EFFECT OF MODIFIED NANO-TIO<sub>2</sub> ON ARSENIC SPECIES AND ENZYME ACTIVITY IN ARSENIC CONTAMINATED SOIL

LI Haiyan; QIANG Yu; HU Yanjiao; LIU Jing; QIN Fanxin

doi:10.13205/j.hjgc.202208019

Volume 40 Issue 8

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(8): 136-142

LI Haiyan, QIANG Yu, HU Yanjiao, LIU Jing, QIN Fanxin. EFFECT OF MODIFIED NANO-TIO2 ON ARSENIC SPECIES AND ENZYME ACTIVITY IN ARSENIC CONTAMINATED SOIL[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 136-142. doi: 10.13205/j.hjgc.202208019

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LI Haiyan, QIANG Yu, HU Yanjiao, LIU Jing, QIN Fanxin. EFFECT OF MODIFIED NANO-TIO₂ ON ARSENIC SPECIES AND ENZYME ACTIVITY IN ARSENIC CONTAMINATED SOIL[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 136-142. doi: 10.13205/j.hjgc.202208019

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EFFECT OF MODIFIED NANO-TIO₂ ON ARSENIC SPECIES AND ENZYME ACTIVITY IN ARSENIC CONTAMINATED SOIL

doi: 10.13205/j.hjgc.202208019

LI Haiyan¹,
QIANG Yu¹,
HU Yanjiao²,
LIU Jing²,
QIN Fanxin^{2,3
,
,}

1. Guizhou Provincial Key Laboratory for Information System of Mountainous Areas and Protection of Ecological Environment, Guizhou Normal University, Guiyang 550001, China;
2. School of Life Sciences, Guizhou Normal University, Guiyang 550025, China;
3. Guizhou Provincial Key Laboratory of Plant Physiology and Developmental Regulation, Guizhou Normal University, Guiyang 550025, China

Received Date: 2021-07-13
Publish Date: 2022-11-08

Abstract

Abstract

Based on the stabilizing effect of nano-TiO₂ dioxide on soil arsenic, using self-made modified nano-TiO₂ (TiO₂/AC and Fe-TiO₂/AC) as the test material, the effects of modified nano-TiO₂ 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 TiO₂/AC and Fe-TiO₂/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 TiO₂/AC and Fe-TiO₂/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-TiO₂ all had activating effect on soil neutral and alkaline phosphatase activity. TiO₂/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 TiO₂/AC, but under the action of 0.4% Fe-TiO₂/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-TiO₂ transformed arsenic in soil from active states to inert states, and the influence on the soil properties could be controlled by iron modification.
- nano-TiO₂,
- arsenic speciation,
- soil nutrients,
- soil enzyme activity

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References(33)

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