Facile and environmentally sustainable synthesis of bone waste derived biochar-based bimetallic-LDH nanocomposite for selected dyes removal from aqueous medium  

作　　者：Shanthi Prabha Viswanathan Giya Merline Kuriakose Gopika Vijayakumar Njazhakunnathu Sreekanth Prakasan Neelamury Thomas Paili Ambatt 

机构地区：[1]Advanced Centre of Environmental Studies and Sustainable Development(ACESSD),Mahatma Gandhi University,Kottayam,686560,Kerala,India

出　　处：《Waste Disposal and Sustainable Energy》2024年第3期355-369,共15页废弃物处置与可持续能源（英文）

摘　　要：The disposal of bone waste can be effectively addressed utilizing a novel approach involving the synthesis of a bovine bone-derived biochar-based Mg/Al-layered double hydroxide(LDH)nanocomposite(B-Mg/Al-NC).This nanocomposite exhibits exceptional capabilities for removing specific dyes,such as Methylene Blue(MB)and Congo Red(CR),from aqueous media.Extensive characterization using techniques confirmed the successful formation of the B-Mg/Al-NC,which possesses a high surface area,high porosity,and abundant functional groups.The Langmuir monolayer biosorption capacity was 395.56 mg g^(-1) and 328.25 mg g^(-1) at 50℃ for MB and CR,respectively,with rapid dye removal achieved within 25 min under alkaline pH conditions.The experimental data fit well with the pseudo-second-order kinetics model for both dyes.The remarkable dye adsorption capacity of the B-Mg/Al-NC can be attributed to the combined basic properties of the bone biochar and Mg/Al-LDH.Proposed mechanisms for enhanced dye removal include hydrogen bonding interactions,anion exchange,surface complexation,electrostatic interactions,and pore filling.Furthermore,the nanocomposite exhibited excellent reusability.In addition to its dye removal capabilities,the B-Mg/Al-NC was found to have a positive effect on seed germination and growth and salient soil health parameters,as demonstrated by a rapid seed germination test using the spent composite.Overall,the facile synthesis of the B-Mg/Al-NC via co-precipitation and ultrasonication is a highly recommended and sustainable approach for producing an eco-friendly bio-sorbent with exceptional dye removal efficiency from wastewater while also addressing the issue of bone waste disposal.

关 键 词：Bone waste BIOCHAR Double-layer hydroxide DYES Adsorption ECO-FRIENDLY Environment sustainability 

分 类 号：X703[环境科学与工程—环境工程] TB383[一般工业技术—材料科学与工程]