Advances in the use of porous materials for oilwater separation offer a promising avenue for solving oil spill problems.Conventionally,to realize selective oil absorption,porous sorbents need to be fully hydrophobized...Advances in the use of porous materials for oilwater separation offer a promising avenue for solving oil spill problems.Conventionally,to realize selective oil absorption,porous sorbents need to be fully hydrophobized with lowsurface-energy chemicals.However,such exhaustive hydrophobization brings about problems of excessive chemical consumption,high cost and increased environmental hazards,hindering the practical applications of sorbents.Here,an innovative type of oil sorbent is developed via a facile liquid film-based dip coating technique.Unlike conventional fullyhydrophobized sorbents,only the outmost layer of our sorbent is modified with hydrophobic polydimethylsiloxane(PDMS)coating while the inner part remains hydrophilic,thus achieving 80%reduction in low-surface-energy chemical consumption.The prepared sorbent allows highly selective oil absorption from oil-water mixture,as the hydrophobic skin layer blocks water entrance and the hydrophilic inner part drives oil absorption.More importantly,our sorbent significantly speeds up oil absorption,and compared with conventional hydrophobic sponges,the absorption time is reduced by 36%for absorption of the same mass of crude oil,attributed to the strong capillary absorption of its hydrophilic inner channels.This sorbent also shows larger specific absorption capacity than its fully hydrophobized counterpart.Our study provides a general strategy to develop cost-effective and environmental-benign sorbents with enhanced oil spill absorption performances.展开更多
Although ocean crude-oil spill accidents did not frequently happened in the past, it really caused great damage to the ma- rine ecosystem once it happened. Because of the spreading and weathering, crude-oil spill usua...Although ocean crude-oil spill accidents did not frequently happened in the past, it really caused great damage to the ma- rine ecosystem once it happened. Because of the spreading and weathering, crude-oil spill usually covers a large area of water surface and its viscosity is very high, which brings hu- man great trouble to clean it up. Dispersant and in-situ burn- ing were frequently used in the past crude-oil spill accidents, but these two methods suffered from the drawbacks includ- ing being toxic to marine lives, causing air pollution, disabil- ity of recovering the crude oil. Oil skimmers could recovery the oils, but their handling capacities are rather limited. Re- cently, porous hydrophobic and oleophilic materials （PHOM） have been demonstrated as low-cost, efficient and ecofriendly materials for the oil spill cleanup [ 1 ]. Nevertheless, their poor absorption speed to viscous oil spill hinders their practical ap- plication.展开更多
New powdered sorbent Lignosorb based on the hydrophobized hydrolysis lignin has been developed at the Belarusian State University. Hydrolysis lignin is a commercial waste product of biomass processing in the hydrolysi...New powdered sorbent Lignosorb based on the hydrophobized hydrolysis lignin has been developed at the Belarusian State University. Hydrolysis lignin is a commercial waste product of biomass processing in the hydrolysis production of ethanol. In spite of the various proposals for hydrolysis lignin usage, the wide application has not found yet. Special area of hydrophobized hydrolysis lignin usage as a sorbent for oil spills removal and oil products waste recovery is discussed. Lignosorb, thanks to the rather high bulk density, can be applied manually or mechanically by conventional sprayers. It does not sink after oil adsorption and transforms liquid oil film on the water surface into the solid mass. The solid product is a complete mass and is easily collected from the surface of water. Lignosorb when blended with oil products waste in the volume forms the granular free-running product. The rheological properties of the Lignosorb suspensions in oil products at different sorbent to oil product ratio have been estimated. Saturated by different oil products Lignosorb one can granulate or pellet and utilize as a composite solid fuel including the co-firing regime of combustion. It has the higher heating value of 32.1 - 38.8 MJ/kg while the coal has 20.9 - 30.1 MJ/kg. It has been shown that composite fuel burning has less longstanding inflammation stage, more long stable burning stage and less longstanding phase of smoldering in the comparison to wood and Lignosorb burning.展开更多
基金financially supported by the National Natural Science Foundation of China(22072185,21872176,21805315,and 12072381)the Pearl River Talents Program(2017GC010671)the Natural Science Foundation of Guangdong Province(2018A030310062 and 2019A1515012030)。
文摘Advances in the use of porous materials for oilwater separation offer a promising avenue for solving oil spill problems.Conventionally,to realize selective oil absorption,porous sorbents need to be fully hydrophobized with lowsurface-energy chemicals.However,such exhaustive hydrophobization brings about problems of excessive chemical consumption,high cost and increased environmental hazards,hindering the practical applications of sorbents.Here,an innovative type of oil sorbent is developed via a facile liquid film-based dip coating technique.Unlike conventional fullyhydrophobized sorbents,only the outmost layer of our sorbent is modified with hydrophobic polydimethylsiloxane(PDMS)coating while the inner part remains hydrophilic,thus achieving 80%reduction in low-surface-energy chemical consumption.The prepared sorbent allows highly selective oil absorption from oil-water mixture,as the hydrophobic skin layer blocks water entrance and the hydrophilic inner part drives oil absorption.More importantly,our sorbent significantly speeds up oil absorption,and compared with conventional hydrophobic sponges,the absorption time is reduced by 36%for absorption of the same mass of crude oil,attributed to the strong capillary absorption of its hydrophilic inner channels.This sorbent also shows larger specific absorption capacity than its fully hydrophobized counterpart.Our study provides a general strategy to develop cost-effective and environmental-benign sorbents with enhanced oil spill absorption performances.
文摘Although ocean crude-oil spill accidents did not frequently happened in the past, it really caused great damage to the ma- rine ecosystem once it happened. Because of the spreading and weathering, crude-oil spill usually covers a large area of water surface and its viscosity is very high, which brings hu- man great trouble to clean it up. Dispersant and in-situ burn- ing were frequently used in the past crude-oil spill accidents, but these two methods suffered from the drawbacks includ- ing being toxic to marine lives, causing air pollution, disabil- ity of recovering the crude oil. Oil skimmers could recovery the oils, but their handling capacities are rather limited. Re- cently, porous hydrophobic and oleophilic materials （PHOM） have been demonstrated as low-cost, efficient and ecofriendly materials for the oil spill cleanup [ 1 ]. Nevertheless, their poor absorption speed to viscous oil spill hinders their practical ap- plication.
文摘New powdered sorbent Lignosorb based on the hydrophobized hydrolysis lignin has been developed at the Belarusian State University. Hydrolysis lignin is a commercial waste product of biomass processing in the hydrolysis production of ethanol. In spite of the various proposals for hydrolysis lignin usage, the wide application has not found yet. Special area of hydrophobized hydrolysis lignin usage as a sorbent for oil spills removal and oil products waste recovery is discussed. Lignosorb, thanks to the rather high bulk density, can be applied manually or mechanically by conventional sprayers. It does not sink after oil adsorption and transforms liquid oil film on the water surface into the solid mass. The solid product is a complete mass and is easily collected from the surface of water. Lignosorb when blended with oil products waste in the volume forms the granular free-running product. The rheological properties of the Lignosorb suspensions in oil products at different sorbent to oil product ratio have been estimated. Saturated by different oil products Lignosorb one can granulate or pellet and utilize as a composite solid fuel including the co-firing regime of combustion. It has the higher heating value of 32.1 - 38.8 MJ/kg while the coal has 20.9 - 30.1 MJ/kg. It has been shown that composite fuel burning has less longstanding inflammation stage, more long stable burning stage and less longstanding phase of smoldering in the comparison to wood and Lignosorb burning.
