Waste textiles（WTs） are the inevitable outcome of human activity and should be separated and recycled in view of sustainable development. In this work, WT was modified through grafting with acrylic acid（AA） via ra...Waste textiles（WTs） are the inevitable outcome of human activity and should be separated and recycled in view of sustainable development. In this work, WT was modified through grafting with acrylic acid（AA） via radical polymerization process using ceric ammonium nitrate（CAN） as an initiator and microwave and/or UV irradiation as energy supply. The acrylic acid-grafted waste textiles（WT-g-AA） thus obtained was then used as an adsorbent to remove Pb（Ⅱ） from Pb（Ⅱ）-containing wastewater. The effects of p H, initial concentrations of Pb（Ⅱ） and adsorbent dose were investigated, and around 95% Pb（Ⅱ） can be removed from the aqueous solution containing 10 mg/L at p H 6.0–8.0. The experimental adsorption isotherm data was fitted to the Langmuir model with maximum adsorption capacity of35.7 mg Pb/g WT-g-AA. The Pb-absorbed WT-g-AA was stripped using dilute nitric acid solution and the adsorption capacity of Pb-free material decreased from 95.4%（cycle 1） to91.1%（cycle 3）. It was considered that the WT-g-AA adsorption for Pb（Ⅱ） may be realized through the ion-exchange mechanism between ／COOH and Pb（Ⅱ）. The promising results manifested that WT-g-AA powder was an efficient, eco-friendly and reusable adsorbent for the removal of Pb（Ⅱ） from wastewater.展开更多
Landfilling remains the primary disposal method for fly ash produced from municipal solid waste incineration(MSWI)following stabilization/solidification.However,the increasing generation of stabilized fly ash(SFA)is a...Landfilling remains the primary disposal method for fly ash produced from municipal solid waste incineration(MSWI)following stabilization/solidification.However,the increasing generation of stabilized fly ash(SFA)is accelerating the depletion of landfill capacity.Furthermore,the small particle size and low bulk density of SFA present significant environmental risks during handling and transportation.To mitigate these issues,a cost-effective compaction method was introduced into the SFA disposal process.The results show that SFA from both grate furnaces and fluidized bed incinerators exhibited high porosity,loose structure,and irregular particle morphology,indicating substantial potential for compaction.Key parameters influencing compaction effectiveness included compaction pressure,holding duration,and moisture content,with optimal values identified as 100–200 MPa,20 s,and 10%–15%moisture,respectively,depending on the incinerator type.After compaction treatment,the density of SFA more than doubled,while its volume was reduced by over 60%,significantly increasing landfill capacity and enhancing the efficiency of SFA disposal.The compaction process was effectively modeled using the Huang Peiyun equation for gerate furnace ash and the Heckel equation for fluidized bed ash.Furthermore,the unconfined compressive strength and three-point bending strength of compacted SFA met the MU10 standard for lime-sand bricks,making the material suitable for transportation and disposal.Finally,the compaction-based disposal method for SFA demonstrated clear techno-economic advantages and significant potential for broader application in waste management strategies.展开更多
基金financially supported by the National Key Technologies R&D Program of China (No. 2014BAL02B05)the National Natural Science Foundation of China (No. 51678419)
文摘Waste textiles（WTs） are the inevitable outcome of human activity and should be separated and recycled in view of sustainable development. In this work, WT was modified through grafting with acrylic acid（AA） via radical polymerization process using ceric ammonium nitrate（CAN） as an initiator and microwave and/or UV irradiation as energy supply. The acrylic acid-grafted waste textiles（WT-g-AA） thus obtained was then used as an adsorbent to remove Pb（Ⅱ） from Pb（Ⅱ）-containing wastewater. The effects of p H, initial concentrations of Pb（Ⅱ） and adsorbent dose were investigated, and around 95% Pb（Ⅱ） can be removed from the aqueous solution containing 10 mg/L at p H 6.0–8.0. The experimental adsorption isotherm data was fitted to the Langmuir model with maximum adsorption capacity of35.7 mg Pb/g WT-g-AA. The Pb-absorbed WT-g-AA was stripped using dilute nitric acid solution and the adsorption capacity of Pb-free material decreased from 95.4%（cycle 1） to91.1%（cycle 3）. It was considered that the WT-g-AA adsorption for Pb（Ⅱ） may be realized through the ion-exchange mechanism between ／COOH and Pb（Ⅱ）. The promising results manifested that WT-g-AA powder was an efficient, eco-friendly and reusable adsorbent for the removal of Pb（Ⅱ） from wastewater.
基金supported by the National Natural Science Foundation of China(No.52100152)the Natural Science Foundation of Shenzhen Science and Technology Commission(China)(No.RCBS20210609103644013)+1 种基金the Stable Support Program of Shenzhen Colleges and Universities(China)(No.20220810172813001)The Foundation of the State Key Laboratory of Pollution Control and Resource Reuse Foundation(Tongji University,China)is also acknowledged(PCRRF20013).
文摘Landfilling remains the primary disposal method for fly ash produced from municipal solid waste incineration(MSWI)following stabilization/solidification.However,the increasing generation of stabilized fly ash(SFA)is accelerating the depletion of landfill capacity.Furthermore,the small particle size and low bulk density of SFA present significant environmental risks during handling and transportation.To mitigate these issues,a cost-effective compaction method was introduced into the SFA disposal process.The results show that SFA from both grate furnaces and fluidized bed incinerators exhibited high porosity,loose structure,and irregular particle morphology,indicating substantial potential for compaction.Key parameters influencing compaction effectiveness included compaction pressure,holding duration,and moisture content,with optimal values identified as 100–200 MPa,20 s,and 10%–15%moisture,respectively,depending on the incinerator type.After compaction treatment,the density of SFA more than doubled,while its volume was reduced by over 60%,significantly increasing landfill capacity and enhancing the efficiency of SFA disposal.The compaction process was effectively modeled using the Huang Peiyun equation for gerate furnace ash and the Heckel equation for fluidized bed ash.Furthermore,the unconfined compressive strength and three-point bending strength of compacted SFA met the MU10 standard for lime-sand bricks,making the material suitable for transportation and disposal.Finally,the compaction-based disposal method for SFA demonstrated clear techno-economic advantages and significant potential for broader application in waste management strategies.
