
關鍵詞:鉀摻雜生物炭;過硫酸鹽;催化;自由基;有機污染土壤 中圖分類號:X53 文獻標志碼:A 文章編號:2095-6819(2025)05-1185-11 doi:10.13254/j.jare.2024.0655
Potassium-doped biochar-catalyzed degradationof phenolic polltantsin soil by sodium persulfate: performance and activationmechanism
LIANG Gaolei1,MU Anyong 2,REN Gengbo 1, WEN Juan3,ZHOU Bin3, JIAO Yongjie3,MA Xiaodong1*
(1.SchoolofEergndEviomentalEngineringHebeiUnivesiyfThologanj3in;.eparntofQality SafetyandEnviroentalrotectio,PetoinaDgangOifeldCoanjin3O80hna;3ianjincadeofotal Sciences,Tianjin 300191,China)
Abstract:Thisstudyfocusedonheaplicatioofdvancedpersulfateoxidationtechologies(S-AOPs)toremediatesoilontaated with phenolic organic compounds. K+- doped biochar was used as a heterogeneous phase catalyst to activate persulfate,facilitating the degradationofphenolicpolutantsinsoil.Experimentalresultsshowedthatthedegradationeficiencyofphenolreached98.8%ata 5%K (20號 doping level,while undoped biochar activated persulfate resulted in only a 16.6 % degradation rate.Additionally, K+- doped biocharactivatedpersufateprovedectiveindegadingoerotaiantssuhs,4-ichloropolandspholAachevingeadatio rates of 92.6% and 95.4% ,respectively.Investigations involving free radical quenching experiments and probe molecular studies revealed that the introduction of K+ significantly enhanced the generation of sulfate radicals (SO
), hydroxyl radicals ( ?? OH),and singlet oxygen ( 1O2 ).Thisenhancementimprovedtheefectivenessofactivatedpersulfateindegradingphenolicpolltants.Thiswork providesnovel insightsand scientific foundations for utilizing PS-AOPs inremediation of organically contaminated soils.
Keywords :potassium-doped biochar; persulfate; catalysis; radical; organic-contaminated soil
酚類有機化合物(如苯酚、氯酚)作為常見的化工原料及副產物,廣泛應用于制藥、石油、涂料、造紙和農用化學品制造等行業,然而,這些化合物在生產、運輸和使用過程中常常被釋放到環境中,尤其是化工園區及其周邊土壤,在某些重污染區域,王壤中酚類化合物的含量可能達到數百甚至數千毫克每千克[-2]。這不僅危害土壤生態系統的健康,還對農作物、地下水質及人類健康構成嚴重威脅[3-4]。過硫酸鹽高級氧化法(PS-AOPs)因其強氧化活性,被認為是修復有機污染土壤的有效手段[5]。
PS-AOPs的關鍵在于過硫酸鹽(PS)的活化方法,其中催化活化法以其操作簡便、催化活性較高的優勢而備受關注。碳基催化劑,以其易制備、比表面積大、穩定性好、催化活性高的優勢,在催化PS、激活其氧化活性的研究領域引起了人們的極大興趣[]。其中生物炭催化劑,因制備來源廣泛,制備成本低,展現出良好的應用前景8。因單純的生物炭催化劑活化PS能力較弱,近年來,人們對活化PS生物炭催化劑的研究,主要聚焦于利用生物炭的大比表面積、良好的可修飾性和兼容性,設計制備陽離子摻雜的生物炭復合催化劑,以提升催化活化PS的氧化活性。低價態過渡金屬離子可作為電子供體,向PS提供電子,促使其0一0鍵斷裂,生成具有強氧化能力的自由基( SO4- ·和·OH),生物炭載體起到了改善金屬離子的分散性和穩定性的作用,可有效避免催化劑顆粒間的團聚。……