Development of titanium dioxide- MXene composites for removal of antibiotic in water

Name: Siwanat Sukidpaneenid

keyword: MXene

; TiO2-Ti3C2 composites

; Adsorption

; Photocatalytic activity

; Enrofloxacin

Abstract: MXenes are new family of two-dimensional (2D) transition metal carbide or nitrides. In recent years, MXenes have attracted tremendous attention and emerged as a new 2D material for exploration of various applications including energy storage and catalysis due to their unique properties such as good electrical conductivity, hydrophilicity, and ion intercalability. However, a few studies exist concerning environmental remediation. Therefore, this work aimed to develop TiO2-Ti3C2 composites for removal of enrofloxacin in water as well as characterized MXene and TiO2-Ti3C2 composites. The TiO2-Ti3C2 composites were successfully synthesized via calcination and microwave solvothermal methods. MXene (Ti3C2) was synthesized from the MAX phase (Ti3AlC2) by using HCl-LiF as an etchant and after that, MXene was applied as a precursor of TiO2 particles. The results showed that after modification of MXene with calcination and microwave solvothermal methods, the Al element was unnoticeable. To investigate the photocatalytic activity of photocatalyst, methylene blue (MB) was employed as a model pollutant. The NaOH-treated MXene cannot used as a photocatalyst in this experiment due to its good adsorption, leading it was difficult to observe the photocatalytic activity at high concentration of MB. However, the adsorption capacity of NaOH-treated MXene was up to 97.88 mg/g. Next, the TiO2-Ti3C2 composites (TiO2-MX) which synthesized by microwave solvothermal method exhibited the photocatalytic activity and adsorption ability greater than calcined MXene. For the degradation of enrofloxacin in water, the order of photocatalytic activity was found to be TiO2-MX@225C/NaCl > TiO2-MX@200C/NaCl > TiO2-MX@200C > TiO2-MX@175C/NaCl > TiO2-MX@175C > TiO2-MX@150C/NaCl whereas the order of adsorption ability was observed to be MXene (etching 1 time) > TiO2-MX@175C/NaCl > TiO2-MX@200C/NaCl > TiO2-MX@225C/NaCl > TiO2-MX@150C/NaCl > TiO2-MX@175C > TiO2-MX@200C. The photocatalytic activity was improved when TiO2-Ti3C2 composites were synthesized by microwave solvothermal in the presence of NaCl. Moreover, when the reaction temperature for synthesis of TiO2-Ti3C2 composites increased, the photocatalytic activity for removal of enrofloxacin was enhanced. In case of adsorption, the TiO2-Ti3C2 with NaCl could adsorb enrofloxacin better than TiO2-Ti3C2 without NaCl since Na which had positively charged exchange ion with enrofloxacin and the TiO2-MX without NaCl has lost their adsorption ability due to the high amount of TiO2 particles were formed on MXene. Nevertheless, the original MXene could adsorb enrofloxacin greater than TiO2-Ti3C2 composites because the positive charge of enrofloxacin was adsorbed by negative charge of MXene while TiO2-Ti3C2 composites composed of TiO2 particles. Consequently, the repulsion force between TiO2 particles and MB solution was observed

Thammasat University. Thammasat University Library

Address: BANGKOK

Email: preserv@tu.ac.th

Name: Paiboon Sreearunothai

Role: advisor

Name: Chamorn Chawengkijwanich

Role: co-advisor

Created: 2020

Modified: 2022-11-07

Issued: 2022-11-07

วิทยานิพนธ์/Thesis

application/pdf

DOI: 10.14457/TU.the.2020.84

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Engineering Technology

Grantor: Thammasat University

©copyrights Thammasat University

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	9299siwanat.pdf	6.88 MB

ใช้เวลา

0.029799 วินาที