磁性水热炭对水体中砷、氟的吸附特性
|
摘要
利用水热法合成磁性水热炭(m-HTC)吸附剂,经X-射线衍射仪(XRD)、Zeta电位分析仪对吸附剂进行表征,通过试验探究吸附剂对水体中砷、氟的吸附特性.结果表明:投加量为2 g·L~(-1)时,对砷、氟去除率达85%左右;去除率随pH变化而变化,随离子强度I_s,吸附质初始质量浓度C_0的增加而下降;不同温度下的等温线数据更符合Langmuir模型,温度升高有利于吸附,单独体系下砷、氟的最大吸附量q_m分别为26.06和15.64 mg·g~(-1),共存体系下对砷、氟的q_m分别为20.42和13.62 mg·g~(-1),砷、氟存在相互抑制的作用;动力学试验数据更符合准二级动力学方程,经5次循环,去除率下降,但从实际角度,具有可取性.
Magnetic hydrothermal carbon(m-HTC) was prepared by hydrothermal synthesis method and characterized by X-ray diffraction(XRD) and Zeta potential and molecular weight analyzer. The adsorption properties of m-HTC to arsenate and fluoride in water were investigated by experiments. The results show that the removal rate of arsenic and fluorine reaches about 85% when the dosage is 2 g·L~(-1). The removal rate is changed by pH and decreased with the increasing of I_s and C_0. The adsorption isotherms are well fitted by Langmuir model at different temperatures, and increasing temperature is favorable for adsorption. The maximum removal capacities of arsenic and fluoride are 26.06 mg·g~(-1) and 15.64 mg·g~(-1) under the single system with 20.42 mg·g~(-1) and 13.62 mg·g~(-1) under the coexistence system, respectively. Arsenic and fluorine inhibit each other in coexistent solutions. The pseudo-second-order model is the best for predicting the adsorption kinetics. After five times of recycles, the removal rate of arsenic and fluorine is decreased, while it has advantages from practicality.
Magnetic hydrothermal carbon(m-HTC) was prepared by hydrothermal synthesis method and characterized by X-ray diffraction(XRD) and Zeta potential and molecular weight analyzer. The adsorption properties of m-HTC to arsenate and fluoride in water were investigated by experiments. The results show that the removal rate of arsenic and fluorine reaches about 85% when the dosage is 2 g·L~(-1). The removal rate is changed by pH and decreased with the increasing of I_s and C_0. The adsorption isotherms are well fitted by Langmuir model at different temperatures, and increasing temperature is favorable for adsorption. The maximum removal capacities of arsenic and fluoride are 26.06 mg·g~(-1) and 15.64 mg·g~(-1) under the single system with 20.42 mg·g~(-1) and 13.62 mg·g~(-1) under the coexistence system, respectively. Arsenic and fluorine inhibit each other in coexistent solutions. The pseudo-second-order model is the best for predicting the adsorption kinetics. After five times of recycles, the removal rate of arsenic and fluorine is decreased, while it has advantages from practicality.
引文
[1]GAO P P,TIAN X K,YANG C,et al.Fabrication,performance and mechanism of MgO meso-/macropous nanostructure for simultaneous removal of As(III)and Fin a groundwater system[J].Environmental Science Nano,doi:10.1039/C6EN00400H.
[2]NAUTIYAL B P,TIWARI D,CHOI S I,et al.Silane grafted chitosan for the efficient remediation of aquatic environment contaminated with arsenic(V)[J].Journal of Colloid&Interface Science,2016,467:203-212.
[3]BIBI S,FAROOQI A,HUSSAIN K,et al.Evaluation of industrial based adsorbents for simultaneous removal of arsenic and fluoride from drinking water[J].Journal of Cleaner Production,2015,87(1):882-896.
[4]QIAO J L,CUI Z M,SUN Y K,et al.Simultaneous removal of arsenate and fluoride from water by Al-Fe(hydr)oxides[J].Frontiers of Environmental Science&Engineering,2014,8(2):169-179.
[5]HAN C Y,LIU H,CHEN H R,et al.Adsorption performance and mechanism of As(V)uptake over mesoporous Y-Al binary oxide[J].Journal of the Taiwan Institute of Chemical Engineers,2016,65:204-211.
[6]徐伟,李长海,贾冬梅.一种新型复合除砷材料的制备及其性能[J].环境工程学报,2013,7(5):1611-1615.XU W,LI C H,JIA D M.Preparation and performance of a new composite material for removal arsenic[J].Chinese Journal of Environmental Engineering,2013,7(5):1611-1615.(in Chinese)
[7]ZHAO D D,YU Y,CHEN J P.Zirconium/polyvinyl alcohol modified flat-sheet polyvinyldene fluoride membrane for decontamination of arsenic:material design and optimization,study of mechanisms,and application prospects[J].Chemosphere,2016,155:630-639.
[8]赵江涛,周金龙.我国饮用水除砷氟技术研究现状[J].地下水,2015(1):85-87.ZHAO J T,ZHOU J L.Research status of arsenic fluoride removal from drinking water in China[J].Groud Water,2015(1):85-87.(in Chinese)
[9]周绍辉.Ti O2制备条件的优化及Ti O2-La砷氟共除性能研究[D].济南:山东建筑大学,2017.
[10]ZHU X D,LIU Y C,ZHOU C,et al.Novel and highperformance magnetic carbon composite prepared from waste hydrochar for dye removal[J].Acs Sustainable Chemistry&Engineering,2016,2(4):969-977.
[11]ISLAM M A,TAN I A W,BENHOURIA A,et al.Mesoporous and adsorptive properties of palm date seed activated carbon prepared via sequential hydrothermal carbonization and sodium hydroxide activation[J].Chemical Engineering Journal,2015,270(11):187-195.
[12]HASSAN A F,ABDELMOHSEN A M,ELHADIDY H.Adsorption of arsenic by activated carbon,calcium alginate and their composite beads[J].International Journal of Biological Macromolecules,2014,68(7):125-130.
[13]ASERE T G,MINCKE S,CLERCQ J D,et al.Removal of arsenic(V)from aqueous solutions using chitosanred scoria and chitosanpumice blends[J].International Journal of Environmental Research&Public Health,2017,14(8):895.
[14]BRAHMAN K D,KAZI T G,BAIG J A,et al.Biosorptive removal of inorganic arsenic species and fluoride from aqueous medium by the stem of Tecomella undulate[J].Chemosphere,2016,150:320-328.
[15]SUN K J,TANG J C,GONG Y Y,et al.Characterization of potassium hydroxide(KOH)modified hydrochars from different feedstocks for enhanced removal of heavy metals from water[J].Environmental Science&Pollution Research,2015,22(21):16640-16651.
[16]QIAN W,ZHAO A Z,XU R K.Sorption of As(V)by aluminum-modified crop straw-derived biochars[J].Water Air&Soil Pollution,2013,224(7):1610-1614.
[17]吴志坚,刘海宁,张慧芳.离子强度对吸附影响机理的研究进展[J].环境化学,2010,29(6):997-1003.WU Z J,LIU H N,ZHANG H F.Resarch progress on mechanisms about the effect of ionic strength on adsorption[J].Environmental Chemistry,2010,29(6):997-1003.(in Chinese)
[18]GOLDBERG S.Inconsistency in the triple layer model description of ionic strength dependent boron adsorption[J].Journal of Colloid&Interface Science,2005,285(2):509-517.
[19]WANG J,CHEN Z S,CHEN W Y,et al.Effect of p H,ionic strength,humic substances and temperature on the sorption of Th(IV)onto NKF-6 zeolite[J].Journal of Radioanalytical&Nuclear Chemistry,2016,310(2):597-609.
[20]OCISKI D,JACUKOWICZ-SOBALA I,KOCIOEK-BALAWEJDER E.Alginate beads containing water treatment residuals for arsenic removal from waterformation and adsorption studies[J].Environmental Science&Pollution Research International,2016,23(24):1-13.
[21]PETROVI? J T,STOJANOVI?M D,MILOJKOVI?J V,et al.Alkali modified hydrochar of grape pomace as a perspective adsorbent of Pb(2+)from aqueous solution[J].Journal of Environmental Management,2016,182:292-300.
[22]LIU Y,FAN Q,WANG S,et al.Adsorptive removal of fluoride from aqueous solutions using Al-humic acid-La aerogel composites[J].Chemical Engineering Journal,2016,306:174-185.
[2]NAUTIYAL B P,TIWARI D,CHOI S I,et al.Silane grafted chitosan for the efficient remediation of aquatic environment contaminated with arsenic(V)[J].Journal of Colloid&Interface Science,2016,467:203-212.
[3]BIBI S,FAROOQI A,HUSSAIN K,et al.Evaluation of industrial based adsorbents for simultaneous removal of arsenic and fluoride from drinking water[J].Journal of Cleaner Production,2015,87(1):882-896.
[4]QIAO J L,CUI Z M,SUN Y K,et al.Simultaneous removal of arsenate and fluoride from water by Al-Fe(hydr)oxides[J].Frontiers of Environmental Science&Engineering,2014,8(2):169-179.
[5]HAN C Y,LIU H,CHEN H R,et al.Adsorption performance and mechanism of As(V)uptake over mesoporous Y-Al binary oxide[J].Journal of the Taiwan Institute of Chemical Engineers,2016,65:204-211.
[6]徐伟,李长海,贾冬梅.一种新型复合除砷材料的制备及其性能[J].环境工程学报,2013,7(5):1611-1615.XU W,LI C H,JIA D M.Preparation and performance of a new composite material for removal arsenic[J].Chinese Journal of Environmental Engineering,2013,7(5):1611-1615.(in Chinese)
[7]ZHAO D D,YU Y,CHEN J P.Zirconium/polyvinyl alcohol modified flat-sheet polyvinyldene fluoride membrane for decontamination of arsenic:material design and optimization,study of mechanisms,and application prospects[J].Chemosphere,2016,155:630-639.
[8]赵江涛,周金龙.我国饮用水除砷氟技术研究现状[J].地下水,2015(1):85-87.ZHAO J T,ZHOU J L.Research status of arsenic fluoride removal from drinking water in China[J].Groud Water,2015(1):85-87.(in Chinese)
[9]周绍辉.Ti O2制备条件的优化及Ti O2-La砷氟共除性能研究[D].济南:山东建筑大学,2017.
[10]ZHU X D,LIU Y C,ZHOU C,et al.Novel and highperformance magnetic carbon composite prepared from waste hydrochar for dye removal[J].Acs Sustainable Chemistry&Engineering,2016,2(4):969-977.
[11]ISLAM M A,TAN I A W,BENHOURIA A,et al.Mesoporous and adsorptive properties of palm date seed activated carbon prepared via sequential hydrothermal carbonization and sodium hydroxide activation[J].Chemical Engineering Journal,2015,270(11):187-195.
[12]HASSAN A F,ABDELMOHSEN A M,ELHADIDY H.Adsorption of arsenic by activated carbon,calcium alginate and their composite beads[J].International Journal of Biological Macromolecules,2014,68(7):125-130.
[13]ASERE T G,MINCKE S,CLERCQ J D,et al.Removal of arsenic(V)from aqueous solutions using chitosanred scoria and chitosanpumice blends[J].International Journal of Environmental Research&Public Health,2017,14(8):895.
[14]BRAHMAN K D,KAZI T G,BAIG J A,et al.Biosorptive removal of inorganic arsenic species and fluoride from aqueous medium by the stem of Tecomella undulate[J].Chemosphere,2016,150:320-328.
[15]SUN K J,TANG J C,GONG Y Y,et al.Characterization of potassium hydroxide(KOH)modified hydrochars from different feedstocks for enhanced removal of heavy metals from water[J].Environmental Science&Pollution Research,2015,22(21):16640-16651.
[16]QIAN W,ZHAO A Z,XU R K.Sorption of As(V)by aluminum-modified crop straw-derived biochars[J].Water Air&Soil Pollution,2013,224(7):1610-1614.
[17]吴志坚,刘海宁,张慧芳.离子强度对吸附影响机理的研究进展[J].环境化学,2010,29(6):997-1003.WU Z J,LIU H N,ZHANG H F.Resarch progress on mechanisms about the effect of ionic strength on adsorption[J].Environmental Chemistry,2010,29(6):997-1003.(in Chinese)
[18]GOLDBERG S.Inconsistency in the triple layer model description of ionic strength dependent boron adsorption[J].Journal of Colloid&Interface Science,2005,285(2):509-517.
[19]WANG J,CHEN Z S,CHEN W Y,et al.Effect of p H,ionic strength,humic substances and temperature on the sorption of Th(IV)onto NKF-6 zeolite[J].Journal of Radioanalytical&Nuclear Chemistry,2016,310(2):597-609.
[20]OCISKI D,JACUKOWICZ-SOBALA I,KOCIOEK-BALAWEJDER E.Alginate beads containing water treatment residuals for arsenic removal from waterformation and adsorption studies[J].Environmental Science&Pollution Research International,2016,23(24):1-13.
[21]PETROVI? J T,STOJANOVI?M D,MILOJKOVI?J V,et al.Alkali modified hydrochar of grape pomace as a perspective adsorbent of Pb(2+)from aqueous solution[J].Journal of Environmental Management,2016,182:292-300.
[22]LIU Y,FAN Q,WANG S,et al.Adsorptive removal of fluoride from aqueous solutions using Al-humic acid-La aerogel composites[J].Chemical Engineering Journal,2016,306:174-185.