Silicon-iron modified biochar remediates cadmium and arsenic co-contaminated paddy soil by regulating cadmium and arsenic speciation.

ABSTRACT:

Introduction

Silicon-iron-modified biochars (SMBCs) were produced to remediate paddy soil contaminated with both cadmium (Cd) and arsenic (As). This study explored the effects of SMBCs on the transformation of Cd and As species in soil and the associated responses of functional genes to elucidate the remediation mechanisms.

Method

Three silicon-iron modified biochars were utilized. (i) Silicon dioxide magnetic biochar (SMBC1), (ii) Calcium silicate magnetic biochar (SMBC2), and (iii) Sodium silicate magnetic biochar (SMBC3) were applied to paddy soil.

Results and discussion

SMBCs increased the soil pH and the concentration of dissolved organic carbon (DOC) by 0.42-0.54 units and 6.6-16.39%, respectively. SMBC treatments reduced the bioavailable concentrations of Cd an

SUBMITTER: Chen Y 

PROVIDER: S-EPMC12041675 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature