scholarly journals Novel Polymer Material for Efficiently Removing Methylene Blue, Cu(II) and Emulsified Oil Droplets from Water Simultaneously

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1393 ◽  
Author(s):  
Jie Cao ◽  
Jianbei Zhang ◽  
Yuejun Zhu ◽  
Shanshan Wang ◽  
Xiujun Wang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Separation Efficiency ◽  
Crosslinking Agent ◽  
Cost Effective ◽  
Preparation Process ◽  
Water Emulsion ◽  
Practical Applications ◽  
Oil In Water ◽  
Oil In Water Emulsion ◽  
Oil Fouling

The pollution of water resources has become a worldwide concern. The primary pollutants including insoluble oil, toxic dyes, and heavy metal ions. Herein, we report a polymer adsorbent, named SPCT, to remove the above three contaminants from water simultaneously. The preparation process of SPCT contains two steps. Firstly, a hydrogel composed of sulfonated phenolic resin (SMP) and polyethyleneimine (PEI) was synthesized using glutaraldehyde (GA) as the crosslinking agent, and the product was named SPG. Then SPCT was prepared by the reaction between SPG and citric acid (CA) at 170 ∘ C. SPCT exhibited an excellent performance for the removal of methylene blue (MB) and Cu(II) from aqueous solution. For a solution with a pollutant concentration of 50 mg L−1, a removal efficiency of above 90% could be obtained with a SPCT dosage of 0.2 g L−1 for MB, or a SPCT dosage of 0.5 g L−1 for Cu(II), respectively. SPCT also presented an interesting wettability. In air, it was both superhydrophilic and superoleophilic, and it was superoleophobic underwater. Therefore, SPCT could successfully separate oil-in-water emulsion with high separation efficiency and resistance to oil fouling. Additionally, SPCT was easily regenerated by using dilute HCl solution as an eluent. The outstanding performance of SPCT and the efficient, cost-effective preparation process highlight its potential for practical applications.

Antifouling enhancement of polyacrylonitrile-based membrane grafted with poly(sulfobetaine methacrylate) layers

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jianlong Hu ◽  
Xuanren Zhu ◽  
Deqiong Xie ◽  
Xianya Peng ◽  
Meng Zhu ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Separation Efficiency ◽  
Membrane Surface ◽  
Surface Grafting ◽  
Water Emulsion ◽  
Oil In Water ◽  
Oil Adsorption ◽  
Grafting Copolymerization ◽  
Oil In Water Emulsion ◽  
Oil Fouling

Abstract In this work, zwitterionic polyacrylonitrile (PAN)-based membranes were synthesized via surface grafting strategy for improving the antifouling properties. The copolymer membrane consisting of PAN and poly(hydroxyethyl methacrylate) segments, was cast via nonsolvent induced phase separation, and then treated with acryloyl chloride to tether with carbon-carbon double bonds. Zwitterionic poly(sulfobetaine methacrylate) (PSBMA) layers were grafted onto membrane surface via concerted reactions of radical grafting copolymerization and quaternization with 2-(dimethylamino)ethyl methacrylate) and 1, 3-propanesultone (1, 3-PS) as the monomers. The grafting degree (GD) of PSBMA layers increases with the incremental content of monomers, leading to the enhancement in membranes surface hydrophilicity. The permeation experiments show that the flux of the zwitterionic membrane increases and then decreases with the increasing GD value, because of the surface coverage of PSBMA layers. The zwitterionic membrane has excellent separation efficiency for oil-in-water emulsion, with the rejection of a higher value than 99%. The irreversible membrane fouling caused by oil adsorption has been suppressed, as proved by the cycle-filtration tests. These outcomes confirm that oil-fouling resistances of membranes are improved obviously by the surface grafting of zwitterionic PSBMA layers.

scholarly journals In-situ self-dissolving and regenerating synthesis of superwetting cotton fabric with excellent oil/water emulsions separation performance

2021 ◽  
Author(s):  
Sudong Yang ◽  
Lin Chen ◽  
Shanshan Wang ◽  
Shuai Liu
Keyword(s):  
Cotton Fabric ◽  
Separation Efficiency ◽  
Separation Performance ◽  
Hydrophilic Surface ◽  
Water Emulsion ◽  
Oil In Water ◽  
Underwater Superoleophobicity ◽  
Oil In Water Emulsion ◽  
Fabric Surface

Abstract The textiles with superhydrophilicity and underwater superoleophobicity have shown excellent separation performance for emulsified oil in wastewater, but they still suffer from complicated construct of hierarchical architectures and hydrophilic surface. Herein, a hydrophilic hierarchical layer of cellulose is constructed on commercial cotton fabric surface via a proposed in-situ self-dissolving and regenerating strategy. The cellulose provides both hydrophilic surface and hierarchical structural foundation for the remodeled cotton fabric (RCF) without any further chemical modification. The obtained RCF has strong superhydrophilicity, underwater superoleophobicity, and anti-oil-adhesion property, which can be applicable for efficient oil-in-water emulsion separation with high separation efficiency and recyclable antifouling performance. The developed RCF assembly strategy provides an excellent membrane for the separation of oil-in-water emulsion, and a new prospect for the convenient and universal construct of other superwetting cellulose-based materials.

scholarly journals Superhydrophilic fluorinated polyarylate membranes via in situ photocopolymerization and microphase separation for efficient separation of oil-in-water emulsion

RSC Advances ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 958-962 ◽  
Author(s):  
Hui Li ◽  
Cuiping Zhou ◽  
Chunsheng Li ◽  
Xiaohui Li ◽  
Shuxiang Zhang
Keyword(s):  
Tensile Strength ◽  
Separation Efficiency ◽  
Microphase Separation ◽  
High Tensile Strength ◽  
Water Emulsion ◽  
Efficient Separation ◽  
Oil In Water ◽  
Oil In Water Emulsion ◽  
High Separation

We have developed a novel superhydrophilic FPAR membrane with high tensile strength by in situ photocopolymerization and microphase separation, which can effectively separate oil-in-water emulsions with high separation efficiency and flux.

Ultralight free-standing reduced graphene oxide membranes for oil-in-water emulsion separation

2015 ◽  
Vol 3 (40) ◽  
pp. 20113-20117 ◽  
Author(s):  
Na Liu ◽  
Miao Zhang ◽  
Weifeng Zhang ◽  
Yingze Cao ◽  
Yuning Chen ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Free Standing ◽  
Water Emulsion ◽  
Oil In Water ◽  
Reduced Graphene ◽  
Emulsion Separation ◽  
Oil In Water Emulsion ◽  
Oxide Membranes ◽  
High Separation ◽  
Graphene Oxide Membranes

Ultralight free-standing RGO membranes are capable of separating multiple types of surfactant stabilized oil-in-water emulsions with high separation efficiency.

scholarly journals Mussel-Inspired Fabrication of PDA@PAN Electrospun Nanofibrous Membrane for Oil-in-Water Emulsion Separation

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3434
Author(s):  
Haodong Zhao ◽  
Yali He ◽  
Zhihua Wang ◽  
Yanbao Zhao ◽  
Lei Sun
Keyword(s):  
Separation Efficiency ◽  
Low Cost ◽  
Nanofibrous Membrane ◽  
Water Separation ◽  
Water Emulsion ◽  
Oil In Water ◽  
Emulsion Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Oil In Water Emulsion

Emulsified oily wastewater threatens human health seriously, and traditional technologies are unable to separate emulsion containing small sized oil droplets. Currently, oil–water emulsions are usually separated by special wettability membranes, and researchers are devoted to developing membranes with excellent antifouling performance and high permeability. Herein, a novel, simple and low-cost method has been proposed for the separation of emulsion containing surfactants. Polyacrylonitrile (PAN) nanofibers were prepared via electrospinning and then coated by polydopamine (PDA) by using self-polymerization reactions in aqueous solutions. The morphology, structure and oil-in-water emulsion separation properties of the as-prepared PDA@PAN nanofibrous membrane were tested. The results show that PDA@PAN nanofibrous membrane has superhydrophilicity and almost no adhesion to crude oil in water, which exhibits excellent oil–water separation ability. The permeability and separation efficiency of n-hexane/water emulsion are up to 1570 Lm−2 h−1 bar−1 and 96.1%, respectively. Furthermore, after 10 cycles of separation, the permeability and separation efficiency values do not decrease significantly, indicating its good recycling performance. This research develops a new method for preparing oil–water separation membrane, which can be used for efficient oil-in-water emulsion separation.

scholarly journals Rotating Cylinder Microfiltration of Oil–in–Water Emulsion Using Novel Slotted Pore Filter

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Putu Doddy Sutrisna ◽  
Richard G. Holdich ◽  
Serguei R. Kosvintsev ◽  
Iain W. Cumming
Keyword(s):  
Crude Oil ◽  
Oil Recovery ◽  
Separation Efficiency ◽  
Petroleum Industry ◽  
Cross Flow ◽  
Water Emulsion ◽  
Cross Flow Filtration ◽  
Oil In Water ◽  
Flow Filtration ◽  
Oil In Water Emulsion

Nowadays, oil–in–water emulsion has become an important topic in petroleum industry, which produces oil–inwater emulsion in the recovery of crude oil. Oil–in–water emulsion produced in crude oil recovery causes problems at different stages of the production in the petroleum industry. Recently, microfiltration has been applied in the separation of oil from water. In filtration of oil–in–water emulsion, there is the possibility of oil drops deforming and squeezing through the slot of membrane so the separation efficiency will decrease. This research has studied cross flow filtration of oil–in–water emulsion in a rotating system and also visualized the interaction of oil drops and slot shaped membrane pores. The drop or bubble–slot experiment used a slot with different width. It has been found that the squeezing of an oil drop in the slot is really determined by the pressure applied and velocity of the surrounding fluid. Cross flow microfiltration experiment was conducted using tubular slotted pore membrane with rotation to generate shear on the surface of membrane. Kerosene and crude oil were tested using 5.3 and 7.5 microns membrane at different rotation speed and permeate velocity. Experimental results indicated that in a no blocking condition, the movement of oil drops was determined by shear force and permeate drag force. While in blocking condition, the rejection of oil drops was determined by the formation and characteristic of the secondary membrane formed on the surface of membrane. Blocking will improve the filtration performance in relation to oil rejection, but it will increase the pressure needed or decrease the flux rate through the membrane.

Robust superhydrophobic attapulgite coated polyurethane sponge for efficient immiscible oil/water mixture and emulsion separation

2016 ◽  
Vol 4 (40) ◽  
pp. 15546-15553 ◽  
Author(s):  
Jian Li ◽  
Changcheng Xu ◽  
Yan Zhang ◽  
Rongfang Wang ◽  
Fei Zha ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Water Mixture ◽  
Water Emulsion ◽  
Oil In Water ◽  
Emulsion Separation ◽  
Polyurethane Sponge ◽  
Oil Water ◽  
Oil In Water Emulsion

The superhydrophobic PU sponges separated oils from immiscible oil/water mixture and oil-in-water emulsion with the separation efficiency over 99.8%.

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