Magnetic field assisted arrangement of photocatalytic TiO2 particles on membrane surface to enhance membrane antifouling performance for water treatment

Produced water is a wastewater generated from petroleum industry with high concentration of pollutants such as Total Dissolved Solid, Organic content, and Oil and grease. Membrane technology has been currently applied for produced water treatment due to its efficiency, compact, mild and clean process. The main problem of produced water using membrane is fouling on the membrane surface which causes on low permeate productivity. This paper is majority focused on the improvement of anti-fouling performance through several modifications to increase CA membrane hydrophilicity. The membrane was prepared by formulating the dope solution consists of 18 wt-% CA polymer, acetone, and PEG additive (3 wt-%, 5 wt-%, and 7 wt-%). The membranes are casted using NIPS method and being irradiated under UV light exposure. The SEM images show that parepared membrane has asymmetric structure consist of dense layer, intermediete layer, and finger-like support layer. The filtration test shows that PEG addition increase the membrane hydrophilicity and the permeate flux increases. UV light exposure on the membrane improves the membrane stability and hydrophilicity. The imrpovement of membrane anti-fouling performance is essential to achieve the higher productivity without lowering its pollutants rejection.

Download Full-text

Performance of Photocatalytic Microfiltration with Hollow Fiber Membrane

Materials Science Forum ◽

10.4028/www.scientific.net/msf.544-545.95 ◽

2007 ◽

Vol 544-545 ◽

pp. 95-98 ◽

Cited By ~ 8

Author(s):

Jong Tae Jung ◽

Jong Oh Kim ◽

Won Youl Choi

Keyword(s):

Heavy Metals ◽

Humic Acid ◽

Rate Constant ◽

Hollow Fiber ◽

Reaction Rate ◽

Hollow Fiber Membrane ◽

Membrane Surface ◽

Reaction Rate Constant ◽

Operational Parameters ◽

Tio2 Particles

The purpose of this study is to investigate the effect of the operational parameters of the UV intensity and TiO2 dosage for the removal of humic acid and heavy metals. It also evaluated the applicability of hollow fiber microfiltration for the separation of TiO2 particles in photocatalytic microfiltration systems. TiO2 powder P-25 Degussa and hollow fiber microfiltration with a 0.4 μm nominal pore size were used for experiments. Under the conditions of pH 7 and a TiO2 dosage 0.3 g/L, the reaction rate constant (k) for humic acid and heavy metals increased with an increase of the UV intensity in each process. For the UV/TiO2/MF process, the reaction rate constant (k) for humic acid and Cu, with the exception of Cr in a low range of UV intensity, was higher compared to that of UV/TiO2 due to the adsorption of the membrane surface. The reaction rate constant (k) increased as the TiO2 dosage increased in the range of 0.1~0.3 g/L. However it decreased for a concentration over 0.3 g/L of TiO2. For the UV/TiO2/MF process, TiO2 particles could be effectively separated from treated water via membrane rejection. The average removal efficiency for humic acid and heavy metals during the operational time was over 90 %. Therefore, photocatalysis with a membrane is believed to be a viable process for humic acid and heavy metals removal.

Download Full-text

Magnetic field assisted growth of highly dense α-Fe2O3 single crystal nanosheets and their application in water treatment

RSC Advances ◽

10.1039/c3ra47726f ◽

2014 ◽

Vol 4 (36) ◽

pp. 18621-18626 ◽

Cited By ~ 13

Author(s):

Dong Lin ◽

Biwei Deng ◽

Stephen A. Sassman ◽

Yaowu Hu ◽

Sergey Suslov ◽

...

Keyword(s):

Magnetic Field ◽

Energy Storage ◽

Water Treatment ◽

Single Crystal ◽

High Surface

Highly dense 2D nanostructures are desirable in photocatalysis, water treatment and energy storage, due to their high surface to volume areas.

Download Full-text

Study on Photodynamic Therapy for HL60 Cells Inactivation by Visible Light-Induced Fe-Doped Nano-TiO2 under Magnetic Field

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.152-153.136 ◽

2010 ◽

Vol 152-153 ◽

pp. 136-143

Author(s):

Yu Ying Xiong ◽

Cui Fen Liang ◽

Hua Xiao ◽

Jian Wen Xiong

Keyword(s):

Magnetic Field ◽

Optical Properties ◽

Photodynamic Therapy ◽

Leukemic Cells ◽

Precipitation Method ◽

Doping Content ◽

Fe Doping ◽

Nano Tio2 ◽

Doped Tio2 ◽

Tio2 Particles

Fe-doped TiO2 was prepared by a homogenous precipitation method and characterized by XRD, UV-Vis DRS. The structure and the optical properties of nano-TiO2 with different Fe doping content were studied, as well as the effect and the possible mechanics of different intensity of TiO2 particles, Fe-doped nano-TiO2 particles on the activity of HL60 leukemic cells. The influence on the activity of cells exposures in light compared with un-exposure also be analysed. As the photo sensitizers, TiO2 and Fe-doped TiO2 particles eliminated tumor cell using photodynamic therapy(PDT)under magnetic field.

Download Full-text

Atomic layer deposition and electrospinning as membrane surface engineering methods for water treatment: a short review

Environmental Science Water Research & Technology ◽

10.1039/c9ew01134j ◽

2020 ◽

Vol 6 (7) ◽

pp. 1765-1785

Author(s):

Jieun Lee ◽

In S. Kim ◽

Moon-Hyun Hwang ◽

Kyu-Jung Chae

Keyword(s):

Water Treatment ◽

Atomic Layer Deposition ◽

Surface Engineering ◽

Membrane Surface ◽

Atomic Layer ◽

Short Review ◽

Review Article ◽

Future Perspectives ◽

Layer Deposition ◽

Insight Into

This review article provides a summary of the application of ALD and electrospinning in membrane processes for water treatment and insight into the technological challenges and future perspectives for their wider application in the membrane industry.

Download Full-text