改性纳米TiO_(2)对污染土壤砷形态及土壤性质的影响  

EFFECT OF MODIFIED NANO-TIO_(2) ON ARSENIC SPECIES AND ENZYME ACTIVITY IN ARSENIC CONTAMINATED SOIL

作　　者：李海燕 强瑀 呼艳姣 刘静[2] 秦樊鑫 LI Haiyan;QIANG Yu;HU Yanjiao;LIU Jing;QIN Fanxin(Guizhou Provincial Key Laboratory for Information System of Mountainous Areas and Protection of Ecological Env ironment,Guizhou Normal University,Guiyang 550001,China;School of Life Sciences,Cuizhou Normal University,Guiyang 550025.China;Cuizhou Provincial Key Laboratory of Plant Physiology and Developmental Regulation,Guizhou Normal University,Guiyang 550025,China)

机构地区：[1]贵州师范大学贵州省山地环境信息系统与生态环境保护重点实验室,贵阳550001 [2]贵州师范大学生命科学学院,贵阳550025 [3]贵州师范大学贵州省植物生理与发育调控重点实验室,贵阳550025

出　　处：《环境工程》2022年第8期136-142,共7页Environmental Engineering

基　　金：国家自然科学基金(21467005)。

摘　　要：基于纳米TiO_(2)对土壤砷的稳定效果,以自制的改性纳米TiO_(2)(活性炭负载纳米二氧化钛TiO_(2)/AC和铁改性活性炭负载纳米二氧化钛Fe-TiO_(2)/AC)为试验材料,通过室内模拟试验,研究改性纳米TiO_(2)对土壤砷形态、土壤pH、土壤养分及土壤酶活性的影响。结果表明:在2种改性纳米TiO_(2)的作用下,土壤中砷活性较强的非专性和专性吸附态均降低,惰性的砷无定形和弱结晶水合铁铝氧化物结合态和残渣态均升高。土壤pH随改性纳米TiO_(2)施用量的增加而升高,速效钾含量均增加,而土壤有效氮减少。在TiO_(2)/AC和Fe-TiO_(2)/AC作用下,土壤pH分别为7.07~7.21、7.28~7.43。施加TiO_(2)/AC和Fe-TiO_(2)/AC,速效钾的增幅分别为17.2%~32.2%和28.7%~29.5%,有效氮含量降幅分别为25.1%~37.8%和23.5%~44.6%。2种改性纳米TiO_(2)对土壤中性、碱性磷酸酶的活性均有激活作用;TiO_(2)/AC对土壤过氧化氢酶和脲酶活性具有一定的抑制作用,但铁改性后的Fe-TiO_(2)/AC抑制作用减弱,且在施加量为0.3%土壤过氧化氢酶活性比对照提高了19.5%;施加TiO_(2)/AC后土壤脲酶活性下降范围为63.0%~76.6%,但在0.4%Fe-TiO_(2)/AC作用下,土壤脲酶活性较对照上升了5.8%。可见,改性纳米TiO_(2)可以使土壤中砷由活性态向惰性态转化,对土壤性质的影响可通过铁改性来进行控制。Based on the stabilizing effect of nano-TiO_(2)dioxide on soil arsenic, using self-made modified nano-TiO_(2)(TiO_(2)/AC and Fe-TiO_(2)/AC) as the test material, the effects of modified nano-TiO_(2)on the speciation of As, soil pH, nutrients and enzymatic activities were studied through indoor simulation experiments. The results showed that: with the action of TiO_(2)/AC and Fe-TiO_(2)/AC, the non-specific adsorption state and obligate adsorption state of arsenic with strong activity in soil decreased by 1.1%~6.3%, 1.8%~9.5% and 2.1%~6.9%, 10.1%~18%, respectively. While the bound and residual states of inert arsenic amorphous and weakly crystalline hydrated iron-aluminum oxides increased by 1.0%~14.8%, 2.2%~10.5% and 3.7%~16.9%, 6.5%~16.7%, respectively. With the action of TiO_(2)/AC and Fe-TiO_(2)/AC, the soil pH increased by 0.05~0.13 and 0.20~0.35, respectively. The increase rates of available potassium were 17.2%~32.2% and 28.7%~29.5%, and the decrease rates of available nitrogen content were 25.1%~37.8% and 23.5%~44.6%, respectively. Two kinds of modified nano-TiO_(2)all had activating effect on soil neutral and alkaline phosphatase activity. TiO_(2)/AC had an inhibiting effect on activity of urease and catalase, and after iron modification, its inhibiting effect tended to be weaker. The soil catalase activity increased by 19.5% compared with the control when the application amount was 0.3%;the soil urease activity decreased by 63.0%~76.6% after applying TiO_(2)/AC, but under the action of 0.4% Fe-TiO_(2)/AC, the soil urease activity decreased by 63.0%~76.6%. Urease activity increased by 5.8% compared with the control. In short, the modified nano-TiO_(2)transformed arsenic in soil from active states to inert states, and the influence on the soil properties could be controlled by iron modification.

关 键 词：纳米TiO_(2) 砷形态 土壤养分 土壤酶活性 

分 类 号：X53[环境科学与工程—环境工程] TB383.1[一般工业技术—材料科学与工程] TQ134.11[化学工程—无机化工]