一个混合系统用于从合成废水中去除离子,使用吸附辅助电凝的电凝
Jean Claude Nizeyimana1,2,3, Pamphile Ndagijimana4, Junaid Khan1
1School of Environment Northeast, Normal University, Changchun, 130117, China.
Environmental science and pollution research international
|March 28, 2024
概括
这项研究结合了吸附和电凝 (ADS+EC) 使用向日种子生物炭 (SSSB) 来有效地从水中去除离子 (Ni2+). 协同方法实现了99.98%的去除,为重金属污染提供了具有成本效益的解决方案.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 重金属离子,特别是 (Ni2+) 的污染对环境和健康构成重大风险.
- 现有的水处理方法经常面临效率,成本或完全去除高金属度的挑战.
- 开发可持续和低成本的吸附剂对于有效的重金属整治至关重要.
研究的目的:
- 为了研究吸附和电凝 (ADS+EC) 对于高度离子去除的联合疗效.
- 在ADS+EC工艺中利用具有成本效益的向日种子生物炭 (SSSB) 作为吸附剂.
- 描述SSSB并优化ADS+EC参数,以获得最大的去除效率.
主要方法:
- 太阳花种子贝生物炭 (SSSB) 通过使用SEM,FT-IR,XRD,N2吸附-溶解,XPS和TEM等技术进行了合成和表征.
- 进行了批量吸附和电凝试验,优化了pH,吸附剂剂量,初始度,电极类型 () 和电流密度等参数.
- 应用了动力和异热模型 (伪二次和朗穆尔) 来了解Ni2+吸附和电凝机制.
主要成果:
- 合并的ADS+EC技术显著优于单个方法,达到99.98%的最大离子去除效率.
- 优化条件包括pH值6.0 (ADS) 和4.0 (ADS/EC),SSSB剂量1.5g/L,以及特定的电流密度.
- 确定SSSSB的最大吸附能力为44.247mg/g,吸附动力学遵循伪二阶模型,平衡数据符合兰格穆尔等温度.
结论:
- 使用SSSB的协同ADS+EC方法是一种高效和成本效益的方法,用于从水溶液中去除高度的离子.
- 作为废水处理的可持续吸附剂,SSSSB显示出出色的潜力.
- 这项研究强调了一项有前途的技术,用于解决各种水源中的重金属污染问题.
相关概念视频
Coagulation
292
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
292
Electrodeposition
633
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
633
Precipitation Gravimetry
6.3K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
6.3K
Colloidal precipitates
576
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...
576
Precipitation and Co-precipitation
1.8K
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...
1.8K
Ion Exchange
591
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
591


