高铁硫化锌精矿的真空铁还原

开展了真空下铁还原高铁硫化锌精矿的热力学分析和试验研究。在整个还原过程中锌以单质形式冷凝回收,直收率达95%左右,矿物中的硫主要以FeS的形式固定。通过试验研究确定了真空下铁还原高铁硫化锌精矿较好的工艺条件。

高铁硫化锌精矿的真空铁还原

开展了真空下铁还原高铁硫化锌精矿的热力学分析和试验研究.在整个还原过程中锌以单质形式冷凝回收,直收率达95%左右,矿物中的硫主要以FeS的形式固定.通过试验研究确定了真空下铁还原高铁硫化锌精矿较好的工艺条件.

还原剂强化Fe(Ⅱ)活化过氧化物高级氧化体系研究进展

Fe^(2+)活化过氧化物高级氧化体系因其能够产生高活性氧化剂、分解难生物降解有机物、提高废水可生化性,在环境污染治理领域得到广泛关注。但该体系中Fe^(3+)/Fe^(2+)循环速率较慢,制约了目标污染物降解效能的提升。在实际工程中,常通过同步投加铁还原剂强化该高级氧化体系中Fe^(3+)的还原过程,进而提升活性氧化剂的生成效率。常用的铁还原剂主要分为无机还原剂和有机还原剂两大类。无机还原剂包括羟胺、亚硫酸盐、零价金属和碳材料等,有机还原剂包括酚醌类、抗坏血酸和巯基化合物等。还原剂在强化Fe^(3+)/Fe^(2+)循环过程的同时,还有可能竞争消耗过氧化物和淬灭活性氧化剂,且部分还原剂具有生物毒性,不利于规模化应用。总结了各类铁还原剂强化Fe^(2+)活化过氧化物高级氧化体系降解目标污染物的效果、基本机理以及各还原剂的优缺点,为进一步研究开发新型高效环境友好型铁还原剂提供了参考和指导。

Single-atom catalysts based on polarization switching of ferroelectric In_(2)Se_(3)for N2 reduction

The polarization switching plays a crucial role in controlling the final products in the catalytic pro-cess.The effect of polarization orientation on nitrogen reduction was investigated by anchoring transition metal atoms to form active centers on ferroelectric material In_(2)Se_(3).During the polariza-tion switching process,the difference in surface electrostatic potential leads to a redistribution of electronic states.This affects the interaction strength between the adsorbed small molecules and the catalyst substrate,thereby altering the reaction barrier.In addition,the surface states must be considered to prevent the adsorption of other small molecules(such as*O,*OH,and*H).Further-more,the V@↓-In_(2)Se_(3)possesses excellent catalytic properties,high electrochemical and thermody-namic stability,which facilitates the catalytic process.Machine learning also helps us further ex-plore the underlying mechanisms.The systematic investigation provides novel insights into the design and application of two-dimensional switchable ferroelectric catalysts for various chemical processes.