In this work,two kinds of primary batteries,both of which included a Zn anode,C rod cathode,copper wire and electrolyte composed of Cd^(2+)-contaminated water or soil,were constructed in the first attempt to both remo...In this work,two kinds of primary batteries,both of which included a Zn anode,C rod cathode,copper wire and electrolyte composed of Cd^(2+)-contaminated water or soil,were constructed in the first attempt to both remove Cd^(2+)and generate electricity.Unlike traditional technologies such as electrokinetic remediation with high energy consumption,this technology could realize Cd^(2+)migration to aggregation and solidification and generate energy at the same time through simultaneous galvanic reactions.The passive surface of Zn and C was proven via electrochemical measurements to be porous to maintain the relatively active galvanic reactions for continuous Cd^(2+)precipitation.Cd^(2+)RE(removal efficiency)and electricity generation were investigated under different conditions,based on which two empirical models were established to predict them successfully.In soil,KCl was added to desorb Cd^(2+)from soil colloids to promote Cd^(2+)removal.These systems were also proven to remove Cd^(2+)efficiently when their effects on plants,zebrafish,and the soil bacterial community were tested.LEDs could be lit for days by utilizing the electricity produced herein.This work provides a novel,green,and low-cost route to remediate Cd^(2+)contamination and generate electricity simultaneously,which is of extensive practical significance in the environmental and energy fields.展开更多
NaA zeolite(Si/Al=1.00)has been commercially applied for capturing radioactive 90Sr^(2+)because of its high surface charge density,effectively stabilizing the multivalent cation.However,owing to its narrow micropore o...NaA zeolite(Si/Al=1.00)has been commercially applied for capturing radioactive 90Sr^(2+)because of its high surface charge density,effectively stabilizing the multivalent cation.However,owing to its narrow micropore opening(4.0Å),large micron-sized crystallites,and bulkiness of hydrated Sr^(2+),the Sr^(2+)exchange over NaA has been limited by very slow kinetics.In this study,we synthesized nanocrystalline low-silica X by minimizing a water content in a synthesis gel and utilizing a methyl cellulose hydrogel as a crystal growth inhibitor.The resulting zeolite exhibited high crystallinity and Al-rich framework(Si/Al of approximately 1.00)with the sole presence of tetrahedral Al sites,which are capable of high Sr^(2+)uptake and ion selectivity.Meanwhile,the zeolite with a FAU topology has a much larger micropore opening size(7.4Å)and a much smaller crystallite size(~340 nm)than NaA,which enable significantly enhanced ion-exchange kinetics.Compared to conventional NaA,the nanocrystalline low-silica X exhibited remarkably increased Sr^(2+)-exchange kinetics(>18-fold larger rate constant)in batch experiments.Although both the nanocrystalline low-silica X and NaA exhibited comparable Sr^(2+)capacities under equilibrated conditions,the former demonstrated a 5.5-fold larger breakthrough volume than NaA under dynamic conditions,attributed to its significantly faster Sr^(2+)-exchange kinetics.展开更多
以筒状单室不锈钢电极微生物燃料电池（MFC）为对象,研究了去除其其中铅的可行性.结果表明,在批式条件下,当初始Pb2＋浓度为40 mg/L、pH为4.0时,Pb2＋去除速度和效率分别达0.53±0.06 mg/（L·h）和96.71%±1.35%,最终以碱...以筒状单室不锈钢电极微生物燃料电池（MFC）为对象,研究了去除其其中铅的可行性.结果表明,在批式条件下,当初始Pb2＋浓度为40 mg/L、pH为4.0时,Pb2＋去除速度和效率分别达0.53±0.06 mg/（L·h）和96.71%±1.35%,最终以碱式碳酸铅的形式回收Pb2＋.Pb2＋去除过程中首先在MFC作用下还原成单质铅,再因暴露在空气中转化为碱式碳酸铅,但该MFC的电化学性能相对较低,输出电压、功率密度和库仑效率只有30.62±1.04 m V,8.20±0.24 m W/m2和5.92%±0.21%.展开更多
基金the Plan of Anhui Major Provincial Science and Technology Project(202203a06020001)the University Synergy Innovation Program of Anhui Province(GXXT-2021-059)+4 种基金the National Natural Science Foundation of China(31771284,52000025)the Key R&D Program of Guangdong Province(2020B0202010005)the Fundamental Research Funds for the Central Universities(2232020D-22)the Key R&D Program of Inner Mongolia Autonomous Region(2021GG0300)the Open Research Fund of Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province and the Open Research Fund of Key Laboratory of High Magnetic Field and Ion Beam Physical Biology。
文摘In this work,two kinds of primary batteries,both of which included a Zn anode,C rod cathode,copper wire and electrolyte composed of Cd^(2+)-contaminated water or soil,were constructed in the first attempt to both remove Cd^(2+)and generate electricity.Unlike traditional technologies such as electrokinetic remediation with high energy consumption,this technology could realize Cd^(2+)migration to aggregation and solidification and generate energy at the same time through simultaneous galvanic reactions.The passive surface of Zn and C was proven via electrochemical measurements to be porous to maintain the relatively active galvanic reactions for continuous Cd^(2+)precipitation.Cd^(2+)RE(removal efficiency)and electricity generation were investigated under different conditions,based on which two empirical models were established to predict them successfully.In soil,KCl was added to desorb Cd^(2+)from soil colloids to promote Cd^(2+)removal.These systems were also proven to remove Cd^(2+)efficiently when their effects on plants,zebrafish,and the soil bacterial community were tested.LEDs could be lit for days by utilizing the electricity produced herein.This work provides a novel,green,and low-cost route to remediate Cd^(2+)contamination and generate electricity simultaneously,which is of extensive practical significance in the environmental and energy fields.
基金supported by the institute of Civil Miltary Technology cooperation funded by the Defense Acquisition Program Administration and Ministry of Trade,Industry and Energy of Korea Government under grant No.22-CM-BR-14.
文摘NaA zeolite(Si/Al=1.00)has been commercially applied for capturing radioactive 90Sr^(2+)because of its high surface charge density,effectively stabilizing the multivalent cation.However,owing to its narrow micropore opening(4.0Å),large micron-sized crystallites,and bulkiness of hydrated Sr^(2+),the Sr^(2+)exchange over NaA has been limited by very slow kinetics.In this study,we synthesized nanocrystalline low-silica X by minimizing a water content in a synthesis gel and utilizing a methyl cellulose hydrogel as a crystal growth inhibitor.The resulting zeolite exhibited high crystallinity and Al-rich framework(Si/Al of approximately 1.00)with the sole presence of tetrahedral Al sites,which are capable of high Sr^(2+)uptake and ion selectivity.Meanwhile,the zeolite with a FAU topology has a much larger micropore opening size(7.4Å)and a much smaller crystallite size(~340 nm)than NaA,which enable significantly enhanced ion-exchange kinetics.Compared to conventional NaA,the nanocrystalline low-silica X exhibited remarkably increased Sr^(2+)-exchange kinetics(>18-fold larger rate constant)in batch experiments.Although both the nanocrystalline low-silica X and NaA exhibited comparable Sr^(2+)capacities under equilibrated conditions,the former demonstrated a 5.5-fold larger breakthrough volume than NaA under dynamic conditions,attributed to its significantly faster Sr^(2+)-exchange kinetics.
文摘以筒状单室不锈钢电极微生物燃料电池（MFC）为对象,研究了去除其其中铅的可行性.结果表明,在批式条件下,当初始Pb2＋浓度为40 mg/L、pH为4.0时,Pb2＋去除速度和效率分别达0.53±0.06 mg/（L·h）和96.71%±1.35%,最终以碱式碳酸铅的形式回收Pb2＋.Pb2＋去除过程中首先在MFC作用下还原成单质铅,再因暴露在空气中转化为碱式碳酸铅,但该MFC的电化学性能相对较低,输出电压、功率密度和库仑效率只有30.62±1.04 m V,8.20±0.24 m W/m2和5.92%±0.21%.
