的吸附去除率大于PAFC和高岭石,且30 d内仍一直维持藻毒素浓度低于对照组。     

山东西部煤田石炭系高岭石夹矸的成分性质特征及除铁研究

本文分析了山东西部煤田石炭系高岭石夹矸的成分性质，并对其进行了除铁漂白试验研究，得出了山东西部煤炭田石炭系高岭石夹矸是一种优质高岭石矿物原料的结论。     

煤系高岭土及其快速悬浮煅烧工艺

我国煤系高岭石含量通常在95％以上，几乎不含长石和石英，但含有少量碳和有机质，此外还含少量铁和钛矿物杂质。煤系高岭土颜色为灰黑色，因而都需经过物理和化学除杂处理，调整化学组成，使其物化性质达到相应工业原料的国家标准。     

草酸促进双酚A在黏土矿物悬浮液中光降解研究

选择两种常见的天然黏土矿物高岭石和蒙脱石,研究了有机污染物双酚A(BPA)在其表面的吸附及草酸对黏土矿物悬浮液中BPA光降解的影响.结果表明,BPA在两种黏土矿物表面的吸附量较小,吸附符合Langmuir等温式.在250W金属卤化物灯(λ≥360nm)照射下,草酸可显著促进BPA在高岭石和蒙脱石悬浮液中的光降解,降解动力学符合Langmuir-Hinshelwood方程. 降解速率受pH值的影响较大,pH=4.0时速度最快,光降解速率同时受草酸浓度的影响.最后,通过分析矿物中铁的化学环境及反应过程中铁浓度变化,分析了草酸促进BPA在黏土矿物悬浮液中光降解的可能机制.     

Adsorption characterizations of fulvic acid fractions onto kaolinite

Fulvic acids extracted from a typical rice-production region near Taihu Lake of China were fractionated into three fractions including F4. 8, F7. 0 and F11. 0(eluted by pH4. 8 buffer, pH 7. 0bufferandpH 11. 0buffer, respectively). Sorption of fulvic acid(FA)fractions onto kaolinite was studied by batch adsorption experiments, and characterizations of kaolinite before and after adsorption were investigated using scanning electron microscopy(SEM). Adsorption isotherms of kaolinite for three FA fractions fit well with the Langmuir adsorption model. The adsorption density of the three fractions was positively correlated with the ratio of the amount of the alkyl carbon to that of carboxyl and carbonyl carbon in FA fractions and followed an order of F11. 0>F7. 0>F4.8.Hydrophobic interaction Was one of the control mechanisms for the sorption of FA fraction onto kaolinite. SEM images confirmed that compared to blank kaolinite samples, kaolinite samples coated by a FA fraction displayed an opener and more dispersed conformation resulting from the disruption of the floe structure in complex. Dispersion of kaolinite after adsorption was due to the repulsion between negatively charged FA. coated particles, which is closely related to the amount of FA fractions absorbed on kaolinite.