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Preparation of layered double hydroxides using boron mud and red mud industrial wastes and adsorption mechanism to phosphate
Author(s) -
Hu Pan,
Zhang Yihe,
Lv Fengzhu,
Tong Wangshu,
Xin Hao,
Meng Zilin,
Wang Xinke,
Chu Paul K.
Publication year - 2017
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12212
Subject(s) - adsorption , phosphate , hydroxide , layered double hydroxides , chemistry , thermogravimetric analysis , boron , wastewater , red mud , zeta potential , differential thermal analysis , nuclear chemistry , inorganic chemistry , chemical engineering , materials science , waste management , organic chemistry , physics , optics , nanoparticle , diffraction , engineering
Abstract Phosphate removal was important for wastewater treatment, and adsorption was an efficient treatment process. In this study, the layered double hydroxide adsorbent (BR‐LDH), which was prepared under alkali conditions using industrial residues boron mud and red mud, was used to adsorb the phosphate. The prepared BR‐LDH was characterised by X‐ray diffraction, Scanning electron microscopy, Energy‐dispersive X‐ray spectroscopy, and Thermo‐gravimetric‐differential thermal analysis. Adsorption experiments were carried out as a function of dosage, contact time, temperature and initial pH of phosphate solution. The removal ratio of phosphate onto OBR‐LDH reached 93%. The adsorption data showed a good compliance with the pseudo‐second‐order kinetic model. In addition, the mineral composition, the functional groups, the valence of elements and zeta potentials of OBR‐LDH before and after adsorption were used to analyse the adsorption mechanism. The result of real wastewater suggested that OBR‐LDH was excellent adsorbent for phosphorus removal from actual wastewater.