Core-Shell Structured Carbon@Al₂O₃ Membrane with Enhanced Acid Resistance for Acid Solution Treatment

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Ceramic membranes are crucial for industrial acid solution treatment.
• Improving acid resistance is key to optimizing ceramic membrane performance.
• Existing membranes often lack sufficient durability in harsh acidic environments.

Purpose of the Study:

• To develop an acid-resistant ceramic membrane with enhanced durability.
• To investigate the effect of a carbon layer on ceramic membrane acid resistance.
• To evaluate the performance of the modified membrane in treating various acid solutions.

Main Methods:

• Fabrication of a core-shell structured membrane on alumina substrates using a one-step in situ hydrothermal method.
• Coating the ceramic membrane with a chemically stable carbon layer.
• Testing membrane mass loss in hydrochloric and acetic acid solutions.
• Analyzing acid adsorption using kinetic (pseudo-second-order) and isotherm (Langmuir) models.

Main Results:

• The carbon-modified membrane exhibited significantly improved acid resistance, with mass loss reduced by 90.91% in HCl and 76.92% in acetic acid.
• Adsorption studies indicated pseudo-second-order kinetics and Langmuir model behavior for the modified membrane.
• The modified membrane demonstrated faster acid adsorption speed and lower adsorption capacity compared to the pristine membrane.
• The membrane maintained good performance across various acid solutions and showed recyclability without significant flux decay.

Conclusions:

• The core-shell structured, carbon-coated ceramic membrane offers superior acid resistance.
• This facile modification strategy provides an efficient method for fabricating robust membranes for extreme conditions.
• The developed membrane technology holds promise for advanced industrial acid solution treatment applications.