相关实验视频

Updated: Jun 11, 2025

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

Published on: August 23, 2012

太阳光驱动的直接/中介电子转移对Cr (VI) 进行了减少性封存,在溶解的黑色碳 - 铁化物共沉积物上

Leiye Sun¹, Tianming Wang¹, Bo Li¹

¹School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.

Environmental science & technology

|October 4, 2024

概括

阳光驱动 (VI) 降解在铁和溶解的黑碳共沉积物上. 溶解的黑碳增强了这一过程,这对于了解阳光照明环境中的污染至关重要.

科学领域:

环境化学环境化学
地质化学地质化学
摄影化学的使用.

背景情况:

表面流水分发 (Cr) 污染,影响生态系统.
阳光和光活性物质,如化 (Fh) 和溶解的黑碳 (DBC) 影响Cr.循环.
了解阳光照射环境中的Cr转化对于污染管理至关重要.

研究的目的:

研究DBC-Fh共沉积物上的Cr物种的阳光驱动的转化动力学.
阐明受太阳光和光活性材料影响的Cr(VI) 减少性封存的机制.
评估DBC含量在Cr (VI) 降低效率中的作用.

主要方法:

在合成的DBC-Fh共沉积物上研究了Cr物种的阳光驱动的转化.
分析了通过吸附,表面减少和水性减少途径去除Cr (VI).
研究了光电子,光生成的Fe (II) 物种和超氧化基 (·O2−) 在Cr (VI) 减少中的作用.

主要成果:

太阳光诱导的Cr(VI) 通过通过两个途径在DBC-Fh共沉物上通过还原性分离去除.
较高的DBC含量与更有效地减少吸附和水性Cr6相关.
来自DBC和光生成的Fe (II) 物种的光电子显著介导了Cr (VI) 减少,而O2−的贡献有限.

结论:

光电子和光生成的电子介质是DBC-Fh共沉积物上Cr (VI) 降解封存的关键驱动因素.
这项研究为在阳光影响下Cr污染的地球化学循环提供了新的见解.
在阳光照射的表面环境中,DBC充当电子捐赠者,增强Cr (VI) 减少.

关键词:

溶解的 pyrogenic 碳是什么电子转移是电子的转移.铁酸盐与铁酸盐共同沉.六价的六价是一种多步反应动力学多步反应动力学降低性分离法减少性分离法模拟的阳光模拟的阳光.

更多相关视频

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Published on: October 5, 2019

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

Published on: February 11, 2016

相关概念视频

Precipitation and Co-precipitation

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

Formation of Complex Ions

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

Types of Coprecipitation

Types of Coprecipitation

Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...